P1Y14000000false--12-31FY20190001214816017658000017658000017658000017658000083586000840110008395900083959000P95DP45DP60DP90DP60DP60DP5Y150000000313000000P3YP3YP3Y2206000929940009256900092621000926210000 0001214816 2019-01-01 2019-12-31 0001214816 2020-02-21 0001214816 2019-06-28 0001214816 us-gaap:CommonStockMember 2019-01-01 2019-12-31 0001214816 us-gaap:SeriesEPreferredStockMember 2019-01-01 2019-12-31 0001214816 2018-12-31 0001214816 2019-12-31 0001214816 2017-01-01 2017-12-31 0001214816 2018-01-01 2018-12-31 0001214816 us-gaap:TreasuryStockCommonMember 2019-12-31 0001214816 us-gaap:TreasuryStockCommonMember 2018-01-01 2018-12-31 0001214816 us-gaap:AdditionalPaidInCapitalMember 2017-12-31 0001214816 us-gaap:AccountingStandardsUpdate201601Member us-gaap:RetainedEarningsMember 2017-12-31 0001214816 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2016-12-31 0001214816 us-gaap:AccountingStandardsUpdate201601Member us-gaap:RetainedEarningsMember 2018-12-31 0001214816 us-gaap:PreferredStockMember 2018-12-31 0001214816 us-gaap:AdditionalPaidInCapitalMember 2017-01-01 2017-12-31 0001214816 us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember 2019-01-01 2019-12-31 0001214816 us-gaap:AccountingStandardsUpdate201802Member us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember 2017-12-31 0001214816 us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember 2018-01-01 2018-12-31 0001214816 us-gaap:CommonStockMember 2018-12-31 0001214816 us-gaap:TreasuryStockCommonMember 2016-12-31 0001214816 us-gaap:AccumulatedTranslationAdjustmentMember 2019-01-01 2019-12-31 0001214816 us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember 2017-01-01 2017-12-31 0001214816 us-gaap:AccountingStandardsUpdate201802Member us-gaap:RetainedEarningsMember 2018-12-31 0001214816 us-gaap:AccumulatedTranslationAdjustmentMember 2018-01-01 2018-12-31 0001214816 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2017-12-31 0001214816 us-gaap:PreferredStockMember 2019-12-31 0001214816 us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember 2018-12-31 0001214816 us-gaap:TreasuryStockCommonMember 2019-01-01 2019-12-31 0001214816 us-gaap:RetainedEarningsMember 2018-01-01 2018-12-31 0001214816 us-gaap:AccumulatedTranslationAdjustmentMember 2018-12-31 0001214816 us-gaap:TreasuryStockCommonMember 2017-01-01 2017-12-31 0001214816 us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember 2017-12-31 0001214816 us-gaap:AccountingStandardsUpdate201802Member us-gaap:RetainedEarningsMember 2016-12-31 0001214816 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2019-12-31 0001214816 us-gaap:RetainedEarningsMember 2016-12-31 0001214816 us-gaap:AccountingStandardsUpdate201601Member us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember 2016-12-31 0001214816 us-gaap:TreasuryStockCommonMember 2017-12-31 0001214816 us-gaap:RetainedEarningsMember 2018-12-31 0001214816 us-gaap:RetainedEarningsMember 2019-01-01 2019-12-31 0001214816 us-gaap:TreasuryStockCommonMember 2018-12-31 0001214816 us-gaap:AccumulatedTranslationAdjustmentMember 2019-12-31 0001214816 us-gaap:AdditionalPaidInCapitalMember 2019-01-01 2019-12-31 0001214816 us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember 2019-12-31 0001214816 us-gaap:PreferredStockMember 2017-01-01 2017-12-31 0001214816 us-gaap:AdditionalPaidInCapitalMember 2018-12-31 0001214816 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2018-12-31 0001214816 us-gaap:AdditionalPaidInCapitalMember 2018-01-01 2018-12-31 0001214816 us-gaap:AccountingStandardsUpdate201601Member us-gaap:RetainedEarningsMember 2016-12-31 0001214816 us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember 2016-12-31 0001214816 us-gaap:RetainedEarningsMember 2017-01-01 2017-12-31 0001214816 us-gaap:AccountingStandardsUpdate201601Member us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember 2018-12-31 0001214816 us-gaap:AccumulatedTranslationAdjustmentMember 2017-01-01 2017-12-31 0001214816 us-gaap:CommonStockMember 2017-12-31 0001214816 us-gaap:AccountingStandardsUpdate201601Member us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember 2017-12-31 0001214816 us-gaap:AccumulatedTranslationAdjustmentMember 2017-12-31 0001214816 us-gaap:RetainedEarningsMember 2017-12-31 0001214816 us-gaap:PreferredStockMember 2018-01-01 2018-12-31 0001214816 2017-12-31 0001214816 us-gaap:PreferredStockMember 2017-12-31 0001214816 us-gaap:AccountingStandardsUpdate201802Member us-gaap:RetainedEarningsMember 2017-12-31 0001214816 us-gaap:PreferredStockMember 2019-01-01 2019-12-31 0001214816 us-gaap:CommonStockMember 2019-12-31 0001214816 us-gaap:RetainedEarningsMember 2019-12-31 0001214816 us-gaap:AccountingStandardsUpdate201802Member us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember 2018-12-31 0001214816 us-gaap:PreferredStockMember 2016-12-31 0001214816 us-gaap:AdditionalPaidInCapitalMember 2016-12-31 0001214816 us-gaap:AdditionalPaidInCapitalMember 2019-12-31 0001214816 us-gaap:AccumulatedTranslationAdjustmentMember 2016-12-31 0001214816 us-gaap:AccountingStandardsUpdate201802Member us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember 2016-12-31 0001214816 us-gaap:CommonStockMember 2016-12-31 0001214816 2016-12-31 0001214816 axs:NovaeSyndicate2007Member 2018-01-01 2018-12-31 0001214816 axs:AxisCorporateCapitalUKLimitedMember 2019-01-01 2019-01-01 0001214816 axs:AxisCorporateCapitalUKLimitedIIMember 2019-01-01 2019-01-01 0001214816 axs:NovaeMember 2017-10-02 0001214816 us-gaap:OperatingSegmentsMember srt:RestatementAdjustmentMember axs:InsuranceMember 2017-01-01 2017-12-31 0001214816 us-gaap:AccountingStandardsUpdate201602Member 2019-01-01 0001214816 us-gaap:AccountingStandardsUpdate201602Member 2019-03-31 0001214816 us-gaap:OperatingSegmentsMember srt:RestatementAdjustmentMember axs:ReinsuranceMember 2017-01-01 2017-12-31 0001214816 us-gaap:OperatingSegmentsMember 2018-01-01 2018-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:InsuranceMember 2018-01-01 2018-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:ReinsuranceMember 2018-12-31 0001214816 us-gaap:MaterialReconcilingItemsMember 2018-01-01 2018-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:ReinsuranceMember 2018-01-01 2018-12-31 0001214816 us-gaap:OperatingSegmentsMember 2018-12-31 0001214816 us-gaap:CorporateNonSegmentMember 2018-01-01 2018-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:InsuranceMember 2018-12-31 0001214816 us-gaap:OperatingSegmentsMember 2017-01-01 2017-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:ReinsuranceMember 2019-01-01 2019-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:CatastropheReinsuranceMember axs:ReinsuranceMember 2019-01-01 2019-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:ProfessionalLinesMember axs:ReinsuranceMember 2017-01-01 2017-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:ReinsuranceMember 2017-01-01 2017-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:AgricultureLineMember axs:ReinsuranceMember 2019-01-01 2019-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:EngineeringMember axs:ReinsuranceMember 2018-01-01 2018-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:TerrorismMember axs:InsuranceMember 2017-01-01 2017-12-31 0001214816 us-gaap:OperatingSegmentsMember us-gaap:PropertyInsuranceProductLineMember axs:InsuranceMember 2018-01-01 2018-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:CreditAndPoliticalRiskMember axs:InsuranceMember 2017-01-01 2017-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:LiabilityLineMember axs:InsuranceMember 2018-01-01 2018-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:AgricultureLineMember axs:ReinsuranceMember 2018-01-01 2018-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:MarineMember axs:InsuranceMember 2019-01-01 2019-12-31 0001214816 us-gaap:OperatingSegmentsMember us-gaap:AccidentAndHealthInsuranceSegmentMember axs:InsuranceMember 2018-01-01 2018-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:CatastropheReinsuranceMember axs:ReinsuranceMember 2017-01-01 2017-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:AviationMember axs:InsuranceMember 2018-01-01 2018-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:AgricultureLineMember axs:ReinsuranceMember 2017-01-01 2017-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:AviationMember axs:InsuranceMember 2019-01-01 2019-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:AviationMember axs:InsuranceMember 2017-01-01 2017-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:DiscontinuedLinesMember axs:ReinsuranceMember 2017-01-01 2017-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:MotorMember axs:ReinsuranceMember 2017-01-01 2017-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:MarineAndOtherLinesOfBusinessMember axs:ReinsuranceMember 2019-01-01 2019-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:EngineeringMember axs:ReinsuranceMember 2017-01-01 2017-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:CreditAndPoliticalRiskMember axs:InsuranceMember 2019-01-01 2019-12-31 0001214816 us-gaap:OperatingSegmentsMember us-gaap:PropertyInsuranceProductLineMember axs:InsuranceMember 2017-01-01 2017-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:TerrorismMember axs:InsuranceMember 2018-01-01 2018-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:LiabilityLineMember axs:InsuranceMember 2019-01-01 2019-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:DiscontinuedLinesMember axs:InsuranceMember 2018-01-01 2018-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:ProfessionalLinesMember axs:InsuranceMember 2019-01-01 2019-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:DiscontinuedLinesMember axs:ReinsuranceMember 2019-01-01 2019-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:CreditAndBondMember axs:ReinsuranceMember 2019-01-01 2019-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:CreditAndBondMember axs:ReinsuranceMember 2018-01-01 2018-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:EngineeringMember axs:ReinsuranceMember 2019-01-01 2019-12-31 0001214816 us-gaap:OperatingSegmentsMember us-gaap:PropertyInsuranceProductLineMember axs:ReinsuranceMember 2019-01-01 2019-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:CatastropheReinsuranceMember axs:ReinsuranceMember 2018-01-01 2018-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:MotorMember axs:ReinsuranceMember 2018-01-01 2018-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:MarineMember axs:InsuranceMember 2018-01-01 2018-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:DiscontinuedLinesMember axs:ReinsuranceMember 2018-01-01 2018-12-31 0001214816 us-gaap:OperatingSegmentsMember us-gaap:AccidentAndHealthInsuranceSegmentMember axs:ReinsuranceMember 2017-01-01 2017-12-31 0001214816 us-gaap:OperatingSegmentsMember us-gaap:PropertyInsuranceProductLineMember axs:ReinsuranceMember 2017-01-01 2017-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:ProfessionalLinesMember axs:InsuranceMember 2018-01-01 2018-12-31 0001214816 us-gaap:OperatingSegmentsMember us-gaap:AccidentAndHealthInsuranceSegmentMember axs:InsuranceMember 2019-01-01 2019-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:LiabilityLineMember axs:ReinsuranceMember 2018-01-01 2018-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:MarineMember axs:InsuranceMember 2017-01-01 2017-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:MarineAndOtherLinesOfBusinessMember axs:ReinsuranceMember 2017-01-01 2017-12-31 0001214816 us-gaap:OperatingSegmentsMember us-gaap:AccidentAndHealthInsuranceSegmentMember axs:ReinsuranceMember 2019-01-01 2019-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:MarineAndOtherLinesOfBusinessMember axs:ReinsuranceMember 2018-01-01 2018-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:LiabilityLineMember axs:ReinsuranceMember 2017-01-01 2017-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:CreditAndPoliticalRiskMember axs:InsuranceMember 2018-01-01 2018-12-31 0001214816 us-gaap:OperatingSegmentsMember 2019-01-01 2019-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:InsuranceMember 2017-01-01 2017-12-31 0001214816 us-gaap:OperatingSegmentsMember us-gaap:AccidentAndHealthInsuranceSegmentMember axs:ReinsuranceMember 2018-01-01 2018-12-31 0001214816 us-gaap:OperatingSegmentsMember us-gaap:PropertyInsuranceProductLineMember axs:ReinsuranceMember 2018-01-01 2018-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:LiabilityLineMember axs:InsuranceMember 2017-01-01 2017-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:ProfessionalLinesMember axs:ReinsuranceMember 2018-01-01 2018-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:ProfessionalLinesMember axs:ReinsuranceMember 2019-01-01 2019-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:DiscontinuedLinesMember axs:InsuranceMember 2017-01-01 2017-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:InsuranceMember 2019-01-01 2019-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:ProfessionalLinesMember axs:InsuranceMember 2017-01-01 2017-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:MotorMember axs:ReinsuranceMember 2019-01-01 2019-12-31 0001214816 us-gaap:OperatingSegmentsMember us-gaap:AccidentAndHealthInsuranceSegmentMember axs:InsuranceMember 2017-01-01 2017-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:DiscontinuedLinesMember axs:InsuranceMember 2019-01-01 2019-12-31 0001214816 us-gaap:OperatingSegmentsMember us-gaap:PropertyInsuranceProductLineMember axs:InsuranceMember 2019-01-01 2019-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:TerrorismMember axs:InsuranceMember 2019-01-01 2019-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:LiabilityLineMember axs:ReinsuranceMember 2019-01-01 2019-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:CreditAndBondMember axs:ReinsuranceMember 2017-01-01 2017-12-31 0001214816 country:IE 2019-01-01 2019-12-31 0001214816 country:BM 2019-01-01 2019-12-31 0001214816 country:IE 2017-01-01 