ATH


Line plots across dimensions of each concept
Line plots across concepts
Tables

Table of contents


us-gaap:StatementClassOfStock
us-gaap:CommonStockSharesIssued
us-gaap:StatementClassOfStock
us-gaap:PreferredStockSharesIssued
us-gaap:StatementClassOfStock
us-gaap:CommonStockSharesAuthorized
us-gaap:StatementClassOfStock
us-gaap:PreferredStockSharesAuthorized
us-gaap:StatementClassOfStock
us-gaap:CommonStockSharesOutstanding
us-gaap:StatementClassOfStock
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding
us-gaap:StatementClassOfStock
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic
us-gaap:StatementClassOfStock
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
us-gaap:StatementClassOfStock
us-gaap:EarningsPerShareBasic
us-gaap:StatementClassOfStock
us-gaap:EarningsPerShareDiluted

us-gaap:BenefitsLossesAndExpenses

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

us-gaap:GainLossOnInvestments
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems
us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeTaxExpenseBenefit
us-gaap:ConsolidationItems

us-gaap:InsuranceCommissionsAndFees
us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:InterestExpenseLongTermDebt

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:StatementClassOfStock
us-gaap:StatementClassOfStock
us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted

us-gaap:NetInvestmentIncome
us-gaap:ConsolidatedEntities
us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:OtherComprehensiveIncomeLossNetOfTax
us-gaap:StatementEquityComponents

us-gaap:OtherIncome
us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:PolicyholderBenefitsAndClaimsIncurredNet
us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:PreferredStockDividendsIncomeStatementImpact

us-gaap:PremiumsEarnedNet
us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:ProfitLoss
us-gaap:CounterpartyName, us-gaap:EquityMethodInvestmentNonconsolidatedInvestee, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:EquityMethodInvestmentNonconsolidatedInvestee
us-gaap:StatementEquityComponents

us-gaap:Revenues
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:Assets
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:BalanceSheetLocation, us-gaap:FairValueByAssetClass
us-gaap:ConsolidatedEntities, us-gaap:BalanceSheetLocation, us-gaap:InvestmentType
us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:ConsolidatedEntities, us-gaap:InvestmentType, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:EquityMethodInvestmentNonconsolidatedInvestee
us-gaap:FairValueByAssetClass, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:FairValueByAssetClass, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:InvestmentType, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:InvestmentType, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:StatementBusinessSegments
us-gaap:TransactionType

us-gaap:Liabilities
us-gaap:ConsolidatedEntities
us-gaap:EquityMethodInvestmentNonconsolidatedInvestee
us-gaap:TransactionType

us-gaap:LiabilitiesAndStockholdersEquity
us-gaap:ConsolidatedEntities

us-gaap:StockholdersEquity
us-gaap:ConsolidatedEntities

us-gaap:CashAndCashEquivalentsAtCarryingValue
us-gaap:ConsolidatedEntities

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:ShortTermInvestments
us-gaap:BalanceSheetLocation
us-gaap:BalanceSheetLocation, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:BalanceSheetLocation, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:BalanceSheetLocation, us-gaap:FairValueByMeasurementBasis
us-gaap:BalanceSheetLocation, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:BalanceSheetLocation, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:EquitySecuritiesFvNi
us-gaap:BalanceSheetLocation, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:ConsolidatedEntities, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:CounterpartyName, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:OtherAssets
dei:LegalEntity, us-gaap:ConsolidatedEntities, us-gaap:BalanceSheetLocation
us-gaap:ConsolidatedEntities

us-gaap:LongTermDebt
us-gaap:ConsolidatedEntities
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis

us-gaap:MinorityInterest

us-gaap:StockholdersEquity
us-gaap:ConsolidatedEntities

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
us-gaap:EquityMethodInvestmentNonconsolidatedInvestee
us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital
us-gaap:ConsolidatedEntities

us-gaap:RetainedEarningsAccumulatedDeficit
us-gaap:ConsolidatedEntities

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax
us-gaap:ConsolidatedEntities
us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:StatementEquityComponents

us-gaap:MinorityInterest

us-gaap:StockIssuedDuringPeriodValueNewIssues
us-gaap:StatementClassOfStock
us-gaap:StatementClassOfStock, us-gaap:StatementEquityComponents

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
us-gaap:StatementEquityComponents

us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
us-gaap:StatementEquityComponents

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetIncomeLoss

us-gaap:ProfitLoss
us-gaap:CounterpartyName, us-gaap:EquityMethodInvestmentNonconsolidatedInvestee, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:EquityMethodInvestmentNonconsolidatedInvestee
us-gaap:StatementEquityComponents
us-gaap:ConsolidationItems
us-gaap:ShareBasedCompensation

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:ProceedsFromIssuanceOfLongTermDebt

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:DeferredTaxLiabilities
us-gaap:BalanceSheetLocation

us-gaap:DeferredTaxAssetsNet

us-gaap:DeferredTaxAssetsValuationAllowance
us-gaap:ValuationAllowanceByDeferredTaxAsset

ahl:AssetsContributedToConsolidatedVIEs
us-gaap:CounterpartyName, us-gaap:RelatedPartyTransaction, us-gaap:RelatedPartyTransactionsByRelatedParty
ahl:CapOnAssetGrossBookYield

ahl:CommonStockVotingRightsMaximumVotingPowerforSingleShareholder

ahl:DeferredPolicyAcquisitionCostsDeferredSalesInducementsandPresentValueofFutureProfitsAdditions
us-gaap:AdjustmentsForNewAccountingPronouncements

ahl:DeferredPolicyAcquisitionCostsDeferredSalesInducementsandPresentValueofFutureProfitsAmortizationExpenseExcludingUnlocking

ahl:DeferredPolicyAcquisitionCostsDeferredSalesInducementsandPresentValueofFutureProfitsUnrealizedInvestmentGainsLosses

ahl:Deferredsalesinducementamortizationexpenseexcludingunlocking
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation
ahl:GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNetRecordedInOtherComprehensiveIncome

ahl:GainLossonInvestmentsandDerivatives
us-gaap:ConsolidatedEntities
us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:ConsolidationItems
ahl:Gainlossoninvestmentsnetofoffsets

ahl:IncreaseDecreaseinInterestSensitiveContractLiabilities
us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:ConsolidationItems
ahl:IntegrationRestructuringandOtherNonOperatingExpense

ahl:InterestSensitiveContractBenefitsExpense
us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:ConsolidationItems
ahl:LossonDerivativeInstrumentsNetofExpensesPretax

ahl:PaymentsforCoinsuranceAgreementContractsInvestmentType

ahl:PaymentstoAcquireInvestmentFunds
us-gaap:ConsolidatedEntities
us-gaap:RelatedPartyTransactionsByRelatedParty

ahl:Paymentstoacquireequitysecurities

ahl:ProceedsfromInvestmentFunds
us-gaap:ConsolidatedEntities
us-gaap:CounterpartyName, us-gaap:InvestmentType, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:CounterpartyName, us-gaap:InvestmentType, us-gaap:RelatedPartyTransactionsByRelatedParty, us-gaap:SubsequentEventType
us-gaap:RelatedPartyTransactionsByRelatedParty

ahl:Proceedsfromsaleofequitysecurities

ahl:ReinsuranceAgreementsDepositsonInvestmentPoliciesandContracts
us-gaap:RelatedPartyTransactionsByRelatedParty

ahl:ReinsuranceAgreementsWithdrawalsonInvestmentPoliciesandContracts
us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:ConsolidationItems
ahl:VariableInterestEntityExpenseandNoncontrollingInterest

us-gaap:AccretionAmortizationOfDiscountsAndPremiumsInvestments

us-gaap:AssumedPremiumsEarned

us-gaap:CashDivestedFromDeconsolidation

us-gaap:CededPremiumsEarned
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation
us-gaap:ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation
us-gaap:ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation
us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType, us-gaap:FinancingReceivablePortfolioSegment
us-gaap:ConcentrationRiskPercentage1
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType, us-gaap:FinancingReceivablePortfolioSegment
us-gaap:StatementGeographical, us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType, us-gaap:FinancingReceivablePortfolioSegment

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded
us-gaap:BalanceSheetLocation
us-gaap:BalanceSheetLocation, us-gaap:FinancialInstrument
us-gaap:FinancialInstrument
us-gaap:FinancialInstrument, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:InvestmentType
us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal
us-gaap:BalanceSheetLocation
us-gaap:BalanceSheetLocation, us-gaap:FinancialInstrument
us-gaap:FinancialInstrument
us-gaap:FinancialInstrument, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:InvestmentType

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease
us-gaap:BalanceSheetLocation
us-gaap:BalanceSheetLocation, us-gaap:FinancialInstrument
us-gaap:FinancialInstrument
us-gaap:InvestmentType

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold
us-gaap:BalanceSheetLocation
us-gaap:BalanceSheetLocation, us-gaap:FinancialInstrument
us-gaap:FinancialInstrument
us-gaap:FinancialInstrument, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:InvestmentType
us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:DebtSecuritiesAvailableForSalePurchasedWithCreditDeteriorationAllowanceForCreditLossAtAcquisitionDate

us-gaap:DebtSecuritiesAvailableForSalePurchasedWithCreditDeteriorationAmountAtParValue

us-gaap:DebtSecuritiesAvailableForSalePurchasedWithCreditDeteriorationAmountAtPurchasePrice

us-gaap:DebtSecuritiesAvailableForSalePurchasedWithCreditDeteriorationDiscountPremium

us-gaap:DebtSecuritiesAvailableForSaleRealizedGain

us-gaap:DebtSecuritiesAvailableForSaleRealizedGainLoss

us-gaap:DebtSecuritiesAvailableForSaleRealizedLoss

us-gaap:DebtSecuritiesTradingGainLoss

us-gaap:DebtSecuritiesTradingRealizedGainLoss

us-gaap:DebtSecuritiesTradingUnrealizedGainLoss
us-gaap:BalanceSheetLocation
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:DeferredPolicyAcquisitionCostAmortizationExpenseAssumptionChange

us-gaap:DeferredPolicyAcquisitionCostAmortizationExpenseOther

us-gaap:DeferredPolicyAcquisitionCostUnrealizedInvestmentGainLoss

us-gaap:DeferredPolicyAcquisitionCostsAdditions

us-gaap:DeferredPolicyAcquisitionCostsAndPresentValueOfFutureProfitsAmortization1

us-gaap:DeferredSalesInducementCostAmortizationExpenseAssumptionChange

us-gaap:DeferredSalesInducementCostUnrealizedGainLossOnInvestment

us-gaap:DeferredSalesInducementsAdditions

us-gaap:DeferredSalesInducementsAmortizationExpense
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship
us-gaap:DerivativeFairValueHedgeIncludedInEffectivenessGainLoss
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation

us-gaap:DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
us-gaap:DerivativeInstrumentRisk, us-gaap:IncomeStatementLocation
us-gaap:IncomeStatementLocation

us-gaap:DirectPremiumsEarned

us-gaap:DividendsPreferredStock
us-gaap:StatementEquityComponents

us-gaap:DividendsPreferredStockCash
us-gaap:StatementClassOfStock

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:EquitySecuritiesFvNiGainLoss

us-gaap:EquitySecuritiesFvNiRealizedGainLoss

us-gaap:EquitySecuritiesFvNiUnrealizedGainLoss
us-gaap:BalanceSheetLocation
us-gaap:ConsolidatedEntities
us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:FairValueAssetRecurringBasisStillHeldUnrealizedGainLossOci
us-gaap:BalanceSheetLocation, us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:FinancialInstrument, us-gaap:InvestmentType, us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss

us-gaap:FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
us-gaap:FairValueByLiabilityClass

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
us-gaap:BalanceSheetLocation, us-gaap:FairValueByAssetClass
us-gaap:BalanceSheetLocation, us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:FairValueByAssetClass
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:FinancialInstrument, us-gaap:InvestmentType, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:InvestmentType
us-gaap:InvestmentType, us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet
us-gaap:BalanceSheetLocation, us-gaap:FairValueByAssetClass
us-gaap:BalanceSheetLocation, us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:BalanceSheetLocation, us-gaap:InvestmentType
us-gaap:FairValueByAssetClass
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:FinancialInstrument, us-gaap:InvestmentType, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:InvestmentType
us-gaap:InvestmentType, us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByLiabilityClass
us-gaap:FairValueByLiabilityClass
us-gaap:ProductOrService, us-gaap:FairValueByLiabilityClass

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByLiabilityClass

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchasesSalesIssuancesSettlements
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByLiabilityClass

