esgr-20210331
Enstar Group LTDD0truefalse00013638292021Q1FALSE--12-3112,31527,76300013638292021-01-012021-03-310001363829us-gaap:CommonStockMember2021-01-012021-03-310001363829us-gaap:SeriesDPreferredStockMember2021-01-012021-03-310001363829us-gaap:SeriesEPreferredStockMember2021-01-012021-03-31xbrli:shares0001363829esgr:VotingCommonStockMember2021-05-050001363829us-gaap:NonvotingCommonStockMember2021-05-05iso4217:USD0001363829us-gaap:ShortTermInvestmentsMember2021-03-310001363829us-gaap:ShortTermInvestmentsMember2020-12-310001363829us-gaap:FixedMaturitiesMember2021-03-310001363829us-gaap:FixedMaturitiesMember2020-12-3100013638292021-03-3100013638292020-12-31iso4217:USDxbrli:shares0001363829esgr:VotingCommonStockMember2021-03-310001363829esgr:VotingCommonStockMember2020-12-310001363829us-gaap:CommonClassCMember2021-03-310001363829us-gaap:CommonClassCMember2020-12-310001363829esgr:CommonClassEMember2020-12-310001363829esgr:CommonClassEMember2021-03-310001363829us-gaap:SeriesCPreferredStockMember2021-03-310001363829us-gaap:SeriesCPreferredStockMember2020-12-310001363829us-gaap:SeriesDPreferredStockMember2021-03-310001363829us-gaap:SeriesDPreferredStockMember2020-12-310001363829us-gaap:SeriesEPreferredStockMember2020-12-310001363829us-gaap:SeriesEPreferredStockMember2021-03-3100013638292020-01-012020-03-310001363829us-gaap:CommonStockMemberesgr:VotingCommonStockMember2020-12-310001363829us-gaap:CommonStockMemberesgr:VotingCommonStockMember2019-12-310001363829us-gaap:CommonStockMemberesgr:VotingCommonStockMember2021-01-012021-03-310001363829us-gaap:CommonStockMemberesgr:VotingCommonStockMember2020-01-012020-03-310001363829us-gaap:CommonStockMemberesgr:VotingCommonStockMember2021-03-310001363829us-gaap:CommonStockMemberesgr:VotingCommonStockMember2020-03-310001363829us-gaap:CommonStockMemberus-gaap:CommonClassCMember2020-12-310001363829us-gaap:CommonStockMemberus-gaap:CommonClassCMember2019-12-310001363829us-gaap:CommonStockMemberus-gaap:CommonClassCMember2021-01-012021-03-310001363829us-gaap:CommonStockMemberus-gaap:CommonClassCMember2020-01-012020-03-310001363829us-gaap:CommonStockMemberus-gaap:CommonClassCMember2021-03-310001363829us-gaap:CommonStockMemberus-gaap:CommonClassCMember2020-03-310001363829us-gaap:CommonStockMemberesgr:CommonClassEMember2020-12-310001363829us-gaap:CommonStockMemberesgr:CommonClassEMember2021-03-310001363829us-gaap:CommonStockMemberesgr:CommonClassEMember2020-03-310001363829us-gaap:CommonStockMemberesgr:CommonClassEMember2019-12-310001363829us-gaap:PreferredStockMemberus-gaap:SeriesCPreferredStockMember2020-12-310001363829us-gaap:PreferredStockMemberus-gaap:SeriesCPreferredStockMember2021-03-310001363829us-gaap:PreferredStockMemberus-gaap:SeriesCPreferredStockMember2020-03-310001363829us-gaap:PreferredStockMemberus-gaap:SeriesCPreferredStockMember2019-12-310001363829us-gaap:SeriesDPreferredStockMemberus-gaap:PreferredStockMember2020-12-310001363829us-gaap:SeriesDPreferredStockMemberus-gaap:PreferredStockMember2021-03-310001363829us-gaap:SeriesDPreferredStockMemberus-gaap:PreferredStockMember2020-03-310001363829us-gaap:SeriesDPreferredStockMemberus-gaap:PreferredStockMember2019-12-310001363829us-gaap:SeriesEPreferredStockMemberus-gaap:PreferredStockMember2021-03-310001363829us-gaap:SeriesEPreferredStockMemberus-gaap:PreferredStockMember2020-12-310001363829us-gaap:SeriesEPreferredStockMemberus-gaap:PreferredStockMember2019-12-310001363829us-gaap:SeriesEPreferredStockMemberus-gaap:PreferredStockMember2020-03-310001363829us-gaap:TreasuryStockMember2021-03-310001363829us-gaap:TreasuryStockMember2020-12-310001363829us-gaap:TreasuryStockMember2019-12-310001363829us-gaap:TreasuryStockMember2020-03-310001363829esgr:JointOwnershipPlanVotingOrdinarySharesMember2020-12-310001363829esgr:JointOwnershipPlanVotingOrdinarySharesMember2019-12-310001363829esgr:JointOwnershipPlanVotingOrdinarySharesMember2021-01-012021-03-310001363829esgr:JointOwnershipPlanVotingOrdinarySharesMember2020-01-012020-03-310001363829esgr:JointOwnershipPlanVotingOrdinarySharesMember2021-03-310001363829esgr:JointOwnershipPlanVotingOrdinarySharesMember2020-03-310001363829us-gaap:AdditionalPaidInCapitalMember2020-12-310001363829us-gaap:AdditionalPaidInCapitalMember2019-12-310001363829us-gaap:AdditionalPaidInCapitalMemberesgr:VotingCommonStockMember2021-01-012021-03-310001363829us-gaap:AdditionalPaidInCapitalMemberesgr:VotingCommonStockMember2020-01-012020-03-310001363829us-gaap:AdditionalPaidInCapitalMember2021-01-012021-03-310001363829us-gaap:AdditionalPaidInCapitalMember2020-01-012020-03-310001363829us-gaap:AdditionalPaidInCapitalMember2021-03-310001363829us-gaap:AdditionalPaidInCapitalMember2020-03-310001363829us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-12-310001363829us-gaap:AccumulatedOtherComprehensiveIncomeMember2019-12-310001363829us-gaap:AccumulatedTranslationAdjustmentMember2020-12-310001363829us-gaap:AccumulatedTranslationAdjustmentMember2019-12-310001363829us-gaap:AccumulatedTranslationAdjustmentMember2021-01-012021-03-310001363829us-gaap:AccumulatedTranslationAdjustmentMember2020-01-012020-03-310001363829us-gaap:AccumulatedTranslationAdjustmentMember2021-03-310001363829us-gaap:AccumulatedTranslationAdjustmentMember2020-03-310001363829us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2021-03-310001363829us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2020-12-310001363829us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2020-03-310001363829us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2019-12-310001363829us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2020-12-310001363829us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2019-12-310001363829us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2021-01-012021-03-310001363829us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2020-01-012020-03-310001363829us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2021-03-310001363829us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2020-03-310001363829us-gaap:AccumulatedOtherComprehensiveIncomeMember2021-03-310001363829us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-03-310001363829us-gaap:RetainedEarningsMember2020-12-310001363829us-gaap:RetainedEarningsMember2019-12-310001363829us-gaap:RetainedEarningsMember2021-01-012021-03-310001363829us-gaap:RetainedEarningsMember2020-01-012020-03-310001363829us-gaap:RetainedEarningsMembersrt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2020-12-310001363829us-gaap:RetainedEarningsMembersrt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2019-12-310001363829us-gaap:RetainedEarningsMember2021-03-310001363829us-gaap:RetainedEarningsMember2020-03-310001363829us-gaap:NoncontrollingInterestMember2020-12-310001363829us-gaap:NoncontrollingInterestMember2019-12-310001363829us-gaap:NoncontrollingInterestMember2021-01-012021-03-310001363829us-gaap:NoncontrollingInterestMember2020-01-012020-03-310001363829us-gaap:NoncontrollingInterestMember2021-03-310001363829us-gaap:NoncontrollingInterestMember2020-03-3100013638292020-03-3100013638292019-12-310001363829esgr:CNAMember2021-02-052021-02-050001363829esgr:CNAMember2021-02-050001363829esgr:LibertyMutualMember2021-01-082021-01-080001363829esgr:LibertyMutualMember2021-01-080001363829esgr:HanoverReMember2020-08-062020-08-060001363829esgr:MunichReMember2020-07-012020-07-010001363829esgr:AXAGroupMember2020-06-012020-06-010001363829esgr:AspenMember2020-06-012020-06-010001363829esgr:AspenMember2020-06-010001363829esgr:LyftMember2020-03-312020-03-310001363829us-gaap:SubsequentEventMemberesgr:AXAGroupMember2021-05-032021-05-030001363829esgr:ProSightMember2021-01-152021-01-15xbrli:pure0001363829esgr:AXAGroupMember2020-10-012020-10-010001363829esgr:NorthBayMember2020-12-310001363829esgr:NorthBayMemberesgr:TridentMember2020-12-310001363829esgr:NorthBayMemberesgr:DowlingMember2020-12-310001363829esgr:NorthBayMemberesgr:StarStoneSpecialtyHoldingsLimitedMember2020-12-310001363829esgr:NorthshoreHoldingsLimitedMemberesgr:NorthBayMember2020-12-310001363829esgr:CoreSpecialtyMember2021-01-010001363829esgr:CoreSpecialtyMemberesgr:NorthshoreHoldingsLimitedMember2021-01-010001363829esgr:NorthshoreHoldingsLimitedMemberesgr:TridentMember2021-01-010001363829esgr:CoreSpecialtyMemberesgr:DowlingMember2021-01-010001363829esgr:NorthshoreHoldingsLimitedMemberesgr:DowlingMember2021-01-010001363829esgr:StarStoneSpecialtyHoldingsLimitedMember2021-03-310001363829esgr:StarStoneSpecialtyHoldingsLimitedMemberesgr:TridentMember2021-03-310001363829esgr:StarStoneSpecialtyHoldingsLimitedMemberesgr:DowlingMember2021-03-310001363829esgr:NorthshoreHoldingsLimitedMember2021-03-310001363829us-gaap:DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMemberesgr:NorthshoreHoldingsLimitedMember2021-01-012021-03-310001363829esgr:RunOffMember2020-01-012020-12-310001363829esgr:NorthshoreHoldingsLimitedMemberus-gaap:ShortTermInvestmentsMemberus-gaap:DisposalGroupHeldForSaleOrDisposedOfBySaleNotDiscontinuedOperationsMember2020-12-310001363829esgr:NorthshoreHoldingsLimitedMemberus-gaap:DisposalGroupHeldForSaleOrDisposedOfBySaleNotDiscontinuedOperationsMemberus-gaap:FixedMaturitiesMember2020-12-310001363829esgr:NorthshoreHoldingsLimitedMemberus-gaap:DisposalGroupHeldForSaleOrDisposedOfBySaleNotDiscontinuedOperationsMember2020-12-310001363829esgr:StarStoneUSMemberus-gaap:DiscontinuedOperationsDisposedOfBySaleMember2020-11-300001363829esgr:CoreSpecialtyMember2020-11-300001363829esgr:StarStoneUSMemberus-gaap:DiscontinuedOperationsDisposedOfBySaleMember2020-01-012020-03-310001363829esgr:StarStoneUSMember2020-11-302020-11-300001363829esgr:StarStoneUSMemberus-gaap:DiscontinuedOperationsDisposedOfBySaleMember2021-01-012021-03-310001363829esgr:CoreSpecialtyMember2021-03-310001363829esgr:CoreSpecialtyMember2020-12-3100013638292021-01-012021-01-010001363829esgr:CoreSpecialtyMember2021-01-012021-03-310001363829esgr:StarStoneUSMember2021-03-310001363829esgr:StarStoneUnderwritingLImitedMemberesgr:TridentMember2021-03-310001363829esgr:StarStoneUnderwritingLImitedMemberesgr:DowlingMember2021-03-310001363829us-gaap:DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMemberesgr:StarStoneUnderwritingLImitedMember2021-03-152021-03-150001363829us-gaap:DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMemberesgr:StarStoneUnderwritingLImitedMember2021-01-012021-03-3100013638292021-03-152021-03-150001363829esgr:TridentMember2021-03-152021-03-150001363829esgr:InigoMember2021-03-310001363829esgr:InigoMember2020-12-310001363829esgr:InigoMember2021-03-310001363829us-gaap:DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMemberesgr:ArenaNVMember2021-02-112021-02-110001363829us-gaap:DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMemberesgr:ArenaNVMember2021-01-012021-03-310001363829us-gaap:DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMemberesgr:AtriumUnderwritingGroupLimitedMember2021-01-012021-03-310001363829us-gaap:ShortTermInvestmentsMemberus-gaap:USGovernmentAgenciesDebtSecuritiesMember2021-03-310001363829us-gaap:USGovernmentAgenciesDebtSecuritiesMemberus-gaap:FixedMaturitiesMember2021-03-310001363829esgr:FundsHeldDirectlyManagedMemberus-gaap:USGovernmentAgenciesDebtSecuritiesMember2021-03-310001363829us-gaap:USGovernmentAgenciesDebtSecuritiesMember2021-03-310001363829us-gaap:ShortTermInvestmentsMemberesgr:UnitedKingdomGovernmentAgenciesDebtSecuritiesMember2021-03-310001363829esgr:UnitedKingdomGovernmentAgenciesDebtSecuritiesMemberus-gaap:FixedMaturitiesMember2021-03-310001363829esgr:FundsHeldDirectlyManagedMemberesgr:UnitedKingdomGovernmentAgenciesDebtSecuritiesMember2021-03-310001363829esgr:UnitedKingdomGovernmentAgenciesDebtSecuritiesMember2021-03-310001363829us-gaap:ShortTermInvestmentsMemberesgr:OtherGovernmentAgenciesDebtSecuritiesMember2021-03-310001363829esgr:OtherGovernmentAgenciesDebtSecuritiesMemberus-gaap:FixedMaturitiesMember2021-03-310001363829esgr:FundsHeldDirectlyManagedMemberesgr:OtherGovernmentAgenciesDebtSecuritiesMember2021-03-310001363829esgr:OtherGovernmentAgenciesDebtSecuritiesMember2021-03-310001363829us-gaap:CorporateDebtSecuritiesMemberus-gaap:ShortTermInvestmentsMember2021-03-310001363829us-gaap:CorporateDebtSecuritiesMemberus-gaap:FixedMaturitiesMember2021-03-310001363829us-gaap:CorporateDebtSecuritiesMemberesgr:FundsHeldDirectlyManagedMember2021-03-310001363829us-gaap:CorporateDebtSecuritiesMember2021-03-310001363829us-gaap:ShortTermInvestmentsMemberus-gaap:MunicipalBondsMember2021-03-310001363829us-gaap:MunicipalBondsMemberus-gaap:FixedMaturitiesMember2021-03-310001363829us-gaap:MunicipalBondsMemberesgr:FundsHeldDirectlyManagedMember2021-03-310001363829us-gaap:MunicipalBondsMember2021-03-310001363829us-gaap:ResidentialMortgageBackedSecuritiesMemberus-gaap:ShortTermInvestmentsMember2021-03-310001363829us-gaap:ResidentialMortgageBackedSecuritiesMemberus-gaap:FixedMaturitiesMember2021-03-310001363829us-gaap:ResidentialMortgageBackedSecuritiesMemberesgr:FundsHeldDirectlyManagedMember2021-03-310001363829us-gaap:ResidentialMortgageBackedSecuritiesMember2021-03-310001363829us-gaap:CommercialMortgageBackedSecuritiesMemberus-gaap:ShortTermInvestmentsMember2021-03-310001363829us-gaap:CommercialMortgageBackedSecuritiesMemberus-gaap:FixedMaturitiesMember2021-03-310001363829us-gaap:CommercialMortgageBackedSecuritiesMemberesgr:FundsHeldDirectlyManagedMember2021-03-310001363829us-gaap:CommercialMortgageBackedSecuritiesMember2021-03-310001363829us-gaap:AssetBackedSecuritiesMemberus-gaap:ShortTermInvestmentsMember2021-03-310001363829us-gaap:AssetBackedSecuritiesMemberus-gaap:FixedMaturitiesMember2021-03-310001363829us-gaap:AssetBackedSecuritiesMemberesgr:FundsHeldDirectlyManagedMember2021-03-310001363829us-gaap:AssetBackedSecuritiesMember2021-03-310001363829esgr:FundsHeldDirectlyManagedMember2021-03-310001363829us-gaap:ShortTermInvestmentsMemberus-gaap:USGovernmentAgenciesDebtSecuritiesMember2020-12-310001363829us-gaap:USGovernmentAgenciesDebtSecuritiesMemberus-gaap:FixedMaturitiesMember2020-12-310001363829esgr:FundsHeldDirectlyManagedMemberus-gaap:USGovernmentAgenciesDebtSecuritiesMember2020-12-310001363829us-gaap:USGovernmentAgenciesDebtSecuritiesMember2020-12-310001363829us-gaap:ShortTermInvestmentsMemberesgr:UnitedKingdomGovernmentAgenciesDebtSecuritiesMember2020-12-310001363829esgr:UnitedKingdomGovernmentAgenciesDebtSecuritiesMemberus-gaap:FixedMaturitiesMember2020-12-310001363829esgr:FundsHeldDirectlyManagedMemberesgr:UnitedKingdomGovernmentAgenciesDebtSecuritiesMember2020-12-310001363829esgr:UnitedKingdomGovernmentAgenciesDebtSecuritiesMember2020-12-310001363829us-gaap:ShortTermInvestmentsMemberesgr:OtherGovernmentAgenciesDebtSecuritiesMember2020-12-310001363829esgr:OtherGovernmentAgenciesDebtSecuritiesMemberus-gaap:FixedMaturitiesMember2020-12-310001363829esgr:FundsHeldDirectlyManagedMemberesgr:OtherGovernmentAgenciesDebtSecuritiesMember2020-12-310001363829esgr:OtherGovernmentAgenciesDebtSecuritiesMember2020-12-310001363829us-gaap:CorporateDebtSecuritiesMemberus-gaap:ShortTermInvestmentsMember2020-12-310001363829us-gaap:CorporateDebtSecuritiesMemberus-gaap:FixedMaturitiesMember2020-12-310001363829us-gaap:CorporateDebtSecuritiesMemberesgr:FundsHeldDirectlyManagedMember2020-12-310001363829us-gaap:CorporateDebtSecuritiesMember2020-12-310001363829us-gaap:ShortTermInvestmentsMemberus-gaap:MunicipalBondsMember2020-12-310001363829us-gaap:MunicipalBondsMemberus-gaap:FixedMaturitiesMember2020-12-310001363829us-gaap:MunicipalBondsMemberesgr:FundsHeldDirectlyManagedMember2020-12-310001363829us-gaap:MunicipalBondsMember2020-12-310001363829us-gaap:ResidentialMortgageBackedSecuritiesMemberus-gaap:ShortTermInvestmentsMember2020-12-310001363829us-gaap:ResidentialMortgageBackedSecuritiesMemberus-gaap:FixedMaturitiesMember2020-12-310001363829us-gaap:ResidentialMortgageBackedSecuritiesMemberesgr:FundsHeldDirectlyManagedMember2020-12-310001363829us-gaap:ResidentialMortgageBackedSecuritiesMember2020-12-310001363829us-gaap:CommercialMortgageBackedSecuritiesMemberus-gaap:ShortTermInvestmentsMember2020-12-310001363829us-gaap:CommercialMortgageBackedSecuritiesMemberus-gaap:FixedMaturitiesMember2020-12-310001363829us-gaap:CommercialMortgageBackedSecuritiesMemberesgr:FundsHeldDirectlyManagedMember2020-12-310001363829us-gaap:CommercialMortgageBackedSecuritiesMember2020-12-310001363829us-gaap:AssetBackedSecuritiesMemberus-gaap:ShortTermInvestmentsMember2020-12-310001363829us-gaap:AssetBackedSecuritiesMemberus-gaap:FixedMaturitiesMember2020-12-310001363829us-gaap:AssetBackedSecuritiesMemberesgr:FundsHeldDirectlyManagedMember2020-12-310001363829us-gaap:AssetBackedSecuritiesMember2020-12-310001363829esgr:FundsHeldDirectlyManagedMember2020-12-310001363829us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember2021-03-310001363829us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember2020-12-310001363829esgr:ShortTermInvestmentsAndFixedMaturitiesMember2021-03-310001363829us-gaap:ResidentialMortgageBackedSecuritiesMemberesgr:ShortTermInvestmentsAndFixedMaturitiesMember2021-03-310001363829us-gaap:CommercialMortgageBackedSecuritiesMemberesgr:ShortTermInvestmentsAndFixedMaturitiesMember