2017-12-31 0001214816 country:BM 2017-01-01 2017-12-31 0001214816 country:BM 2018-01-01 2018-12-31 0001214816 axs:CountriesOtherThanBermudaIrelandAndUSMember 2019-01-01 2019-12-31 0001214816 country:IE 2018-01-01 2018-12-31 0001214816 country:US 2018-01-01 2018-12-31 0001214816 country:US 2017-01-01 2017-12-31 0001214816 country:US 2019-01-01 2019-12-31 0001214816 axs:CountriesOtherThanBermudaIrelandAndUSMember 2017-01-01 2017-12-31 0001214816 axs:CountriesOtherThanBermudaIrelandAndUSMember 2018-01-01 2018-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:InsuranceMember 2017-12-31 0001214816 us-gaap:MaterialReconcilingItemsMember 2017-01-01 2017-12-31 0001214816 us-gaap:CorporateNonSegmentMember 2017-01-01 2017-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:ReinsuranceMember 2017-12-31 0001214816 us-gaap:OperatingSegmentsMember 2017-12-31 0001214816 us-gaap:MaterialReconcilingItemsMember 2019-01-01 2019-12-31 0001214816 us-gaap:CorporateNonSegmentMember 2019-01-01 2019-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:ReinsuranceMember 2019-12-31 0001214816 us-gaap:OperatingSegmentsMember 2019-12-31 0001214816 us-gaap:OperatingSegmentsMember axs:InsuranceMember 2019-12-31 0001214816 axs:DistributionNetworksLargeBrokersMember 2018-12-31 0001214816 axs:CustomerListsTrademarkandNonCompeteMember 2018-12-31 0001214816 axs:NovaeMember us-gaap:IntangibleAssetsArisingFromInsuranceContractsAcquiredInBusinessCombinationMember 2018-12-31 0001214816 us-gaap:CustomerRelationshipsMember 2018-12-31 0001214816 axs:UnitesStatesStatelicensesMember 2018-12-31 0001214816 us-gaap:ContractBasedIntangibleAssetsMember 2018-12-31 0001214816 axs:DistributionNetworksCoverholdersMember 2018-12-31 0001214816 axs:AvaibelMember us-gaap:IntangibleAssetsArisingFromInsuranceContractsAcquiredInBusinessCombinationMember 2018-12-31 0001214816 axs:SyndicateCapacityMember 2018-12-31 0001214816 axs:DistributionNetworksSmallAndMidsizedEnterpriseBrokersMember 2018-12-31 0001214816 axs:NovaeMember us-gaap:IntangibleAssetsArisingFromInsuranceContractsAcquiredInBusinessCombinationMember 2019-12-31 0001214816 axs:DistributionNetworksSmallAndMidsizedEnterpriseBrokersMember 2019-12-31 0001214816 axs:DistributionNetworksLargeBrokersMember 2019-12-31 0001214816 us-gaap:CustomerRelationshipsMember 2019-12-31 0001214816 axs:UnitesStatesStatelicensesMember 2019-12-31 0001214816 axs:CustomerListsTrademarkandNonCompeteMember 2019-12-31 0001214816 axs:DistributionNetworksCoverholdersMember 2019-12-31 0001214816 axs:SyndicateCapacityMember 2019-12-31 0001214816 srt:MinimumMember 2019-01-01 2019-12-31 0001214816 us-gaap:ContractBasedIntangibleAssetsMember 2018-01-01 2018-12-31 0001214816 srt:MaximumMember 2019-01-01 2019-12-31 0001214816 axs:NovaeMember us-gaap:DistributionRightsMember 2017-12-31 0001214816 axs:NovaeMember 2017-12-31 0001214816 axs:ContessaLimitedMember 2017-12-31 0001214816 us-gaap:USTreasuryAndGovernmentMember 2019-12-31 0001214816 us-gaap:CommercialMortgageBackedSecuritiesMember 2019-12-31 0001214816 us-gaap:CorporateDebtSecuritiesMember 2018-12-31 0001214816 us-gaap:ForeignGovernmentDebtSecuritiesMember 2019-12-31 0001214816 us-gaap:USStatesAndPoliticalSubdivisionsMember 2019-12-31 0001214816 us-gaap:USStatesAndPoliticalSubdivisionsMember 2018-12-31 0001214816 us-gaap:FixedMaturitiesMember 2019-12-31 0001214816 us-gaap:ForeignGovernmentDebtSecuritiesMember 2018-12-31 0001214816 us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember 2019-12-31 0001214816 us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember 2018-12-31 0001214816 us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember 2019-12-31 0001214816 us-gaap:FixedMaturitiesMember 2018-12-31 0001214816 us-gaap:CommercialMortgageBackedSecuritiesMember 2018-12-31 0001214816 us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember 2018-12-31 0001214816 us-gaap:USTreasuryAndGovernmentMember 2018-12-31 0001214816 us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember 2019-12-31 0001214816 us-gaap:CorporateDebtSecuritiesMember 2019-12-31 0001214816 us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember 2018-12-31 0001214816 axs:OtherRedemptionRestrictionMember us-gaap:PrivateEquityFundsMember 2019-01-01 2019-12-31 0001214816 axs:AXISSyndicate1686Member 2018-12-31 0001214816 axs:OtherEquityMethodInvestmentsMember country:US 2017-01-01 2017-12-31 0001214816 axs:OtherRedemptionRestrictionMember us-gaap:HedgeFundsMultistrategyMember 2018-12-31 0001214816 axs:LockupRedemptionRestrictionMember us-gaap:HedgeFundsMember 2019-12-31 0001214816 axs:OtherRedemptionRestrictionMember axs:BankRevolverOpportunityFundsMember 2019-01-01 2019-12-31 0001214816 axs:NovaeSyndicate2007Member 2019-12-31 0001214816 axs:OtherRedemptionRestrictionMember axs:BankRevolverOpportunityFundsMember 2015-12-31 0001214816 axs:HarringtonReinsuranceHoldingsLimitedMember 2016-12-31 0001214816 axs:OtherRedemptionRestrictionMember us-gaap:PrivateEquityFundsMember 2019-12-31 0001214816 us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember us-gaap:PrimeMember 2019-12-31 0001214816 axs:OtherRedemptionRestrictionMember us-gaap:PrivateEquityFundsMember 2018-12-31 0001214816 axs:OtherRedemptionRestrictionMember axs:DirectLendingFundsMember 2019-01-01 2019-12-31 0001214816 axs:EurozoneMember us-gaap:ForeignGovernmentDebtSecuritiesMember 2019-12-31 0001214816 axs:EurozoneMember us-gaap:ForeignGovernmentDebtSecuritiesMember 2018-12-31 0001214816 axs:OtherRedemptionRestrictionMember axs:DirectLendingFundsMember 2019-12-31 0001214816 axs:OtherRedemptionRestrictionMember us-gaap:RealEstateFundsMember 2018-12-31 0001214816 axs:LockupRedemptionRestrictionMember us-gaap:HedgeFundsMember 2018-12-31 0001214816 us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember axs:AltaMember 2018-12-31 0001214816 axs:OtherEquityMethodInvestmentsMember country:US 2017-12-31 0001214816 axs:AXISSyndicate1686Member 2019-12-31 0001214816 axs:OtherRedemptionRestrictionMember srt:MaximumMember axs:DirectLendingFundsMember 2019-01-01 2019-12-31 0001214816 us-gaap:ExternalCreditRatingNonInvestmentGradeMember us-gaap:FixedMaturitiesMember 2019-12-31 0001214816 us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember us-gaap:PrimeMember 2018-12-31 0001214816 srt:WeightedAverageMember us-gaap:CommercialMortgageBackedSecuritiesMember 2019-12-31 0001214816 axs:NovaeSyndicate2007Member 2018-12-31 0001214816 us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember axs:AltaMember 2019-12-31 0001214816 srt:WeightedAverageMember us-gaap:CommercialMortgageBackedSecuritiesMember 2018-12-31 0001214816 us-gaap:ExternalCreditRatingNonInvestmentGradeMember us-gaap:FixedMaturitiesMember 2018-12-31 0001214816 axs:OtherRedemptionRestrictionMember axs:DirectLendingFundsMember 2018-12-31 0001214816 axs:OtherRedemptionRestrictionMember us-gaap:HedgeFundsMultistrategyMember 2019-12-31 0001214816 axs:OtherRedemptionRestrictionMember us-gaap:HedgeFundsMultistrategyMember 2019-01-01 2019-12-31 0001214816 axs:OtherRedemptionRestrictionMember srt:MinimumMember us-gaap:RealEstateFundsMember 2019-01-01 2019-12-31 0001214816 axs:OtherRedemptionRestrictionMember us-gaap:RealEstateFundsMember 2019-12-31 0001214816 axs:HarringtonReinsuranceHoldingsLimitedMember 2016-01-01 2016-12-31 0001214816 us-gaap:FixedMaturitiesMember 2019-01-01 2019-12-31 0001214816 us-gaap:ShortTermInvestmentsMember 2019-01-01 2019-12-31 0001214816 axs:AlternativeInvestmentsMember 2019-01-01 2019-12-31 0001214816 axs:AlternativeInvestmentsMember 2017-01-01 2017-12-31 0001214816 us-gaap:CashAndCashEquivalentsMember 2019-01-01 2019-12-31 0001214816 us-gaap:FixedMaturitiesMember 2018-01-01 2018-12-31 0001214816 us-gaap:EquitySecuritiesMember 2017-01-01 2017-12-31 0001214816 us-gaap:CashAndCashEquivalentsMember 2017-01-01 2017-12-31 0001214816 us-gaap:EquitySecuritiesMember 2019-01-01 2019-12-31 0001214816 us-gaap:EquitySecuritiesMember 2018-01-01 2018-12-31 0001214816 us-gaap:ShortTermInvestmentsMember 2017-01-01 2017-12-31 0001214816 us-gaap:ShortTermInvestmentsMember 2018-01-01 2018-12-31 0001214816 us-gaap:MortgagesMember 2019-01-01 2019-12-31 0001214816 us-gaap:MortgagesMember 2017-01-01 2017-12-31 0001214816 us-gaap:FixedMaturitiesMember 2017-01-01 2017-12-31 0001214816 axs:AlternativeInvestmentsMember 2018-01-01 2018-12-31 0001214816 us-gaap:CashAndCashEquivalentsMember 2018-01-01 2018-12-31 0001214816 us-gaap:MortgagesMember 2018-01-01 2018-12-31 0001214816 axs:DirectLendingFundsMember 2018-12-31 0001214816 us-gaap:RealEstateFundsMember 2018-12-31 0001214816 us-gaap:PrivateEquityFundsMember 2019-12-31 0001214816 us-gaap:PrivateEquityFundsMember 2018-12-31 0001214816 axs:OverseasDepositsMember 2018-12-31 0001214816 us-gaap:HedgeFundsEquityLongShortMember 2018-12-31 0001214816 axs:OverseasDepositsMember 2019-12-31 0001214816 us-gaap:CollateralizedLoanObligationsMember 2018-12-31 0001214816 us-gaap:HedgeFundsMultistrategyMember 2018-12-31 0001214816 us-gaap:HedgeFundsEquityLongShortMember 2019-12-31 0001214816 axs:DirectLendingFundsMember 2019-12-31 0001214816 us-gaap:HedgeFundsMultistrategyMember 2019-12-31 0001214816 axs:OtherPrivatelyHeldInvestmentsMember 2018-12-31 0001214816 us-gaap:CollateralizedLoanObligationsMember 2019-12-31 0001214816 axs:OtherPrivatelyHeldInvestmentsMember 2019-12-31 0001214816 us-gaap:RealEstateFundsMember 2019-12-31 0001214816 us-gaap:ForeignGovernmentDebtSecuritiesMember 2018-01-01 2018-12-31 0001214816 us-gaap:CommercialMortgageBackedSecuritiesMember 2019-01-01 2019-12-31 0001214816 us-gaap:CorporateDebtSecuritiesMember 2019-01-01 2019-12-31 0001214816 us-gaap:CommercialMortgageBackedSecuritiesMember 2017-01-01 2017-12-31 0001214816 us-gaap:ForeignGovernmentDebtSecuritiesMember 2019-01-01 2019-12-31 0001214816 us-gaap:CorporateDebtSecuritiesMember 2017-01-01 2017-12-31 0001214816 us-gaap:CommercialMortgageBackedSecuritiesMember 2018-01-01 2018-12-31 0001214816 us-gaap:CorporateDebtSecuritiesMember 2018-01-01 2018-12-31 0001214816 us-gaap:ForeignGovernmentDebtSecuritiesMember 2017-01-01 2017-12-31 0001214816 us-gaap:CommonStockMember 2019-01-01 2019-12-31 0001214816 us-gaap:ExchangeTradedFundsMember 2019-12-31 0001214816 us-gaap:ExchangeTradedFundsMember 2018-12-31 0001214816 axs:NonUnitedStatesBondMutualFundMember 2019-12-31 0001214816 axs:NonUnitedStatesBondMutualFundMember 2019-01-01 2019-12-31 0001214816 us-gaap:CommonStockMember 2018-12-31 0001214816 axs:NonUnitedStatesBondMutualFundMember 2018-01-01 2018-12-31 0001214816 us-gaap:ExchangeTradedFundsMember 2018-01-01 2018-12-31 0001214816 us-gaap:CommonStockMember 2018-01-01 2018-12-31 0001214816 us-gaap:CommonStockMember 2019-12-31 0001214816 axs:NonUnitedStatesBondMutualFundMember 2018-12-31 0001214816 us-gaap:ExchangeTradedFundsMember 2019-01-01 2019-12-31 0001214816 us-gaap:HedgeFundsEquityLongShortMember 2019-01-01 2019-12-31 0001214816 srt:MaximumMember us-gaap:HedgeFundsMultistrategyMember 2019-01-01 2019-12-31 0001214816 us-gaap:HedgeFundsEquityLongShortMember 2018-01-01 2018-12-31 0001214816 srt:MinimumMember us-gaap:HedgeFundsMultistrategyMember 2018-01-01 2018-12-31 0001214816 srt:MinimumMember us-gaap:HedgeFundsMultistrategyMember 2019-01-01 2019-12-31 0001214816 srt:MaximumMember us-gaap:HedgeFundsMultistrategyMember 2018-01-01 2018-12-31 0001214816 axs:OtherRedemptionRestrictionMember srt:MinimumMember axs:DirectLendingFundsMember 2019-01-01 2019-12-31 0001214816 us-gaap:FairValueInputsLevel3Member us-gaap:USStatesAndPoliticalSubdivisionsMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel3Member 2019-12-31 0001214816 us-gaap:FairValueInputsLevel1Member 2019-12-31 0001214816 us-gaap:FairValueInputsLevel2Member 2019-12-31 0001214816 us-gaap:FairValueInputsLevel1Member us-gaap:CommonStockMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel3Member us-gaap:PrivateEquityFundsMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel3Member us-gaap:CorporateDebtSecuritiesMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel3Member us-gaap:CommercialMortgageBackedSecuritiesMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel2Member us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel3Member us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel1Member us-gaap:CommercialMortgageBackedSecuritiesMember 2019-12-31 0001214816 us-gaap:FairValueMeasuredAtNetAssetValuePerShareMember us-gaap:RealEstateFundsMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel3Member us-gaap:ExchangeTradedFundsMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel1Member axs:DirectLendingFundsMember 2019-12-31 0001214816 us-gaap:FairValueMeasuredAtNetAssetValuePerShareMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel1Member axs:NonUnitedStatesBondMutualFundMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel2Member us-gaap:CommercialMortgageBackedSecuritiesMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel2Member axs:OverseasDepositsMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel1Member us-gaap:USTreasuryAndGovernmentMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel2Member us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember 2019-12-31 0001214816 axs:OverseasDepositsMember 2019-12-31 0001214816 us-gaap:FairValueMeasuredAtNetAssetValuePerShareMember axs:OverseasDepositsMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel2Member axs:DirectLendingFundsMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel2Member us-gaap:ExchangeTradedFundsMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel2Member us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember 2019-12-31 0001214816 us-gaap:FairValueMeasuredAtNetAssetValuePerShareMember axs:DirectLendingFundsMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel2Member us-gaap:CommonStockMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel2Member us-gaap:USStatesAndPoliticalSubdivisionsMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel2Member us-gaap:CollateralizedLoanObligationsMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel1Member