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByLiabilityClass

us-gaap:FairValueOptionChangesInFairValueGainLoss1
us-gaap:FinancialInstrument, us-gaap:IncomeStatementLocation

us-gaap:FinancingReceivableAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:InvestmentType

us-gaap:FinancingReceivableAllowanceForCreditLossesWriteOffs
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivableNonaccrualInterestIncome
us-gaap:InvestmentType
us-gaap:FinancingReceivablePurchasedWithCreditDeteriorationAllowanceForCreditLossAtAcquisitionDate
us-gaap:InvestmentType
us-gaap:FinancingReceivablePurchasedWithCreditDeteriorationAmountAtParValue
us-gaap:InvestmentType
us-gaap:FinancingReceivablePurchasedWithCreditDeteriorationAmountAtPurchasePrice
us-gaap:InvestmentType
us-gaap:FinancingReceivablePurchasedWithCreditDeteriorationDiscountPremium
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation
us-gaap:ForeignCurrencyCashFlowHedgeGainLossReclassifiedToEarningsNet

us-gaap:GainLossOnDerivativeInstrumentsNetPretax
us-gaap:ConsolidationItems

us-gaap:GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments
us-gaap:CounterpartyName, us-gaap:FairValueByAssetClass, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:GainLossOnSaleOfInvestments
us-gaap:CounterpartyName, us-gaap:FairValueByAssetClass, us-gaap:RelatedPartyTransactionsByRelatedParty, us-gaap:SubsequentEventType

us-gaap:GainLossOnSaleOfOtherInvestments
us-gaap:CounterpartyName, us-gaap:InvestmentType, us-gaap:RelatedPartyTransactionsByRelatedParty, us-gaap:SubsequentEventType
us-gaap:GainOnSaleOfInvestments

us-gaap:GrossInvestmentIncomeOperating
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:InvestmentType
us-gaap:InvestmentType
us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions
us-gaap:ConsolidatedEntities
us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:IncreaseDecreaseInAccruedInvestmentIncomeReceivable
us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:IncreaseDecreaseInFundsHeldUnderReinsuranceAgreements
us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:IncreaseDecreaseInInsuranceLiabilities
us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:StatementClassOfStock
us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:InvestmentIncomeInvestmentExpense
us-gaap:ConsolidatedEntities
us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:LitigationCase, us-gaap:LitigationStatus
us-gaap:LossContingencyDamagesSoughtValue

us-gaap:MinorityInterestPeriodIncreaseDecrease
us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossBeforeTax
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation

us-gaap:OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossTax
us-gaap:StatementEquityComponents

us-gaap:OtherCostAndExpenseOperating
us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:PaymentsForDerivativeInstrumentInvestingActivities

us-gaap:PaymentsForProceedsFromDerivativeInstrumentFinancingActivities

us-gaap:PaymentsForProceedsFromOtherInvestingActivities

us-gaap:PaymentsForReinsurance

us-gaap:PaymentsOfDividendsPreferredStockAndPreferenceStock

us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesDebt
us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:FinancialInstrument, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:PaymentsToAcquireMarketableSecurities

us-gaap:PaymentsToAcquireMortgageNotesReceivable
us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:PaymentsToAcquireShortTermInvestments
us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:PaymentsToAcquireTradingSecuritiesHeldforinvestment
us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:PaymentsToMinorityShareholders

us-gaap:PolicyholderBenefitsAndClaimsIncurredGross

us-gaap:PolicyholderDividends
us-gaap:StatementClassOfStock
us-gaap:PreferredStockDividendsPerShareCashPaid

us-gaap:PresentValueOfFutureInsuranceProfitsAmortizationExpense1

us-gaap:PresentValueOfFutureInsuranceProfitsAmortizationExpenseAssumptionChange

us-gaap:PresentValueOfFutureInsuranceProfitsUnrealizedGainLossOnInvestment

us-gaap:ProceedsFromAnnuitiesAndInvestmentCertificates
us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:ProceedsFromDerivativeInstrumentInvestingActivities

us-gaap:ProceedsFromIssuanceOfCommonStock
us-gaap:CounterpartyName, us-gaap:RelatedPartyTransactionsByRelatedParty, us-gaap:StatementClassOfStock

us-gaap:ProceedsFromIssuanceOfPreferredStockAndPreferenceStock

us-gaap:ProceedsFromMinorityShareholders

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities

us-gaap:ProceedsFromSaleAndCollectionOfMortgageNotesReceivable
us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities
us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:FinancialInstrument, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:ProceedsFromSaleAndMaturityOfMarketableSecurities

us-gaap:ProceedsFromSaleAndMaturityOfTradingSecuritiesHeldforinvestment
us-gaap:ConsolidatedEntities
us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:ProceedsFromSaleMaturityAndCollectionOfShorttermInvestments
us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:ProceedsFromSaleOfAvailableForSaleSecuritiesDebt

us-gaap:ProvisionForLoanLeaseAndOtherLosses

us-gaap:ProvisionForLoanLossesExpensed
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:InvestmentType

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax
us-gaap:StatementEquityComponents

us-gaap:ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountAssumed

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us-gaap:RelatedPartyTransactionPurchasesFromRelatedParty

us-gaap:RepaymentsOfAnnuitiesAndInvestmentCertificates
us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:RepaymentsOfNotesPayable
us-gaap:StatementClassOfStock
us-gaap:StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
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us-gaap:StatementClassOfStock
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us-gaap:StatementClassOfStock
us-gaap:StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited
us-gaap:StatementClassOfStock
us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation

us-gaap:StockRepurchasedAndRetiredDuringPeriodValue
us-gaap:StatementEquityComponents
us-gaap:StatementClassOfStock
us-gaap:StockRepurchasedDuringPeriodShares
us-gaap:ShareRepurchaseProgram, us-gaap:StatementClassOfStock
us-gaap:StockRepurchasedDuringPeriodValue
us-gaap:NonmonetaryTransactionType
us-gaap:TransferToInvestments
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us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation
us-gaap:UnrealizedGainLossOnForeignCurrencyDerivativesNetBeforeTax

ahl:AssetsDesignatedtoClosedBlockReinsuranceRecoverable
dei:LegalEntity, us-gaap:StatutoryAccountingPracticesByJurisdiction
ahl:BSCRratio

ahl:CarryingAmountAssetsPercentofTotal
us-gaap:BalanceSheetLocation, us-gaap:InvestmentType
us-gaap:CounterpartyName, us-gaap:InvestmentType, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:InvestmentType
us-gaap:InvestmentType, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:RelatedPartyTransactionsByRelatedParty

ahl:CommonStockAmountAuthorizedAndReservedForFutureIssuance

ahl:DeferredPolicyAcquisitionCostsDeferredSalesInducementsandPresentValueofFutureProfits

ahl:DerivativeAssetFairValueOffsetAgainstCollateralNetofNotSubjecttoMasterNettingArrangementPolicyElectionExcludingObligationtoReturnSecurities

ahl:DerivativeAssetIncludingEmbeddedDerivatives
us-gaap:HedgingDesignation

ahl:DerivativeLiabilitiesIncludingEmbeddedDerivatives
us-gaap:HedgingDesignation

ahl:DerivativeLiabilityFairValueOffsetAgainstCollateralNetofNotSubjecttoMasterNettingArrangementPolicyElectionExcludingRighttoReclaimSecurities

ahl:Derivativeassetspledgedascollateral
dei:LegalEntity, us-gaap:StatutoryAccountingPracticesByJurisdiction
ahl:EBSCapitalandSurplus
us-gaap:FairValueByAssetClass
ahl:FairValueOptionFairValueCarryingAmountAssets
us-gaap:FairValueByAssetClass, us-gaap:InvestmentSecondaryCategorization
us-gaap:FinancialInstrument
us-gaap:FinancialInstrument
ahl:FairValueOptionUnpaidPrincipalBalanceAssets
us-gaap:ConsolidatedEntities
ahl:IntercompanyInvestments
us-gaap:ConsolidatedEntities, us-gaap:CounterpartyName, us-gaap:CreditFacility
ahl:IntercompanyNoteReceivable
us-gaap:ConsolidatedEntities, us-gaap:CounterpartyName, us-gaap:CreditFacility
ahl:IntercompanyNoteReceivableInterestRate
us-gaap:ConsolidatedEntities
ahl:IntercompanyPayable
us-gaap:ConsolidatedEntities
ahl:IntercompanyReceivable

ahl:InvestmentFunds

ahl:InvestmentFundsPledgedasCollateral
us-gaap:DebtInstrument
ahl:LineofCreditFacilityCovenantTermsConsolidatedNetWorthRequirementAmount
us-gaap:TransactionType
ahl:NetCostofReinsurance

ahl:NotesReceivableFormSubsidiary

ahl:OtherInvestmentsAllowanceforCreditLoss
us-gaap:BalanceSheetLocation
us-gaap:RelatedPartyTransactionsByRelatedParty

ahl:OtherInvestmentsPledgedasCollateral
us-gaap:ProductOrService
ahl:PercentageofParticipatingPoliciesPayingDividends
ahl:Suballocationassetcategory, us-gaap:CounterpartyName, us-gaap:RelatedPartyTransaction, us-gaap:RelatedPartyTransactionsByRelatedParty
ahl:PercentageofSuballocationAssets
us-gaap:FinancialInstrument, us-gaap:InvestmentType
ahl:PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesforRepurchaseAgreementsAmortizedCost
us-gaap:ConsolidatedEntities, us-gaap:CounterpartyName, us-gaap:CreditFacility
ahl:Revolvingnotereceivableborrowingcapacity

ahl:ShortTermInvestmentsPledgedasCollateral
dei:LegalEntity, us-gaap:StatutoryAccountingPracticesByJurisdiction
ahl:StatutoryAccountingPracticesMinimumSolvencyMarginAssetsThreshold
dei:LegalEntity, us-gaap:StatutoryAccountingPracticesByJurisdiction
ahl:StatutoryAccountingPracticesMinimumSolvencyMarginPercentageofAssetsInExcessofThreshold
dei:LegalEntity, us-gaap:StatutoryAccountingPracticesByJurisdiction
ahl:StatutoryAccountingPracticesMinimumSolvencyMarginPercentageofAssetsThreshold
dei:LegalEntity, us-gaap:StatutoryAccountingPracticesByJurisdiction
ahl:StatutoryAccountingPracticesMinimumSolvencyMarginRequired
dei:LegalEntity, us-gaap:StatutoryAccountingPracticesByJurisdiction
ahl:StatutoryAccountingPracticesPermittedPracticeIncreaseDecreaseToCapitalAndSurplus
ahl:Suballocationassetcategory, us-gaap:CounterpartyName, us-gaap:RelatedPartyTransaction, us-gaap:RelatedPartyTransactionsByRelatedParty
ahl:SuballocationAssets
us-gaap:CounterpartyName, us-gaap:RelatedPartyTransaction, us-gaap:RelatedPartyTransactionsByRelatedParty

ahl:SupplementaryInsuranceInformationDeferredPolicyAcquisitionCostsDeferredSalesInducementsandPresentValueofFutureProfits
us-gaap:StatementBusinessSegments

ahl:ValueOfGuaranteesonCorporateOwnedLifeInsurance

srt:LifeInsuranceInForceAssumed

srt:LifeInsuranceInForceCeded

srt:LifeInsuranceInForceGross

srt:LifeInsuranceInForceNet

srt:LifeInsuranceInForcePercentageAssumedToNet

us-gaap:AccruedInvestmentIncomeReceivable
us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:AdvancesFromFederalHomeLoanBanks
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:AllowanceForLoanAndLeaseLossesRealEstate

us-gaap:AlternativeInvestment
us-gaap:BalanceSheetLocation
us-gaap:BalanceSheetLocation, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:BalanceSheetLocation, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:BalanceSheetLocation, us-gaap:FairValueByMeasurementBasis
us-gaap:BalanceSheetLocation, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:FairValueByMeasurementBasis, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:FairValueByMeasurementFrequency
us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:AssetsDesignatedToClosedBlock

us-gaap:AssetsDesignatedToClosedBlockAccruedInvestmentIncome

us-gaap:AssetsDesignatedToClosedBlockCashAndCashEquivalents

us-gaap:AssetsDesignatedToClosedBlockInvestments

us-gaap:AssetsDesignatedToClosedBlockMortgageLoansOnRealEstate

us-gaap:AssetsDesignatedToClosedBlockOtherClosedBlockAssets1

us-gaap:AssetsDesignatedToClosedBlockPolicyLoans

us-gaap:AssetsDesignatedToClosedBlockTradingSecuritiesDebt
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:AssetsFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:CounterpartyName
us-gaap:AssetsHeldInTrust
us-gaap:CounterpartyName, us-gaap:Range
us-gaap:Range

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
us-gaap:BalanceSheetLocation
us-gaap:BalanceSheetLocation, us-gaap:FinancialInstrument
us-gaap:FinancialInstrument
us-gaap:FinancialInstrument, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:InvestmentType
us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
us-gaap:BalanceSheetLocation
us-gaap:BalanceSheetLocation, us-gaap:FinancialInstrument
us-gaap:FinancialInstrument
us-gaap:FinancialInstrument, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:InvestmentType
us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis
us-gaap:BalanceSheetLocation
us-gaap:BalanceSheetLocation, us-gaap:FinancialInstrument
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:FinancialInstrument
us-gaap:FinancialInstrument, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:InvestmentType
us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis
us-gaap:BalanceSheetLocation