2021-03-310001363829us-gaap:AssetBackedSecuritiesMemberesgr:ShortTermInvestmentsAndFixedMaturitiesMember2021-03-310001363829esgr:PortfolioConcentrationRiskMemberesgr:TradingSecuritiesandAvailableforSaleSecuritiesMemberesgr:MarketableSecuritiesMemberus-gaap:USGovernmentAgenciesDebtSecuritiesMember2021-01-012021-03-310001363829us-gaap:ExternalCreditRatingInvestmentGradeMemberesgr:StandardPoorsFitchAAARatingMemberMemberus-gaap:USGovernmentAgenciesDebtSecuritiesMember2021-03-310001363829us-gaap:ExternalCreditRatingInvestmentGradeMemberus-gaap:USGovernmentAgenciesDebtSecuritiesMemberesgr:StandardPoorsFitchAARatingMember2021-03-310001363829us-gaap:ExternalCreditRatingInvestmentGradeMemberesgr:StandardPoorsFitchARatingMemberus-gaap:USGovernmentAgenciesDebtSecuritiesMember2021-03-310001363829us-gaap:ExternalCreditRatingInvestmentGradeMemberus-gaap:USGovernmentAgenciesDebtSecuritiesMemberesgr:StandardPoorsFitchBBBRatingMember2021-03-310001363829us-gaap:ExternalCreditRatingNonInvestmentGradeMemberus-gaap:USGovernmentAgenciesDebtSecuritiesMember2021-03-310001363829esgr:NotRatedMemberus-gaap:USGovernmentAgenciesDebtSecuritiesMember2021-03-310001363829esgr:PortfolioConcentrationRiskMemberesgr:UnitedKingdomGovernmentAgenciesDebtSecuritiesMemberesgr:TradingSecuritiesandAvailableforSaleSecuritiesMemberesgr:MarketableSecuritiesMember2021-01-012021-03-310001363829us-gaap:ExternalCreditRatingInvestmentGradeMemberesgr:StandardPoorsFitchAAARatingMemberMemberesgr:UnitedKingdomGovernmentAgenciesDebtSecuritiesMember2021-03-310001363829us-gaap:ExternalCreditRatingInvestmentGradeMemberesgr:UnitedKingdomGovernmentAgenciesDebtSecuritiesMemberesgr:StandardPoorsFitchAARatingMember2021-03-310001363829us-gaap:ExternalCreditRatingInvestmentGradeMemberesgr:StandardPoorsFitchARatingMemberesgr:UnitedKingdomGovernmentAgenciesDebtSecuritiesMember2021-03-310001363829us-gaap:ExternalCreditRatingInvestmentGradeMemberesgr:UnitedKingdomGovernmentAgenciesDebtSecuritiesMemberesgr:StandardPoorsFitchBBBRatingMember2021-03-310001363829us-gaap:ExternalCreditRatingNonInvestmentGradeMemberesgr:UnitedKingdomGovernmentAgenciesDebtSecuritiesMember2021-03-310001363829esgr:NotRatedMemberesgr:UnitedKingdomGovernmentAgenciesDebtSecuritiesMember2021-03-310001363829esgr:PortfolioConcentrationRiskMemberesgr:TradingSecuritiesandAvailableforSaleSecuritiesMemberesgr:MarketableSecuritiesMemberesgr:OtherGovernmentAgenciesDebtSecuritiesMember2021-01-012021-03-310001363829us-gaap:ExternalCreditRatingInvestmentGradeMemberesgr:StandardPoorsFitchAAARatingMemberMemberesgr:OtherGovernmentAgenciesDebtSecuritiesMember2021-03-310001363829us-gaap:ExternalCreditRatingInvestmentGradeMemberesgr:OtherGovernmentAgenciesDebtSecuritiesMemberesgr:StandardPoorsFitchAARatingMember2021-03-310001363829us-gaap:ExternalCreditRatingInvestmentGradeMemberesgr:StandardPoorsFitchARatingMemberesgr:OtherGovernmentAgenciesDebtSecuritiesMember2021-03-310001363829us-gaap:ExternalCreditRatingInvestmentGradeMemberesgr:OtherGovernmentAgenciesDebtSecuritiesMemberesgr:StandardPoorsFitchBBBRatingMember2021-03-310001363829us-gaap:ExternalCreditRatingNonInvestmentGradeMemberesgr:OtherGovernmentAgenciesDebtSecuritiesMember2021-03-310001363829esgr:NotRatedMemberesgr:OtherGovernmentAgenciesDebtSecuritiesMember2021-03-310001363829esgr:PortfolioConcentrationRiskMemberus-gaap:CorporateDebtSecuritiesMemberesgr:TradingSecuritiesandAvailableforSaleSecuritiesMemberesgr:MarketableSecuritiesMember2021-01-012021-03-310001363829us-gaap:ExternalCreditRatingInvestmentGradeMemberus-gaap:CorporateDebtSecuritiesMemberesgr:StandardPoorsFitchAAARatingMemberMember2021-03-310001363829us-gaap:ExternalCreditRatingInvestmentGradeMemberus-gaap:CorporateDebtSecuritiesMemberesgr:StandardPoorsFitchAARatingMember2021-03-310001363829us-gaap:ExternalCreditRatingInvestmentGradeMemberus-gaap:CorporateDebtSecuritiesMemberesgr:StandardPoorsFitchARatingMember2021-03-310001363829us-gaap:ExternalCreditRatingInvestmentGradeMemberus-gaap:CorporateDebtSecuritiesMemberesgr:StandardPoorsFitchBBBRatingMember2021-03-310001363829us-gaap:CorporateDebtSecuritiesMemberus-gaap:ExternalCreditRatingNonInvestmentGradeMember2021-03-310001363829esgr:NotRatedMemberus-gaap:CorporateDebtSecuritiesMember2021-03-310001363829esgr:PortfolioConcentrationRiskMemberus-gaap:MunicipalBondsMemberesgr:TradingSecuritiesandAvailableforSaleSecuritiesMemberesgr:MarketableSecuritiesMember2021-01-012021-03-310001363829us-gaap:ExternalCreditRatingInvestmentGradeMemberus-gaap:MunicipalBondsMemberesgr:StandardPoorsFitchAAARatingMemberMember2021-03-310001363829us-gaap:ExternalCreditRatingInvestmentGradeMemberus-gaap:MunicipalBondsMemberesgr:StandardPoorsFitchAARatingMember2021-03-310001363829us-gaap:ExternalCreditRatingInvestmentGradeMemberus-gaap:MunicipalBondsMemberesgr:StandardPoorsFitchARatingMember2021-03-310001363829us-gaap:ExternalCreditRatingInvestmentGradeMemberus-gaap:MunicipalBondsMemberesgr:StandardPoorsFitchBBBRatingMember2021-03-310001363829us-gaap:ExternalCreditRatingNonInvestmentGradeMemberus-gaap:MunicipalBondsMember2021-03-310001363829esgr:NotRatedMemberus-gaap:MunicipalBondsMember2021-03-310001363829esgr:PortfolioConcentrationRiskMemberus-gaap:ResidentialMortgageBackedSecuritiesMemberesgr:TradingSecuritiesandAvailableforSaleSecuritiesMemberesgr:MarketableSecuritiesMember2021-01-012021-03-310001363829us-gaap:ExternalCreditRatingInvestmentGradeMemberus-gaap:ResidentialMortgageBackedSecuritiesMemberesgr:StandardPoorsFitchAAARatingMemberMember2021-03-310001363829us-gaap:ExternalCreditRatingInvestmentGradeMemberus-gaap:ResidentialMortgageBackedSecuritiesMemberesgr:StandardPoorsFitchAARatingMember2021-03-310001363829us-gaap:ExternalCreditRatingInvestmentGradeMemberus-gaap:ResidentialMortgageBackedSecuritiesMemberesgr:StandardPoorsFitchARatingMember2021-03-310001363829us-gaap:ExternalCreditRatingInvestmentGradeMemberus-gaap:ResidentialMortgageBackedSecuritiesMemberesgr:StandardPoorsFitchBBBRatingMember2021-03-310001363829us-gaap:ResidentialMortgageBackedSecuritiesMemberus-gaap:ExternalCreditRatingNonInvestmentGradeMember2021-03-310001363829esgr:NotRatedMemberus-gaap:ResidentialMortgageBackedSecuritiesMember2021-03-310001363829esgr:PortfolioConcentrationRiskMemberus-gaap:CommercialMortgageBackedSecuritiesMemberesgr:TradingSecuritiesandAvailableforSaleSecuritiesMemberesgr:MarketableSecuritiesMember2021-01-012021-03-310001363829us-gaap:CommercialMortgageBackedSecuritiesMemberus-gaap:ExternalCreditRatingInvestmentGradeMemberesgr:StandardPoorsFitchAAARatingMemberMember2021-03-310001363829us-gaap:CommercialMortgageBackedSecuritiesMemberus-gaap:ExternalCreditRatingInvestmentGradeMemberesgr:StandardPoorsFitchAARatingMember2021-03-310001363829us-gaap:CommercialMortgageBackedSecuritiesMemberus-gaap:ExternalCreditRatingInvestmentGradeMemberesgr:StandardPoorsFitchARatingMember2021-03-310001363829us-gaap:CommercialMortgageBackedSecuritiesMemberus-gaap:ExternalCreditRatingInvestmentGradeMemberesgr:StandardPoorsFitchBBBRatingMember2021-03-310001363829us-gaap:CommercialMortgageBackedSecuritiesMemberus-gaap:ExternalCreditRatingNonInvestmentGradeMember2021-03-310001363829us-gaap:CommercialMortgageBackedSecuritiesMemberesgr:NotRatedMember2021-03-310001363829esgr:PortfolioConcentrationRiskMemberus-gaap:AssetBackedSecuritiesMemberesgr:TradingSecuritiesandAvailableforSaleSecuritiesMemberesgr:MarketableSecuritiesMember2021-01-012021-03-310001363829us-gaap:AssetBackedSecuritiesMemberus-gaap:ExternalCreditRatingInvestmentGradeMemberesgr:StandardPoorsFitchAAARatingMemberMember2021-03-310001363829us-gaap:AssetBackedSecuritiesMemberus-gaap:ExternalCreditRatingInvestmentGradeMemberesgr:StandardPoorsFitchAARatingMember2021-03-310001363829us-gaap:AssetBackedSecuritiesMemberus-gaap:ExternalCreditRatingInvestmentGradeMemberesgr:StandardPoorsFitchARatingMember2021-03-310001363829us-gaap:AssetBackedSecuritiesMemberus-gaap:ExternalCreditRatingInvestmentGradeMemberesgr:StandardPoorsFitchBBBRatingMember2021-03-310001363829us-gaap:AssetBackedSecuritiesMemberus-gaap:ExternalCreditRatingNonInvestmentGradeMember2021-03-310001363829us-gaap:AssetBackedSecuritiesMemberesgr:NotRatedMember2021-03-310001363829esgr:PortfolioConcentrationRiskMemberesgr:TradingSecuritiesandAvailableforSaleSecuritiesMemberesgr:MarketableSecuritiesMember2021-01-012021-03-310001363829us-gaap:ExternalCreditRatingInvestmentGradeMemberesgr:StandardPoorsFitchAAARatingMemberMember2021-03-310001363829us-gaap:ExternalCreditRatingInvestmentGradeMemberesgr:StandardPoorsFitchAARatingMember2021-03-310001363829us-gaap:ExternalCreditRatingInvestmentGradeMemberesgr:StandardPoorsFitchARatingMember2021-03-310001363829us-gaap:ExternalCreditRatingInvestmentGradeMemberesgr:StandardPoorsFitchBBBRatingMember2021-03-310001363829us-gaap:ExternalCreditRatingNonInvestmentGradeMember2021-03-310001363829esgr:NotRatedMember2021-03-310001363829us-gaap:ExternalCreditRatingInvestmentGradeMemberesgr:CreditRatingConcentrationRiskMemberesgr:StandardPoorsFitchAAARatingMemberMemberesgr:MarketableSecuritiesMember2021-01-012021-03-310001363829us-gaap:ExternalCreditRatingInvestmentGradeMemberesgr:CreditRatingConcentrationRiskMemberesgr:MarketableSecuritiesMemberesgr:StandardPoorsFitchAARatingMember2021-01-012021-03-310001363829us-gaap:ExternalCreditRatingInvestmentGradeMemberesgr:CreditRatingConcentrationRiskMemberesgr:StandardPoorsFitchARatingMemberesgr:MarketableSecuritiesMember2021-01-012021-03-310001363829us-gaap:ExternalCreditRatingInvestmentGradeMemberesgr:CreditRatingConcentrationRiskMemberesgr:MarketableSecuritiesMemberesgr:StandardPoorsFitchBBBRatingMember2021-01-012021-03-310001363829us-gaap:ExternalCreditRatingNonInvestmentGradeMemberesgr:CreditRatingConcentrationRiskMemberesgr:MarketableSecuritiesMember2021-01-012021-03-310001363829esgr:NotRatedMemberesgr:CreditRatingConcentrationRiskMemberesgr:MarketableSecuritiesMember2021-01-012021-03-310001363829us-gaap:ForeignGovernmentDebtSecuritiesMember2021-03-31esgr:Security0001363829srt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2019-12-310001363829srt:CumulativeEffectPeriodOfAdoptionAdjustmentMemberesgr:OtherGovernmentAgenciesDebtSecuritiesMember2020-12-310001363829us-gaap:CorporateDebtSecuritiesMembersrt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2020-12-310001363829us-gaap:CommercialMortgageBackedSecuritiesMembersrt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2020-12-310001363829us-gaap:AssetBackedSecuritiesMembersrt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2020-12-310001363829srt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2020-12-310001363829esgr:OtherGovernmentAgenciesDebtSecuritiesMember2021-01-012021-03-310001363829us-gaap:CorporateDebtSecuritiesMember2021-01-012021-03-310001363829us-gaap:CommercialMortgageBackedSecuritiesMember2021-01-012021-03-310001363829us-gaap:AssetBackedSecuritiesMember2021-01-012021-03-310001363829esgr:OtherGovernmentAgenciesDebtSecuritiesMember2019-12-310001363829us-gaap:CorporateDebtSecuritiesMember2019-12-310001363829us-gaap:CommercialMortgageBackedSecuritiesMember2019-12-310001363829us-gaap:AssetBackedSecuritiesMember2019-12-310001363829srt:CumulativeEffectPeriodOfAdoptionAdjustmentMemberesgr:OtherGovernmentAgenciesDebtSecuritiesMember2019-12-310001363829us-gaap:CorporateDebtSecuritiesMembersrt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2019-12-310001363829us-gaap:CommercialMortgageBackedSecuritiesMembersrt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2019-12-310001363829us-gaap:AssetBackedSecuritiesMembersrt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2019-12-310001363829esgr:OtherGovernmentAgenciesDebtSecuritiesMember2020-01-012020-03-310001363829us-gaap:CorporateDebtSecuritiesMember2020-01-012020-03-310001363829us-gaap:CommercialMortgageBackedSecuritiesMember2020-01-012020-03-310001363829us-gaap:AssetBackedSecuritiesMember2020-01-012020-03-310001363829esgr:OtherGovernmentAgenciesDebtSecuritiesMember2020-03-310001363829us-gaap:CorporateDebtSecuritiesMember2020-03-310001363829us-gaap:CommercialMortgageBackedSecuritiesMember2020-03-310001363829us-gaap:AssetBackedSecuritiesMember2020-03-310001363829esgr:PublicEquityFundsMember2021-03-310001363829esgr:PublicEquityFundsMember2020-12-310001363829us-gaap:ExchangeTradedFundsMember2021-03-310001363829us-gaap:ExchangeTradedFundsMember2020-12-310001363829us-gaap:PrivateEquityFundsMember2021-03-310001363829us-gaap:PrivateEquityFundsMember2020-12-310001363829esgr:AmTrustFinancialServicesInc.Member2021-03-310001363829esgr:AmTrustFinancialServicesInc.Member2020-12-310001363829us-gaap:HedgeFundsMember2021-03-310001363829us-gaap:HedgeFundsMember2020-12-310001363829us-gaap:FixedIncomeFundsMember2021-03-310001363829us-gaap:FixedIncomeFundsMember2020-12-310001363829us-gaap:EquityFundsMember2021-03-310001363829us-gaap:EquityFundsMember2020-12-310001363829us-gaap:PrivateEquityFundsMember2021-03-310001363829us-gaap:PrivateEquityFundsMember2020-12-310001363829esgr:CLOEquityMember2021-03-310001363829esgr:CLOEquityMember2020-12-310001363829esgr:CLOEquityFundsMember2021-03-310001363829esgr:CLOEquityFundsMember2020-12-310001363829esgr:PrivateCreditFundsMember2021-03-310001363829esgr:PrivateCreditFundsMember2020-12-310001363829us-gaap:OtherLongTermInvestmentsMember2021-03-310001363829us-gaap:OtherLongTermInvestmentsMember2020-12-310001363829us-gaap:OtherInvestmentsMember2021-03-310001363829us-gaap:HedgeFundsMemberesgr:RestrictionPeriodLessThanOneYearMember2021-03-310001363829us-gaap:HedgeFundsMemberesgr:RestrictionPeriodOneToTwoYearsMember2021-03-310001363829us-gaap:HedgeFundsMemberesgr:RestrictionPeriodTwoToThreeYearsMember2021-03-310001363829us-gaap:HedgeFundsMemberesgr:RestrictionPeriodMoreThanThreeYearsMember2021-03-310001363829us-gaap:HedgeFundsMemberesgr:RestrictionPeriodNotEligibleRestrictedMember2021-03-310001363829esgr:RestrictionPeriodLessThanOneYearMemberus-gaap:FixedIncomeFundsMember2021-03-310001363829esgr:RestrictionPeriodOneToTwoYearsMemberus-gaap:FixedIncomeFundsMember2021-03-310001363829esgr:RestrictionPeriodTwoToThreeYearsMemberus-gaap:FixedIncomeFundsMember2021-03-310001363829esgr:RestrictionPeriodMoreThanThreeYearsMemberus-gaap:FixedIncomeFundsMember2021-03-310001363829esgr:RestrictionPeriodNotEligibleRestrictedMemberus-gaap:FixedIncomeFundsMember2021-03-310001363829us-gaap:EquityFundsMemberesgr:RestrictionPeriodLessThanOneYearMember2021-03-310001363829us-gaap:EquityFundsMemberesgr:RestrictionPeriodOneToTwoYearsMember2021-03-310001363829us-gaap:EquityFundsMemberesgr:RestrictionPeriodTwoToThreeYearsMember2021-03-310001363829esgr:RestrictionPeriodMoreThanThreeYearsMemberus-gaap:EquityFundsMember2021-03-310001363829us-gaap:EquityFundsMemberesgr:RestrictionPeriodNotEligibleRestrictedMember2021-03-310001363829us-gaap:PrivateEquityFundsMemberesgr:RestrictionPeriodLessThanOneYearMember2021-03-310001363829us-gaap:PrivateEquityFundsMemberesgr:RestrictionPeriodOneToTwoYearsMember2021-03-310001363829us-gaap:PrivateEquityFundsMemberesgr:RestrictionPeriodTwoToThreeYearsMember2021-03-310001363829us-gaap:PrivateEquityFundsMemberesgr:RestrictionPeriodMoreThanThreeYearsMember2021-03-310001363829us-gaap:PrivateEquityFundsMemberesgr:RestrictionPeriodNotEligibleRestrictedMember2021-03-310001363829esgr:CLOEquityMemberesgr:RestrictionPeriodLessThanOneYearMember2021-03-310001363829esgr:CLOEquityMemberesgr:RestrictionPeriodOneToTwoYearsMember2021-03-310001363829esgr:CLOEquityMemberesgr:RestrictionPeriodTwoToThreeYearsMember2021-03-310001363829esgr:RestrictionPeriodMoreThanThreeYearsMemberesgr:CLOEquityMember2021-03-310001363829esgr:CLOEquityMemberesgr:RestrictionPeriodNotEligibleRestrictedMember2021-03-310001363829esgr:RestrictionPeriodLessThanOneYearMemberesgr:CLOEquityFundsMember2021-03-310001363829esgr:RestrictionPeriodOneToTwoYearsMemberesgr:CLOEquityFundsMember2021-03-310001363829esgr:RestrictionPeriodTwoToThreeYearsMemberesgr:CLOEquityFundsMember2021-03-310001363829esgr:RestrictionPeriodMoreThanThreeYearsMemberesgr:CLOEquityFundsMember2021-03-310001363829esgr:RestrictionPeriodNotEligibleRestrictedMemberesgr:CLOEquityFundsMember2021-03-310001363829esgr:RestrictionPeriodLessThanOneYearMemberesgr:PrivateCreditFundsMember2021-03-310001363829esgr:RestrictionPeriodOneToTwoYearsMemberesgr:PrivateCreditFundsMember2021-03-310001363829esgr:RestrictionPeriodTwoToThreeYearsMemberesgr:PrivateCreditFundsMember2021-03-310001363829esgr:RestrictionPeriodMoreThanThreeYearsMemberesgr:PrivateCreditFundsMember2021-03-310001363829esgr:RestrictionPeriodNotEligibleRestrictedMemberesgr:PrivateCreditFundsMember2021-03-310001363829esgr:RestrictionPeriodLessThanOneYearMemberus-gaap:OtherLongTermInvestmentsMember2021-03-310001363829esgr:RestrictionPeriodOneToTwoYearsMemberus-gaap:OtherLongTermInvestmentsMember2021-03-310001363829esgr:RestrictionPeriodTwoToThreeYearsMemberus-gaap:OtherLongTermInvestmentsMember2021-03-310001363829esgr:RestrictionPeriodMoreThanThreeYearsMemberus-gaap:OtherLongTermInvestmentsMember2021-03-310001363829esgr:RestrictionPeriodNotEligibleRestrictedMemberus-gaap:OtherLongTermInvestmentsMember2021-03-310001363829esgr:RestrictionPeriodLessThanOneYearMember2021-