us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember 2019-12-31 0001214816 us-gaap:FairValueMeasuredAtNetAssetValuePerShareMember us-gaap:PrivateEquityFundsMember 2019-12-31 0001214816 axs:DirectLendingFundsMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel1Member us-gaap:PrivateEquityFundsMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel3Member us-gaap:CollateralizedLoanObligationsMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel3Member axs:OtherPrivatelyHeldInvestmentsMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel2Member us-gaap:ForeignGovernmentDebtSecuritiesMember 2019-12-31 0001214816 us-gaap:PrivateEquityFundsMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel2Member us-gaap:HedgeFundsMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel1Member axs:OverseasDepositsMember 2019-12-31 0001214816 us-gaap:HedgeFundsMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel3Member us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel2Member us-gaap:RealEstateFundsMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel2Member axs:OtherPrivatelyHeldInvestmentsMember 2019-12-31 0001214816 us-gaap:CollateralizedLoanObligationsMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel3Member us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel1Member us-gaap:RealEstateFundsMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel3Member axs:OverseasDepositsMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel1Member axs:OtherPrivatelyHeldInvestmentsMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel2Member us-gaap:CorporateDebtSecuritiesMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel1Member us-gaap:CollateralizedLoanObligationsMember 2019-12-31 0001214816 us-gaap:FairValueMeasuredAtNetAssetValuePerShareMember us-gaap:CollateralizedLoanObligationsMember 2019-12-31 0001214816 axs:OtherPrivatelyHeldInvestmentsMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel1Member us-gaap:USStatesAndPoliticalSubdivisionsMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel3Member us-gaap:USTreasuryAndGovernmentMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel1Member us-gaap:CorporateDebtSecuritiesMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel1Member us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel2Member us-gaap:PrivateEquityFundsMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel2Member us-gaap:USTreasuryAndGovernmentMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel3Member us-gaap:HedgeFundsMember 2019-12-31 0001214816 us-gaap:FairValueMeasuredAtNetAssetValuePerShareMember us-gaap:HedgeFundsMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel3Member us-gaap:RealEstateFundsMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel1Member us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember 2019-12-31 0001214816 us-gaap:RealEstateFundsMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel3Member us-gaap:CommonStockMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel2Member axs:NonUnitedStatesBondMutualFundMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel1Member us-gaap:ForeignGovernmentDebtSecuritiesMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel1Member us-gaap:HedgeFundsMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel3Member us-gaap:ForeignGovernmentDebtSecuritiesMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel3Member axs:DirectLendingFundsMember 2019-12-31 0001214816 us-gaap:FairValueMeasuredAtNetAssetValuePerShareMember axs:OtherPrivatelyHeldInvestmentsMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel1Member us-gaap:ExchangeTradedFundsMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel3Member axs:NonUnitedStatesBondMutualFundMember 2019-12-31 0001214816 axs:InsuranceLinkedSecuritiesMember 2018-01-01 2018-12-31 0001214816 us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember 2019-01-01 2019-12-31 0001214816 axs:OtherPrivatelyHeldInvestmentsMember 2018-01-01 2018-12-31 0001214816 us-gaap:OtherAssetsMember 2019-01-01 2019-12-31 0001214816 axs:InsuranceLinkedSecuritiesMember 2019-01-01 2019-12-31 0001214816 us-gaap:OtherAssetsMember 2018-01-01 2018-12-31 0001214816 axs:OtherPrivatelyHeldInvestmentsMember 2019-01-01 2019-12-31 0001214816 us-gaap:CollateralizedLoanObligationsMember 2019-01-01 2019-12-31 0001214816 us-gaap:DerivativeMember 2018-01-01 2018-12-31 0001214816 us-gaap:OtherAssetsMember 2019-12-31 0001214816 us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember 2018-01-01 2018-12-31 0001214816 us-gaap:FixedMaturitiesMember 2019-01-01 2019-12-31 0001214816 us-gaap:FixedMaturitiesMember 2018-01-01 2018-12-31 0001214816 us-gaap:CollateralizedLoanObligationsMember 2018-01-01 2018-12-31 0001214816 axs:AlternativeInvestmentsMember 2018-01-01 2018-12-31 0001214816 us-gaap:DerivativeMember 2019-12-31 0001214816 us-gaap:DerivativeMember 2017-12-31 0001214816 us-gaap:DerivativeMember 2018-12-31 0001214816 axs:InsuranceLinkedSecuritiesMember 2017-12-31 0001214816 us-gaap:DerivativeMember 2019-01-01 2019-12-31 0001214816 us-gaap:CollateralizedLoanObligationsMember 2018-12-31 0001214816 us-gaap:OtherAssetsMember 2018-12-31 0001214816 axs:AlternativeInvestmentsMember 2019-01-01 2019-12-31 0001214816 us-gaap:CorporateDebtSecuritiesMember 2017-12-31 0001214816 axs:InsuranceLinkedSecuritiesMember 2018-12-31 0001214816 axs:AlternativeInvestmentsMember 2017-12-31 0001214816 us-gaap:OtherAssetsMember 2017-12-31 0001214816 us-gaap:FixedMaturitiesMember 2017-12-31 0001214816 axs:OtherPrivatelyHeldInvestmentsMember 2017-12-31 0001214816 us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember 2017-12-31 0001214816 axs:AlternativeInvestmentsMember 2018-12-31 0001214816 us-gaap:CommercialMortgageBackedSecuritiesMember 2017-12-31 0001214816 us-gaap:CollateralizedLoanObligationsMember 2017-12-31 0001214816 axs:OtherPrivatelyHeldInvestmentsMember 2018-12-31 0001214816 axs:InsuranceLinkedSecuritiesMember 2019-12-31 0001214816 axs:AlternativeInvestmentsMember 2019-12-31 0001214816 srt:WeightedAverageMember us-gaap:CollateralizedLoanObligationsMember us-gaap:FairValueInputsLevel3Member 2019-01-01 2019-12-31 0001214816 us-gaap:CollateralizedLoanObligationsMember us-gaap:FairValueInputsLevel3Member axs:MeasurementInputCollateralSpreadsMember 2019-12-31 0001214816 us-gaap:CollateralizedLoanObligationsMember us-gaap:FairValueInputsLevel3Member 2019-12-31 0001214816 srt:WeightedAverageMember us-gaap:CollateralizedLoanObligationsMember us-gaap:FairValueInputsLevel3Member us-gaap:MeasurementInputLossSeverityMember 2019-12-31 0001214816 us-gaap:CollateralizedLoanObligationsMember us-gaap:FairValueInputsLevel3Member us-gaap:MeasurementInputLossSeverityMember 2019-12-31 0001214816 us-gaap:CollateralizedLoanObligationsMember us-gaap:FairValueInputsLevel3Member 2019-01-01 2019-12-31 0001214816 srt:WeightedAverageMember us-gaap:CollateralizedLoanObligationsMember us-gaap:FairValueInputsLevel3Member us-gaap:MeasurementInputDefaultRateMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel3Member us-gaap:MeasurementInputDiscountRateMember 2019-12-31 0001214816 srt:WeightedAverageMember us-gaap:FairValueInputsLevel3Member us-gaap:MeasurementInputDiscountRateMember 2019-12-31 0001214816 us-gaap:CollateralizedLoanObligationsMember us-gaap:FairValueInputsLevel3Member us-gaap:MeasurementInputDefaultRateMember 2019-12-31 0001214816 srt:WeightedAverageMember us-gaap:CollateralizedLoanObligationsMember us-gaap:FairValueInputsLevel3Member axs:MeasurementInputCollateralSpreadsMember 2019-12-31 0001214816 us-gaap:CarryingReportedAmountFairValueDisclosureMember 2018-12-31 0001214816 us-gaap:EstimateOfFairValueFairValueDisclosureMember 2019-12-31 0001214816 us-gaap:EstimateOfFairValueFairValueDisclosureMember 2018-12-31 0001214816 us-gaap:CarryingReportedAmountFairValueDisclosureMember 2019-12-31 0001214816 us-gaap:FairValueInputsLevel2Member us-gaap:CollateralizedLoanObligationsMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel2Member axs:NonUnitedStatesBondMutualFundMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel2Member us-gaap:ExchangeTradedFundsMember 2018-12-31 0001214816 us-gaap:FairValueMeasuredAtNetAssetValuePerShareMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel3Member us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel2Member us-gaap:CommonStockMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel3Member axs:DirectLendingFundsMember 2018-12-31 0001214816 axs:OverseasDepositsMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel1Member us-gaap:CollateralizedLoanObligationsMember 2018-12-31 0001214816 us-gaap:FairValueMeasuredAtNetAssetValuePerShareMember us-gaap:CollateralizedLoanObligationsMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel2Member 2018-12-31 0001214816 us-gaap:FairValueMeasuredAtNetAssetValuePerShareMember axs:DirectLendingFundsMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel1Member axs:DirectLendingFundsMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel3Member us-gaap:ExchangeTradedFundsMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel1Member 2018-12-31 0001214816 us-gaap:FairValueInputsLevel1Member axs:OtherPrivatelyHeldInvestmentsMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel3Member 2018-12-31 0001214816 us-gaap:FairValueInputsLevel3Member us-gaap:USStatesAndPoliticalSubdivisionsMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel3Member us-gaap:CorporateDebtSecuritiesMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel2Member us-gaap:USStatesAndPoliticalSubdivisionsMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel3Member us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel3Member us-gaap:USTreasuryAndGovernmentMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel2Member us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel1Member us-gaap:CorporateDebtSecuritiesMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel3Member us-gaap:RealEstateFundsMember 2018-12-31 0001214816 us-gaap:HedgeFundsMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel1Member us-gaap:ForeignGovernmentDebtSecuritiesMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel1Member us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel3Member us-gaap:CollateralizedLoanObligationsMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel2Member axs:OverseasDepositsMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel3Member us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel1Member us-gaap:CommonStockMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel2Member us-gaap:PrivateEquityFundsMember 2018-12-31 0001214816 us-gaap:FairValueMeasuredAtNetAssetValuePerShareMember us-gaap:PrivateEquityFundsMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel1Member axs:OverseasDepositsMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel2Member us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel2Member us-gaap:CommercialMortgageBackedSecuritiesMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel3Member us-gaap:CommercialMortgageBackedSecuritiesMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel2Member axs:DirectLendingFundsMember 2018-12-31 0001214816 axs:DirectLendingFundsMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel3Member us-gaap:PrivateEquityFundsMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel2Member us-gaap:USTreasuryAndGovernmentMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel3Member axs:OtherPrivatelyHeldInvestmentsMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel2Member axs:OtherPrivatelyHeldInvestmentsMember 2018-12-31 0001214816 us-gaap:RealEstateFundsMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel2Member us-gaap:CorporateDebtSecuritiesMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel1Member us-gaap:USStatesAndPoliticalSubdivisionsMember 2018-12-31 0001214816 us-gaap:PrivateEquityFundsMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel3Member us-gaap:HedgeFundsMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel3Member us-gaap:ForeignGovernmentDebtSecuritiesMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel2Member us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel1Member us-gaap:USTreasuryAndGovernmentMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel2Member us-gaap:HedgeFundsMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel1Member us-gaap:HedgeFundsMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel1Member us-gaap:CommercialMortgageBackedSecuritiesMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel1Member us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember 2018-12-31 0001214816 us-gaap:FairValueMeasuredAtNetAssetValuePerShareMember axs:OtherPrivatelyHeldInvestmentsMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel2Member us-gaap:ForeignGovernmentDebtSecuritiesMember 2018-12-31 0001214816 us-gaap:FairValueMeasuredAtNetAssetValuePerShareMember axs:OverseasDepositsMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel1Member us-gaap:PrivateEquityFundsMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel1Member axs:NonUnitedStatesBondMutualFundMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel1Member us-gaap:ExchangeTradedFundsMember 2018-12-31 0001214816 us-gaap:FairValueMeasuredAtNetAssetValuePerShareMember us-gaap:RealEstateFundsMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel3Member axs:OverseasDepositsMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel3Member axs:NonUnitedStatesBondMutualFundMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel1Member us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel3Member us-gaap:CommonStockMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel1Member us-gaap:RealEstateFundsMember 2018-12-31 0001214816 us-gaap:FairValueMeasuredAtNetAssetValuePerShareMember us-gaap:HedgeFundsMember 2018-12-31 0001214816 us-gaap:FairValueInputsLevel2Member us-gaap:RealEstateFundsMember 2018-12-31 