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue
us-gaap:BalanceSheetLocation

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis
us-gaap:BalanceSheetLocation
us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenFairValue
us-gaap:BalanceSheetLocation
us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCostBasis
us-gaap:BalanceSheetLocation
us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue
us-gaap:BalanceSheetLocation
us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis
us-gaap:BalanceSheetLocation
us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue
us-gaap:BalanceSheetLocation
us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost
us-gaap:BalanceSheetLocation
us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue
us-gaap:BalanceSheetLocation
us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:AvailableForSaleSecuritiesDebtSecurities
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:CashAndCashEquivalentsFairValueDisclosure
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:CashSurrenderValueOfLifeInsurance
us-gaap:Range
us-gaap:ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1

us-gaap:ClassOfWarrantOrRightOutstanding

us-gaap:ClosedBlockLiabilities

us-gaap:ClosedBlockLiabilitiesFuturePolicyBenefitsAndPolicyholderAccountBalances

us-gaap:ClosedBlockLiabilitiesOtherPolicyholderFunds

us-gaap:ClosedBlockLiabilitiesPolicyholderDividendsPayable

us-gaap:CreditRiskDerivativeLiabilitiesAtFairValue
us-gaap:DebtInstrument, us-gaap:SubsequentEventType
us-gaap:DebtInstrumentFaceAmount
us-gaap:CounterpartyName, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:DebtSecurities
us-gaap:CounterpartyName, us-gaap:SubsequentEventType

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLoss
us-gaap:BalanceSheetLocation
us-gaap:BalanceSheetLocation, us-gaap:FinancialInstrument
us-gaap:FinancialInstrument
us-gaap:FinancialInstrument, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:InvestmentType
us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger
us-gaap:BalanceSheetLocation
us-gaap:BalanceSheetLocation, us-gaap:FinancialInstrument
us-gaap:FinancialInstrument
us-gaap:FinancialInstrument, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:InvestmentType
us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
us-gaap:BalanceSheetLocation
us-gaap:BalanceSheetLocation, us-gaap:FinancialInstrument
us-gaap:FinancialInstrument
us-gaap:FinancialInstrument, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:InvestmentType
us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months
us-gaap:BalanceSheetLocation
us-gaap:BalanceSheetLocation, us-gaap:FinancialInstrument
us-gaap:FinancialInstrument
us-gaap:FinancialInstrument, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:InvestmentType
us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
us-gaap:BalanceSheetLocation
us-gaap:BalanceSheetLocation, us-gaap:FinancialInstrument
us-gaap:FinancialInstrument
us-gaap:FinancialInstrument, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:InvestmentType
us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:DebtSecuritiesAvailableForSaleRestricted

us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition
us-gaap:BalanceSheetLocation
us-gaap:BalanceSheetLocation, us-gaap:FinancialInstrument
us-gaap:FinancialInstrument
us-gaap:FinancialInstrument, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:InvestmentType
us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss
us-gaap:BalanceSheetLocation
us-gaap:BalanceSheetLocation, us-gaap:FinancialInstrument
us-gaap:FinancialInstrument
us-gaap:FinancialInstrument, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:InvestmentType
us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:DebtSecuritiesTradingRestricted

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredPolicyAcquisitionCosts
us-gaap:CounterpartyName, us-gaap:InvestmentType, us-gaap:RelatedPartyTransactionsByRelatedParty, us-gaap:SubsequentEventType
us-gaap:DeferredRevenue

us-gaap:DeferredSalesInducementsNet

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsPolicyholderLiabilities

us-gaap:DeferredTaxLiabilitiesDeferredExpenseDeferredPolicyAcquisitionCost

us-gaap:DeferredTaxLiabilitiesInvestments

us-gaap:DeferredTaxLiabilitiesOther

us-gaap:DeferredTaxLiabilitiesOtherComprehensiveIncome
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation
us-gaap:DerivativeAmountOfHedgedItem
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation

us-gaap:DerivativeAssetCollateralObligationToReturnCashOffset

us-gaap:DerivativeAssetFairValueGrossLiabilityAndObligationToReturnCashOffset

us-gaap:DerivativeAssetFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection

us-gaap:DerivativeAssets
us-gaap:BalanceSheetLocation
us-gaap:BalanceSheetLocation, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:BalanceSheetLocation, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:HedgingDesignation

us-gaap:DerivativeCollateralObligationToReturnCash

us-gaap:DerivativeCollateralObligationToReturnSecurities

us-gaap:DerivativeCollateralRightToReclaimCash

us-gaap:DerivativeCollateralRightToReclaimSecurities

us-gaap:DerivativeFairValueOfDerivativeAsset
us-gaap:HedgingDesignation

us-gaap:DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral

us-gaap:DerivativeFairValueOfDerivativeLiability
us-gaap:HedgingDesignation

us-gaap:DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral

us-gaap:DerivativeLiabilities
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:HedgingDesignation

us-gaap:DerivativeLiabilityFairValueGrossAssetAndRightToReclaimCashOffset

us-gaap:DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation
us-gaap:DerivativeNonmonetaryNotionalAmount
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:RelatedPartyTransaction, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:DueToAffiliateCurrentAndNoncurrent
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:EmbeddedDerivativeFairValueOfEmbeddedDerivativeAsset
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability
us-gaap:Range, us-gaap:MeasurementInputType
us-gaap:EmbeddedDerivativeLiabilityMeasurementInput
us-gaap:FairValueByAssetClass
us-gaap:EquityMethodInvestments
us-gaap:FairValueByAssetClass, us-gaap:InvestmentSecondaryCategorization

us-gaap:EquitySecuritiesFvNiAndWithoutReadilyDeterminableFairValue
us-gaap:BalanceSheetLocation

us-gaap:EquitySecuritiesFvNiRestricted

us-gaap:EquitySecuritiesWithoutReadilyDeterminableFairValueAmount
us-gaap:TransactionType

us-gaap:ExcessOfReportedClosedBlockLiabilitiesOverAssetsDesignatedToClosedBlock

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByLiabilityClass
us-gaap:FairValueByLiabilityClass
us-gaap:ProductOrService, us-gaap:FairValueByLiabilityClass
us-gaap:FinancialInstrument
us-gaap:FairValueOptionAggregateDifferencesLoansAndLongTermReceivables
us-gaap:FederalHomeLoanBankAdvancesBranchOfFHLBBank, us-gaap:DebtInstrument
us-gaap:FederalHomeLoanBankAdvances
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FinancialLiabilitiesFairValueDisclosure
us-gaap:FairValueByMeasurementBasis

us-gaap:FinancingReceivableAllowanceForCreditLosses
us-gaap:BalanceSheetLocation
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:InvestmentType
us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivableNonaccrualNoAllowance
ahl:DebtServiceCoverageRatio, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:LoanToValue
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivablesPeriodPastDue
ahl:DebtServiceCoverageRatio, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:LoanToValue
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivablesPeriodPastDue
ahl:DebtServiceCoverageRatio, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivableOriginatedInCurrentFiscalYear
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:LoanToValue
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivablesPeriodPastDue
ahl:DebtServiceCoverageRatio, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:LoanToValue
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivablesPeriodPastDue
ahl:DebtServiceCoverageRatio, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:LoanToValue
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivablesPeriodPastDue
ahl:DebtServiceCoverageRatio, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:LoanToValue
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivablesPeriodPastDue

us-gaap:FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivablesPeriodPastDue
us-gaap:FinancingReceivableRecordedInvestmentCurrent
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivableRecordedInvestmentNonaccrualStatus
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:LoansInsuredOrGuaranteedByGovernmentAuthorities
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivablesPeriodPastDue
us-gaap:FinancingReceivableRecordedInvestmentPastDue

us-gaap:FundsHeldUnderReinsuranceAgreementsAsset
us-gaap:BalanceSheetLocation
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:BalanceSheetLocation, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:BalanceSheetLocation, us-gaap:FairValueByMeasurementBasis
us-gaap:BalanceSheetLocation, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:CounterpartyName
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:FairValueByMeasurementBasis, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:FundsHeldUnderReinsuranceAgreementsLiability
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation
us-gaap:HedgedAssetFairValueHedgeCumulativeIncreaseDecrease
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation
us-gaap:HedgedLiabilityFairValueHedgeCumulativeIncreaseDecrease

us-gaap:IncomeTaxReceivable
us-gaap:BalanceSheetLocation

us-gaap:InvestmentRelatedLiabilities

us-gaap:Investments
us-gaap:BalanceSheetLocation
us-gaap:CounterpartyName, us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:LettersOfCreditOutstandingAmount
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByLiabilityClass
us-gaap:LiabilitiesFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:LiabilityForFuturePolicyBenefits
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:ProductOrService, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:ProductOrService, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:TransactionType
us-gaap:ProductOrService, us-gaap:Range
us-gaap:LiabilityForFuturePolicyBenefitsInterestRate
us-gaap:ConsolidatedEntities, us-gaap:CounterpartyName
us-gaap:LineOfCredit
us-gaap:DebtInstrument
us-gaap:LineOfCreditFacilityCurrentBorrowingCapacity
us-gaap:ConsolidatedEntities, us-gaap:CounterpartyName
us-gaap:LineOfCreditFacilityInterestRateAtPeriodEnd
us-gaap:ConsolidatedEntities, us-gaap:CounterpartyName
us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity
us-gaap:CounterpartyName, us-gaap:LongTermPurchaseCommitmentByCategoryOfItemPurchased
us-gaap:DebtInstrument

us-gaap:LoansInsurancePolicy
us-gaap:BalanceSheetLocation
us-gaap:BalanceSheetLocation, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:BalanceSheetLocation, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis
us-gaap:TransactionType

us-gaap:LoansPledgedAsCollateral

us-gaap:MortgageLoansOnRealEstateCommercialAndConsumerNet
ahl:DebtServiceCoverageRatio, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:NotesReceivableGross
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:LoanToValue
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivablesPeriodPastDue
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivablesPeriodPastDue, us-gaap:LoansInsuredOrGuaranteedByGovernmentAuthorities
us-gaap:ConsolidatedEntities, us-gaap:CounterpartyName
us-gaap:NotesReceivableRelatedParties

us-gaap:OperatingLossCarryforwards
us-gaap:CounterpartyName, us-gaap:OtherCommitments, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:OtherCommitment
us-gaap:OtherCommitments

us-gaap:OtherInvestments
us-gaap:BalanceSheetLocation
us-gaap:BalanceSheetLocation, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:BalanceSheetLocation, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:BalanceSheetLocation, us-gaap:FairValueByMeasurementBasis
us-gaap:BalanceSheetLocation, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:CounterpartyName, us-gaap:InvestmentType, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:CounterpartyName, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementBasis, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:OtherLiabilities
us-gaap:ConsolidatedEntities
us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:OtherPolicyholderFunds
us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesForRepurchaseAgreements

us-gaap:PolicyholderContractDeposits
us-gaap:CounterpartyName, us-gaap:LongTermPurchaseCommitmentByCategoryOfItemPurchased
us-gaap:CounterpartyName, us-gaap:LongTermPurchaseCommitmentByCategoryOfItemPurchased, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:ProductOrService, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:ProductOrService, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:TransactionType

us-gaap:PolicyholderDividendsPayable
us-gaap:StatementClassOfStock
us-gaap:PreferredStockLiquidationPreferenceValue

us-gaap:PresentValueOfFutureInsuranceProfitsAmortizationExpenseYearFive

us-gaap:PresentValueOfFutureInsuranceProfitsAmortizationExpenseYearFour

us-gaap:PresentValueOfFutureInsuranceProfitsAmortizationExpenseYearOne

us-gaap:PresentValueOfFutureInsuranceProfitsAmortizationExpenseYearThree

us-gaap:PresentValueOfFutureInsuranceProfitsAmortizationExpenseYearTwo

us-gaap:ReinsuranceRecoverables
us-gaap:CededCreditRisk
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:TransactionType

us-gaap:RestrictedCashAndCashEquivalents
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:RestrictedCashAndInvestments

us-gaap:SecuredDebtRepurchaseAgreements
us-gaap:AssetsSoldUnderAgreementsToRepurchaseMaturityPeriods

us-gaap:SecuritiesPurchasedUnderAgreementsToResell

us-gaap:SecuritiesPurchasedUnderAgreementsToResellFairValueOfCollateral
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:SecuritiesSoldUnderAgreementsToRepurchase
us-gaap:FairValueByMeasurementBasis
dei:LegalEntity, us-gaap:StatutoryAccountingPracticesByJurisdiction
us-gaap:StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithoutRegulatoryApproval
dei:LegalEntity, us-gaap:StatutoryAccountingPracticesByJurisdiction
us-gaap:StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance
us-gaap:StatementClassOfStock
us-gaap:StockRepurchaseProgramAuthorizedAmount1
us-gaap:ShareRepurchaseProgram, us-gaap:StatementClassOfStock
us-gaap:StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1

us-gaap:SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:InvestmentType

us-gaap:SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:InvestmentType
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesFairValue
us-gaap:InvestmentType

us-gaap:SupplementaryInsuranceInformationLiabilityForFuturePolicyBenefitsLossesClaimsAndLossExpenseReserves
us-gaap:StatementBusinessSegments

us-gaap:SupplementaryInsuranceInformationOtherPolicyClaimsAndBenefitsPayable
us-gaap:StatementBusinessSegments

us-gaap:TradingSecuritiesDebt

us-gaap:TranslationAdjustmentForNetInvestmentHedgeNetOfTax
us-gaap:ValuationAllowancesAndReservesType
us-gaap:ValuationAllowancesAndReservesBalance

us-gaap:ValueOfBusinessAcquiredVOBA

us-gaap:VariableInterestEntityEntityMaximumLossExposureAmount
us-gaap:BalanceSheetLocation, us-gaap:FairValueByAssetClass
us-gaap:BalanceSheetLocation, us-gaap:InvestmentType
us-gaap:FairValueByAssetClass
us-gaap:FairValueByAssetClass, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:InvestmentType
us-gaap:InvestmentType, us-gaap:RelatedPartyTransactionsByRelatedParty