03-310001363829esgr:RestrictionPeriodOneToTwoYearsMember2021-03-310001363829esgr:RestrictionPeriodTwoToThreeYearsMember2021-03-310001363829esgr:RestrictionPeriodMoreThanThreeYearsMember2021-03-310001363829esgr:RestrictionPeriodNotEligibleRestrictedMember2021-03-310001363829us-gaap:HedgeFundsMemberesgr:RestrictionPeriodNotEligibleRestrictedMember2020-12-310001363829esgr:EnhanzedReMember2021-03-310001363829esgr:EnhanzedReMember2020-12-310001363829esgr:CitcoIIILimitedMemberus-gaap:CommonStockMember2021-03-310001363829esgr:CitcoIIILimitedMemberus-gaap:CommonStockMember2020-12-310001363829esgr:CitcoIIILimitedMember2021-03-310001363829esgr:CitcoIIILimitedMember2020-12-310001363829esgr:MonumentMemberus-gaap:CommonStockMember2021-03-310001363829esgr:MonumentMember2021-03-310001363829esgr:MonumentMemberus-gaap:CommonStockMember2020-12-310001363829esgr:MonumentMember2020-12-310001363829esgr:OtherEquityMethodInvestmentsMember2021-03-310001363829esgr:OtherEquityMethodInvestmentsMember2020-12-310001363829esgr:CitcoIIILimitedMemberus-gaap:ConvertiblePreferredStockMemberesgr:CTCOHoldingsLimitedMember2021-03-310001363829esgr:CitcoIIILimitedMemberesgr:CTCOHoldingsLimitedMember2021-03-310001363829us-gaap:EquityMethodInvestmentsMember2021-03-310001363829esgr:FundsHeldDirectlyManagedFairValueOptionMember2021-03-310001363829esgr:FundsHeldDirectlyManagedVariableReturnOptionMember2021-03-310001363829esgr:FundsHeldDirectlyManagedFairValueOptionMember2020-12-310001363829esgr:FundsHeldDirectlyManagedVariableReturnOptionMember2020-12-310001363829us-gaap:FixedMaturitiesMember2021-01-012021-03-310001363829us-gaap:FixedMaturitiesMember2020-01-012020-03-310001363829esgr:ShortTermInvestmentsAndCashEquivalentsMember2021-01-012021-03-310001363829esgr:ShortTermInvestmentsAndCashEquivalentsMember2020-01-012020-03-310001363829esgr:FundsHeldMember2021-01-012021-03-310001363829esgr:FundsHeldMember2020-01-012020-03-310001363829esgr:FundsHeldDirectlyManagedMember2021-01-012021-03-310001363829esgr:FundsHeldDirectlyManagedMember2020-01-012020-03-310001363829esgr:FixedMaturitiesandCashandCashEquivalentsMember2021-01-012021-03-310001363829esgr:FixedMaturitiesandCashandCashEquivalentsMember2020-01-012020-03-310001363829us-gaap:EquitySecuritiesMember2021-01-012021-03-310001363829us-gaap:EquitySecuritiesMember2020-01-012020-03-310001363829us-gaap:OtherInvestmentsMember2021-01-012021-03-310001363829us-gaap:OtherInvestmentsMember2020-01-012020-03-310001363829esgr:EquitiesandOtherInvestmentsMember2021-01-012021-03-310001363829esgr:EquitiesandOtherInvestmentsMember2020-01-012020-03-310001363829us-gaap:DebtSecuritiesMember2021-01-012021-03-310001363829us-gaap:DebtSecuritiesMember2020-01-012020-03-310001363829us-gaap:DiscontinuedOperationsHeldForSaleOrDisposedOfBySaleMember2021-01-012021-03-310001363829us-gaap:DiscontinuedOperationsHeldForSaleOrDisposedOfBySaleMember2020-01-012020-03-310001363829us-gaap:SegmentContinuingOperationsMember2021-01-012021-03-310001363829us-gaap:SegmentContinuingOperationsMember2020-01-012020-03-310001363829us-gaap:AssetPledgedAsCollateralMember2021-03-310001363829us-gaap:AssetPledgedAsCollateralMember2020-12-31esgr:Segment0001363829us-gaap:ForeignExchangeForwardMemberus-gaap:DesignatedAsHedgingInstrumentMembercurrency:AUD2021-03-310001363829us-gaap:ForeignExchangeForwardMemberus-gaap:DesignatedAsHedgingInstrumentMembercurrency:AUD2020-12-310001363829us-gaap:ForeignExchangeForwardMemberus-gaap:DesignatedAsHedgingInstrumentMembercurrency:EUR2021-03-310001363829us-gaap:ForeignExchangeForwardMemberus-gaap:DesignatedAsHedgingInstrumentMembercurrency:EUR2020-12-310001363829us-gaap:ForeignExchangeForwardMembercurrency:GBPus-gaap:DesignatedAsHedgingInstrumentMember2021-03-310001363829us-gaap:ForeignExchangeForwardMembercurrency:GBPus-gaap:DesignatedAsHedgingInstrumentMember2020-12-310001363829us-gaap:ForeignExchangeForwardMemberus-gaap:DesignatedAsHedgingInstrumentMember2021-03-310001363829us-gaap:ForeignExchangeForwardMemberus-gaap:DesignatedAsHedgingInstrumentMember2020-12-310001363829us-gaap:ForeignExchangeForwardMemberus-gaap:DesignatedAsHedgingInstrumentMembercurrency:AUD2021-01-012021-03-310001363829us-gaap:ForeignExchangeForwardMemberus-gaap:DesignatedAsHedgingInstrumentMembercurrency:AUD2020-01-012020-03-310001363829us-gaap:ForeignExchangeForwardMemberus-gaap:DesignatedAsHedgingInstrumentMembercurrency:EUR2021-01-012021-03-310001363829us-gaap:ForeignExchangeForwardMemberus-gaap:DesignatedAsHedgingInstrumentMembercurrency:EUR2020-01-012020-03-310001363829us-gaap:ForeignExchangeForwardMembercurrency:GBPus-gaap:DesignatedAsHedgingInstrumentMember2021-01-012021-03-310001363829us-gaap:ForeignExchangeForwardMembercurrency:GBPus-gaap:DesignatedAsHedgingInstrumentMember2020-01-012020-03-310001363829us-gaap:ForeignExchangeForwardMemberus-gaap:DesignatedAsHedgingInstrumentMember2021-01-012021-03-310001363829us-gaap:ForeignExchangeForwardMemberus-gaap:DesignatedAsHedgingInstrumentMember2020-01-012020-03-310001363829us-gaap:ForeignExchangeForwardMembercurrency:AUDus-gaap:NondesignatedMember2021-03-310001363829us-gaap:ForeignExchangeForwardMembercurrency:AUDus-gaap:NondesignatedMember2020-12-310001363829us-gaap:ForeignExchangeForwardMemberus-gaap:NondesignatedMembercurrency:CAD2021-03-310001363829us-gaap:ForeignExchangeForwardMemberus-gaap:NondesignatedMembercurrency:CAD2020-12-310001363829us-gaap:ForeignExchangeForwardMembercurrency:EURus-gaap:NondesignatedMember2021-03-310001363829us-gaap:ForeignExchangeForwardMembercurrency:EURus-gaap:NondesignatedMember2020-12-310001363829us-gaap:ForeignExchangeForwardMembercurrency:GBPus-gaap:NondesignatedMember2021-03-310001363829us-gaap:ForeignExchangeForwardMembercurrency:GBPus-gaap:NondesignatedMember2020-12-310001363829us-gaap:ForeignExchangeForwardMemberus-gaap:NondesignatedMember2021-03-310001363829us-gaap:ForeignExchangeForwardMemberus-gaap:NondesignatedMember2020-12-310001363829us-gaap:ForeignExchangeForwardMembercurrency:AUDus-gaap:NondesignatedMember2021-01-012021-03-310001363829us-gaap:ForeignExchangeForwardMembercurrency:AUDus-gaap:NondesignatedMember2020-01-012020-03-310001363829us-gaap:ForeignExchangeForwardMemberus-gaap:NondesignatedMembercurrency:CAD2021-01-012021-03-310001363829us-gaap:ForeignExchangeForwardMemberus-gaap:NondesignatedMembercurrency:CAD2020-01-012020-03-310001363829us-gaap:ForeignExchangeForwardMembercurrency:EURus-gaap:NondesignatedMember2021-01-012021-03-310001363829us-gaap:ForeignExchangeForwardMembercurrency:EURus-gaap:NondesignatedMember2020-01-012020-03-310001363829us-gaap:ForeignExchangeForwardMembercurrency:GBPus-gaap:NondesignatedMember2021-01-012021-03-310001363829us-gaap:ForeignExchangeForwardMembercurrency:GBPus-gaap:NondesignatedMember2020-01-012020-03-310001363829us-gaap:ForeignExchangeForwardMemberus-gaap:NondesignatedMember2021-01-012021-03-310001363829us-gaap:ForeignExchangeForwardMemberus-gaap:NondesignatedMember2020-01-012020-03-310001363829us-gaap:StockOptionMemberus-gaap:NondesignatedMember2020-01-012020-03-310001363829us-gaap:StockOptionMemberus-gaap:NondesignatedMember2018-12-31iso4217:AUD0001363829us-gaap:InterestRateSwapMember2019-12-310001363829us-gaap:InterestRateSwapMember2020-01-012020-03-310001363829us-gaap:InterestRateSwapMember2019-01-012020-04-070001363829us-gaap:LongMemberesgr:GovernmentBondFutureContractMember2021-03-310001363829us-gaap:ShortMemberesgr:GovernmentBondFutureContractMember2021-03-310001363829us-gaap:ForeignExchangeForwardMembercurrency:USDus-gaap:LongMember2021-03-310001363829us-gaap:ForeignExchangeForwardMembercurrency:USDus-gaap:ShortMember2021-03-310001363829us-gaap:ForeignExchangeForwardMembercurrency:GBPus-gaap:LongMember2021-03-310001363829us-gaap:ForeignExchangeForwardMembercurrency:GBPus-gaap:ShortMember2021-03-310001363829esgr:CreditRiskGovernmentBondFutureForeignCurrencyForwardContractsMember2021-03-310001363829us-gaap:LongMemberesgr:GovernmentBondFutureContractMember2020-12-310001363829us-gaap:ShortMemberesgr:GovernmentBondFutureContractMember2020-12-310001363829us-gaap:ForeignExchangeForwardMembercurrency:USDus-gaap:LongMember2020-12-310001363829us-gaap:ForeignExchangeForwardMembercurrency:USDus-gaap:ShortMember2020-12-310001363829us-gaap:ForeignExchangeForwardMembercurrency:GBPus-gaap:LongMember2020-12-310001363829us-gaap:ForeignExchangeForwardMembercurrency:GBPus-gaap:ShortMember2020-12-310001363829esgr:CreditRiskGovernmentBondFutureForeignCurrencyForwardContractsMember2020-12-310001363829esgr:GovernmentBondFutureContractMember2021-01-012021-03-310001363829us-gaap:ForeignExchangeForwardMember2021-01-012021-03-310001363829esgr:RunOffMember2021-03-310001363829esgr:LegacyUnderwritingSegmentMember2021-03-310001363829us-gaap:CorporateNonSegmentMember2021-03-310001363829esgr:RunOffMember2020-12-310001363829esgr:LegacyUnderwritingSegmentMember2020-12-310001363829us-gaap:CorporateNonSegmentMember2020-12-310001363829esgr:TopTenReinsurersMemberus-gaap:ReinsurerConcentrationRiskMemberus-gaap:ReinsuranceRecoverableMemberesgr:RunOffMember2021-03-310001363829esgr:TopTenReinsurersMemberesgr:LegacyUnderwritingSegmentMemberus-gaap:ReinsurerConcentrationRiskMemberus-gaap:ReinsuranceRecoverableMember2021-03-310001363829esgr:TopTenReinsurersMemberus-gaap:ReinsurerConcentrationRiskMemberus-gaap:CorporateNonSegmentMemberus-gaap:ReinsuranceRecoverableMember2021-03-310001363829esgr:TopTenReinsurersMemberus-gaap:ReinsurerConcentrationRiskMemberus-gaap:ReinsuranceRecoverableMember2021-03-310001363829esgr:TopTenReinsurersMemberus-gaap:ReinsurerConcentrationRiskMemberus-gaap:ReinsuranceRecoverableMember2021-01-012021-03-310001363829esgr:OtherReinsurersBalancesGreaterThanOneMillionDollarsMemberus-gaap:ReinsurerConcentrationRiskMemberus-gaap:ReinsuranceRecoverableMemberesgr:RunOffMember2021-03-310001363829esgr:LegacyUnderwritingSegmentMemberesgr:OtherReinsurersBalancesGreaterThanOneMillionDollarsMemberus-gaap:ReinsurerConcentrationRiskMemberus-gaap:ReinsuranceRecoverableMember2021-03-310001363829esgr:OtherReinsurersBalancesGreaterThanOneMillionDollarsMemberus-gaap:ReinsurerConcentrationRiskMemberus-gaap:CorporateNonSegmentMemberus-gaap:ReinsuranceRecoverableMember2021-03-310001363829esgr:OtherReinsurersBalancesGreaterThanOneMillionDollarsMemberus-gaap:ReinsurerConcentrationRiskMemberus-gaap:ReinsuranceRecoverableMember2021-03-310001363829esgr:OtherReinsurersBalancesGreaterThanOneMillionDollarsMemberus-gaap:ReinsurerConcentrationRiskMemberus-gaap:ReinsuranceRecoverableMember2021-01-012021-03-310001363829us-gaap:ReinsurerConcentrationRiskMemberus-gaap:ReinsuranceRecoverableMemberesgr:RunOffMemberesgr:OtherReinsurersBalancesLessThanOneMillionDollarsMember2021-03-310001363829esgr:LegacyUnderwritingSegmentMemberus-gaap:ReinsurerConcentrationRiskMemberus-gaap:ReinsuranceRecoverableMemberesgr:OtherReinsurersBalancesLessThanOneMillionDollarsMember2021-03-310001363829us-gaap:ReinsurerConcentrationRiskMemberus-gaap:CorporateNonSegmentMemberus-gaap:ReinsuranceRecoverableMemberesgr:OtherReinsurersBalancesLessThanOneMillionDollarsMember2021-03-310001363829us-gaap:ReinsurerConcentrationRiskMemberus-gaap:ReinsuranceRecoverableMemberesgr:OtherReinsurersBalancesLessThanOneMillionDollarsMember2021-03-310001363829us-gaap:ReinsurerConcentrationRiskMemberus-gaap:ReinsuranceRecoverableMemberesgr:OtherReinsurersBalancesLessThanOneMillionDollarsMember2021-01-012021-03-310001363829us-gaap:ReinsurerConcentrationRiskMemberus-gaap:ReinsuranceRecoverableMemberesgr:RunOffMember2021-03-310001363829esgr:LegacyUnderwritingSegmentMemberus-gaap:ReinsurerConcentrationRiskMemberus-gaap:ReinsuranceRecoverableMember2021-03-310001363829us-gaap:ReinsurerConcentrationRiskMemberus-gaap:CorporateNonSegmentMemberus-gaap:ReinsuranceRecoverableMember2021-03-310001363829us-gaap:ReinsurerConcentrationRiskMemberus-gaap:ReinsuranceRecoverableMember2021-03-310001363829us-gaap:ReinsurerConcentrationRiskMemberus-gaap:ReinsuranceRecoverableMember2021-01-012021-03-310001363829esgr:TopTenReinsurersMemberus-gaap:ReinsurerConcentrationRiskMemberus-gaap:ReinsuranceRecoverableMemberesgr:RunOffMember2020-12-310001363829esgr:TopTenReinsurersMemberesgr:LegacyUnderwritingSegmentMemberus-gaap:ReinsurerConcentrationRiskMemberus-gaap:ReinsuranceRecoverableMember2020-12-310001363829esgr:TopTenReinsurersMemberus-gaap:ReinsurerConcentrationRiskMemberus-gaap:CorporateNonSegmentMemberus-gaap:ReinsuranceRecoverableMember2020-12-310001363829esgr:TopTenReinsurersMemberus-gaap:ReinsurerConcentrationRiskMemberus-gaap:ReinsuranceRecoverableMember2020-12-310001363829esgr:TopTenReinsurersMemberus-gaap:ReinsurerConcentrationRiskMemberus-gaap:ReinsuranceRecoverableMember2020-01-012020-12-310001363829esgr:OtherReinsurersBalancesGreaterThanOneMillionDollarsMemberus-gaap:ReinsurerConcentrationRiskMemberus-gaap:ReinsuranceRecoverableMemberesgr:RunOffMember2020-12-310001363829esgr:LegacyUnderwritingSegmentMemberesgr:OtherReinsurersBalancesGreaterThanOneMillionDollarsMemberus-gaap:ReinsurerConcentrationRiskMemberus-gaap:ReinsuranceRecoverableMember2020-12-310001363829esgr:OtherReinsurersBalancesGreaterThanOneMillionDollarsMemberus-gaap:ReinsurerConcentrationRiskMemberus-gaap:CorporateNonSegmentMemberus-gaap:ReinsuranceRecoverableMember2020-12-310001363829esgr:OtherReinsurersBalancesGreaterThanOneMillionDollarsMemberus-gaap:ReinsurerConcentrationRiskMemberus-gaap:ReinsuranceRecoverableMember2020-12-310001363829esgr:OtherReinsurersBalancesGreaterThanOneMillionDollarsMemberus-gaap:ReinsurerConcentrationRiskMemberus-gaap:ReinsuranceRecoverableMember2020-01-012020-12-310001363829us-gaap:ReinsurerConcentrationRiskMemberus-gaap:ReinsuranceRecoverableMemberesgr:RunOffMemberesgr:OtherReinsurersBalancesLessThanOneMillionDollarsMember2020-12-310001363829esgr:LegacyUnderwritingSegmentMemberus-gaap:ReinsurerConcentrationRiskMemberus-gaap:ReinsuranceRecoverableMemberesgr:OtherReinsurersBalancesLessThanOneMillionDollarsMember2020-12-310001363829us-gaap:ReinsurerConcentrationRiskMemberus-gaap:CorporateNonSegmentMemberus-gaap:ReinsuranceRecoverableMemberesgr:OtherReinsurersBalancesLessThanOneMillionDollarsMember2020-12-310001363829us-gaap:ReinsurerConcentrationRiskMemberus-gaap:ReinsuranceRecoverableMemberesgr:OtherReinsurersBalancesLessThanOneMillionDollarsMember2020-12-310001363829us-gaap:ReinsurerConcentrationRiskMemberus-gaap:ReinsuranceRecoverableMemberesgr:OtherReinsurersBalancesLessThanOneMillionDollarsMember2020-01-012020-12-310001363829us-gaap:ReinsurerConcentrationRiskMemberus-gaap:ReinsuranceRecoverableMemberesgr:RunOffMember2020-12-310001363829esgr:LegacyUnderwritingSegmentMemberus-gaap:ReinsurerConcentrationRiskMemberus-gaap:ReinsuranceRecoverableMember2020-12-310001363829us-gaap:ReinsurerConcentrationRiskMemberus-gaap:CorporateNonSegmentMemberus-gaap:ReinsuranceRecoverableMember2020-12-310001363829us-gaap:ReinsurerConcentrationRiskMemberus-gaap:ReinsuranceRecoverableMember2020-12-310001363829us-gaap:ReinsurerConcentrationRiskMemberus-gaap:ReinsuranceRecoverableMember2020-01-012020-12-31esgr:reinsurer0001363829esgr:TopTenReinsurersRatedAMinusOrHigherMemberus-gaap:ReinsurerConcentrationRiskMemberus-gaap:ReinsuranceRecoverableMember2021-03-310001363829esgr:TopTenReinsurersRatedAMinusOrHigherMemberus-gaap:ReinsurerConcentrationRiskMemberus-gaap:ReinsuranceRecoverableMember2020-12-310001363829us-gaap:ReinsurerConcentrationRiskMemberesgr:TopTenReinsurersNonRatedReinsurersMemberus-gaap:ReinsuranceRecoverableMember2021-03-310001363829us-gaap:ReinsurerConcentrationRiskMemberesgr:TopTenReinsurersNonRatedReinsurersMemberus-gaap:ReinsuranceRecoverableMember2020-12-310001363829us-gaap:EquityMethodInvesteeMemberus-gaap:ReinsurerConcentrationRiskMemberesgr:LloydsSyndicateMember2021-03-310001363829us-gaap:EquityMethodInvesteeMemberus-gaap:ReinsurerConcentrationRiskMemberesgr:LloydsSyndicateMember2020-12-310001363829us-gaap:EquityMethodInvesteeMemberus-gaap:ReinsurerConcentrationRiskMemberesgr:MichiganCatastrophicClaimsAssociationsMember2021-03-310001363829us-gaap:EquityMethodInvesteeMemberus-gaap:ReinsurerConcentrationRiskMemberesgr:MichiganCatastrophicClaimsAssociationsMember2020-12-310001363829us-gaap:ReinsurerConcentrationRiskMemberus-gaap:ReinsuranceRecoverableMemberesgr:TopTenReinsurersNonRatedReinsurersUSStateBackedMember2021-03-310001363829us-gaap:ReinsurerConcentrationRiskMemberus-gaap:ReinsuranceRecoverableMemberesgr:TopTenReinsurersNonRatedReinsurersUSStateBackedMember2020-12-310001363829esgr:TopTenReinsurersNonRatedReinsurersProvidedSecurityMemberus-gaap:ReinsurerConcentrationRiskMemberus-gaap:ReinsuranceRecoverableMember2021-03-310001363829esgr:TopTenReinsurersNonRatedReinsurersProvidedSecurityMemberus-gaap:ReinsurerConcentrationRiskMemberus-gaap:ReinsuranceRecoverableMember2020-12-310001363829us-gaap:ReinsurerConcentrationRiskMemberus-gaap:ReinsuranceRecoverableMemberesgr:TopTenReinsurersNonRatedReinsurersProvidedSecurityReinsurerTwoMember2021-03-310001363829us-gaap:ReinsurerConcentrationRiskMemberus-gaap:ReinsuranceRecoverableMemberesgr:TopTenReinsurersNonRatedReinsurersProvidedSecurityReinsurerTwoMember2020-12-310001363829esgr:ReinsurersRatedAMinusOrAboveMember2021-03-310001363829