0001214816 axs:UnderwritingPortfolioMember us-gaap:ForeignExchangeForwardMember us-gaap:NondesignatedMember us-gaap:ForeignCurrencyGainLossMember 2017-01-01 2017-12-31 0001214816 axs:UnderwritingPortfolioMember axs:OtherUnderwritingRelatedDerivativesMember us-gaap:NondesignatedMember us-gaap:OtherOperatingIncomeExpenseMember 2018-01-01 2018-12-31 0001214816 axs:UnderwritingPortfolioMember axs:OtherUnderwritingRelatedDerivativesMember us-gaap:NondesignatedMember us-gaap:OtherOperatingIncomeExpenseMember 2017-01-01 2017-12-31 0001214816 axs:InvestmentPortfolioMember us-gaap:InterestRateSwapMember us-gaap:NondesignatedMember us-gaap:GainLossOnInvestmentsMember1 2018-01-01 2018-12-31 0001214816 us-gaap:NondesignatedMember 2019-01-01 2019-12-31 0001214816 axs:InvestmentPortfolioMember us-gaap:InterestRateSwapMember us-gaap:NondesignatedMember us-gaap:GainLossOnInvestmentsMember1 2017-01-01 2017-12-31 0001214816 axs:UnderwritingPortfolioMember axs:WeatherRelatedDerivativeMember us-gaap:NondesignatedMember us-gaap:OtherOperatingIncomeExpenseMember 2017-01-01 2017-12-31 0001214816 axs:UnderwritingPortfolioMember us-gaap:ForeignExchangeForwardMember us-gaap:NondesignatedMember us-gaap:ForeignCurrencyGainLossMember 2019-01-01 2019-12-31 0001214816 axs:InvestmentPortfolioMember us-gaap:InterestRateSwapMember us-gaap:NondesignatedMember us-gaap:GainLossOnInvestmentsMember1 2019-01-01 2019-12-31 0001214816 us-gaap:NondesignatedMember 2018-01-01 2018-12-31 0001214816 axs:UnderwritingPortfolioMember us-gaap:ForeignExchangeForwardMember us-gaap:NondesignatedMember us-gaap:ForeignCurrencyGainLossMember 2018-01-01 2018-12-31 0001214816 us-gaap:NondesignatedMember 2017-01-01 2017-12-31 0001214816 axs:InvestmentPortfolioMember us-gaap:ForeignExchangeForwardMember us-gaap:NondesignatedMember us-gaap:GainLossOnInvestmentsMember1 2018-01-01 2018-12-31 0001214816 axs:UnderwritingPortfolioMember axs:OtherUnderwritingRelatedDerivativesMember us-gaap:NondesignatedMember us-gaap:OtherOperatingIncomeExpenseMember 2019-01-01 2019-12-31 0001214816 axs:UnderwritingPortfolioMember axs:WeatherRelatedDerivativeMember us-gaap:NondesignatedMember us-gaap:OtherOperatingIncomeExpenseMember 2019-01-01 2019-12-31 0001214816 axs:InvestmentPortfolioMember us-gaap:ForeignExchangeForwardMember us-gaap:NondesignatedMember us-gaap:GainLossOnInvestmentsMember1 2017-01-01 2017-12-31 0001214816 axs:InvestmentPortfolioMember us-gaap:ForeignExchangeForwardMember us-gaap:NondesignatedMember us-gaap:GainLossOnInvestmentsMember1 2019-01-01 2019-12-31 0001214816 axs:UnderwritingPortfolioMember axs:WeatherRelatedDerivativeMember us-gaap:NondesignatedMember us-gaap:OtherOperatingIncomeExpenseMember 2018-01-01 2018-12-31 0001214816 axs:UnderwritingPortfolioMember us-gaap:ForeignExchangeForwardMember us-gaap:NondesignatedMember 2018-12-31 0001214816 axs:InvestmentPortfolioMember us-gaap:OtherAssetsMember us-gaap:InterestRateSwapMember us-gaap:NondesignatedMember 2018-12-31 0001214816 axs:InvestmentPortfolioMember us-gaap:OtherAssetsMember us-gaap:ForeignExchangeForwardMember us-gaap:NondesignatedMember 2018-12-31 0001214816 axs:InvestmentPortfolioMember us-gaap:InterestRateSwapMember us-gaap:NondesignatedMember 2019-12-31 0001214816 axs:UnderwritingPortfolioMember us-gaap:OtherAssetsMember us-gaap:ForeignExchangeForwardMember us-gaap:NondesignatedMember 2019-12-31 0001214816 axs:UnderwritingPortfolioMember us-gaap:ForeignExchangeForwardMember us-gaap:NondesignatedMember 2019-12-31 0001214816 us-gaap:OtherLiabilitiesMember us-gaap:NondesignatedMember 2019-12-31 0001214816 axs:UnderwritingPortfolioMember us-gaap:OtherLiabilitiesMember us-gaap:ForeignExchangeForwardMember us-gaap:NondesignatedMember 2018-12-31 0001214816 axs:InvestmentPortfolioMember us-gaap:ForeignExchangeForwardMember us-gaap:NondesignatedMember 2018-12-31 0001214816 us-gaap:OtherAssetsMember us-gaap:NondesignatedMember 2019-12-31 0001214816 axs:UnderwritingPortfolioMember us-gaap:OtherAssetsMember axs:OtherUnderwritingRelatedDerivativesMember us-gaap:NondesignatedMember 2018-12-31 0001214816 axs:UnderwritingPortfolioMember us-gaap:OtherAssetsMember us-gaap:ForeignExchangeForwardMember us-gaap:NondesignatedMember 2018-12-31 0001214816 axs:InvestmentPortfolioMember us-gaap:OtherLiabilitiesMember us-gaap:ForeignExchangeForwardMember us-gaap:NondesignatedMember 2018-12-31 0001214816 axs:InvestmentPortfolioMember us-gaap:OtherLiabilitiesMember us-gaap:InterestRateSwapMember us-gaap:NondesignatedMember 2018-12-31 0001214816 axs:UnderwritingPortfolioMember axs:OtherUnderwritingRelatedDerivativesMember us-gaap:NondesignatedMember 2018-12-31 0001214816 axs:InvestmentPortfolioMember us-gaap:OtherAssetsMember us-gaap:ForeignExchangeForwardMember us-gaap:NondesignatedMember 2019-12-31 0001214816 axs:UnderwritingPortfolioMember us-gaap:OtherAssetsMember axs:OtherUnderwritingRelatedDerivativesMember us-gaap:NondesignatedMember 2019-12-31 0001214816 axs:InvestmentPortfolioMember us-gaap:OtherLiabilitiesMember us-gaap:ForeignExchangeForwardMember us-gaap:NondesignatedMember 2019-12-31 0001214816 us-gaap:OtherLiabilitiesMember us-gaap:NondesignatedMember 2018-12-31 0001214816 us-gaap:OtherAssetsMember us-gaap:NondesignatedMember 2018-12-31 0001214816 axs:InvestmentPortfolioMember us-gaap:ForeignExchangeForwardMember us-gaap:NondesignatedMember 2019-12-31 0001214816 axs:UnderwritingPortfolioMember us-gaap:OtherLiabilitiesMember axs:OtherUnderwritingRelatedDerivativesMember us-gaap:NondesignatedMember 2018-12-31 0001214816 axs:UnderwritingPortfolioMember us-gaap:OtherLiabilitiesMember us-gaap:ForeignExchangeForwardMember us-gaap:NondesignatedMember 2019-12-31 0001214816 axs:InvestmentPortfolioMember us-gaap:OtherAssetsMember us-gaap:InterestRateSwapMember us-gaap:NondesignatedMember 2019-12-31 0001214816 axs:InvestmentPortfolioMember us-gaap:InterestRateSwapMember us-gaap:NondesignatedMember 2018-12-31 0001214816 axs:InvestmentPortfolioMember us-gaap:OtherLiabilitiesMember us-gaap:InterestRateSwapMember us-gaap:NondesignatedMember 2019-12-31 0001214816 axs:UnderwritingPortfolioMember axs:OtherUnderwritingRelatedDerivativesMember us-gaap:NondesignatedMember 2019-12-31 0001214816 axs:UnderwritingPortfolioMember us-gaap:OtherLiabilitiesMember axs:OtherUnderwritingRelatedDerivativesMember us-gaap:NondesignatedMember 2019-12-31 0001214816 us-gaap:DiscontinuedOperationsDisposedOfByMeansOtherThanSaleMember 2017-02-13 0001214816 2019-12-15 0001214816 us-gaap:CatastropheMember 2018-01-01 2018-12-31 0001214816 axs:LiabilityInsuranceBusinessMember axs:ReinsuranceMember 2018-01-01 2018-12-31 0001214816 us-gaap:CatastropheMember 2019-01-01 2019-12-31 0001214816 2018-04-16 0001214816 axs:CompagnieBelgedAssurancesAviationNVSAMember 2017-04-01 0001214816 axs:MotorReserveClassMember axs:ReinsuranceMember 2019-08-05 0001214816 axs:ProfessionalLinesMember axs:InsuranceMember 2017-01-01 2017-12-31 0001214816 axs:ShortTailReservingClassInsuranceAndReinsuranceBusinessMember axs:ReinsuranceMember 2019-01-01 2019-12-31 0001214816 axs:CreditandSuretyBusinessMember axs:ReinsuranceMember 2019-01-01 2019-12-31 0001214816 axs:CreditAndPoliticalRiskMember axs:ReinsuranceMember 2019-01-01 2019-12-31 0001214816 axs:ShortTailReservingClassInsuranceAndReinsuranceBusinessMember 2017-01-01 2017-12-31 0001214816 axs:LiabilityInsuranceBusinessMember axs:InsuranceMember 2017-01-01 2017-12-31 0001214816 axs:MotorReserveClassMember axs:ReinsuranceMember 2017-03-20 0001214816 axs:MotorReserveClassMember axs:ReinsuranceMember 2017-03-19 0001214816 axs:LiabilityInsuranceBusinessMember axs:InsuranceMember 2019-01-01 2019-12-31 0001214816 axs:ShortTailReservingClassInsuranceAndReinsuranceBusinessMember 2019-01-01 2019-12-31 0001214816 axs:LiabilityInsuranceBusinessMember axs:ReinsuranceMember 2019-01-01 2019-12-31 0001214816 us-gaap:CatastropheMember 2017-01-01 2017-12-31 0001214816 axs:LiabilityInsuranceBusinessMember axs:InsuranceMember 2018-01-01 2018-12-31 0001214816 axs:ProfessionalLinesMember axs:ReinsuranceMember 2017-01-01 2017-12-31 0001214816 axs:CreditandSuretyBusinessMember axs:ReinsuranceMember 2017-01-01 2017-12-31 0001214816 axs:CompagnieBelgedAssurancesAviationNVSAMember 2017-12-31 0001214816 axs:MotorReserveClassMember axs:ReinsuranceMember 2018-01-01 2018-12-31 0001214816 axs:ShortTailReservingClassInsuranceAndReinsuranceBusinessMember axs:InsuranceMember 2019-01-01 2019-12-31 0001214816 axs:ShortTailReservingClassInsuranceAndReinsuranceBusinessMember 2018-01-01 2018-12-31 0001214816 axs:ProfessionalLinesMember axs:InsuranceMember 2018-01-01 2018-12-31 0001214816 axs:ProfessionalLinesMember axs:ReinsuranceMember 2018-01-01 2018-12-31 0001214816 axs:LiabilityInsuranceBusinessMember axs:ReinsuranceMember 2017-01-01 2017-12-31 0001214816 axs:ProfessionalLinesMember axs:InsuranceMember 2019-01-01 2019-12-31 0001214816 us-gaap:DiscontinuedOperationsDisposedOfByMeansOtherThanSaleMember 2017-02-13 2017-02-13 0001214816 axs:MotorReserveClassMember axs:ReinsuranceMember 2017-01-01 2017-12-31 0001214816 axs:CreditandSuretyBusinessMember axs:ReinsuranceMember 2018-01-01 2018-12-31 0001214816 axs:MarineMember axs:ShortTailReservingClassInsuranceAndReinsuranceBusinessMember axs:InsuranceMember 2019-01-01 2019-12-31 0001214816 axs:MotorReserveClassMember axs:ReinsuranceMember 2019-01-01 2019-12-31 0001214816 axs:MotorMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:ReinsuranceMember 2019-12-31 0001214816 axs:MotorMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member axs:ReinsuranceMember 2017-12-31 0001214816 axs:MotorMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:ReinsuranceMember 2017-12-31 0001214816 axs:MotorMember us-gaap:ShortDurationInsuranceContractsAccidentYear2018Member axs:ReinsuranceMember 2019-12-31 0001214816 axs:MotorMember us-gaap:ShortDurationInsuranceContractAccidentYear2019Member axs:ReinsuranceMember 2019-12-31 0001214816 axs:MotorMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:ReinsuranceMember 2019-12-31 0001214816 axs:MotorMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:ReinsuranceMember 2017-12-31 0001214816 axs:MotorMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:ReinsuranceMember 2016-12-31 0001214816 axs:MotorMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:ReinsuranceMember 2016-12-31 0001214816 axs:MotorMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:ReinsuranceMember 2011-12-31 0001214816 axs:MotorMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:ReinsuranceMember 2013-12-31 0001214816 axs:MotorMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:ReinsuranceMember 2017-12-31 0001214816 axs:MotorMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:ReinsuranceMember 2015-12-31 0001214816 axs:MotorMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member axs:ReinsuranceMember 2019-12-31 0001214816 axs:MotorMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:ReinsuranceMember 2018-12-31 0001214816 axs:MotorMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:ReinsuranceMember 2018-12-31 0001214816 axs:MotorMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member axs:ReinsuranceMember 2019-12-31 0001214816 axs:MotorMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:ReinsuranceMember 2015-12-31 0001214816 axs:MotorMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:ReinsuranceMember 2013-12-31 0001214816 axs:MotorMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:ReinsuranceMember 2019-12-31 0001214816 axs:MotorMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:ReinsuranceMember 2010-12-31 0001214816 axs:MotorMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:ReinsuranceMember 2017-12-31 0001214816 axs:MotorMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:ReinsuranceMember 2017-12-31 0001214816 axs:MotorMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:ReinsuranceMember 2018-12-31 0001214816 axs:MotorMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:ReinsuranceMember 2017-12-31 0001214816 axs:MotorMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:ReinsuranceMember 2019-12-31 0001214816 axs:MotorMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:ReinsuranceMember 2019-12-31 0001214816 axs:MotorMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:ReinsuranceMember 2014-12-31 0001214816 axs:MotorMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member axs:ReinsuranceMember 2017-12-31 0001214816 axs:MotorMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:ReinsuranceMember 2013-12-31 0001214816 axs:MotorMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:ReinsuranceMember 2016-12-31 0001214816 axs:MotorMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member axs:ReinsuranceMember 2016-12-31 0001214816 axs:MotorMember us-gaap:ShortDurationInsuranceContractsAccidentYear2018Member axs:ReinsuranceMember 2018-12-31 0001214816 axs:MotorMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member axs:ReinsuranceMember 2018-12-31 0001214816 axs:MotorMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:ReinsuranceMember 2015-12-31 0001214816 axs:MotorMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:ReinsuranceMember 2015-12-31 0001214816 axs:MotorMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:ReinsuranceMember 2014-12-31 0001214816 axs:MotorMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:ReinsuranceMember 2018-12-31 0001214816 axs:MotorMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:ReinsuranceMember 2018-12-31 0001214816 axs:MotorMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:ReinsuranceMember 2011-12-31 0001214816 axs:MotorMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:ReinsuranceMember 2015-12-31 0001214816 axs:MotorMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:ReinsuranceMember 2012-12-31 0001214816 axs:MotorMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:ReinsuranceMember 2016-12-31 0001214816 axs:MotorMember axs:ReinsuranceMember 2019-12-31 0001214816 