Plots across concepts


IncomeStatement
Net Income Loss
Balance Sheet
Short Term Investments
Assets
Other Assets
Current Assets
Cash And Cash Equivalents At Carrying Value
Liabilities
Derivative Liabilities
Noncurrent Liabilities
Minority Interest
Stockholders Equity
Accumulated Other Comprehensive Income Loss Net Of Tax
CashFlow
Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInOperatingActivities
Net Cash Provided By Used In Operating Activities
NetCashProvidedByUsedInInvestingActivities
Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInFinancingActivities
Payments For Repurchase Of Common Stock
DividendsAndRepurchase
Payments For Repurchase Of Common Stock

Tables

  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
 us-gaap:CommonStockSharesIssued us-gaap:StatementClassOfStock ahl:CommonClassM1NANA0.00.00.00.03.3NANANANANANANANA3.388893.388893.4315473.474205NANANA5.198273NANANA
 us-gaap:CommonStockSharesIssued us-gaap:StatementClassOfStock ahl:CommonClassM2NANA0.00.00.00.00.8NANANANANANANANA0.8679230.8679230.9745631.067747NANANA3.125869NANANA
 us-gaap:CommonStockSharesIssued us-gaap:StatementClassOfStock ahl:CommonClassM3NANA0.00.00.00.01.0NANANANANANANANA1.2531.2671.346651.3463NANANA3.11NANANA
 us-gaap:CommonStockSharesIssued us-gaap:StatementClassOfStock ahl:CommonClassM4NANA0.00.00.00.04.0NANANANANANANANA4.7932124.9417055.3454325.397802NANANA5.038443NANANA
 us-gaap:CommonStockSharesIssued us-gaap:StatementClassOfStock us-gaap:CommonClassA██████▁191.9191.7191.5191.5194.3194.3143.2NANANANANANANANA120.108463119.510182101.5636577.319381NANANA50.151265NANANA
 us-gaap:CommonStockSharesIssued us-gaap:StatementClassOfStock us-gaap:CommonClassBNANA0.00.00.00.025.4NANANANANANANANA69.54491470.0925687.775578111.805829NANANA135.963975NANANA
 us-gaap:PreferredStockSharesIssued us-gaap:StatementClassOfStock us-gaap:SeriesAPreferredStock▄▄▄▄▄▄▄▄0.00.00.00.00.00.00.00.0NANA0.0NANANANANANANANANANANANANANANA
 us-gaap:PreferredStockSharesIssued us-gaap:StatementClassOfStock us-gaap:SeriesBPreferredStock▁▁▁▁█▁▁▁0.00.00.00.00.01380.00.00.0NANA0.0NANANANANANANANANANANANANANANA
 us-gaap:CommonStockSharesAuthorized us-gaap:StatementClassOfStock ahl:CommonClassM1NANA0.00.00.00.07.1NANANANANANANANA7.109567.109567.109567.10956NANANA7.10956NANANA
 us-gaap:CommonStockSharesAuthorized us-gaap:StatementClassOfStock ahl:CommonClassM2NANA0.00.00.00.05.0NANANANANANANANA5.05.05.05.0NANANA5.0NANANA
 us-gaap:CommonStockSharesAuthorized us-gaap:StatementClassOfStock ahl:CommonClassM3NANA0.00.00.00.07.5NANANANANANANANA7.57.57.57.5NANANA7.5NANANA
 us-gaap:CommonStockSharesAuthorized us-gaap:StatementClassOfStock ahl:CommonClassM4NANA0.00.00.00.07.5NANANANANANANANA7.57.57.57.5NANANA7.5NANANA
 us-gaap:CommonStockSharesAuthorized us-gaap:StatementClassOfStock us-gaap:CommonClassBNANA0.00.00.00.0325.0NANANANANANANANA325.0325.0325.0325.0NANANA325.0NANANA
 us-gaap:PreferredStockSharesAuthorized us-gaap:StatementClassOfStock us-gaap:SeriesAPreferredStock▁▁▁▁███▁0.00.00.00.00.03450.03450.03450.0NANA0.0NANANANANANANANANANANANANANANA
 us-gaap:PreferredStockSharesAuthorized us-gaap:StatementClassOfStock us-gaap:SeriesBPreferredStock▁▁▁▁███▁0.00.00.00.00.01380.01380.01380.0NANA0.0NANANANANANANANANANANANANANANA
 us-gaap:PreferredStockSharesAuthorized us-gaap:StatementClassOfStock us-gaap:SeriesCPreferredStock▁▁▁▁█0.00.00.00.00.024NA0.0NANANANANANANANANANANANANANANANANANANA
 us-gaap:CommonStockSharesOutstanding us-gaap:StatementClassOfStock ahl:CommonClassM1NANA0.00.00.00.03.3NANANA3.4NANANA3.388893.388893.388893.4315473.474205NANANA5.198273NANANA
 us-gaap:CommonStockSharesOutstanding us-gaap:StatementClassOfStock ahl:CommonClassM2NANA0.00.00.00.00.8NANANA0.8NANANA0.8511030.8679230.8679230.9745631.067747NANANA3.125869NANANA
 us-gaap:CommonStockSharesOutstanding us-gaap:StatementClassOfStock ahl:CommonClassM3NANA0.00.00.00.01.0NANANA1.0NANANA1.0921.2531.2671.346651.3463NANANA3.11NANANA
 us-gaap:CommonStockSharesOutstanding us-gaap:StatementClassOfStock ahl:CommonClassM4NANA0.00.00.00.04.0NANANA4.1NANANA4.7117434.7932124.9417055.3454325.397802NANANA5.038443NANANA
 us-gaap:CommonStockSharesOutstanding us-gaap:StatementClassOfStock us-gaap:CommonClassA██████▁191.9191.7191.5191.5194.3194.3143.2NANANA162.4NANANA142.386704120.108463119.510182101.5636577.319381NANANA50.151265NANANA
 us-gaap:CommonStockSharesOutstanding us-gaap:StatementClassOfStock us-gaap:CommonClassBNANA0.00.00.00.025.4NANANA25.4NANANA47.42239969.54491470.0925687.775578111.805829NANANA135.963975NANANA
 us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding us-gaap:StatementClassOfStock us-gaap:CommonClassA█▁198.2196.8NA197.1196.9161.4NA152.0158.8161.7NA165.057062164.828108148.952105NA119.892269109.00599281.297593NA49.90644850.14175850.081765NANANANA
 us-gaap:WeightedAverageNumberOfSharesOutstandingBasic us-gaap:StatementClassOfStock us-gaap:CommonClassA█▁191.5191.3NA193.1193.9161.4NA151.6158.5161.3NA164.52768164.458153148.693902NA119.519911106.2992378.246213NA49.79896350.05627650.028933NANANANA
 us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount us-gaap:StatementClassOfStock us-gaap:CommonClassA▁█0.61.0NA2.83.311.1NA32.031.634.7NA34.90864435.07863535.212154NA79.93109974.091.666275NA135.963975136.0135.963975NANANANA
 us-gaap:EarningsPerShareBasic us-gaap:StatementClassOfStock ahl:CommonClassM1NANA0.00.00.0-3.872.431.53.763.65-0.533.241.341.362.361.41.661.941.94NANANANANANANA
 us-gaap:EarningsPerShareBasic us-gaap:StatementClassOfStock ahl:CommonClassM2NANA0.00.00.0-3.872.431.53.763.65-0.533.241.341.362.361.41.661.94NANANANANANANANA
 us-gaap:EarningsPerShareBasic us-gaap:StatementClassOfStock ahl:CommonClassM3NANA0.00.00.0-3.872.431.53.763.65-0.533.241.341.362.361.41.66NANANANANANANANANA
 us-gaap:EarningsPerShareBasic us-gaap:StatementClassOfStock ahl:CommonClassM4NANA0.00.00.0-3.872.431.53.763.65-0.533.241.341.362.361.41.66NANANANANANANANANA
 us-gaap:EarningsPerShareBasic us-gaap:StatementClassOfStock us-gaap:CommonClassA█▆▇▆▆▁▅▅▆▆▄▆▅▅▅▅▅▅▅▅▅▄▅▄▄▅7.213.025.573.224.25-5.812.431.53.763.65-0.533.241.341.362.361.41.661.941.940.851.030.471.30.390.561.01
 us-gaap:EarningsPerShareBasic us-gaap:StatementClassOfStock us-gaap:CommonClassBNANA0.00.00.0-3.872.431.53.763.65-0.533.241.341.362.361.41.661.941.940.851.030.471.30.390.561.01
 us-gaap:EarningsPerShareDiluted us-gaap:StatementClassOfStock ahl:CommonClassM1NANA0.00.00.0-3.872.431.53.763.65-0.533.241.341.362.361.41.661.940.46NANANANANANANA
 us-gaap:EarningsPerShareDiluted us-gaap:StatementClassOfStock ahl:CommonClassM2NANA0.00.00.0-3.872.431.53.763.65-0.533.241.331.342.341.391.640.08NANANANANANANANA
 us-gaap:EarningsPerShareDiluted us-gaap:StatementClassOfStock ahl:CommonClassM3NANA0.00.00.0-3.872.431.53.763.65-0.533.241.341.332.11.071.0NANANANANANANANANA
 us-gaap:EarningsPerShareDiluted us-gaap:StatementClassOfStock ahl:CommonClassM4NANA0.00.00.0-3.872.131.293.283.15-0.532.491.040.941.490.790.76NANANANANANANANANA
 us-gaap:EarningsPerShareDiluted us-gaap:StatementClassOfStock us-gaap:CommonClassA█▆▇▆▆▁▆▅▆▆▄▆▅▅▅▅▅▅▅▅▅▄▅▄▄▅6.972.945.443.164.19-5.812.421.53.753.64-0.533.231.331.362.351.391.651.871.80.851.030.471.30.390.561.01
 us-gaap:EarningsPerShareDiluted us-gaap:StatementClassOfStock us-gaap:CommonClassBNANA0.00.00.0-3.872.431.53.763.65-0.533.241.341.362.361.41.661.941.940.851.030.471.30.390.561.01
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
us-gaap:BenefitsLossesAndExpenses ▅▅█▃▄▁▄▅▄▅▂▃▃▂▄▂▃▂▂▂▂▂▂▁▂▂4433.04252.07157.02251.03317.0-167.02723.04222.02619.04221.01301.01882.01467.0684.03374.01179.01426.01224.0676.01205.0839.0634.0825.0149.0413.0637.0
us-gaap:ComprehensiveIncomeNetOfTax ▇▄▆▆█▁▅▅▆▆2733.0-1336.02176.01356.04201.0-4496.0324.0975.01774.01886.0NANANANA530.0376.0713.0679.0-152.0477.0814.0272.0NANANANA
us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest █▁▇▆▇▃513.0-713.0309.0246.0338.0-352.0NANA0.00.0NANANANA0.00.00.00.00.00.00.00.0NANANANA
us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest ▇▃▆▆█▁▅▅▆▆▄▅▄▄▅▅▅▅▅▅▅▅3246.0-2049.02485.01602.04539.0-4848.0320.0975.01774.01886.0-668.0557.0-195.0-520.0530.0376.0713.0679.0-152.0477.0814.0272.0NANANANA
us-gaap:GainLossOnInvestments █▄█▇█▁▆▆▇▇2610.0-488.02536.01797.02548.0-3572.0965.0665.01313.01776.0NANANANANANANANANANANANANANANANA
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest █▄▇▆▆▁▅▄▅▅▃▅▅▅▅▄▅▅▅▄▄▄1990.0139.01483.01024.01081.0-1382.0533.0279.0750.0740.0-188.0706.0330.0327.0498.0294.0337.0395.0422.038.0208.088.0NANANANA
us-gaap:IncomeTaxExpenseBenefit █▆█▇▇▁▆▄▅▅▃▆▆▆▅▅▅▅▅▃▅▄184.062.0161.0140.0150.0-166.069.0-14.030.032.0-69.066.066.059.034.020.011.022.021.0-88.015.01.0NANANANA
us-gaap:InsuranceCommissionsAndFees █▆▆▅▄▄▃▃▃▁157.0150.0146.0144.0141.0140.0132.0135.0132.0125.0NANANANANANANANANANANANANANANANA
us-gaap:InterestExpenseLongTermDebt 25.0NANANA18.0NANANANANA11.010.011.0NANANANANANANANANANANANANA
us-gaap:NetIncomeLoss █▆▇▆▆▁▅▅▆▆▄▆▅▅▅▅▅▅▅▄▅▄▅▄▄▄1417.0614.01093.0652.0843.0-1047.0451.0293.0720.0708.0-104.0640.0264.0268.0464.0274.0326.0373.0368.0158.0192.087.0242.072.0104.0144.0
us-gaap:NetIncomeLossAttributableToNoncontrollingInterest █▁▇▇▆▄▅▅▅▅389.0-537.0229.0232.088.0-169.013.00.00.00.0NANANANA0.00.00.00.00.00.00.00.0NANANANA
us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic █▆▇▆▆▁▅▅▆▆▄▆▅▅1382.0578.01065.0622.0824.0-1065.0432.0276.0720.0708.0-104.0623.0257.0277.0NANANANANANANANANANANANA
 us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted us-gaap:StatementClassOfStock ahl:CommonClassM1NANA0.00.00.0-13.08.05.013.012.0-2.011.05.05.08.05.06.07.0NANANANANANANANA
 us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted us-gaap:StatementClassOfStock ahl:CommonClassM2NANA0.00.00.0-3.03.01.03.03.0-1.03.01.01.02.01.02.00.0NANANANANANANANA
 us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted us-gaap:StatementClassOfStock ahl:CommonClassM3NANA0.00.00.0-4.02.02.04.03.0-1.03.01.01.02.01.01.0NANANANANANANANANA
 us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted us-gaap:StatementClassOfStock ahl:CommonClassM4NANA0.00.00.0-9.07.03.08.08.0-2.07.03.03.05.02.02.0NANANANANANANANANA
 us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted us-gaap:StatementClassOfStock us-gaap:CommonClassA█▆▇▆▆▁▅▅▆▆▄▅▄▄▅▄▄▄▄▄▄1382.0578.01065.0622.0824.0-938.0349.0227.0596.0589.0-89.0534.0220.0202.0294.0167.0181.0156.0106.034.052.0NANANANANA
 us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted us-gaap:StatementClassOfStock us-gaap:CommonClassBNANA0.00.00.0-98.063.038.096.093.0-25.083.034.056.0162.098.0138.0221.0257.092.0141.0NANANANANA
us-gaap:NetInvestmentIncome █▆▆▄▄▁▃▃▃▃2038.01704.01595.01209.01336.0745.01168.01090.01182.01082.0NANANANANANANANANANANANANANANANA
us-gaap:OtherComprehensiveIncomeLossNetOfTax ▆▂▆▅█▁▄▅▆▆▄▄▄▄▅▅▅▅▄▅▅▅1440.0-2126.01163.0718.03608.0-3632.0-144.0682.01054.01178.0-549.0-83.0-459.0-788.066.0102.0387.0306.0-553.0351.0621.0185.0NANANANA
us-gaap:OtherIncome █▆▄▆▇▁▅▄▄▅20.014.07.013.018.0-2.010.06.09.012.0NANANANANANANANANANANANANANANANA
us-gaap:PolicyholderBenefitsAndClaimsIncurredNet ▃▆█▁▁▃▂▅▂▄1950.03317.04718.0439.0674.01356.01192.02955.01111.02329.0NANANANANANANANANANANANANANANANA
us-gaap:PreferredStockDividendsIncomeStatementImpact ██▆▇▅▄▅▄▁▁▁▁35.036.028.030.019.018.019.017.00.00.00.00.0NANANANANANANANANANANANANANA
us-gaap:PremiumsEarnedNet ▃▆█▁▁▃▂▅▂▄1598.03011.04356.0112.0355.01140.0907.02688.0787.02000.0NANANANANANANANANANANANANANANANA
us-gaap:ProfitLoss █▄▇▆▆▁▅▄▅▅▄▅▄▄▅▄▅▅▅▄▄▄▄▄▄▄1806.077.01322.0884.0931.0-1216.0464.0293.0720.0708.0-104.0640.0264.0268.0464.0274.0326.0373.0368.0158.0192.087.0242.072.0104.0160.0
us-gaap:Revenues ▆▅█▄▅▁▄▅▄▅▃▄▃▃▅▃▃▃▃▃▃▃▃▂▂▃6423.04391.08640.03275.04398.0-1549.03256.04501.03369.04961.01154.02588.01797.01011.03872.01473.01763.01619.01062.01276.01047.0722.01045.0224.0544.0803.0
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
us-gaap:Assets █▇▇▇▆▄▄▄▄▄▃▃▃▁▂▂▁▁▁215549.0205670.0202771.0191088.0183241.0142179.0146875.0144202.0138980.0132857.0125505.0118204.0114755.093557.099747.096061.093594.089220.086720.0NANANA80854.0NANANA
us-gaap:Liabilities ██▇▇▆▄▄▄▄▄▃▃▃▁▂▁▁▁▁193878.0187334.0182631.0173971.0167602.0131649.0132734.0130657.0126615.0122740.0117229.0109135.0106250.084862.090539.087392.085310.081623.079814.0NANANA75491.0NANANA