esgr:ReinsurersRatedBelowAMinusMemberus-gaap:CededCreditRiskSecuredMember2021-03-310001363829esgr:ReinsurersRatedBelowAMinusMemberus-gaap:CededCreditRiskUnsecuredMember2021-03-310001363829esgr:ReinsurersRatedAMinusOrAboveMember2020-12-310001363829esgr:ReinsurersRatedBelowAMinusMemberus-gaap:CededCreditRiskSecuredMember2020-12-310001363829esgr:ReinsurersRatedBelowAMinusMemberus-gaap:CededCreditRiskUnsecuredMember2020-12-310001363829esgr:RunOffMemberus-gaap:OperatingSegmentsMember2021-03-310001363829esgr:LegacyUnderwritingSegmentMemberus-gaap:OperatingSegmentsMember2021-03-310001363829esgr:RunOffMemberus-gaap:OperatingSegmentsMember2020-12-310001363829esgr:LegacyUnderwritingSegmentMemberus-gaap:OperatingSegmentsMember2020-12-310001363829esgr:RunOffMemberus-gaap:OperatingSegmentsMember2021-01-012021-03-310001363829esgr:LegacyUnderwritingSegmentMemberus-gaap:OperatingSegmentsMember2021-01-012021-03-310001363829us-gaap:CorporateNonSegmentMember2021-01-012021-03-310001363829esgr:RunOffMemberus-gaap:OperatingSegmentsMember2020-01-012020-03-310001363829esgr:LegacyUnderwritingSegmentMemberus-gaap:OperatingSegmentsMember2020-01-012020-03-310001363829us-gaap:CorporateNonSegmentMember2020-01-012020-03-310001363829esgr:RunOffMember2019-12-310001363829srt:CumulativeEffectPeriodOfAdoptionAdjustmentMemberesgr:RunOffMember2020-12-310001363829srt:CumulativeEffectPeriodOfAdoptionAdjustmentMemberesgr:RunOffMember2019-12-310001363829esgr:RunOffMember2021-01-012021-03-310001363829esgr:RunOffMember2020-01-012020-03-310001363829esgr:RunOffMember2020-03-310001363829esgr:LegacyUnderwritingSegmentMember2019-12-310001363829esgr:LegacyUnderwritingSegmentMembersrt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2020-12-310001363829esgr:LegacyUnderwritingSegmentMembersrt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2019-12-310001363829esgr:LegacyUnderwritingSegmentMember2021-01-012021-03-310001363829esgr:LegacyUnderwritingSegmentMember2020-01-012020-03-310001363829esgr:LegacyUnderwritingSegmentMember2020-03-310001363829esgr:LegacyUnderwritingSegmentMemberesgr:COVID19Member2020-01-012020-03-310001363829esgr:DefendantAsbestosLiabilitiesMember2021-03-310001363829esgr:DefendantAsbestosLiabilitiesMember2020-12-310001363829esgr:DefendantEnvironmentalLiabilitiesMember2021-03-310001363829esgr:DefendantEnvironmentalLiabilitiesMember2020-12-310001363829srt:CumulativeEffectPeriodOfAdoptionAdjustedBalanceMember2020-12-310001363829srt:CumulativeEffectPeriodOfAdoptionAdjustedBalanceMember2019-12-310001363829us-gaap:USGovernmentAgenciesDebtSecuritiesMemberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-03-310001363829us-gaap:FairValueInputsLevel2Memberus-gaap:USGovernmentAgenciesDebtSecuritiesMemberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829us-gaap:FairValueInputsLevel3Memberus-gaap:USGovernmentAgenciesDebtSecuritiesMemberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829us-gaap:USGovernmentAgenciesDebtSecuritiesMemberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829esgr:UnitedKingdomGovernmentAgenciesDebtSecuritiesMemberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-03-310001363829esgr:UnitedKingdomGovernmentAgenciesDebtSecuritiesMemberus-gaap:FairValueInputsLevel2Memberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829esgr:UnitedKingdomGovernmentAgenciesDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829esgr:UnitedKingdomGovernmentAgenciesDebtSecuritiesMemberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829esgr:DebtSecurityGovernmentOtherMemberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-03-310001363829us-gaap:FairValueInputsLevel2Memberesgr:DebtSecurityGovernmentOtherMemberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829esgr:DebtSecurityGovernmentOtherMemberus-gaap:FairValueInputsLevel3Memberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829esgr:DebtSecurityGovernmentOtherMemberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829us-gaap:CorporateDebtSecuritiesMemberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-03-310001363829us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueInputsLevel2Memberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829us-gaap:CorporateDebtSecuritiesMemberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829us-gaap:MunicipalBondsMemberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-03-310001363829us-gaap:MunicipalBondsMemberus-gaap:FairValueInputsLevel2Memberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829us-gaap:MunicipalBondsMemberus-gaap:FairValueInputsLevel3Memberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829us-gaap:MunicipalBondsMemberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829us-gaap:ResidentialMortgageBackedSecuritiesMemberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-03-310001363829us-gaap:ResidentialMortgageBackedSecuritiesMemberus-gaap:FairValueInputsLevel2Memberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829us-gaap:ResidentialMortgageBackedSecuritiesMemberus-gaap:FairValueInputsLevel3Memberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829us-gaap:ResidentialMortgageBackedSecuritiesMemberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829us-gaap:CommercialMortgageBackedSecuritiesMemberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-03-310001363829us-gaap:CommercialMortgageBackedSecuritiesMemberus-gaap:FairValueInputsLevel2Memberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829us-gaap:CommercialMortgageBackedSecuritiesMemberus-gaap:FairValueInputsLevel3Memberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829us-gaap:CommercialMortgageBackedSecuritiesMemberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829us-gaap:AssetBackedSecuritiesMemberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-03-310001363829us-gaap:AssetBackedSecuritiesMemberus-gaap:FairValueInputsLevel2Memberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829us-gaap:AssetBackedSecuritiesMemberus-gaap:FairValueInputsLevel3Memberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829us-gaap:AssetBackedSecuritiesMemberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829esgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-03-310001363829us-gaap:FairValueInputsLevel2Memberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829us-gaap:FairValueInputsLevel3Memberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829esgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829esgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMemberesgr:FundsHeldDirectlyManagedMemberus-gaap:FairValueInputsLevel1Member2021-03-310001363829us-gaap:FairValueInputsLevel2Memberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMemberesgr:FundsHeldDirectlyManagedMember2021-03-310001363829us-gaap:FairValueInputsLevel3Memberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMemberesgr:FundsHeldDirectlyManagedMember2021-03-310001363829esgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMemberesgr:FundsHeldDirectlyManagedMember2021-03-310001363829esgr:PublicEquityFundsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-03-310001363829esgr:PublicEquityFundsMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829esgr:PublicEquityFundsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829esgr:PublicEquityFundsMemberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829us-gaap:ExchangeTradedFundsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-03-310001363829us-gaap:ExchangeTradedFundsMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829us-gaap:ExchangeTradedFundsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829us-gaap:ExchangeTradedFundsMemberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829us-gaap:PrivateEquityFundsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-03-310001363829us-gaap:PrivateEquityFundsMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829us-gaap:PrivateEquityFundsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829us-gaap:PrivateEquityFundsMemberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-03-310001363829us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829us-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829esgr:HedgeFundsFixedIncomeMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:OtherInvestmentsMember2021-03-310001363829esgr:HedgeFundsFixedIncomeMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2021-03-310001363829esgr:HedgeFundsFixedIncomeMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2021-03-310001363829esgr:HedgeFundsFixedIncomeMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2021-03-310001363829esgr:HedgeFundsFixedIncomeMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2021-03-310001363829us-gaap:FixedIncomeFundsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:OtherInvestmentsMember2021-03-310001363829us-gaap:FixedIncomeFundsMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2021-03-310001363829us-gaap:FixedIncomeFundsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2021-03-310001363829us-gaap:FixedIncomeFundsMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2021-03-310001363829us-gaap:FixedIncomeFundsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2021-03-310001363829us-gaap:EquityFundsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:OtherInvestmentsMember2021-03-310001363829us-gaap:FairValueInputsLevel2Memberus-gaap:EquityFundsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2021-03-310001363829us-gaap:EquityFundsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2021-03-310001363829us-gaap:EquityFundsMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2021-03-310001363829us-gaap:EquityFundsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2021-03-310001363829us-gaap:PrivateEquityFundsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:OtherInvestmentsMember2021-03-310001363829us-gaap:PrivateEquityFundsMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2021-03-310001363829us-gaap:PrivateEquityFundsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2021-03-310001363829us-gaap:PrivateEquityFundsMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2021-03-310001363829us-gaap:PrivateEquityFundsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2021-03-310001363829esgr:CLOEquityMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:OtherInvestmentsMember2021-03-310001363829us-gaap:FairValueInputsLevel2Memberesgr:CLOEquityMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2021-03-310001363829esgr:CLOEquityMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2021-03-310001363829esgr:CLOEquityMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2021-03-310001363829esgr:CLOEquityMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2021-03-310001363829esgr:CLOEquityFundsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:OtherInvestmentsMember2021-03-310001363829esgr:CLOEquityFundsMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2021-03-310001363829esgr:CLOEquityFundsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2021-03-310001363829esgr:CLOEquityFundsMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2021-03-310001363829esgr:CLOEquityFundsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2021-03-310001363829esgr:PrivateCreditFundsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:OtherInvestmentsMember2021-03-310001363829esgr:PrivateCreditFundsMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2021-03-310001363829esgr:PrivateCreditFundsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2021-03-310001363829esgr:PrivateCreditFundsMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2021-03-310001363829esgr:PrivateCreditFundsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2021-03-310001363829esgr:OtherInvestmentsatFairValueMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:OtherInvestmentsMember2021-03-310001363829esgr:OtherInvestmentsatFairValueMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2021-03-310001363829esgr:OtherInvestmentsatFairValueMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2021-03-310001363829esgr:OtherInvestmentsatFairValueMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2021-03-310001363829esgr:OtherInvestmentsatFairValueMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2021-03-310001363829us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:OtherInvestmentsMember2021-03-310001363829us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2021-03-310001363829us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2021-03-310001363829us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2021-03-310001363829us-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2021-03-310001363829us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829us-gaap:ReinsuranceRecoverableForPaidAndUnpaidClaimsAndClaimsAdjustmentsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-03-310001363829us-gaap:ReinsuranceRecoverableForPaidAndUnpaidClaimsAndClaimsAdjustmentsMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829us-gaap:ReinsuranceRecoverableForPaidAndUnpaidClaimsAndClaimsAdjustmentsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829us-gaap:ReinsuranceRecoverableForPaidAndUnpaidClaimsAndClaimsAdjustmentsMemberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:DerivativeFinancialInstrumentsAssetsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-03-310001363829us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:DerivativeFinancialInstrumentsAssetsMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:DerivativeFinancialInstrumentsAssetsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:DerivativeFinancialInstrumentsAssetsMemberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829us-gaap:DerivativeFinancialInstrumentsAssetsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:NondesignatedMember2021-03-310001363829us-gaap:DerivativeFinancialInstrumentsAssetsMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:NondesignatedMember2021-03-310001363829us-gaap:DerivativeFinancialInstrumentsAssetsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:NondesignatedMember2021-03-310001363829us-gaap:DerivativeFinancialInstrumentsAssetsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:NondesignatedMember2021-03-310001363829us-gaap:DerivativeFinancialInstrumentsAssetsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-03-310001363829us-gaap:DerivativeFinancialInstrumentsAssetsMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829us-gaap:DerivativeFinancialInstrumentsAssetsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829us-gaap:DerivativeFinancialInstrumentsAssetsMemberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829us-gaap:DerivativeFinancialInstrumentsLiabilitiesMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-03-310001363829us-gaap:DerivativeFinancialInstrumentsLiabilitiesMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829us-gaap:DerivativeFinancialInstrumentsLiabilitiesMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829us-gaap:DerivativeFinancialInstrumentsLiabilitiesMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829us-gaap:DerivativeFinancialInstrumentsLiabilitiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:NondesignatedMember2021-03-310001363829us-gaap:DerivativeFinancialInstrumentsLiabilitiesMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:NondesignatedMember2021-03-310001363829us-gaap:DerivativeFinancialInstrumentsLiabilitiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:NondesignatedMember2021-03-310001363829us-gaap:DerivativeFinancialInstrumentsLiabilitiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:NondesignatedMember2021-03-310001363829us-gaap:DerivativeFinancialInstrumentsLiabilitiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-03-310001363829us-gaap:DerivativeFinancialInstrumentsLiabilitiesMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829us-gaap:DerivativeFinancialInstrumentsLiabilitiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829us-gaap:DerivativeFinancialInstrumentsLiabilitiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-03-310001363829us-gaap:USGovernmentAgenciesDebtSecuritiesMemberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-12-310001363829us-gaap:FairValueInputsLevel2Memberus-gaap:USGovernmentAgenciesDebtSecuritiesMemberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829us-gaap:FairValueInputsLevel3Memberus-gaap:USGovernmentAgenciesDebtSecuritiesMemberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829us-gaap:USGovernmentAgenciesDebtSecuritiesMemberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829esgr:UnitedKingdomGovernmentAgenciesDebtSecuritiesMemberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-12-310001363829esgr:UnitedKingdomGovernmentAgenciesDebtSecuritiesMemberus-gaap:FairValueInputsLevel2Memberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829esgr:UnitedKingdomGovernmentAgenciesDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829esgr:UnitedKingdomGovernmentAgenciesDebtSecuritiesMemberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829esgr:DebtSecurityGovernmentOtherMemberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-12-310001363829us-gaap:FairValueInputsLevel2Memberesgr:DebtSecurityGovernmentOtherMemberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829esgr:DebtSecurityGovernmentOtherMemberus-gaap:FairValueInputsLevel3Memberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829esgr:DebtSecurityGovernmentOtherMemberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829us-gaap:CorporateDebtSecuritiesMemberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-12-310001363829us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueInputsLevel2Memberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829us-gaap:CorporateDebtSecuritiesMemberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829us-gaap:MunicipalBondsMemberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-12-310001363829us-gaap:MunicipalBondsMemberus-gaap:FairValueInputsLevel2Memberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829us-gaap:MunicipalBondsMemberus-gaap:FairValueInputsLevel3Memberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829us-gaap:MunicipalBondsMemberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829us-gaap:ResidentialMortgageBackedSecuritiesMemberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-12-310001363829us-gaap:ResidentialMortgageBackedSecuritiesMemberus-gaap:FairValueInputsLevel2Memberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829us-gaap:ResidentialMortgageBackedSecuritiesMemberus-gaap:FairValueInputsLevel3Memberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829us-gaap:ResidentialMortgageBackedSecuritiesMemberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829us-gaap:CommercialMortgageBackedSecuritiesMemberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-12-310001363829us-gaap:CommercialMortgageBackedSecuritiesMemberus-gaap:FairValueInputsLevel2Memberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829us-gaap:CommercialMortgageBackedSecuritiesMemberus-gaap:FairValueInputsLevel3Memberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829us-gaap:CommercialMortgageBackedSecuritiesMemberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829us-gaap:AssetBackedSecuritiesMemberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-12-310001363829us-gaap:AssetBackedSecuritiesMemberus-gaap:FairValueInputsLevel2Memberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829us-gaap:AssetBackedSecuritiesMemberus-gaap:FairValueInputsLevel3Memberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829us-gaap:AssetBackedSecuritiesMemberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829esgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-12-310001363829us-gaap:FairValueInputsLevel2Memberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829us-gaap:FairValueInputsLevel3Memberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829esgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829esgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMemberesgr:FundsHeldDirectlyManagedMemberus-gaap:FairValueInputsLevel1Member2020-12-310001363829us-gaap:FairValueInputsLevel2Memberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMemberesgr:FundsHeldDirectlyManagedMember2020-12-310001363829us-gaap:FairValueInputsLevel3Memberesgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMemberesgr:FundsHeldDirectlyManagedMember2020-12-310001363829esgr:ShortTermInvestmentsAndFixedMaturitiesMemberus-gaap:FairValueMeasurementsRecurringMemberesgr:FundsHeldDirectlyManagedMember2020-12-310001363829esgr:PublicEquityFundsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-12-310001363829esgr:PublicEquityFundsMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829esgr:PublicEquityFundsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829esgr:PublicEquityFundsMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829us-gaap:ExchangeTradedFundsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-12-310001363829us-gaap:ExchangeTradedFundsMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829us-gaap:ExchangeTradedFundsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829us-gaap:ExchangeTradedFundsMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829us-gaap:PrivateEquityFundsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-12-310001363829us-gaap:PrivateEquityFundsMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829us-gaap:PrivateEquityFundsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829us-gaap:PrivateEquityFundsMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-12-310001363829us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829us-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829esgr:HedgeFundsFixedIncomeMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:OtherInvestmentsMember2020-12-310001363829esgr:HedgeFundsFixedIncomeMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2020-12-310001363829esgr:HedgeFundsFixedIncomeMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2020-12-310001363829esgr:HedgeFundsFixedIncomeMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2020-12-310001363829esgr:HedgeFundsFixedIncomeMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2020-12-310001363829us-gaap:FixedIncomeFundsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:OtherInvestmentsMember2020-12-310001363829us-gaap:FixedIncomeFundsMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2020-12-310001363829us-gaap:FixedIncomeFundsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2020-12-310001363829us-gaap:FixedIncomeFundsMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2020-12-310001363829us-gaap:FixedIncomeFundsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2020-12-310001363829us-gaap:EquityFundsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:OtherInvestmentsMember2020-12-310001363829us-gaap:FairValueInputsLevel2Memberus-gaap:EquityFundsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2020-12-310001363829us-gaap:EquityFundsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2020-12-310001363829us-gaap:EquityFundsMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2020-12-310001363829us-gaap:EquityFundsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2020-12-310001363829us-gaap:PrivateEquityFundsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:OtherInvestmentsMember2020-12-310001363829us-gaap:PrivateEquityFundsMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2020-12-310001363829us-gaap:PrivateEquityFundsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2020-12-310001363829us-gaap:PrivateEquityFundsMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2020-12-310001363829us-gaap:PrivateEquityFundsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2020-12-310001363829esgr:CLOEquityMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:OtherInvestmentsMember2020-12-310001363829us-gaap:FairValueInputsLevel2Memberesgr:CLOEquityMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2020-12-310001363829esgr:CLOEquityMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2020-12-310001363829esgr:CLOEquityMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2020-12-310001363829esgr:CLOEquityMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2020-12-310001363829esgr:CLOEquityFundsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:OtherInvestmentsMember2020-12-310001363829esgr:CLOEquityFundsMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2020-12-310001363829esgr:CLOEquityFundsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2020-12-310001363829esgr:CLOEquityFundsMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2020-12-310001363829esgr:CLOEquityFundsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2020-12-310001363829esgr:PrivateCreditFundsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:OtherInvestmentsMember2020-12-310001363829esgr:PrivateCreditFundsMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2020-12-310001363829esgr:PrivateCreditFundsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2020-12-310001363829esgr:PrivateCreditFundsMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2020-12-310001363829esgr:PrivateCreditFundsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2020-12-310001363829esgr:OtherInvestmentsatFairValueMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:OtherInvestmentsMember2020-12-310001363829esgr:OtherInvestmentsatFairValueMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2020-12-310001363829esgr:OtherInvestmentsatFairValueMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2020-12-310001363829esgr:OtherInvestmentsatFairValueMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2020-12-310001363829esgr:OtherInvestmentsatFairValueMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2020-12-310001363829us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:OtherInvestmentsMember2020-12-310001363829us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2020-12-310001363829us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2020-12-310001363829us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2020-12-310001363829us-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2020-12-310001363829us-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829us-gaap:ReinsuranceRecoverableForPaidAndUnpaidClaimsAndClaimsAdjustmentsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-12-310001363829us-gaap:ReinsuranceRecoverableForPaidAndUnpaidClaimsAndClaimsAdjustmentsMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829us-gaap:ReinsuranceRecoverableForPaidAndUnpaidClaimsAndClaimsAdjustmentsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829us-gaap:ReinsuranceRecoverableForPaidAndUnpaidClaimsAndClaimsAdjustmentsMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:DerivativeFinancialInstrumentsAssetsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-12-310001363829us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:DerivativeFinancialInstrumentsAssetsMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:DerivativeFinancialInstrumentsAssetsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:DerivativeFinancialInstrumentsAssetsMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829us-gaap:DerivativeFinancialInstrumentsAssetsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:NondesignatedMember2020-12-310001363829us-gaap:DerivativeFinancialInstrumentsAssetsMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:NondesignatedMember2020-12-310001363829us-gaap:DerivativeFinancialInstrumentsAssetsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:NondesignatedMember2020-12-310001363829us-gaap:DerivativeFinancialInstrumentsAssetsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:NondesignatedMember2020-12-310001363829us-gaap:DerivativeFinancialInstrumentsAssetsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-12-310001363829us-gaap:DerivativeFinancialInstrumentsAssetsMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829us-gaap:DerivativeFinancialInstrumentsAssetsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829us-gaap:DerivativeFinancialInstrumentsAssetsMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829us-gaap:DerivativeFinancialInstrumentsLiabilitiesMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-12-310001363829us-gaap:DerivativeFinancialInstrumentsLiabilitiesMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829us-gaap:DerivativeFinancialInstrumentsLiabilitiesMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829us-gaap:DerivativeFinancialInstrumentsLiabilitiesMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829us-gaap:DerivativeFinancialInstrumentsLiabilitiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:NondesignatedMember2020-12-310001363829us-gaap:DerivativeFinancialInstrumentsLiabilitiesMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:NondesignatedMember2020-12-310001363829us-gaap:DerivativeFinancialInstrumentsLiabilitiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:NondesignatedMember2020-12-310001363829us-gaap:DerivativeFinancialInstrumentsLiabilitiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:NondesignatedMember2020-12-310001363829us-gaap:DerivativeFinancialInstrumentsLiabilitiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-12-310001363829us-gaap:DerivativeFinancialInstrumentsLiabilitiesMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829us-gaap:DerivativeFinancialInstrumentsLiabilitiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829us-gaap:DerivativeFinancialInstrumentsLiabilitiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310001363829us-gaap:EquitySecuritiesMember2020-12-310001363829us-gaap:OtherInvestmentsMember2020-12-310001363829us-gaap:EquitySecuritiesMember2019-12-310001363829us-gaap:OtherInvestmentsMember2019-12-310001363829us-gaap:EquitySecuritiesMember2021-03-310001363829us-gaap:EquitySecuritiesMember2020-03-310001363829us-gaap:OtherInvestmentsMember2020-03-310001363829us-gaap:PrivateEquityFundsMemberus-gaap:FairValueInputsLevel3Memberesgr:ValuationTechniqueGuidelineCompanyMethodologyMember2021-03-310001363829us-gaap:PrivateEquityFundsMemberesgr:MeasurementInputDistributionWaterfallMemberus-gaap:FairValueInputsLevel3Memberesgr:ValuationTechniqueGuidelineCompanyMethodologyMember2021-03-310001363829us-gaap:PrivateEquityFundsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:CostApproachValuationTechniqueMember2021-03-310001363829us-gaap:PrivateEquityFundsMemberus-gaap:FairValueInputsLevel3Memberesgr:ValuationNetAssetValueMember2021-03-310001363829us-gaap:PrivateEquityFundsMemberesgr:MeasurementInputRecentTransactionValueMemberus-gaap:FairValueInputsLevel3Memberesgr:ValuationNetAssetValueMember2021-03-310001363829us-gaap:PrivateEquityFundsMemberus-gaap:FairValueInputsLevel3Member2021-03-310001363829esgr:LossesAndLossAdjustmentExpenseLiabilitiesMember2020-12-310001363829us-gaap:ReinsuranceRecoverableMember2020-12-310001363829esgr:LossesAndLossAdjustmentExpenseLiabilitiesMember2019-12-310001363829us-gaap:ReinsuranceRecoverableMember2019-12-310001363829esgr:LossesAndLossAdjustmentExpenseLiabilitiesMember2021-01-012021-03-310001363829us-gaap:ReinsuranceRecoverableMember2021-01-012021-03-310001363829esgr:LossesAndLossAdjustmentExpenseLiabilitiesMember2020-01-012020-03-310001363829us-gaap:ReinsuranceRecoverableMember2020-01-012020-03-310001363829esgr:LossesAndLossAdjustmentExpenseLiabilitiesMember2021-03-310001363829us-gaap:ReinsuranceRecoverableMember2021-03-310001363829esgr:LossesAndLossAdjustmentExpenseLiabilitiesMember2020-03-310001363829us-gaap:ReinsuranceRecoverableMember2020-03-310001363829esgr:MeasurementInputDurationMember2021-01-012021-03-310001363829esgr:MeasurementInputDurationMember2020-01-012020-03-310001363829esgr:MeasurementInputCorporateBondYieldMember2021-01-012021-03-310001363829esgr:MeasurementInputCorporateBondYieldMember2020-01-012020-03-310001363829esgr:MeasurementInputWeightedAverageCostOfCapitalMember2021-01-012021-03-310001363829esgr:MeasurementInputWeightedAverageCostOfCapitalMember2020-01-012020-03-310001363829esgr:MeasurementInputRiskCostOfCapitalMember2021-01-012021-03-310001363829esgr:MeasurementInputRiskCostOfCapitalMember2020-01-012020-03-310001363829us-gaap:MeasurementInputEntityCreditRiskMemberesgr:LossesAndLossAdjustmentExpenseLiabilitiesMemberus-gaap:FairValueMeasurementsRecurringMemberesgr:InternalModelMember2021-01-012021-03-310001363829us-gaap:MeasurementInputEntityCreditRiskMemberesgr:LossesAndLossAdjustmentExpenseLiabilitiesMemberus-gaap:FairValueMeasurementsRecurringMemberesgr:InternalModelMember2020-01-012020-06-300001363829us-gaap:ReinsuranceRecoverableMemberus-gaap:FairValueMeasurementsRecurringMemberesgr:InternalModelMember2021-01-012021-03-310001363829us-gaap:ReinsuranceRecoverableMemberus-gaap:FairValueMeasurementsRecurringMemberesgr:InternalModelMember2020-01-012020-06-300001363829esgr:LossesAndLossAdjustmentExpenseLiabilitiesMemberus-gaap:FairValueMeasurementsRecurringMemberesgr:InternalModelMember2021-01-012021-03-310001363829esgr:LossesAndLossAdjustmentExpenseLiabilitiesMemberus-gaap:FairValueMeasurementsRecurringMemberesgr:InternalModelMember2020-01-012020-06-300001363829esgr:SeniorNotesDue2022Memberus-gaap:SeniorNotesMember2021-03-310001363829esgr:SeniorNotesDue2029Memberus-gaap:SeniorNotesMember2021-03-310001363829esgr:JuniorSubordinatedNotesDue2040Memberus-gaap:JuniorSubordinatedDebtMember2021-03-310001363829esgr:SeniorNotesDue2022Memberus-gaap:SeniorNotesMember2021-01-012021-03-310001363829esgr:SeniorNotesDue2022Memberus-gaap:SeniorNotesMember2020-12-310001363829esgr:SeniorNotesDue2029Memberus-gaap:SeniorNotesMember2021-01-012021-03-310001363829esgr:SeniorNotesDue2029Memberus-gaap:SeniorNotesMember2020-12-310001363829us-gaap:SeniorNotesMember2021-03-310001363829us-gaap:SeniorNotesMember2020-12-310001363829esgr:JuniorSubordinatedNotesDue2040Memberus-gaap:JuniorSubordinatedDebtMember2021-01-012021-03-310001363829esgr:JuniorSubordinatedNotesDue2040Memberus-gaap:JuniorSubordinatedDebtMember2020