axs:MotorMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:ReinsuranceMember 2014-12-31 0001214816 axs:MotorMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:ReinsuranceMember 2012-12-31 0001214816 axs:MotorMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:ReinsuranceMember 2019-12-31 0001214816 axs:MotorMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:ReinsuranceMember 2016-12-31 0001214816 axs:MotorMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:ReinsuranceMember 2013-12-31 0001214816 axs:MotorMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:ReinsuranceMember 2016-12-31 0001214816 axs:MotorMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:ReinsuranceMember 2015-12-31 0001214816 axs:MotorMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:ReinsuranceMember 2014-12-31 0001214816 axs:MotorMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:ReinsuranceMember 2014-12-31 0001214816 axs:MotorMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:ReinsuranceMember 2018-12-31 0001214816 axs:MotorMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member axs:ReinsuranceMember 2018-12-31 0001214816 axs:MotorMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:ReinsuranceMember 2012-12-31 0001214816 axs:CreditandSuretyBusinessMember axs:ReinsuranceMember 2019-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:InsuranceMember 2018-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2016-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2019-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortDurationInsuranceContractsAccidentYear2018Member axs:InsuranceMember 2019-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member axs:InsuranceMember 2019-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:InsuranceMember 2015-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:InsuranceMember 2016-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:InsuranceMember 2017-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2017-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2012-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:InsuranceMember 2019-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member axs:InsuranceMember 2016-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:InsuranceMember 2019-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member axs:InsuranceMember 2018-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member axs:InsuranceMember 2017-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:InsuranceMember 2013-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2013-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member axs:InsuranceMember 2017-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member axs:InsuranceMember 2019-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:InsuranceMember 2019-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:InsuranceMember 2016-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:InsuranceMember 2016-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2019-12-31 0001214816 axs:ProfessionalLinesMember axs:InsuranceMember 2019-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:InsuranceMember 2018-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:InsuranceMember 2018-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:InsuranceMember 2014-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2018-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2015-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:InsuranceMember 2019-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:InsuranceMember 2017-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:InsuranceMember 2017-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortDurationInsuranceContractsAccidentYear2018Member axs:InsuranceMember 2018-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member axs:InsuranceMember 2018-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:InsuranceMember 2015-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2012-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2017-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:InsuranceMember 2014-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:InsuranceMember 2017-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2013-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:InsuranceMember 2018-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2011-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2011-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:InsuranceMember 2014-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:InsuranceMember 2012-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2014-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:InsuranceMember 2015-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2014-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:InsuranceMember 2015-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2015-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2010-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2016-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortDurationInsuranceContractAccidentYear2019Member axs:InsuranceMember 2019-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:InsuranceMember 2013-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2018-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:InsuranceMember 2016-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2018-12-31 0001214816 axs:CreditAndPoliticalRiskMember axs:InsuranceMember 2019-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortDurationInsuranceContractAccidentYear2019Member axs:InsuranceMember 2019-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:InsuranceMember 2019-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:InsuranceMember 2019-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2017-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member axs:InsuranceMember 2019-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2019-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2018-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2011-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:InsuranceMember 2016-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2019-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:InsuranceMember 2017-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:InsuranceMember 2014-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:InsuranceMember 2014-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2015-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member axs:InsuranceMember 2019-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:InsuranceMember 2019-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortDurationInsuranceContractsAccidentYear2018Member axs:InsuranceMember 2019-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:InsuranceMember 2017-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:InsuranceMember 2016-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2012-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:InsuranceMember 2019-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:InsuranceMember 2017-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:InsuranceMember 2012-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member axs:InsuranceMember 2018-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:InsuranceMember 2014-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortDurationInsuranceContractsAccidentYear2018Member axs:InsuranceMember 2018-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:InsuranceMember 2018-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:InsuranceMember 2017-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2013-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2012-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member axs:InsuranceMember 2016-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2016-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:InsuranceMember 2015-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:InsuranceMember 2015-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:InsuranceMember 2013-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:InsuranceMember 2015-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2015-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2011-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:InsuranceMember 2018-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member axs:InsuranceMember 2017-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2017-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2014-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:InsuranceMember 2013-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2013-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:InsuranceMember 2018-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2016-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2010-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member axs:InsuranceMember 2018-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member axs:InsuranceMember 2017-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:InsuranceMember 2018-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:InsuranceMember 2015-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:InsuranceMember 2016-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:InsuranceMember 2016-12-31 0001214816 axs:CreditAndPoliticalRiskMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2014-12-31 0001214816 axs:AviationMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2018-12-31 0001214816 axs:AviationMember us-gaap:ShortDurationInsuranceContractAccidentYear2019Member axs:InsuranceMember 2019-12-31 0001214816 axs:AviationMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:InsuranceMember 2018-12-31 0001214816 axs:AviationMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2016-12-31 0001214816 axs:AviationMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2019-12-31 0001214816 axs:AviationMember axs:InsuranceMember 2019-12-31 0001214816 axs:AviationMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2010-12-31 0001214816 axs:AviationMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member axs:InsuranceMember 2017-12-31 0001214816 axs:AviationMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:InsuranceMember 2014-12-31 0001214816 axs:AviationMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member axs:InsuranceMember 2019-12-31 0001214816 axs:AviationMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member axs:InsuranceMember 2017-12-31 0001214816 axs:AviationMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:InsuranceMember 2019-12-31 0001214816 axs:AviationMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:InsuranceMember 2014-12-31 0001214816 axs:AviationMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:InsuranceMember 2015-12-31 0001214816 axs:AviationMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2015-12-31 0001214816 axs:AviationMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:InsuranceMember 2017-12-31 0001214816 axs:AviationMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:InsuranceMember 2013-12-31 0001214816 axs:AviationMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2012-12-31 0001214816 axs:AviationMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:InsuranceMember 2015-12-31 0001214816 axs:AviationMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2015-12-31 0001214816 axs:AviationMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:InsuranceMember 2018-12-31 0001214816 axs:AviationMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2016-12-31 0001214816 axs:AviationMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:InsuranceMember 2018-12-31 0001214816 axs:AviationMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2019-12-31 0001214816 axs:AviationMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:InsuranceMember 2017-12-31 0001214816 axs:AviationMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2013-12-31 0001214816 axs:AviationMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2011-12-31 0001214816 axs:AviationMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:InsuranceMember 2018-12-31 0001214816 axs:AviationMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2014-12-31 0001214816 axs:AviationMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member axs:InsuranceMember 2019-12-31 0001214816 axs:AviationMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:InsuranceMember 2012-12-31 0001214816 axs:AviationMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member axs:InsuranceMember 2016-12-31 0001214816 axs:AviationMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:InsuranceMember 2016-12-31 0001214816 axs:AviationMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:InsuranceMember 2015-12-31 0001214816 axs:AviationMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2014-12-31 0001214816 axs:AviationMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:InsuranceMember 2016-12-31 0001214816 axs:AviationMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2013-12-31 0001214816 axs:AviationMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:InsuranceMember 2013-12-31 0001214816 axs:AviationMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:InsuranceMember 2015-12-31 0001214816 axs:AviationMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:InsuranceMember 2014-12-31 0001214816 axs:AviationMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member axs:InsuranceMember 2018-12-31 0001214816 axs:AviationMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:InsuranceMember 2019-12-31 0001214816 axs:AviationMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:InsuranceMember 2019-12-31 0001214816 axs:AviationMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2018-12-31 0001214816 axs:AviationMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member