us-gaap:LiabilitiesAndStockholdersEquity █▇▇▇▆▄▄▄▄▄▃▃▃▁▂▂▁▁▁215549.0205670.0202771.0191088.0183241.0142179.0146875.0144202.0138980.0132857.0125505.0118204.0114755.093557.099747.096061.093594.089220.086720.0NANANA80854.0NANANA
us-gaap:StockholdersEquity █▆▇▅▄▁▃20006.017291.018657.015943.014711.09940.013391.0NANANA8276.0NANANA9208.08669.08284.07597.06905.0NANANA5362.0NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
us-gaap:CashAndCashEquivalentsAtCarryingValue █▅▇▇▅▃▁8057.06427.07704.07548.06240.05419.04240.0NANANA3405.0NANANA4892.03608.03480.02565.02459.02567.03313.02737.02720.0NANANA
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents █▆██▇▅▃▃▄▂▂▃▂▁▄▂▂▁▁8726.06973.08442.08774.07521.05983.04642.04035.05239.03520.03405.03943.03788.02825.04997.03708.03585.02638.02516.0NANANA2836.0NANANA
us-gaap:ShortTermInvestments NANANA165.0NANA596.0NANANANANANANANANANANANANANANANANANANA
 us-gaap:ShortTermInvestments us-gaap:BalanceSheetLocation ahl:InvestmentsExcludingInvestmentsInRelatedParty▁▂█101.0125.0222.0NANANA596.0NANANANANANANANANANANANANANANANANANANA
 us-gaap:ShortTermInvestments us-gaap:BalanceSheetLocation,us-gaap:FairValueByFairValueHierarchyLevel,us-gaap:FairValueByMeasurementBasis ahl:InvestmentsExcludingInvestmentsInRelatedParty,us-gaap:FairValueInputsLevel3,us-gaap:EstimateOfFairValueFairValueDisclosureNA8.0NANANANA190.0NANANANANANANANANANANANANANANANANANANA
 us-gaap:ShortTermInvestments us-gaap:BalanceSheetLocation,us-gaap:FairValueByFairValueHierarchyLevel,us-gaap:FairValueByMeasurementFrequency ahl:InvestmentsExcludingInvestmentsInRelatedParty,us-gaap:FairValueInputsLevel1,us-gaap:FairValueMeasurementsRecurring▂▁█58.051.0146.0NANANA46.0NANANANANANANANANANANANANANANANANANANA
 us-gaap:ShortTermInvestments us-gaap:BalanceSheetLocation,us-gaap:FairValueByFairValueHierarchyLevel,us-gaap:FairValueByMeasurementFrequency ahl:InvestmentsExcludingInvestmentsInRelatedParty,us-gaap:FairValueInputsLevel2,us-gaap:FairValueMeasurementsRecurring▁▆█43.066.074.0NANANA319.0NANANANANANANANANANANANANANANANANANANA
 us-gaap:ShortTermInvestments us-gaap:BalanceSheetLocation,us-gaap:FairValueByFairValueHierarchyLevel,us-gaap:FairValueByMeasurementFrequency ahl:InvestmentsExcludingInvestmentsInRelatedParty,us-gaap:FairValueInputsLevel3,us-gaap:FairValueMeasurementsRecurringNANA2.0NANANA41.0NANANANANANANANANANANANANANANANANANANA
 us-gaap:ShortTermInvestments us-gaap:BalanceSheetLocation,us-gaap:FairValueByMeasurementBasis ahl:InvestmentsExcludingInvestmentsInRelatedParty,us-gaap:CarryingReportedAmountFairValueDisclosureNA8.0NANANANA190.0NANANANANANANANANANANANANANANANANANANA
 us-gaap:ShortTermInvestments us-gaap:BalanceSheetLocation,us-gaap:FairValueByMeasurementBasis ahl:InvestmentsExcludingInvestmentsInRelatedParty,us-gaap:EstimateOfFairValueFairValueDisclosureNA8.0NANANANA190.0NANANANANANANANANANANANANANANANANANANA
 us-gaap:ShortTermInvestments us-gaap:BalanceSheetLocation,us-gaap:FairValueByMeasurementBasis,us-gaap:FairValueByMeasurementFrequency ahl:InvestmentsExcludingInvestmentsInRelatedParty,us-gaap:EstimateOfFairValueFairValueDisclosure,us-gaap:FairValueMeasurementsRecurring▁▂█101.0117.0222.0NANANA406.0NANANANANANANANANANANANANANANANANANANA
 us-gaap:ShortTermInvestments us-gaap:FairValueByFairValueHierarchyLevel,us-gaap:FairValueByMeasurementFrequency us-gaap:FairValueInputsLevel1,us-gaap:FairValueMeasurementsRecurringNANANA45.043.042.046.0NANANANANANANANANANANANANANANANANANANA
 us-gaap:ShortTermInvestments us-gaap:FairValueByFairValueHierarchyLevel,us-gaap:FairValueByMeasurementFrequency us-gaap:FairValueInputsLevel2,us-gaap:FairValueMeasurementsRecurringNANANA110.0207.0284.0319.0NANANANANANANANANANANANANANANANANANANA
 us-gaap:ShortTermInvestments us-gaap:FairValueByFairValueHierarchyLevel,us-gaap:FairValueByMeasurementFrequency us-gaap:FairValueInputsLevel3,us-gaap:FairValueMeasurementsRecurringNANANA10.0114.067.041.0NANANANANANANANANANANANANANANANANANANA
 us-gaap:ShortTermInvestments us-gaap:FairValueByMeasurementBasis,us-gaap:FairValueByMeasurementFrequency us-gaap:EstimateOfFairValueFairValueDisclosure,us-gaap:FairValueMeasurementsRecurringNANANA165.0364.0393.0406.0NANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
 us-gaap:EquitySecuritiesFvNi us-gaap:BalanceSheetLocation,us-gaap:FairValueByFairValueHierarchyLevel,us-gaap:FairValueByMeasurementFrequency ahl:InvestmentsExcludingInvestmentsInRelatedParty,us-gaap:FairValueInputsLevel1,us-gaap:FairValueMeasurementsRecurring█▁▅76.036.057.0NANANA43.0NANANANANANANANANANANANANANANANANANANA
 us-gaap:EquitySecuritiesFvNi us-gaap:BalanceSheetLocation,us-gaap:FairValueByFairValueHierarchyLevel,us-gaap:FairValueByMeasurementFrequency ahl:InvestmentsExcludingInvestmentsInRelatedParty,us-gaap:FairValueInputsLevel2,us-gaap:FairValueMeasurementsRecurring█▃▁300.0272.0262.0NANANA201.0NANANANANANANANANANANANANANANANANANANA
 us-gaap:EquitySecuritiesFvNi us-gaap:BalanceSheetLocation,us-gaap:FairValueByFairValueHierarchyLevel,us-gaap:FairValueByMeasurementFrequency ahl:InvestmentsExcludingInvestmentsInRelatedParty,us-gaap:FairValueInputsLevel3,us-gaap:FairValueMeasurementsRecurring█▃▁22.014.011.0NANANA3.0NANANANANANANANANANANANANANANANANANANA
 us-gaap:EquitySecuritiesFvNi us-gaap:BalanceSheetLocation,us-gaap:FairValueByMeasurementBasis,us-gaap:FairValueByMeasurementFrequency ahl:InvestmentsExcludingInvestmentsInRelatedParty,us-gaap:EstimateOfFairValueFairValueDisclosure,us-gaap:FairValueMeasurementsRecurring█▁▂398.0322.0330.0NANANA247.0NANANANANANANANANANANANANANANANANANANA
 us-gaap:EquitySecuritiesFvNi us-gaap:ConsolidatedEntities,us-gaap:RelatedPartyTransactionsByRelatedParty us-gaap:VariableInterestEntityPrimaryBeneficiary,srt:AffiliatedEntityNANA0.00.00.00.06.0NANANANANANANANANANANANANANANANANANANA
 us-gaap:EquitySecuritiesFvNi us-gaap:CounterpartyName,us-gaap:RelatedPartyTransactionsByRelatedParty ahl:AAInfrastructure,srt:AffiliatedEntityNANA72.050.052.049.058.0NANANANANANANANANANANANANANANANANANANA
 us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByFairValueHierarchyLevel,us-gaap:FairValueByMeasurementFrequency us-gaap:FairValueInputsLevel1,us-gaap:FairValueMeasurementsRecurringNANANA29.028.023.043.0NANANANANANANANANANANANANANANANANANANA
 us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByFairValueHierarchyLevel,us-gaap:FairValueByMeasurementFrequency us-gaap:FairValueInputsLevel2,us-gaap:FairValueMeasurementsRecurringNANANA220.0203.0176.0201.0NANANANANANANANANANANANANANANANANANANA
 us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByFairValueHierarchyLevel,us-gaap:FairValueByMeasurementFrequency us-gaap:FairValueInputsLevel3,us-gaap:FairValueMeasurementsRecurringNANANA16.06.07.03.0NANANANANANANANANANANANANANANANANANANA
 us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByFairValueHierarchyLevel,us-gaap:FairValueByMeasurementFrequency,us-gaap:RelatedPartyTransactionsByRelatedParty us-gaap:FairValueInputsLevel3,us-gaap:FairValueMeasurementsRecurring,srt:AffiliatedEntity██▃▁▁▁▃115.0114.072.050.052.049.064.0NANANANANANANANANANANANANANANANANANANA
 us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByMeasurementBasis,us-gaap:FairValueByMeasurementFrequency us-gaap:EstimateOfFairValueFairValueDisclosure,us-gaap:FairValueMeasurementsRecurringNANANA265.0237.0206.0247.0NANANANANANANANANANANANANANANANANANANA
 us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByMeasurementBasis,us-gaap:FairValueByMeasurementFrequency,us-gaap:RelatedPartyTransactionsByRelatedParty us-gaap:EstimateOfFairValueFairValueDisclosure,us-gaap:FairValueMeasurementsRecurring,srt:AffiliatedEntity██▃▁▁▁▃115.0114.072.050.052.049.064.0NANANANANANANANANANANANANANANANANANANA
 us-gaap:EquitySecuritiesFvNi us-gaap:RelatedPartyTransactionsByRelatedParty srt:AffiliatedEntity██▃▁▁▁▃115.0114.072.050.052.049.064.0NANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
us-gaap:LongTermDebt █▆▆▃▃▁▁2468.01977.01976.01487.01486.0986.0992.0NANANANANANANANANANANANANANANANANANANA
us-gaap:MinorityInterest █▄▇▅▃▁▂1665.01045.01483.01174.0928.0590.0750.0NANANA0.0NANANA0.00.00.00.01.0NANANA1.0NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
us-gaap:StockholdersEquity █▆▇▅▄▁▃20006.017291.018657.015943.014711.09940.013391.0NANANA8276.0NANANA9208.08669.08284.07597.06905.0NANANA5362.0NANANA
us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest █▇▇▆▅▃▅▅▄▃▂▃▂▂▃▂▂▂▂▂▁▁▁21671.018336.020140.017117.015639.010530.014141.013545.012365.010117.08276.09069.08505.08695.09208.08669.08284.07597.06906.07031.06427.05639.05363.0NANANA
us-gaap:AdditionalPaidInCapital ███▇▇▆▃▃▃▁▁▁▁▁▁▁▁▁▁6640.06623.06613.06045.06090.05501.04171.04435.04144.03448.03462.03499.03492.03485.03472.03461.03452.03436.03421.0NANANA3281.0NANANA
us-gaap:RetainedEarningsAccumulatedDeficit █▇▆▅▄▄▅▅▄▄▃▃▃▃▂▂▂▁▁10029.08647.08073.07010.06437.05613.06939.06668.06461.05963.05286.05527.04887.04625.04321.04046.03772.03488.03117.0NANANA2318.0NANANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▇▅█▇▆▁▆▆▅▄▂▃▃▃▅▄▄▄▃3337.02021.03971.02888.02184.0-1174.02281.02442.01760.0706.0-472.043.0126.0585.01415.01162.01060.0673.0367.0NANANA-237.0NANANA
us-gaap:MinorityInterest █▄▇▅▃▁▂1665.01045.01483.01174.0928.0590.0750.0NANANA0.0NANANA0.00.00.00.01.0NANANA1.0NANANA
us-gaap:StockIssuedDuringPeriodValueNewIssues █▁6.01.0NANANANANANANA1.00.01.00.01.0NANANANA0.00.00.01.0NANANANA
us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue ▁▁▁▁▁▁▁▁▁▁▁▁▁▂▁▁▂▂▂█▁▁11.09.011.03.06.05.05.08.010.05.07.06.07.012.010.09.016.015.018.0127.05.03.0NANANANA
us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders NANA0.00.00.046.0NANANANANANANANANANANANANANANANANANANANA
 us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders us-gaap:StatementEquityComponents us-gaap:NoncontrollingInterest▁▁▁▁▁█0.00.00.00.00.046.0NANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities ▄▅█▁▃▃▃▃▃▄▅▃▂▃▅▂▃▃▂▂▂▃872.01626.03229.0-477.0631.0771.0671.0402.0574.01009.01639.0716.0-54.0573.01828.0269.0644.0429.0235.0260.0316.0388.0NANANANA
us-gaap:NetCashProvidedByUsedInInvestingActivities ▄▂▁▆▄█▅▅▇▅▆▆▇▅▇▆▇▇▇▆██-4389.0-6883.0-7718.0-2363.0-4358.0-378.0-2697.0-3241.0-1242.0-2776.0-2027.0-2242.0-1020.0-2884.0-1315.0-1862.0-1500.0-1140.0-920.0-1649.0-148.0115.0NANANANA
us-gaap:NetCashProvidedByUsedInFinancingActivities █▆▇▇█▃▅▄▄▄▁▄▄▂▃▄▄▃▂▂▂▁5270.03788.04155.04100.05264.0970.02633.01635.02387.01882.0-150.01681.02037.0139.0769.01710.01756.0813.0588.0641.0422.0-496.0NANANANA
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect █▁▃▇█▇▆▂█▄1753.0-1469.0-332.01253.01538.01341.0607.0-1204.01719.0115.0NANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet ▂▂▁▅▂█▃▄▃▁-146.0-120.0-209.057.0-171.0258.0-69.0-26.0-50.0-220.0NANANANANANANANANANANANANANANANA
us-gaap:NetCashProvidedByUsedInOperatingActivities ▄▅█▁▃▃▃▃▃▄▅▃▂▃▅▂▃▃▂▂▂▃872.01626.03229.0-477.0631.0771.0671.0402.0574.01009.01639.0716.0-54.0573.01828.0269.0644.0429.0235.0260.0316.0388.0NANANANA
us-gaap:NetIncomeLoss █▆▇▆▆▁▅▅▆▆▄▆▅▅▅▅▅▅▅▄▅▄▅▄▄▄1417.0614.01093.0652.0843.0-1047.0451.0293.0720.0708.0-104.0640.0264.0268.0464.0274.0326.0373.0368.0158.0192.087.0242.072.0104.0144.0
us-gaap:ProfitLoss █▄▇▆▆▁▅▄▅▅▄▅▄▄▅▄▅▅▅▄▄▄▄▄▄▄1806.077.01322.0884.0931.0-1216.0464.0293.0720.0708.0-104.0640.0264.0268.0464.0274.0326.0373.0368.0158.0192.087.0242.072.0104.0160.0
 us-gaap:ShareBasedCompensation us-gaap:ConsolidationItems us-gaap:MaterialReconcilingItems1.0NA0.01.00.010.03.03.03.03.03.03.02.03.03.07.013.013.020.046.028.0-15.0NANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
us-gaap:NetCashProvidedByUsedInInvestingActivities ▄▂▁▆▄█▅▅▇▅▆▆▇▅▇▆▇▇▇▆██-4389.0-6883.0-7718.0-2363.0-4358.0-378.0-2697.0-3241.0-1242.0-2776.0-2027.0-2242.0-1020.0-2884.0-1315.0-1862.0-1500.0-1140.0-920.0-1649.0-148.0115.0NANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
us-gaap:NetCashProvidedByUsedInFinancingActivities █▆▇▇█▃▅▄▄▄▁▄▄▂▃▄▄▃▂▂▂▁5270.03788.04155.04100.05264.0970.02633.01635.02387.01882.0-150.01681.02037.0139.0769.01710.01756.0813.0588.0641.0422.0-496.0NANANANA
us-gaap:ProceedsFromIssuanceOfLongTermDebt NANA493.00.0NANA0.00.00.00.00.00.00.0998.00.00.00.00.0NANANANANANANANA
us-gaap:PaymentsForRepurchaseOfCommonStock ▁▁▁▃▁▇▆▃█▂0.04.03.097.00.0328.0284.0121.0376.051.0NANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31