-12-310001363829esgr:A2018EGLRevolvingCreditFacilityMemberus-gaap:LineOfCreditMember2021-01-012021-03-310001363829esgr:A2018EGLRevolvingCreditFacilityMemberus-gaap:LineOfCreditMember2021-03-310001363829esgr:A2018EGLRevolvingCreditFacilityMemberus-gaap:LineOfCreditMember2020-12-310001363829esgr:SeniorNotesDue2022Memberus-gaap:SeniorNotesMember2017-03-100001363829esgr:SeniorNotesDue2029Memberus-gaap:SeniorNotesMember2019-05-280001363829esgr:JuniorSubordinatedNotesDue2040Membersrt:ScenarioForecastMemberus-gaap:UsTreasuryUstInterestRateMemberus-gaap:JuniorSubordinatedDebtMember2025-09-012025-09-010001363829esgr:JuniorSubordinatedNotesDue2040Memberus-gaap:JuniorSubordinatedDebtMember2020-08-260001363829us-gaap:SubsequentEventMemberesgr:A2018EGLRevolvingCreditFacilityMemberus-gaap:LineOfCreditMember2021-05-070001363829us-gaap:LineOfCreditMemberesgr:FALFacilityMemberus-gaap:LetterOfCreditMember2021-03-310001363829us-gaap:LineOfCreditMemberesgr:FALFacilityMemberus-gaap:LetterOfCreditMember2020-12-310001363829esgr:DepositFacilityMemberus-gaap:SubsequentEventMemberus-gaap:LineOfCreditMemberesgr:FALDepositFacilityMember2021-05-060001363829us-gaap:LineOfCreditMemberesgr:A2018FacilityAgreementMemberus-gaap:LetterOfCreditMember2021-03-310001363829us-gaap:LineOfCreditMemberesgr:A2018FacilityAgreementMemberus-gaap:LetterOfCreditMember2020-12-310001363829us-gaap:LineOfCreditMemberesgr:MaidenFacilityAgreementMemberus-gaap:LetterOfCreditMember2021-03-310001363829us-gaap:LineOfCreditMemberesgr:MaidenFacilityAgreementMemberus-gaap:LetterOfCreditMember2020-12-310001363829us-gaap:LineOfCreditMemberesgr:MaidenFacilityAgreementMemberus-gaap:LetterOfCreditMembersrt:ScenarioPreviouslyReportedMember2020-12-310001363829us-gaap:LineOfCreditMemberesgr:A2020LetterOfCreditFacilityMemberus-gaap:LetterOfCreditMember2021-03-310001363829us-gaap:LineOfCreditMemberesgr:A2020LetterOfCreditFacilityMemberus-gaap:LetterOfCreditMember2020-12-310001363829esgr:CavelloLetterOfCreditFacilityMemberus-gaap:LineOfCreditMemberus-gaap:LetterOfCreditMember2021-03-31iso4217:GBP0001363829esgr:MercantileLetterOfCreditFacilityMemberus-gaap:LineOfCreditMemberus-gaap:LetterOfCreditMember2021-03-310001363829esgr:MercantileLetterOfCreditFacilityMemberus-gaap:LineOfCreditMemberus-gaap:LetterOfCreditMember2020-12-310001363829srt:SubsidiariesMemberesgr:NorthBayMemberesgr:TridentMember2020-12-310001363829srt:SubsidiariesMemberesgr:NorthBayMemberesgr:DowlingMember2020-12-3100013638292021-02-250001363829us-gaap:CommonClassCMember2021-01-012021-03-310001363829us-gaap:SeriesDPreferredStockMember2020-01-012020-03-310001363829us-gaap:SeriesEPreferredStockMember2020-01-012020-03-310001363829us-gaap:SeriesDPreferredStockMemberus-gaap:SubsequentEventMember2021-05-052021-05-050001363829us-gaap:SubsequentEventMemberus-gaap:SeriesEPreferredStockMember2021-05-052021-05-050001363829us-gaap:AccumulatedNetInvestmentGainLossIncludingPortionAttributableToNoncontrollingInterestMember2021-01-012021-03-310001363829us-gaap:AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember2021-01-012021-03-310001363829us-gaap:AccumulatedDefinedBenefitPlansAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember2021-01-012021-03-310001363829us-gaap:AociIncludingPortionAttributableToNoncontrollingInterestMember2021-01-012021-03-310001363829us-gaap:AccumulatedNetInvestmentGainLossAttributableToNoncontrollingInterestMember2021-01-012021-03-310001363829us-gaap:AccumulatedForeignCurrencyAdjustmentAttributableToNoncontrollingInterestMember2021-01-012021-03-310001363829us-gaap:AccumulatedDefinedBenefitPlansAdjustmentAttributableToNoncontrollingInterestMember2021-01-012021-03-310001363829us-gaap:AociAttributableToNoncontrollingInterestMember2021-01-012021-03-310001363829us-gaap:AccumulatedNetInvestmentGainLossIncludingPortionAttributableToNoncontrollingInterestMember2020-01-012020-03-310001363829us-gaap:AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember2020-01-012020-03-310001363829us-gaap:AccumulatedDefinedBenefitPlansAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember2020-01-012020-03-310001363829us-gaap:AociIncludingPortionAttributableToNoncontrollingInterestMember2020-01-012020-03-310001363829us-gaap:AccumulatedNetInvestmentGainLossAttributableToNoncontrollingInterestMember2020-01-012020-03-310001363829us-gaap:AccumulatedForeignCurrencyAdjustmentAttributableToNoncontrollingInterestMember2020-01-012020-03-310001363829us-gaap:AccumulatedDefinedBenefitPlansAdjustmentAttributableToNoncontrollingInterestMember2020-01-012020-03-310001363829us-gaap:AociAttributableToNoncontrollingInterestMember2020-01-012020-03-310001363829us-gaap:AccumulatedNetInvestmentGainLossIncludingPortionAttributableToNoncontrollingInterestMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2021-01-012021-03-310001363829us-gaap:AccumulatedNetInvestmentGainLossIncludingPortionAttributableToNoncontrollingInterestMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2020-01-012020-03-310001363829us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2021-01-012021-03-310001363829us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2020-01-012020-03-310001363829esgr:RestrictedStockandRestrictedStockUnitsMember2021-01-012021-03-310001363829esgr:RestrictedStockandRestrictedStockUnitsMember2020-01-012020-03-310001363829us-gaap:PerformanceSharesMember2021-01-012021-03-310001363829us-gaap:PerformanceSharesMember2020-01-012020-03-310001363829us-gaap:StockAppreciationRightsSARSMember2021-01-012021-03-310001363829us-gaap:StockAppreciationRightsSARSMember2020-01-012020-03-310001363829esgr:EmployeeStockPurchasePlanMemberus-gaap:EmployeeStockMember2021-01-012021-03-310001363829esgr:EmployeeStockPurchasePlanMemberus-gaap:EmployeeStockMember2020-01-012020-03-310001363829esgr:TimeBasedRestrictedStockMemberesgr:LongTermIncentivePlansMember2021-01-012021-03-310001363829esgr:TimeBasedRestrictedStockMemberesgr:LongTermIncentivePlansMember2020-01-012020-03-310001363829esgr:StarStoneLongTermIncentivePlanMemberesgr:TimeBasedRestrictedStockMember2021-01-012021-03-310001363829esgr:StarStoneLongTermIncentivePlanMemberesgr:TimeBasedRestrictedStockMember2020-01-012020-03-310001363829esgr:DeferredCompensationPlanMember2021-01-012021-03-310001363829esgr:DeferredCompensationPlanMember2020-01-012020-03-310001363829us-gaap:EmployeeStockMember2021-01-012021-03-310001363829us-gaap:EmployeeStockMember2020-01-012020-03-310001363829srt:AffiliatedEntityMemberesgr:TridentMember2012-05-012012-07-310001363829esgr:StonePointMembersrt:AffiliatedEntityMember2021-03-31esgr:general_partner0001363829srt:AffiliatedEntityMemberesgr:TridentMember2013-11-060001363829esgr:NorthBayMemberesgr:DowlingMember2021-03-31esgr:director0001363829esgr:StarStoneSpecialtyHoldingsLimitedMember2021-03-310001363829esgr:StarStoneSpecialtyHoldingsLimitedMemberesgr:TridentMember2021-03-310001363829esgr:NorthshoreHoldingsLimitedMember2021-03-310001363829esgr:NorthshoreHoldingsLimitedMember2021-01-012021-03-310001363829esgr:NorthBayMemberesgr:NorthBayShareholdersMember2018-10-012018-10-010001363829esgr:NorthBayMemberesgr:TridentMember2018-10-012018-10-010001363829esgr:NorthBayMemberesgr:NorthBayShareholdersMember2019-04-012019-04-010001363829esgr:StarstoneMember2019-10-012019-10-0100013638292019-10-012019-10-010001363829srt:AffiliatedEntityMemberesgr:TridentMember2021-03-310001363829srt:AffiliatedEntityMemberesgr:TridentMember2020-12-310001363829esgr:MitchellInternationalMembersrt:AffiliatedEntityMember2018-12-310001363829esgr:SoundPointCapitalMemberus-gaap:SeniorLoansMembersrt:AffiliatedEntityMember2020-06-300001363829esgr:SoundPointCapitalMemberus-gaap:SeniorLoansMembersrt:AffiliatedEntityMember2020-04-012020-06-300001363829us-gaap:SubsequentEventMembersrt:AffiliatedEntityMemberesgr:TVIIICelestialCoInvestLPMember2021-04-290001363829esgr:StonePointAndAffiliatedEntitiesMemberus-gaap:ShortTermInvestmentsMember2021-03-310001363829esgr:StonePointAndAffiliatedEntitiesMemberus-gaap:ShortTermInvestmentsMember2020-12-310001363829esgr:StonePointAndAffiliatedEntitiesMemberus-gaap:FixedMaturitiesMember2021-03-310001363829esgr:StonePointAndAffiliatedEntitiesMemberus-gaap:FixedMaturitiesMember2020-12-310001363829esgr:StonePointAndAffiliatedEntitiesMember2021-03-310001363829esgr:StonePointAndAffiliatedEntitiesMember2020-12-310001363829us-gaap:HedgeFundsMemberesgr:StonePointAndAffiliatedEntitiesMember2021-03-310001363829us-gaap:HedgeFundsMemberesgr:StonePointAndAffiliatedEntitiesMember2020-12-310001363829esgr:StonePointAndAffiliatedEntitiesMemberus-gaap:FixedIncomeFundsMember2021-03-310001363829esgr:StonePointAndAffiliatedEntitiesMemberus-gaap:FixedIncomeFundsMember2020-12-310001363829us-gaap:PrivateEquityFundsMemberesgr:StonePointAndAffiliatedEntitiesMember2021-03-310001363829us-gaap:PrivateEquityFundsMemberesgr:StonePointAndAffiliatedEntitiesMember2020-12-310001363829esgr:StonePointAndAffiliatedEntitiesMemberesgr:CLOEquityMember2021-03-310001363829esgr:StonePointAndAffiliatedEntitiesMemberesgr:CLOEquityMember2020-12-310001363829esgr:StonePointAndAffiliatedEntitiesMemberesgr:CLOEquityFundsMember2021-03-310001363829esgr:StonePointAndAffiliatedEntitiesMemberesgr:CLOEquityFundsMember2020-12-310001363829esgr:StonePointAndAffiliatedEntitiesMemberesgr:PrivateDebtMember2021-03-310001363829esgr:StonePointAndAffiliatedEntitiesMemberesgr:PrivateDebtMember2020-12-310001363829us-gaap:RealEstateFundsMemberesgr:StonePointAndAffiliatedEntitiesMember2021-03-310001363829us-gaap:RealEstateFundsMemberesgr:StonePointAndAffiliatedEntitiesMember2020-12-310001363829esgr:StonePointAndAffiliatedEntitiesMember2021-01-012021-03-310001363829esgr:StonePointAndAffiliatedEntitiesMember2020-01-012020-03-310001363829esgr:HillhouseAffiliatesMembersrt:AffiliatedEntityMember2021-03-310001363829esgr:HillhouseMembersrt:AffiliatedEntityMemberesgr:InReFundMember2021-03-310001363829esgr:HillhouseMembersrt:AffiliatedEntityMemberesgr:InReFundMember2020-12-310001363829esgr:HillhouseMembersrt:AffiliatedEntityMember2020-01-012020-12-310001363829esgr:HillhouseMembersrt:AffiliatedEntityMembersrt:ScenarioPreviouslyReportedMember2020-01-012020-12-310001363829esgr:HillhouseMembersrt:AffiliatedEntityMember2021-02-210001363829esgr:HillhouseMembersrt:AffiliatedEntityMember2021-02-212021-02-210001363829esgr:HillhouseInReFundL.P.Membersrt:AffiliatedEntityMemberus-gaap:FixedIncomeSecuritiesMember2021-01-012021-03-310001363829esgr:NorthAmericanEquitiesMemberesgr:HillhouseInReFundL.P.Membersrt:AffiliatedEntityMember2021-01-012021-03-310001363829esgr:InternationalEquitiesMemberesgr:HillhouseInReFundL.P.Membersrt:AffiliatedEntityMember2021-01-012021-03-310001363829esgr:FinancingDerivativesAndOtherItemsMemberesgr:HillhouseInReFundL.P.Membersrt:AffiliatedEntityMember2021-01-012021-03-310001363829esgr:HillhouseMemberesgr:HillhouseAffiliatesMembersrt:AffiliatedEntityMember2021-03-310001363829esgr:HillhouseMemberesgr:HillhouseAffiliatesMembersrt:AffiliatedEntityMember2020-12-310001363829srt:AffiliatedEntityMember2021-03-310001363829srt:AffiliatedEntityMember2020-12-310001363829esgr:HillhouseMembersrt:AffiliatedEntityMember2021-03-310001363829esgr:HillhouseMembersrt:AffiliatedEntityMember2020-12-310001363829esgr:HillhouseMemberesgr:OtherFundsMembersrt:AffiliatedEntityMember2021-03-310001363829esgr:HillhouseMemberesgr:OtherFundsMembersrt:AffiliatedEntityMember2020-12-310001363829esgr:HillhouseMember2021-03-310001363829esgr:HillhouseMember2020-12-310001363829esgr:HillhouseMember2021-01-012021-03-310001363829esgr:HillhouseMember2020-01-012020-03-310001363829us-gaap:SubsequentEventMemberesgr:InReFundMember2021-04-300001363829esgr:NorthshoreHoldingsLimitedMember2021-01-010001363829esgr:NorthshoreHoldingsLimitedMember2020-12-310001363829esgr:NorthshoreHoldingsLimitedMemberesgr:TridentMember2020-12-310001363829srt:AffiliatedEntityMember2021-01-010001363829esgr:NorthshoreHoldingsLimitedMembersrt:AffiliatedEntityMember2021-03-310001363829esgr:NorthshoreHoldingsLimitedMembersrt:AffiliatedEntityMember2020-01-012020-03-310001363829us-gaap:ShortTermInvestmentsMemberesgr:AtriumSyndicate609Member2021-03-310001363829esgr:AtriumSyndicate609Memberus-gaap:FixedMaturitiesMember2021-03-310001363829esgr:AtriumSyndicate609Member2021-03-310001363829esgr:AtriumSyndicate609Member2021-01-012021-03-310001363829srt:AffiliatedEntityMemberesgr:ArdenMember2021-03-310001363829esgr:MonumentMember2016-10-012021-03-310001363829esgr:MonumentMember2016-10-012020-12-310001363829esgr:MonumentMember2021-01-012021-03-310001363829esgr:MonumentMember2020-01-012020-03-3100013638292017-01-010001363829us-gaap:EquityMethodInvesteeMemberesgr:ClearSpringMember2017-01-0100013638292020-12-302020-12-3000013638292020-10-012020-12-310001363829esgr:ClearSpringMember2020-01-012020-03-310001363829esgr:ClearSpringMemberesgr:StarstoneMember2017-01-012017-01-010001363829esgr:ClearSpringMember2017-01-012017-01-010001363829esgr:ClearSpringMemberesgr:StarstoneMembersrt:AffiliatedEntityMember2020-01-012020-03-310001363829esgr:ClearSpringMembersrt:AffiliatedEntityMember2020-01-012020-03-310001363829esgr:EvergreenParentL.P.Membersrt:AffiliatedEntityMember2018-11-012018-11-300001363829srt:AffiliatedEntityMemberesgr:AmTrustFinancialServicesInc.Member2018-11-300001363829esgr:EvergreenParentL.P.Membersrt:AffiliatedEntityMember2019-12-012019-12-310001363829esgr:EvergreenParentL.P.Membersrt:AffiliatedEntityMember2019-12-310001363829esgr:EvergreenParentL.P.Membersrt:AffiliatedEntityMemberesgr:TridentPineMember2019-12-310001363829esgr:EvergreenParentL.P.Membersrt:AffiliatedEntityMember2018-01-012018-12-310001363829srt:AffiliatedEntityMemberesgr:AmTrustFinancialServicesInc.Member2021-03-310001363829srt:AffiliatedEntityMemberesgr:AmTrustFinancialServicesInc.Member2020-12-310001363829srt:AffiliatedEntityMemberesgr:AmTrustFinancialServicesInc.Member2021-01-012021-03-310001363829srt:AffiliatedEntityMemberesgr:AmTrustFinancialServicesInc.Member2020-01-012020-03-310001363829esgr:CitcoIIILimitedMembersrt:AffiliatedEntityMemberesgr:TridentMember2018-06-012018-06-300001363829esgr:CitcoIIILimitedMembersrt:AffiliatedEntityMemberesgr:TridentMember2020-12-310001363829esgr:CitcoIIILimitedMembersrt:AffiliatedEntityMemberesgr:TridentMember2021-03-310001363829esgr:CitcoIIILimitedMember2021-01-012021-03-310001363829esgr:CitcoIIILimitedMember2020-01-012020-03-310001363829esgr:EnhanzedReMembersrt:AffiliatedEntityMember2018-12-310001363829esgr:EnhanzedReMemberesgr:EnstarMember2018-12-310001363829esgr:EnhanzedReMemberesgr:AllianzMember2018-12-310001363829esgr:EnhanzedReMemberesgr:HillhouseMember2018-12-310001363829esgr:EnhanzedReMemberesgr:EnstarMember2021-03-310001363829esgr:EnhanzedReMember2021-01-012021-03-310001363829esgr:EnhanzedReMember2020-01-012020-03-310001363829esgr:EnhanzedReMemberesgr:ZurichMember2020-10-012020-10-010001363829esgr:EnhanzedReMembersrt:AffiliatedEntityMember2021-03-310001363829esgr:EnhanzedReMembersrt:AffiliatedEntityMember2021-03-310001363829esgr:EnhanzedReMembersrt:AffiliatedEntityMember2020-12-310001363829esgr:EnhanzedReMembersrt:AffiliatedEntityMember2021-01-012021-03-310001363829esgr:EnhanzedReMembersrt:AffiliatedEntityMember2020-01-012020-03-310001363829esgr:CoreSpecialtyMembersrt:AffiliatedEntityMember2021-03-310001363829esgr:CoreSpecialtyMemberesgr:AssumingQuotaShareReinsurancesMembersrt:AffiliatedEntityMember2021-03-310001363829esgr:CoreSpecialtyMemberesgr:AssumingQuotaShareReinsurancesMembersrt:AffiliatedEntityMember2020-12-310001363829esgr:CoreSpecialtyMemberesgr:CedingReinsurancesMembersrt:AffiliatedEntityMember2021-03-310001363829esgr:CoreSpecialtyMemberesgr:CedingReinsurancesMembersrt:AffiliatedEntityMember2020-12-310001363829us-gaap:ServiceAgreementsMemberesgr:CoreSpecialtyMembersrt:AffiliatedEntityMember2021-03-310001363829us-gaap:ServiceAgreementsMemberesgr:CoreSpecialtyMembersrt:AffiliatedEntityMember2020-12-310001363829esgr:CoreSpecialtyMemberesgr:SaleAndRecapitalizationAgreementMembersrt:AffiliatedEntityMember2021-03-310001363829esgr:CoreSpecialtyMemberesgr:SaleAndRecapitalizationAgreementMembersrt:AffiliatedEntityMember2020-12-310001363829esgr:CoreSpecialtyMemberesgr:AssumingQuotaShareReinsurancesMembersrt:AffiliatedEntityMember2021-01-012021-03-310001363829us-gaap:ServiceAgreementsMemberesgr:CoreSpecialtyMembersrt:AffiliatedEntityMember2021-01-012021-03-310001363829esgr:CoreSpecialtyMemberesgr:SaleAndRecapitalizationAgreementMembersrt:AffiliatedEntityMember2021-01-012021-03-310001363829esgr:CoreSpecialtyMembersrt:AffiliatedEntityMember2021-01-012021-03-310001363829country:US2021-01-012021-03-310001363829country:US2020-01-012020-12-310001363829esgr:LimitedParentalGuaranteeMember2021-03-310001363829esgr:LimitedParentalGuaranteeMember2020-12-310001363829srt:MinimumMember2021-03-310001363829srt:MaximumMember2021-03-310001363829us-gaap:DisposalGroupHeldForSaleOrDisposedOfBySaleNotDiscontinuedOperationsMemberesgr:AtriumSegmentMember2020-12-310001363829esgr:AtriumSegmentMember2020-01-012020-12-310001363829us-gaap:OperatingSegmentsMemberesgr:InvestmentSegmentMember2021-01-012021-03-310001363829us-gaap:OperatingSegmentsMemberesgr:InvestmentSegmentMember2020-01-012020-03-31