axs:InsuranceMember 2018-12-31 0001214816 axs:AviationMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2017-12-31 0001214816 axs:AviationMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:InsuranceMember 2016-12-31 0001214816 axs:AviationMember us-gaap:ShortDurationInsuranceContractsAccidentYear2018Member axs:InsuranceMember 2019-12-31 0001214816 axs:AviationMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:InsuranceMember 2017-12-31 0001214816 axs:AviationMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:InsuranceMember 2019-12-31 0001214816 axs:AviationMember us-gaap:ShortDurationInsuranceContractsAccidentYear2018Member axs:InsuranceMember 2018-12-31 0001214816 axs:AviationMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2011-12-31 0001214816 axs:AviationMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:InsuranceMember 2017-12-31 0001214816 axs:AviationMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:InsuranceMember 2016-12-31 0001214816 axs:AviationMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2012-12-31 0001214816 axs:AviationMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2017-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:InsuranceMember 2018-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2013-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:InsuranceMember 2017-12-31 0001214816 axs:LiabilityLineMember axs:InsuranceMember 2019-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member axs:InsuranceMember 2016-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2011-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:InsuranceMember 2016-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:InsuranceMember 2013-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2018-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2016-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2018-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2015-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member axs:InsuranceMember 2018-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:InsuranceMember 2016-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2014-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:InsuranceMember 2019-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:InsuranceMember 2018-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2019-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:InsuranceMember 2019-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member axs:InsuranceMember 2017-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member axs:InsuranceMember 2018-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:InsuranceMember 2018-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2012-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:InsuranceMember 2017-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:InsuranceMember 2015-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2019-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortDurationInsuranceContractAccidentYear2019Member axs:InsuranceMember 2019-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:InsuranceMember 2019-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:InsuranceMember 2012-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2015-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortDurationInsuranceContractsAccidentYear2018Member axs:InsuranceMember 2019-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2016-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member axs:InsuranceMember 2019-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:InsuranceMember 2017-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2017-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:InsuranceMember 2016-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2012-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:InsuranceMember 2015-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:InsuranceMember 2019-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:InsuranceMember 2013-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:InsuranceMember 2014-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:InsuranceMember 2017-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2017-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:InsuranceMember 2016-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member axs:InsuranceMember 2019-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:InsuranceMember 2018-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:InsuranceMember 2015-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2014-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member axs:InsuranceMember 2017-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2011-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2010-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:InsuranceMember 2014-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortDurationInsuranceContractsAccidentYear2018Member axs:InsuranceMember 2018-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:InsuranceMember 2014-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:InsuranceMember 2015-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2013-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:ReinsuranceMember 2017-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member axs:ReinsuranceMember 2018-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:ReinsuranceMember 2012-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:ReinsuranceMember 2012-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:ReinsuranceMember 2018-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:ReinsuranceMember 2016-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:ReinsuranceMember 2019-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:ReinsuranceMember 2014-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:ReinsuranceMember 2013-12-31 0001214816 axs:PropertyandOtherReserveClassMember axs:ReinsuranceMember 2019-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortDurationInsuranceContractAccidentYear2019Member axs:ReinsuranceMember 2019-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:ReinsuranceMember 2015-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:ReinsuranceMember 2016-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:ReinsuranceMember 2014-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member axs:ReinsuranceMember 2017-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:ReinsuranceMember 2013-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:ReinsuranceMember 2019-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:ReinsuranceMember 2017-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:ReinsuranceMember 2018-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member axs:ReinsuranceMember 2016-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member axs:ReinsuranceMember 2018-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:ReinsuranceMember 2013-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:ReinsuranceMember 2014-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:ReinsuranceMember 2019-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member axs:ReinsuranceMember 2019-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:ReinsuranceMember 2015-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:ReinsuranceMember 2011-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:ReinsuranceMember 2016-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:ReinsuranceMember 2014-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:ReinsuranceMember 2017-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:ReinsuranceMember 2012-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member axs:ReinsuranceMember 2017-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:ReinsuranceMember 2016-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:ReinsuranceMember 2016-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:ReinsuranceMember 2018-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:ReinsuranceMember 2011-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:ReinsuranceMember 2015-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:ReinsuranceMember 2018-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:ReinsuranceMember 2013-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:ReinsuranceMember 2019-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:ReinsuranceMember 2019-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:ReinsuranceMember 2018-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:ReinsuranceMember 2019-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:ReinsuranceMember 2017-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortDurationInsuranceContractsAccidentYear2018Member axs:ReinsuranceMember 2018-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:ReinsuranceMember 2015-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortDurationInsuranceContractsAccidentYear2018Member axs:ReinsuranceMember 2019-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member axs:ReinsuranceMember 2019-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:ReinsuranceMember 2016-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:ReinsuranceMember 2015-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:ReinsuranceMember 2010-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:ReinsuranceMember 2015-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:ReinsuranceMember 2014-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:ReinsuranceMember 2017-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:ReinsuranceMember 2017-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:ReinsuranceMember 2018-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:ReinsuranceMember 2010-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:ReinsuranceMember 2014-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortDurationInsuranceContractsAccidentYear2018Member axs:ReinsuranceMember 2019-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:ReinsuranceMember 2016-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:ReinsuranceMember 2014-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:ReinsuranceMember 2018-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:ReinsuranceMember 2013-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:ReinsuranceMember 2015-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:ReinsuranceMember 2018-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:ReinsuranceMember 2011-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:ReinsuranceMember 2016-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:ReinsuranceMember 2014-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:ReinsuranceMember 2019-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortDurationInsuranceContractsAccidentYear2018Member axs:ReinsuranceMember 2018-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:ReinsuranceMember 2015-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:ReinsuranceMember 2013-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:ReinsuranceMember 2016-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member axs:ReinsuranceMember 2019-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:ReinsuranceMember 2017-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:ReinsuranceMember 2012-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:ReinsuranceMember 2018-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:ReinsuranceMember 2017-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:ReinsuranceMember 2019-12-31 0001214816 axs:LiabilityLineMember axs:ReinsuranceMember 2019-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortDurationInsuranceContractAccidentYear2019Member axs:ReinsuranceMember 2019-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member axs:ReinsuranceMember 2018-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:ReinsuranceMember 2019-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:ReinsuranceMember 2012-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:ReinsuranceMember 2013-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:ReinsuranceMember 2015-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:ReinsuranceMember 2012-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member axs:ReinsuranceMember 2016-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:ReinsuranceMember 2015-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:ReinsuranceMember 2015-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:ReinsuranceMember 2014-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:ReinsuranceMember 2018-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:ReinsuranceMember 2019-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:ReinsuranceMember 2019-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member axs:ReinsuranceMember 2019-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:ReinsuranceMember 2017-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:ReinsuranceMember 2017-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:ReinsuranceMember 2019-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:ReinsuranceMember 2011-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:ReinsuranceMember 2016-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:ReinsuranceMember 2015-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:ReinsuranceMember 2016-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:ReinsuranceMember 2013-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:ReinsuranceMember 2016-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member axs:ReinsuranceMember 2017-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:ReinsuranceMember 2017-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member axs:ReinsuranceMember 2018-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:ReinsuranceMember 