Common Stock Shares Issued

us-gaap:CommonStockSharesIssued us-gaap:StatementClassOfStock

us-gaap:CommonStockSharesIssued

ahl:CommonClassM1


Common
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value0.00.00.00.03.33.388893.388893.4315473.4742055.198273
Percentage of CommonStockSharesIssued0.00.00.00.0100.0100.0100.0100.0100.0100.0

ahl:CommonClassM2


Common
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value0.00.00.00.00.80.8679230.8679230.9745631.0677473.125869
Percentage of CommonStockSharesIssued0.00.00.00.024.225.625.628.430.760.1

ahl:CommonClassM3


Common
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value0.00.00.00.01.01.2531.2671.346651.34633.11
Percentage of CommonStockSharesIssued0.00.00.00.030.337.037.439.238.859.8

ahl:CommonClassM4


Common
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value0.00.00.00.04.04.7932124.9417055.3454325.3978025.038443
Percentage of CommonStockSharesIssued0.00.00.00.0121.2141.4145.8155.8155.496.9

us-gaap:CommonClassA


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value1911911911911941941431201191017750
Percentage of CommonStockSharesIssued0.00.00.00.00.00.04339.43544.23526.52959.72225.5964.8

us-gaap:CommonClassB


Common
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value0.00.00.00.025697087111135
Percentage of CommonStockSharesIssued0.00.00.00.0769.72052.12068.32557.93218.22615.6

Preferred Stock Shares Issued

us-gaap:PreferredStockSharesIssued us-gaap:StatementClassOfStock

us-gaap:PreferredStockSharesIssued

us-gaap:SeriesAPreferredStock


Preferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-102018-12-31
Value0000000034500.00
Percentage of PreferredStockSharesIssued0.00.00.00.00.00.00.00.0100.00.0

us-gaap:SeriesBPreferredStock


Preferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-09-192018-12-31
Value000013800.000013800.00
Percentage of PreferredStockSharesIssued0.00.00.00.00.00.00.00.00.00.0

Common Stock Shares Authorized

us-gaap:CommonStockSharesAuthorized us-gaap:StatementClassOfStock

us-gaap:CommonStockSharesAuthorized

ahl:CommonClassM1


Common
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value0.00.00.00.07.17.109567.109567.109567.109567.10956
Percentage of CommonStockSharesAuthorized0.00.00.00.0100.0100.0100.0100.0100.0100.0

ahl:CommonClassM2


Common
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value0.00.00.00.05.05.05.05.05.05.0
Percentage of CommonStockSharesAuthorized0.00.00.00.070.470.370.370.370.370.3

ahl:CommonClassM3


Common
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value0.00.00.00.07.57.57.57.57.57.5
Percentage of CommonStockSharesAuthorized0.00.00.00.0105.6105.5105.5105.5105.5105.5

ahl:CommonClassM4


Common
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value0.00.00.00.07.57.57.57.57.57.5
Percentage of CommonStockSharesAuthorized0.00.00.00.0105.6105.5105.5105.5105.5105.5

us-gaap:CommonClassB


Common
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value0.00.00.00.0325325325325325325
Percentage of CommonStockSharesAuthorized0.00.00.00.04577.54571.34571.34571.34571.34571.3

Preferred Stock Shares Authorized

us-gaap:PreferredStockSharesAuthorized us-gaap:StatementClassOfStock

us-gaap:PreferredStockSharesAuthorized

us-gaap:SeriesAPreferredStock


Preferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-31
Value000034500.034500.034500.000
Percentage of PreferredStockSharesAuthorized0.00.00.00.0100.0100.0100.00.00.0

us-gaap:SeriesBPreferredStock


Preferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-31
Value000013800.013800.013800.000
Percentage of PreferredStockSharesAuthorized0.00.00.00.040.040.040.00.00.0

us-gaap:SeriesCPreferredStock


Preferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value000024000.00
Percentage of PreferredStockSharesAuthorized0.00.00.00.069.60.0