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 10-Q
QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the quarterly period ended March 31, 2021
Commission File Number 001-33289
https://cdn.kscope.io/4b5e864d12733f6f9270cb3bab6c2d0d-esgr-20210331_g1.jpg
ENSTAR GROUP LIMITED
(Exact name of Registrant as specified in its charter)
BERMUDAN/A
(State or other jurisdiction of incorporation or organization)(I.R.S. Employer Identification No.)
Windsor Place, 3rd Floor, 22 Queen Street, Hamilton HM JX, Bermuda
(Address of principal executive offices, including zip code)
Registrant’s telephone number, including area code: (441292-3645
Securities registered pursuant to Section 12(b) of the Act:
Title of Each ClassTrading Symbol(s)Name of Each Exchange on Which Registered
Ordinary shares, par value $1.00 per shareESGRThe NASDAQ Stock MarketLLC
Depositary Shares, Each Representing a 1/1,000th Interest in a 7.00% ESGRPThe NASDAQ Stock MarketLLC
Fixed-to-Floating Rate Perpetual Non-Cumulative Preferred Share, Series D, Par Value $1.00 Per Share
Depositary Shares, Each Representing a 1/1,000th Interest in a 7.00%ESGROThe NASDAQ Stock MarketLLC
Perpetual Non-Cumulative Preferred Share, Series E, Par Value $1.00 Per Share
Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  ☒   No ☐
Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).    Yes ☒ No ☐
Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and "emerging growth company" in Rule 12b-2 of the Exchange Act.
Large accelerated filer
Accelerated filer¨Non-accelerated filer¨Smaller reporting companyEmerging growth company
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐
Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ☐    No  
As at May 5, 2021, the registrant had outstanding 18,597,598 voting ordinary shares and 3,599,272 non-voting convertible ordinary shares, each par value $1.00 per share.