2017-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:ReinsuranceMember 2018-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member axs:ReinsuranceMember 2017-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:ReinsuranceMember 2014-12-31 0001214816 axs:LiabilityLineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:ReinsuranceMember 2018-12-31 0001214816 axs:ReinsuranceMember 2019-01-01 2019-12-31 0001214816 axs:InsuranceMember 2019-01-01 2019-12-31 0001214816 axs:InsuranceMember 2018-01-01 2018-12-31 0001214816 axs:ReinsuranceMember 2017-01-01 2017-12-31 0001214816 axs:ReinsuranceMember 2018-01-01 2018-12-31 0001214816 axs:InsuranceMember 2017-01-01 2017-12-31 0001214816 axs:MarineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2019-12-31 0001214816 axs:MarineMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member axs:InsuranceMember 2019-12-31 0001214816 axs:MarineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:InsuranceMember 2015-12-31 0001214816 axs:MarineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2011-12-31 0001214816 axs:MarineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member axs:InsuranceMember 2018-12-31 0001214816 axs:MarineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2017-12-31 0001214816 axs:MarineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2018-12-31 0001214816 axs:MarineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:InsuranceMember 2019-12-31 0001214816 axs:MarineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:InsuranceMember 2018-12-31 0001214816 axs:MarineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member axs:InsuranceMember 2019-12-31 0001214816 axs:MarineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:InsuranceMember 2013-12-31 0001214816 axs:MarineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2012-12-31 0001214816 axs:MarineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:InsuranceMember 2014-12-31 0001214816 axs:MarineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:InsuranceMember 2017-12-31 0001214816 axs:MarineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member axs:InsuranceMember 2017-12-31 0001214816 axs:MarineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:InsuranceMember 2016-12-31 0001214816 axs:MarineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:InsuranceMember 2019-12-31 0001214816 axs:MarineMember us-gaap:ShortDurationInsuranceContractsAccidentYear2018Member axs:InsuranceMember 2019-12-31 0001214816 axs:MarineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2010-12-31 0001214816 axs:MarineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:InsuranceMember 2013-12-31 0001214816 axs:MarineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:InsuranceMember 2016-12-31 0001214816 axs:MarineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:InsuranceMember 2016-12-31 0001214816 axs:MarineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2016-12-31 0001214816 axs:MarineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:InsuranceMember 2014-12-31 0001214816 axs:MarineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:InsuranceMember 2017-12-31 0001214816 axs:MarineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:InsuranceMember 2017-12-31 0001214816 axs:MarineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:InsuranceMember 2015-12-31 0001214816 axs:MarineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2012-12-31 0001214816 axs:MarineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2014-12-31 0001214816 axs:MarineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2017-12-31 0001214816 axs:MarineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:InsuranceMember 2019-12-31 0001214816 axs:MarineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2018-12-31 0001214816 axs:MarineMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member axs:InsuranceMember 2018-12-31 0001214816 axs:MarineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:InsuranceMember 2018-12-31 0001214816 axs:MarineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2019-12-31 0001214816 axs:MarineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2013-12-31 0001214816 axs:MarineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:InsuranceMember 2018-12-31 0001214816 axs:MarineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:InsuranceMember 2016-12-31 0001214816 axs:MarineMember us-gaap:ShortDurationInsuranceContractsAccidentYear2018Member axs:InsuranceMember 2018-12-31 0001214816 axs:MarineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:InsuranceMember 2015-12-31 0001214816 axs:MarineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:InsuranceMember 2019-12-31 0001214816 axs:MarineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:InsuranceMember 2012-12-31 0001214816 axs:MarineMember us-gaap:ShortDurationInsuranceContractAccidentYear2019Member axs:InsuranceMember 2019-12-31 0001214816 axs:MarineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member axs:InsuranceMember 2016-12-31 0001214816 axs:MarineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:InsuranceMember 2018-12-31 0001214816 axs:MarineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2016-12-31 0001214816 axs:MarineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2011-12-31 0001214816 axs:MarineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:InsuranceMember 2017-12-31 0001214816 axs:MarineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:InsuranceMember 2015-12-31 0001214816 axs:MarineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:InsuranceMember 2014-12-31 0001214816 axs:MarineMember axs:InsuranceMember 2019-12-31 0001214816 axs:MarineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2015-12-31 0001214816 axs:MarineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2014-12-31 0001214816 axs:MarineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2013-12-31 0001214816 axs:MarineMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member axs:InsuranceMember 2017-12-31 0001214816 axs:MarineMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2015-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:InsuranceMember 2012-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:InsuranceMember 2014-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2014-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:InsuranceMember 2014-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member axs:InsuranceMember 2017-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member axs:InsuranceMember 2019-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:InsuranceMember 2015-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:InsuranceMember 2018-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortDurationInsuranceContractAccidentYear2019Member axs:InsuranceMember 2019-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:InsuranceMember 2015-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:InsuranceMember 2015-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2019-12-31 0001214816 axs:PropertyandOtherReserveClassMember axs:InsuranceMember 2019-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:InsuranceMember 2016-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2013-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:InsuranceMember 2013-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2016-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:InsuranceMember 2019-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:InsuranceMember 2016-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:InsuranceMember 2014-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2014-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member axs:InsuranceMember 2018-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member axs:InsuranceMember 2017-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:InsuranceMember 2019-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:InsuranceMember 2016-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:InsuranceMember 2019-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2011-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:InsuranceMember 2018-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member axs:InsuranceMember 2016-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2011-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:InsuranceMember 2017-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2013-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2010-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:InsuranceMember 2019-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2015-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member axs:InsuranceMember 2019-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2016-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2019-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:InsuranceMember 2013-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member axs:InsuranceMember 2018-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:InsuranceMember 2018-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:InsuranceMember 2017-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:InsuranceMember 2016-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:InsuranceMember 2018-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortDurationInsuranceContractsAccidentYear2018Member axs:InsuranceMember 2019-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2012-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2018-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:InsuranceMember 2017-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2017-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortDurationInsuranceContractsAccidentYear2018Member axs:InsuranceMember 2018-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2018-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:InsuranceMember 2015-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2012-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:InsuranceMember 2017-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:InsuranceMember 2017-12-31 0001214816 axs:PropertyandOtherReserveClassMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:InsuranceMember 2015-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:ReinsuranceMember 2015-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member axs:ReinsuranceMember 2016-12-31 0001214816 axs:ProfessionalLinesMember axs:ReinsuranceMember 2019-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:ReinsuranceMember 2018-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:ReinsuranceMember 2011-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:ReinsuranceMember 2012-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:ReinsuranceMember 2016-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:ReinsuranceMember 2017-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:ReinsuranceMember 2017-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:ReinsuranceMember 2018-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:ReinsuranceMember 2013-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortDurationInsuranceContractsAccidentYear2018Member axs:ReinsuranceMember 2018-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:ReinsuranceMember 2018-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:ReinsuranceMember 2012-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member axs:ReinsuranceMember 2019-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:ReinsuranceMember 2015-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:ReinsuranceMember 2013-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:ReinsuranceMember 2015-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:ReinsuranceMember 2019-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:ReinsuranceMember 2011-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:ReinsuranceMember 2016-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:ReinsuranceMember 2016-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:ReinsuranceMember 2014-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:ReinsuranceMember 2013-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:ReinsuranceMember 2012-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:ReinsuranceMember 2017-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member axs:ReinsuranceMember 2017-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:ReinsuranceMember 2013-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:ReinsuranceMember 2015-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:ReinsuranceMember 2019-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:ReinsuranceMember 2019-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:ReinsuranceMember 2019-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:ReinsuranceMember 2018-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:ReinsuranceMember 2010-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:ReinsuranceMember 2018-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:ReinsuranceMember 2017-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:ReinsuranceMember 2014-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:ReinsuranceMember 2016-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:ReinsuranceMember 2018-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member axs:ReinsuranceMember 2019-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member axs:ReinsuranceMember 2017-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member axs:ReinsuranceMember 2018-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:ReinsuranceMember 2017-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:ReinsuranceMember 2015-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:ReinsuranceMember 2015-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortDurationInsuranceContractAccidentYear2019Member