Common Stock Shares Outstanding

us-gaap:CommonStockSharesOutstanding us-gaap:StatementClassOfStock

us-gaap:CommonStockSharesOutstanding

ahl:CommonClassM1


Common
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312018-12-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312014-12-312013-12-31
Value0.00.00.00.03.33.43.388893.388893.388893.4315473.4742055.1982735.1982735.198273
Percentage of CommonStockSharesOutstanding0.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ahl:CommonClassM2


Common
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312018-12-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312014-12-312013-12-31
Value0.00.00.00.00.80.80.8511030.8679230.8679230.9745631.0677473.1258693.1258693.226792
Percentage of CommonStockSharesOutstanding0.00.00.00.024.223.525.125.625.628.430.760.160.162.1

ahl:CommonClassM3


Common
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312018-12-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312014-12-312013-12-31
Value0.00.00.00.01.01.01.0921.2531.2671.346651.34633.113.350.0
Percentage of CommonStockSharesOutstanding0.00.00.00.030.329.432.237.037.439.238.859.864.40.0

ahl:CommonClassM4


Common
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312018-12-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312014-12-312013-12-31
Value0.00.00.00.04.04.14.7117434.7932124.9417055.3454325.3978025.0384430.00.0
Percentage of CommonStockSharesOutstanding0.00.00.00.0121.2120.6139.0141.4145.8155.8155.496.90.00.0

us-gaap:CommonClassA


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312014-12-312013-12-31
Value1911911911911941941431621421201191017750150.4942
Percentage of CommonStockSharesOutstanding0.00.00.00.00.00.04339.44776.54201.63544.23526.52959.72225.5964.8303.09.5

us-gaap:CommonClassB


Common
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312018-12-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312014-12-312013-12-31
Value0.00.00.00.0252547697087111135125114
Percentage of CommonStockSharesOutstanding0.00.00.00.0769.7747.11399.32052.12068.32557.93218.22615.62410.12204.7

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding us-gaap:StatementClassOfStock

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:CommonClassA


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-31
Value19819619719616115215816116516414811910981495050
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic us-gaap:StatementClassOfStock

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:CommonClassA


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-31
Value19119119319316115115816116416414811910678495050
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount us-gaap:StatementClassOfStock

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:CommonClassA


Antidilutive
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-31
Value0.61.02.83.311323134343535797491135136135
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic us-gaap:StatementClassOfStock

us-gaap:EarningsPerShareBasic

ahl:CommonClassM1


Earnings
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value000-3.872.431.53.763.65-0.533.241.341.362.361.41.661.941.94
Percentage of EarningsPerShareBasic0.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ahl:CommonClassM2


Earnings
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value000-3.872.431.53.763.65-0.533.241.341.362.361.41.661.94
Percentage of EarningsPerShareBasic0.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ahl:CommonClassM3


Earnings
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value000-3.872.431.53.763.65-0.533.241.341.362.361.41.66
Percentage of EarningsPerShareBasic0.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ahl:CommonClassM4


Earnings
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value000-3.872.431.53.763.65-0.533.241.341.362.361.41.66
Percentage of EarningsPerShareBasic0.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommonClassA


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value7.213.025.573.224.25-5.812.431.53.763.65-0.533.241.341.362.361.41.661.941.940.851.030.471.30.390.561.01
Percentage of EarningsPerShareBasic0.00.00.00.00.0150.1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.0

us-gaap:CommonClassB


Earnings
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value000-3.872.431.53.763.65-0.533.241.341.362.361.41.661.941.940.851.030.471.30.390.561.01
Percentage of EarningsPerShareBasic0.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted us-gaap:StatementClassOfStock

us-gaap:EarningsPerShareDiluted

ahl:CommonClassM1


Earnings
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value000-3.872.431.53.763.65-0.533.241.341.362.361.41.661.940.46
Percentage of EarningsPerShareDiluted0.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ahl:CommonClassM2


Earnings
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value000-3.872.431.53.763.65-0.533.241.331.342.341.391.640.08
Percentage of EarningsPerShareDiluted0.00.00.0100.0100.0100.0100.0100.0100.0100.099.398.599.299.398.84.1

ahl:CommonClassM3


Earnings
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value000-3.872.431.53.763.65-0.533.241.341.332.11.071.0
Percentage of EarningsPerShareDiluted0.00.00.0100.0100.0100.0100.0100.0100.0100.0100.097.889.076.460.2

ahl:CommonClassM4


Earnings
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value000-3.872.131.293.283.15-0.532.491.040.941.490.790.76
Percentage of EarningsPerShareDiluted0.00.00.0100.087.786.087.286.3100.076.977.669.163.156.445.8

us-gaap:CommonClassA


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value6.972.945.443.164.19-5.812.421.53.753.64-0.533.231.331.362.351.391.651.871.80.851.030.471.30.390.561.01
Percentage of EarningsPerShareDiluted0.00.00.00.00.0150.199.6100.099.799.7100.099.799.3100.099.699.399.496.4391.30.00.00.00.00.00.00.0

us-gaap:CommonClassB


Earnings
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value000-3.872.431.53.763.65-0.533.241.341.362.361.41.661.941.940.851.030.471.30.390.561.01
Percentage of EarningsPerShareDiluted0.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0421.70.00.00.00.00.00.00.0

Benefits Losses And Expenses

us-gaap:BenefitsLossesAndExpenses

us-gaap:BenefitsLossesAndExpenses


Benefits
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value44334252715722513317-167.0272342222619422113011882146768433741179142612246761205839634825149413637
Percentage of BenefitsLossesAndExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues69.096.882.868.775.410.883.693.877.785.1112.772.781.667.787.180.080.975.663.794.480.187.878.966.575.979.3

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value2733-1336.0217613564201-4496.032497517741886530376713679-152.0477814272
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues42.6-30.425.241.495.5290.310.021.752.738.013.725.540.441.9-14.337.477.737.7

Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-06-302019-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value513-713.0309246338-352.00.00.00.00.00.00.00.00.00.00.0
Percentage of ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.0
Percentage of Revenues8.0-16.23.67.57.722.70.00.00.00.00.00.00.00.00.00.0

Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value3246-2049.0248516024539-4848.032097517741886-668.0557-195.0-520.0530376713679-152.0477814272
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues50.5-46.728.848.9103.2313.09.821.752.738.0-57.921.5-10.9-51.413.725.540.441.9-14.337.477.737.7

Gain Loss On Investments

us-gaap:GainLossOnInvestments

us-gaap:GainLossOnInvestments


Gain
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value2610-488.0253617972548-3572.096566513131776
Percentage of GainLossOnInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues40.6-11.129.454.957.9230.629.614.839.035.8

us-gaap:GainLossOnInvestments us-gaap:ConsolidatedEntities

us-gaap:VariableInterestEntityPrimaryBeneficiary


Gain
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value18-66.02.026-7.01.0-5.02.03.05.0
Percentage of GainLossOnInvestments0.713.50.11.4-0.3-0.0-0.50.30.20.3
Percentage of Revenues0.3-1.50.00.8-0.2-0.1-0.20.00.10.1
Percentage of Revenues us-gaap:VariableInterestEntityPrimaryBeneficiary0.00.00.00.00.00.00.00.00.00.0

us-gaap:GainLossOnInvestments us-gaap:ConsolidationItems

us-gaap:MaterialReconcilingItems


Gain
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value685-857.06914681246-1685.0-83.0373682713-178.0-82.0-149.0-106.013563138
Percentage of GainLossOnInvestments26.2175.627.226.048.947.2-8.656.151.940.10.00.00.00.00.00.00.0
Percentage of Revenues10.7-19.58.014.328.3108.8-2.58.320.214.4-15.4-3.2-8.3-10.53.54.37.8
Percentage of Revenues us-gaap:MaterialReconcilingItems0.00.00.00.00.00.00.00.00.00.00.00.00.038.80.014.234.0

us-gaap:GainLossOnInvestments us-gaap:RelatedPartyTransactionsByRelatedParty

srt:AffiliatedEntity


Gain
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value280-139.0273299761-631.0-16.0273431321
Percentage of GainLossOnInvestments10.728.510.816.629.917.7-1.741.132.818.1
Percentage of Revenues4.4-3.23.29.117.340.7-0.56.112.86.5
Percentage of Revenues srt:AffiliatedEntity0.00.00.00.00.00.00.00.00.00.0

Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value1990139148310241081-1382.0533279750740-188.07063303274982943373954223820888
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues31.03.217.231.324.689.216.46.222.314.9-16.327.318.432.312.920.019.124.439.73.019.912.2

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxExpenseBenefit


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value18462161140150-166.069-14.03032-69.06666593420112221-88.0151.0
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues2.91.41.94.33.410.72.1-0.30.90.6-6.02.63.75.80.91.40.61.42.0-6.91.40.1

us-gaap:IncomeTaxExpenseBenefit us-gaap:ConsolidationItems

us-gaap:MaterialReconcilingItems


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value558.0559727-131.019-21.0-4.06.0-83.06817201.07.03.014110.0-4.0-9.0
Percentage of IncomeTaxExpenseBenefit29.912.934.269.318.078.927.5150.0-13.318.8120.3103.025.833.92.935.027.363.652.4-0.0-26.7-900.0
Percentage of Revenues0.90.20.63.00.68.50.6-0.5-0.10.1-7.22.60.92.00.00.50.20.91.00.0-0.4-1.2
Percentage of Revenues us-gaap:MaterialReconcilingItems0.00.00.00.00.00.00.00.00.00.00.00.00.0-7.30.01.60.72.10.00.0-2.29.5

Insurance Commissions And Fees

us-gaap:InsuranceCommissionsAndFees

us-gaap:InsuranceCommissionsAndFees


Insurance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value157150146144141140132135132125
Percentage of InsuranceCommissionsAndFees100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues2.43.41.74.43.2-9.04.13.03.92.5

us-gaap:InsuranceCommissionsAndFees us-gaap:RelatedPartyTransactionsByRelatedParty

srt:AffiliatedEntity


Insurance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value121110.013121612141414
Percentage of InsuranceCommissionsAndFees7.67.36.89.08.511.49.110.410.611.2
Percentage of Revenues0.20.30.10.40.3-1.00.40.30.40.3
Percentage of Revenues srt:AffiliatedEntity0.00.00.00.00.00.00.00.00.00.0

Interest Expense Long Term Debt

us-gaap:InterestExpenseLongTermDebt

us-gaap:InterestExpenseLongTermDebt


Interest
Period End2021-06-302020-06-302018-12-312018-09-302018-06-30
Value25181110.011
Percentage of InterestExpenseLongTermDebt100.0100.0100.0100.0100.0
Percentage of Revenues0.40.41.00.40.6

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value14176141093652843-1047.0451293720708-104.06402642684642743263733681581928724272104144
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues22.114.012.719.919.267.613.96.521.414.3-9.024.714.726.512.018.618.523.034.712.418.312.023.232.119.117.9

Net Income Loss Attributable To Noncontrolling Interest

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value389-537.022923288-169.0130.00.00.00.00.00.00.00.00.00.00.0
Percentage of NetIncomeLossAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Revenues6.1-12.22.77.12.010.90.40.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss Available To Common Stockholders Basic

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value13825781065622824-1065.0432276720708-104.0623257277
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues21.513.212.319.018.768.813.36.121.414.3-9.024.114.327.4

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, ahl:RetirementServices


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value634784493361208204404256376286296379
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic45.9135.646.358.025.2-19.293.592.852.240.4-284.660.8
Percentage of Revenues9.917.95.711.04.7-13.212.45.711.25.825.614.6
Percentage of Revenues us-gaap:OperatingSegments ahl:RetirementServices23.621.60.021.113.18.30.06.216.78.70.021.3

us-gaap:OperatingSegments, us-gaap:CorporateAndOther


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value366-36.065-59.0282-312.0-15.0-13.0-6.01.0-56.0-8.0
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic26.5-6.26.1-9.534.229.3-3.5-4.7-0.80.153.8-1.3
Percentage of Revenues5.7-0.80.8-1.86.420.1-0.5-0.3-0.20.0-4.9-0.3
Percentage of Revenues us-gaap:OperatingSegments us-gaap:CorporateAndOther67.9-94.70.0393.363.294.50.0-46.4-25.03.10.0-44.4