Table of Contents


Enstar Group Limited
Quarterly Report on Form 10-Q
For the Period Ended March 31, 2021

Table of Contents
 
  Page
PART I
Item 1.
Item 2.
Item 3.
Item 4.
PART II
Item 1.
Item 1A.
Item 2.
Item 6.


Table of Contents

PART I — FINANCIAL INFORMATION
ITEM 1.   FINANCIAL STATEMENTS
CONSOLIDATED FINANCIAL STATEMENTSPage

1

Table of Contents

ENSTAR GROUP LIMITED
CONDENSED CONSOLIDATED BALANCE SHEETS
As of March 31, 2021 (unaudited) and December 31, 2020
March 31, 2021December 31, 2020
(expressed in thousands of U.S. dollars, except share data)
ASSETS
Short-term investments, trading, at fair value$11,944 $5,129 
Short-term investments, available-for-sale, at fair value (amortized cost: 2021 — $89,585; 2020 — $263,750; net of allowance: 2021 — $0; 2020 — $0)
89,637 263,795 
Fixed maturities, trading, at fair value4,310,958 4,594,892 
Fixed maturities, available-for-sale, at fair value (amortized cost: 2021 — $4,604,273; 2020 — $3,312,891; net of allowance: 2021 — $12,538; 2020 — $322)
4,567,490 3,395,100 
Funds held - directly managed1,016,531 1,074,890 
Equities, at fair value 1,098,568 846,795 
Other investments, at fair value 4,519,046 4,244,034 
Equity method investments938,618 832,295 
Total investments (Note 4 and Note 10)
16,552,792 15,256,930 
Cash and cash equivalents562,328 901,152 
Restricted cash and cash equivalents433,365 471,964 
Premiums receivable420,944 405,793 
Reinsurance balances recoverable on paid and unpaid losses (net of allowance: 2021 — $138,765; 2020 — $137,122) (Note 6)
1,559,481 1,568,333 
Reinsurance balances recoverable on paid and unpaid losses, at fair value (Note 6 and Note 10)
490,814 520,830 
Insurance balances recoverable (net of allowance: 2021 — $5,272; 2020 — $4,824) (Note 9)
248,010 249,652 
Funds held by reinsured companies662,645 635,819 
Other assets 1,129,413 925,533 
Assets held-for-sale (Note 3)
 711,278 
TOTAL ASSETS$22,059,792 $21,647,284 
LIABILITIES
Losses and loss adjustment expenses (Note 8)
$9,150,038 $8,140,362 
Losses and loss adjustment expenses, at fair value (Note 8 and Note 10)
2,277,382 2,452,920 
Defendant asbestos and environmental liabilities (Note 9)
691,557 706,329 
Insurance and reinsurance balances payable610,323 494,412 
Debt obligations (Note 13)
1,363,515 1,373,259 
Other liabilities1,018,743 942,905 
Liabilities held-for-sale (Note 3)
 483,657 
TOTAL LIABILITIES15,111,558 14,593,844 
COMMITMENTS AND CONTINGENCIES (Note 20)
REDEEMABLE NONCONTROLLING INTEREST (Note 14)
174,803 365,436 
SHAREHOLDERS’ EQUITY (Note 15)
Ordinary shares (par value $1 each, issued and outstanding 2021: 22,195,159; 2020: 22,085,232):
Voting Ordinary shares (issued and outstanding 2021: 18,595,887; 2020: 18,575,550)
18,596 18,576 
Non-voting convertible ordinary Series C Shares (issued and outstanding 2021: 2,689,262; 2020: 2,599,672)
2,690 2,600 
Non-voting convertible ordinary Series E Shares (issued and outstanding 2021 and 2020: 910,010)
910 910 
Preferred Shares:
Series C Preferred Shares (issued and held in treasury 2021 and 2020: 388,571)
389 389 
Series D Preferred Shares (issued and outstanding 2021 and 2020: 16,000)
400,000 400,000 
Series E Preferred Shares (issued and outstanding 2021 and 2020: 4,400)
110,000 110,000 
Treasury shares, at cost (Series C Preferred shares 2021 and 2010: 388,571)
(421,559)(421,559)
Joint Share Ownership Plan (voting ordinary shares, held in trust 2021 and 2020: 565,630)
(566)(566)
Additional paid-in capital1,836,792 1,836,074 
Accumulated other comprehensive income (loss)(17,715)80,659 
Retained earnings4,831,239 4,647,312 
Total Enstar Shareholders’ Equity6,760,776 6,674,395 
Noncontrolling interest (Note 14)
12,655 13,609 
TOTAL SHAREHOLDERS’ EQUITY6,773,431 6,688,004 
TOTAL LIABILITIES, REDEEMABLE NONCONTROLLING INTEREST AND SHAREHOLDERS’ EQUITY$22,059,792 $21,647,284 
See accompanying notes to the unaudited condensed consolidated financial statements
2

Table of Contents

ENSTAR GROUP LIMITED
CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS (UNAUDITED)
For the Three Months Ended March 31, 2021 and 2020
Three Months Ended
March 31,
20212020
(expressed in thousands of U.S. dollars, except share and per share data)
INCOME
Net premiums earned$92,876 $159,351 
Fees and commission income9,598 7,528 
Net investment income62,089 74,714 
Net realized and unrealized losses(20,788)(629,061)
Other income551 20,444 
Net gain on sale of subsidiaries14,894  
159,220 (367,024)
EXPENSES
Net incurred losses and loss adjustment expenses(55,507)43,300 
Acquisition costs34,014 46,043 
General and administrative expenses83,000 98,428 
Interest expense16,179 13,415 
Net foreign exchange (gains) losses2,634 (11,939)
80,320 189,247 
EARNINGS (LOSS) BEFORE INCOME TAXES78,900 (556,271)
Income tax benefit5,982 5,272 
Earnings from equity method investments118,031 12,450 
NET EARNINGS (LOSS) FROM CONTINUING OPERATIONS202,913 (538,549)
Net loss from discontinued operations, net of income taxes (2,069)
NET EARNINGS (LOSS)202,913 (540,618)
Net (earnings) loss attributable to noncontrolling interest(10,791)32,722 
NET EARNINGS (LOSS) ATTRIBUTABLE TO ENSTAR192,122 (507,896)
Dividends on preferred shares(8,925)(8,925)
NET EARNINGS (LOSS) ATTRIBUTABLE TO ENSTAR ORDINARY SHAREHOLDERS$183,197 $(516,821)
Earnings (loss) per ordinary share attributable to Enstar:
Basic:
Net earnings (loss) from continuing operations$8.50 $(23.93)
Net loss from discontinued operations (0.05)
Net earnings (loss) per ordinary share$8.50 $(23.98)
Diluted:
Net earnings (loss) from continuing operations$8.38 $(23.93)
Net loss from discontinued operations (0.05)
Net earnings (loss) per ordinary share$8.38 $(23.98)
Weighted average ordinary shares outstanding:
Basic21,562,341 21,549,844 
Diluted21,852,324 21,779,906 

See accompanying notes to the unaudited condensed consolidated financial statements
3

Table of Contents

ENSTAR GROUP LIMITED
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED)
For the Three Months Ended March 31, 2021 and 2020
 
Three Months Ended
March 31,
20212020
 (expressed in thousands of U.S. dollars)
NET EARNINGS (LOSS)$202,913 $(540,618)
Other comprehensive income (loss), net of income taxes:
Unrealized losses on fixed income available-for-sale investments arising during the period(111,274)(58,735)
Reclassification adjustment for change in allowance for credit losses recognized in net earnings12,025 13,212 
Reclassification adjustment for net realized (gains) losses included in net earnings(594)212 
Reclassification to earnings on disposal of subsidiary475  
Unrealized losses arising during the period, net of reclassification adjustments(99,368)(45,311)
Cumulative currency translation adjustment1,418 (686)
Total other comprehensive loss(97,950)(45,997)
Comprehensive income (loss)104,963 (586,615)
Comprehensive (income) loss attributable to noncontrolling interest(11,216)36,892 
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO ENSTAR$93,747 $(549,723)

See accompanying notes to the unaudited condensed consolidated financial statements

4

Table of Contents

ENSTAR GROUP LIMITED
CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS’ EQUITY (UNAUDITED)
For the Three Months Ended March 31, 2021 and 2020
Three Months Ended
March 31,
20212020
 (expressed in thousands of U.S. dollars)
Share Capital — Voting Ordinary Shares
Balance, beginning of period$18,576 $18,002 
Issue of shares38 701 
Shares repurchased(18)(93)
Balance, end of period$18,596 $18,610 
Share Capital — Non-Voting Convertible Ordinary Series C Shares
Balance, beginning of period$2,600 $