axs:ReinsuranceMember 2019-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:ReinsuranceMember 2019-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:ReinsuranceMember 2016-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member axs:ReinsuranceMember 2018-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:ReinsuranceMember 2017-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortDurationInsuranceContractsAccidentYear2018Member axs:ReinsuranceMember 2019-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:ReinsuranceMember 2014-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:ReinsuranceMember 2014-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:ReinsuranceMember 2014-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:ReinsuranceMember 2016-12-31 0001214816 axs:ProfessionalLinesMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:ReinsuranceMember 2019-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member axs:ReinsuranceMember 2018-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:ReinsuranceMember 2019-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:ReinsuranceMember 2016-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortDurationInsuranceContractAccidentYear2019Member axs:ReinsuranceMember 2019-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:ReinsuranceMember 2018-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:ReinsuranceMember 2019-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member axs:ReinsuranceMember 2017-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:ReinsuranceMember 2011-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:ReinsuranceMember 2018-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member axs:ReinsuranceMember 2017-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:ReinsuranceMember 2013-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:ReinsuranceMember 2012-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:ReinsuranceMember 2015-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortDurationInsuranceContractsAccidentYear2018Member axs:ReinsuranceMember 2019-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:ReinsuranceMember 2010-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member axs:ReinsuranceMember 2019-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:ReinsuranceMember 2014-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:ReinsuranceMember 2019-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:ReinsuranceMember 2016-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:ReinsuranceMember 2016-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:ReinsuranceMember 2016-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:ReinsuranceMember 2014-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:ReinsuranceMember 2017-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:ReinsuranceMember 2019-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:ReinsuranceMember 2015-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:ReinsuranceMember 2013-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:ReinsuranceMember 2019-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:ReinsuranceMember 2014-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:ReinsuranceMember 2018-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:ReinsuranceMember 2015-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortdurationInsuranceContractsAccidentYear2015Member axs:ReinsuranceMember 2016-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:ReinsuranceMember 2013-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortdurationInsuranceContractsAccidentYear2016Member axs:ReinsuranceMember 2016-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:ReinsuranceMember 2015-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:ReinsuranceMember 2017-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member axs:ReinsuranceMember 2019-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:ReinsuranceMember 2015-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:ReinsuranceMember 2011-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:ReinsuranceMember 2012-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:ReinsuranceMember 2019-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:ReinsuranceMember 2016-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:ReinsuranceMember 2018-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:ReinsuranceMember 2017-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortDurationInsuranceContractsAccidentYear2018Member axs:ReinsuranceMember 2018-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortDurationInsuranceContractsAccidentYear2017Member axs:ReinsuranceMember 2018-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:ReinsuranceMember 2018-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortdurationInsuranceContractsAccidentYear2010Member axs:ReinsuranceMember 2018-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:ReinsuranceMember 2013-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:ReinsuranceMember 2014-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:ReinsuranceMember 2015-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortdurationInsuranceContractsAccidentYear2012Member axs:ReinsuranceMember 2017-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:ReinsuranceMember 2017-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortdurationInsuranceContractsAccidentYear2014Member axs:ReinsuranceMember 2017-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortdurationInsuranceContractsAccidentYear2011Member axs:ReinsuranceMember 2012-12-31 0001214816 axs:CreditandSuretyBusinessMember us-gaap:ShortdurationInsuranceContractsAccidentYear2013Member axs:ReinsuranceMember 2014-12-31 0001214816 axs:ReinsuranceMember 2019-12-31 0001214816 axs:InsuranceMember 2019-12-31 0001214816 axs:DekaniaNotes11MillionMember 2004-06-30 0001214816 us-gaap:LetterOfCreditMember axs:CitibankMember 2015-03-30 0001214816 us-gaap:SeniorNotesMember 2017-01-01 2017-12-31 0001214816 us-gaap:LetterOfCreditMember axs:LOCFacilityTwoMember axs:CitibankMember 2019-03-28 0001214816 axs:AXISSpecialtyFinanceLLCMember axs:A3.9SeniorNotesMember us-gaap:SeniorNotesMember 2019-06-19 0001214816 axs:AXISSpecialtyFinanceLLCMember 2019-12-31 0001214816 us-gaap:LetterOfCreditMember axs:CitibankMember 2015-03-31 0001214816 axs:SeniorNotesAxisSpecialtyFinancePLC2017Member us-gaap:SeniorNotesMember 2017-12-06 0001214816 axs:DekaniaNotes11MillionMember us-gaap:LondonInterbankOfferedRateLIBORMember 2004-06-30 2004-06-30 0001214816 us-gaap:LetterOfCreditMember axs:LOCFacilityTwoMember axs:CitibankMember 2019-12-24 0001214816 us-gaap:LetterOfCreditMember axs:LOCFacilityMember axs:CitibankMember 2017-03-27 0001214816 axs:DekaniaNotes15MillionMember us-gaap:LondonInterbankOfferedRateLIBORMember 2004-06-30 2004-06-30 0001214816 us-gaap:LetterOfCreditMember axs:CitibankMember 2013-11-20 0001214816 axs:SeniorNotesAxisSpecialtyFinanceLlc2010Member us-gaap:SeniorNotesMember 2010-03-23 0001214816 us-gaap:JuniorSubordinatedDebtMember 2019-12-10 0001214816 us-gaap:LetterOfCreditMember axs:CitibankMember 2019-12-31 0001214816 us-gaap:JuniorSubordinatedDebtMember us-gaap:UsTreasuryUstInterestRateMember 2019-12-10 2019-12-10 0001214816 axs:SeniorNotesDue2045AxisSpecialtyFinancePLC2014Member us-gaap:SeniorNotesMember 2014-03-13 0001214816 axs:AXISSpecialtyFinanceLLCMember 2010-03-23 0001214816 us-gaap:LetterOfCreditMember axs:CitibankMember 2018-12-31 0001214816 us-gaap:JuniorSubordinatedDebtMember 2019-01-01 2019-12-31 0001214816 axs:AXISSpecialtyFinanceLLCMember 2019-06-19 0001214816 axs:DekaniaNotes10MillionMember 2004-09-29 0001214816 axs:AXISSpecialtyFinancePLCMember axs:A2.65SeniorNotesMember us-gaap:SeniorNotesMember 2019-04-01 2019-04-01 0001214816 axs:DekaniaNotes10MillionMember us-gaap:LondonInterbankOfferedRateLIBORMember 2004-09-29 2004-09-29 0001214816 us-gaap:SeniorNotesMember 2018-01-01 2018-12-31 0001214816 axs:DekaniaNotes15MillionMember 2004-06-30 0001214816 axs:DekaniaNotesMember 2018-01-01 2018-12-31 0001214816 axs:SeniorNotesAxisSpecialtyFinanceLlc2010Member us-gaap:SeniorNotesMember 2019-04-01 0001214816 axs:AXISSpecialtyFinanceLLCMember 2017-12-06 0001214816 us-gaap:LetterOfCreditMember axs:LOCFacilityTwoMember axs:CitibankMember 2017-03-27 0001214816 us-gaap:SeniorNotesMember 2019-01-01 2019-12-31 0001214816 axs:AXISSpecialtyFinanceLLCMember 2014-03-13 0001214816 axs:DekaniaNotesMember 2017-01-01 2017-12-31 0001214816 axs:DekaniaNotesMember 2004-06-30 2004-09-29 0001214816 axs:AXISSpecialtyFinancePLCMember 2019-04-01 0001214816 axs:A5.15SeniorNotesMember us-gaap:SeniorNotesMember 2014-03-13 0001214816 axs:A5.875SeniorNotesMember us-gaap:SeniorNotesMember 2010-03-23 0001214816 us-gaap:JuniorSubordinatedDebtMember 2019-12-10 2019-12-10 0001214816 axs:A3.900SeniorNotesMember us-gaap:SeniorNotesMember 2019-06-19 0001214816 axs:A4.000SeniorNotesMember us-gaap:SeniorNotesMember 2017-12-06 2017-12-06 0001214816 axs:A3.900SeniorNotesMember us-gaap:SeniorNotesMember 2019-06-19 2019-06-19 0001214816 axs:A4.000SeniorNotesMember us-gaap:SeniorNotesMember 2017-12-06 0001214816 axs:A5.15SeniorNotesMember us-gaap:SeniorNotesMember 2014-03-13 2014-03-13 0001214816 axs:A5.875SeniorNotesMember us-gaap:SeniorNotesMember 2010-03-23 2010-03-23 0001214816 axs:A3.900SeniorNotesMember us-gaap:SeniorNotesMember 2018-12-31 0001214816 axs:A2.650SeniorNotesMember us-gaap:SeniorNotesMember 2019-12-31 0001214816 axs:A5.875SeniorNotesMember us-gaap:SeniorNotesMember 2018-12-31 0001214816 axs:A5.15SeniorNotesMember us-gaap:SeniorNotesMember 2018-12-31 0001214816 axs:A5.15SeniorNotesMember us-gaap:SeniorNotesMember 2019-12-31 0001214816 axs:A2.650SeniorNotesMember us-gaap:SeniorNotesMember 2018-12-31 0001214816 axs:A5.875SeniorNotesMember us-gaap:SeniorNotesMember 2019-12-31 0001214816 us-gaap:JuniorSubordinatedDebtMember 2018-12-31 0001214816 axs:A3.900SeniorNotesMember us-gaap:SeniorNotesMember 2019-12-31 0001214816 axs:A4.000SeniorNotesMember us-gaap:SeniorNotesMember 2018-12-31 0001214816 us-gaap:JuniorSubordinatedDebtMember 2019-12-31 0001214816 axs:A4.000SeniorNotesMember us-gaap:SeniorNotesMember 2019-12-31 0001214816 axs:WillisTowerWatsonPLCMember axs:PremiumsWrittenGrossMember us-gaap:CustomerConcentrationRiskMember 2019-01-01 2019-12-31 0001214816 axs:WillisTowerWatsonPLCMember axs:PremiumsWrittenGrossMember us-gaap:CustomerConcentrationRiskMember 2018-01-01 2018-12-31 0001214816 axs:ReinsurerTwoMember us-gaap:ReinsuranceRecoverableMember us-gaap:ReinsurerConcentrationRiskMember 2018-01-01 2018-12-31 0001214816 axs:MarshMcLennanCompaniesIncMember axs:PremiumsWrittenGrossMember us-gaap:CustomerConcentrationRiskMember 2017-01-01 2017-12-31 0001214816 axs:ReinsurerThreeMember us-gaap:ReinsuranceRecoverableMember us-gaap:ReinsurerConcentrationRiskMember 2019-01-01 2019-12-31 0001214816 axs:AonplcMember axs:PremiumsWrittenGrossMember us-gaap:CustomerConcentrationRiskMember 2017-01-01 2017-12-31 0001214816 axs:MarshMcLennanCompaniesIncMember axs:PremiumsWrittenGrossMember us-gaap:CustomerConcentrationRiskMember 2018-01-01 2018-12-31 0001214816 axs:PremiumsWrittenGrossMember us-gaap:CustomerConcentrationRiskMember 2019-01-01 2019-12-31 0001214816 axs:ReinsurerOneMember us-gaap:ReinsuranceRecoverableMember us-gaap:ReinsurerConcentrationRiskMember 2018-01-01 2018-12-31 0001214816 axs:PremiumsWrittenGrossMember us-gaap:CustomerConcentrationRiskMember 2018-01-01 2018-12-31 0001214816 axs:WillisTowerWatsonPLCMember axs:PremiumsWrittenGrossMember us-gaap:CustomerConcentrationRiskMember 2017-01-01 2017-12-31 0001214816 axs:PremiumsWrittenGrossMember us-gaap:CustomerConcentrationRiskMember 2017-01-01 2017-12-31 0001214816 axs:MarshMcLennanCompaniesIncMember axs:PremiumsWrittenGrossMember us-gaap:CustomerConcentrationRiskMember 2019-01-01 2019-12-31 0001214816 axs:AonplcMember axs:PremiumsWrittenGrossMember us-gaap:CustomerConcentrationRiskMember 2019-01-01 2019-12-31 0001214816 axs:AxisCorporateCapitalUKLimitedMember 2019-01-01 2019-12-31 0001214816 srt:AMBestAMinusRatingMember axs:TenLargestReinsurersMember us-gaap:ReinsuranceRecoverableMember us-gaap:ReinsurerConcentrationRiskMember 2019-01-01 2019-12-31 0001214816 us-gaap:CommercialMortgageBackedSecuritiesMember 2019-12-31 0001214816 srt:AMBestAMinusRatingMember axs:TenLargestReinsurersMember us-gaap:ReinsuranceRecoverableMember us-gaap:ReinsurerConcentrationRiskMember 2018-01-01 2018-12-31 0001214816 axs:AxisCorporateCapitalUKLimitedIIMember 2019-01-01 2019-12-31 0001214816 axs:ReinsurerOneMember us-gaap:ReinsuranceRecoverableMember us-gaap:ReinsurerConcentrationRiskMember 2019-01-01 2019-12-31 0001214816 axs:ReinsurerThreeMember us-gaap:ReinsuranceRecoverableMember us-gaap:ReinsurerConcentrationRiskMember 2018-01-01 2018-12-31 0001214816 axs:ReinsurerTwoMember us-gaap:ReinsuranceRecoverableMember us-gaap:ReinsurerConcentrationRiskMember 2019-01-01 2019-12-31 0001214816 axs:AonplcMember axs:PremiumsWrittenGrossMember us-gaap:CustomerConcentrationRiskMember 2018-01-01 2018-12-31 0001214816 axs:LloydsMember 2018-12-31 0001214816 us-gaap:CommercialMortgageBackedSecuritiesMember 2018-12-31 0001214816 axs:LloydsMember 2019-12-31 0001214816 stpr:GA 2019-12-31 0001214816 us-gaap:CommonStockMember 2016-12-31 0001214816 us-gaap:CommonStockMember 2017-12-31 0001214816 us-gaap:CommonStockMember 2018-12-31 0001214816 us-gaap:CommonStockMember 2019-12-31 0001214816 us-gaap:CommonStockMember 2018-01-01 2018-12-31 0001214816 us-gaap:CommonStockMember 2017-01-01 2017-12-31 0001214816 us-gaap:SeriesDPreferredStockMember 2019-01-01 2019-12-31 0001214816 us-gaap:SeriesDPreferredStockMember 2018-01-01 2018-12-31 0001214816 us-gaap:SeriesDPreferredStockMember 2017-01-01 2017-12-31 0001214816 us-gaap:SeriesDPreferredStockMember 2019-12-31 0001214816 us-gaap:CommonClassAMember 2017-12-31 0001214816 us-gaap:SeriesCPreferredStockMember