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic us-gaap:StatementClassOfStock

ahl:CommonClassM1


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0.00.00.0-13.08.05.01312-2.0115.05.08.05.06.07.0
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic0.00.00.01.21.91.81.81.71.91.81.91.80.00.00.00.0
Percentage of Revenues0.00.00.00.80.20.10.40.2-0.20.40.30.50.20.30.30.4
Percentage of Revenues ahl:CommonClassM10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

ahl:CommonClassM2


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0.00.00.0-3.03.01.03.03.00.03.01.01.02.01.02.00.0
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic0.00.00.00.30.70.40.40.4-0.00.50.40.40.00.00.00.0
Percentage of Revenues0.00.00.00.20.10.00.10.10.00.10.10.10.10.10.10.0
Percentage of Revenues ahl:CommonClassM20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

ahl:CommonClassM3


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0.00.00.0-4.02.02.04.03.0-1.03.01.01.02.01.01.00.0
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic0.00.00.00.40.50.70.60.41.00.50.40.40.00.00.00.0
Percentage of Revenues0.00.00.00.30.10.00.10.1-0.10.10.10.10.10.10.10.0
Percentage of Revenues ahl:CommonClassM30.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

ahl:CommonClassM4


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0.00.00.0-9.07.03.08.08.0-2.06.03.03.05.02.02.00.0
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic0.00.00.00.81.61.11.11.11.91.01.21.10.00.00.00.0
Percentage of Revenues0.00.00.00.60.20.10.20.2-0.20.20.20.30.10.10.10.0
Percentage of Revenues ahl:CommonClassM40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonClassA


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value13825781065622824-938.0349227596589-89.05342202022851671771561063452
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic100.0100.0100.0100.0100.088.180.882.282.883.285.685.785.672.90.00.00.00.00.00.00.0
Percentage of Revenues21.513.212.319.018.760.610.75.017.711.9-7.720.612.220.07.411.310.09.610.02.75.0
Percentage of Revenues us-gaap:CommonClassA0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonClassB


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value0.00.00.0-98.063389693-25.08334561629813822125792141
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic0.00.00.09.214.613.813.313.124.013.313.220.20.00.00.00.00.00.00.0
Percentage of Revenues0.00.00.06.31.90.82.81.9-2.23.21.95.54.26.77.813.724.27.213.5
Percentage of Revenues us-gaap:CommonClassB0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss Available To Common Stockholders Diluted

us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted us-gaap:StatementClassOfStock

us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted

ahl:CommonClassM1


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0.00.00.0-13.08.05.01312-2.0115.05.08.05.06.07.0
Percentage of NetIncomeLossAvailableToCommonStockholdersDiluted0.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.00.00.00.80.20.10.40.2-0.20.40.30.50.20.30.30.4
Percentage of Revenues ahl:CommonClassM10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

ahl:CommonClassM2


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0.00.00.0-3.03.01.03.03.0-1.03.01.01.02.01.02.00.0
Percentage of NetIncomeLossAvailableToCommonStockholdersDiluted0.00.00.023.137.520.023.125.050.027.320.020.025.020.033.30.0
Percentage of Revenues0.00.00.00.20.10.00.10.1-0.10.10.10.10.10.10.10.0
Percentage of Revenues ahl:CommonClassM20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

ahl:CommonClassM3


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value0.00.00.0-4.02.02.04.03.0-1.03.01.01.02.01.01.0
Percentage of NetIncomeLossAvailableToCommonStockholdersDiluted0.00.00.030.825.040.030.825.050.027.320.020.025.020.016.7
Percentage of Revenues0.00.00.00.30.10.00.10.1-0.10.10.10.10.10.10.1
Percentage of Revenues ahl:CommonClassM30.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

ahl:CommonClassM4


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value0.00.00.0-9.07.03.08.08.0-2.07.03.03.05.02.02.0
Percentage of NetIncomeLossAvailableToCommonStockholdersDiluted0.00.00.069.287.560.061.566.7100.063.660.060.062.540.033.3
Percentage of Revenues0.00.00.00.60.20.10.20.2-0.20.30.20.30.10.10.1
Percentage of Revenues ahl:CommonClassM40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonClassA


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value13825781065622824-938.0349227596589-89.05342202022941671811561063452
Percentage of NetIncomeLossAvailableToCommonStockholdersDiluted0.00.00.00.00.07215.44362.54540.04584.64908.34450.04854.54400.04040.03675.03340.03016.72228.60.00.00.0
Percentage of Revenues21.513.212.319.018.760.610.75.017.711.9-7.720.612.220.07.611.310.39.610.02.75.0
Percentage of Revenues us-gaap:CommonClassA0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonClassB


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value0.00.00.0-98.063389693-25.08334561629813822125792141
Percentage of NetIncomeLossAvailableToCommonStockholdersDiluted0.00.00.0753.8787.5760.0738.5775.01250.0754.5680.01120.02025.01960.02300.03157.10.00.00.0
Percentage of Revenues0.00.00.06.31.90.82.81.9-2.23.21.95.54.26.77.813.724.27.213.5
Percentage of Revenues us-gaap:CommonClassB0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Investment Income

us-gaap:NetInvestmentIncome

us-gaap:NetInvestmentIncome


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value203817041595120913367451168109011821082
Percentage of NetInvestmentIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues31.738.818.536.930.4-48.135.924.235.121.8

us-gaap:NetInvestmentIncome us-gaap:ConsolidatedEntities

srt:ConsolidatedEntityExcludingVariableInterestEntitiesVIE


Net
Period End2020-09-302020-06-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value12091336122510701161106611211070958855842820821
Percentage of NetInvestmentIncome100.0100.0104.998.298.298.50.00.00.00.00.00.00.0
Percentage of Revenues36.930.437.623.834.521.597.141.353.384.621.755.746.6
Percentage of Revenues srt:ConsolidatedEntityExcludingVariableInterestEntitiesVIE0.00.00.00.00.00.00.041.553.20.00.00.00.0

us-gaap:VariableInterestEntityPrimaryBeneficiary


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value21351718160.017202116
Percentage of NetInvestmentIncome1.02.11.11.51.20.01.51.81.81.5
Percentage of Revenues0.30.80.20.50.4-0.00.50.40.60.3
Percentage of Revenues us-gaap:VariableInterestEntityPrimaryBeneficiary0.00.00.00.00.00.00.00.00.00.0

us-gaap:NetInvestmentIncome us-gaap:RelatedPartyTransactionsByRelatedParty

srt:AffiliatedEntity


Net
Period End2021-06-302021-03-312020-06-302020-03-31
Value860596490-214.0
Percentage of NetInvestmentIncome42.235.036.7-28.7
Percentage of Revenues13.413.611.113.8
Percentage of Revenues srt:AffiliatedEntity0.00.00.00.0

Other Comprehensive Income Loss Net Of Tax

us-gaap:OtherComprehensiveIncomeLossNetOfTax

us-gaap:OtherComprehensiveIncomeLossNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value1440-2126.011637183608-3632.0-144.068210541178-549.0-83.0-459.0-788.066102387306-553.0351621185
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues22.4-48.413.521.982.0234.5-4.415.231.323.7-47.6-3.2-25.5-77.91.76.922.018.9-52.127.559.325.6

us-gaap:OtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value1316-1950.010837043358-3449.0-127.068210541178-549.0-114.0-487.0-788.066102387306-553.0351621185
Percentage of OtherComprehensiveIncomeLossNetOfTax91.491.793.198.193.195.088.2100.0100.0100.0100.0137.3106.1100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues20.5-44.412.521.576.4222.7-3.915.231.323.7-47.6-4.4-27.1-77.91.76.922.018.9-52.127.559.325.6
Percentage of Revenues us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NoncontrollingInterest


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-06-30
Value124-176.08014250-183.00.0
Percentage of OtherComprehensiveIncomeLossNetOfTax8.68.36.91.96.95.00.0
Percentage of Revenues1.9-4.00.90.45.711.80.0
Percentage of Revenues us-gaap:NoncontrollingInterest0.00.00.00.00.00.00.0

us-gaap:Parent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value1316-1950.010837043358-3449.0-127.068210541178-549.0-83.0-459.0-788.066102387306-553.0351621185
Percentage of OtherComprehensiveIncomeLossNetOfTax91.491.793.198.193.195.088.2100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues20.5-44.412.521.576.4222.7-3.915.231.323.7-47.6-3.2-25.5-77.91.76.922.018.9-52.127.559.325.6
Percentage of Revenues us-gaap:Parent0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Other Income

us-gaap:OtherIncome

us-gaap:OtherIncome


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value20147.01318-2.010.06.09.012
Percentage of OtherIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.30.30.10.40.40.10.30.10.30.2

us-gaap:OtherIncome us-gaap:RelatedPartyTransactionsByRelatedParty

srt:AffiliatedEntity


Other
Period End2021-06-302020-06-30
Value150.0
Percentage of OtherIncome75.00.0
Percentage of Revenues0.20.0
Percentage of Revenues srt:AffiliatedEntity0.00.0

Policyholder Benefits And Claims Incurred Net

us-gaap:PolicyholderBenefitsAndClaimsIncurredNet

us-gaap:PolicyholderBenefitsAndClaimsIncurredNet


Policyholder
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value19503317471843967413561192295511112329
Percentage of PolicyholderBenefitsAndClaimsIncurredNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues30.475.554.613.415.3-87.536.665.733.046.9

us-gaap:PolicyholderBenefitsAndClaimsIncurredNet us-gaap:RelatedPartyTransactionsByRelatedParty

srt:AffiliatedEntity


Policyholder
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1118910710614250987091106
Percentage of PolicyholderBenefitsAndClaimsIncurredNet5.72.72.324.121.13.78.22.48.24.6
Percentage of Revenues1.72.01.23.23.2-3.23.01.62.72.1
Percentage of Revenues srt:AffiliatedEntity0.00.00.00.00.00.00.00.00.00.0

Preferred Stock Dividends Income Statement Impact

us-gaap:PreferredStockDividendsIncomeStatementImpact

us-gaap:PreferredStockDividendsIncomeStatementImpact


Preferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value35362830191819170.00.00.00.0
Percentage of PreferredStockDividendsIncomeStatementImpact100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.0
Percentage of Revenues0.50.80.30.90.4-1.20.60.40.00.00.00.0

Premiums Earned Net

us-gaap:PremiumsEarnedNet

us-gaap:PremiumsEarnedNet


Premiums
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value159830114356112355114090726887872000
Percentage of PremiumsEarnedNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues24.968.650.43.48.1-73.627.959.723.440.3

us-gaap:PremiumsEarnedNet us-gaap:RelatedPartyTransactionsByRelatedParty

srt:AffiliatedEntity


Premiums
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value78798871946970515666
Percentage of PremiumsEarnedNet4.92.62.063.426.56.17.71.97.13.3
Percentage of Revenues1.21.81.02.22.1-4.52.11.11.71.3
Percentage of Revenues srt:AffiliatedEntity0.00.00.00.00.00.00.00.00.00.0

Profit Loss

us-gaap:ProfitLoss

us-gaap:ProfitLoss


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value1806771322884931-1216.0464293720708-104.06402642684642743263733681581928724272104160
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues28.11.815.327.021.278.514.36.521.414.3-9.024.714.726.512.018.618.523.034.712.418.312.023.232.119.119.9

us-gaap:ProfitLoss us-gaap:CounterpartyName, us-gaap:EquityMethodInvestmentNonconsolidatedInvestee, us-gaap:RelatedPartyTransactionsByRelatedParty

ahl:AAMortgageOpportunitiesLP, us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther, srt:AffiliatedEntity


Profit
Period End2021-03-312020-03-31
Value26139
Percentage of ProfitLoss339.0-3.2
Percentage of Revenues5.9-2.5
Percentage of Revenues ahl:AAMortgageOpportunitiesLP us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther srt:AffiliatedEntity0.00.0

ahl:VenerableHoldingsInc., us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther, srt:AffiliatedEntity


Profit
Period End2021-03-312020-03-31
Value91348
Percentage of ProfitLoss1185.7-3.9
Percentage of Revenues20.8-3.1
Percentage of Revenues ahl:VenerableHoldingsInc. us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther srt:AffiliatedEntity0.00.0

us-gaap:ProfitLoss us-gaap:EquityMethodInvestmentNonconsolidatedInvestee

us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther


Profit
Period End2020-12-312019-12-31
Value1862729
Percentage of ProfitLoss140.8157.1
Percentage of Revenues21.622.4
Percentage of Revenues us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther0.00.0

us-gaap:ProfitLoss us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value389-537.022923288-169.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of ProfitLoss21.5-697.417.326.29.513.90.00.0-0.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Revenues6.1-12.22.77.12.010.90.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Revenues us-gaap:NoncontrollingInterest0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Parent


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value14176141093652843-1047.0451293720708-119.064026426846427433737340112619187
Percentage of ProfitLoss78.5797.482.773.890.586.197.2100.0100.0100.0114.4100.0100.0100.0100.0100.0103.4100.0109.079.799.5100.0
Percentage of Revenues22.114.012.719.919.267.613.96.521.414.3-10.324.714.726.512.018.619.123.037.89.918.212.0
Percentage of Revenues us-gaap:Parent0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value14176141093652843-1047.0451293720708-119.062325726846427433737340112619187
Percentage of ProfitLoss78.5797.482.773.890.586.197.2100.0100.0100.0114.497.397.3100.0100.0100.0103.4100.0109.079.799.5100.0
Percentage of Revenues22.114.012.719.919.267.613.96.521.414.3-10.324.114.326.512.018.619.123.037.89.918.212.0
Percentage of Revenues us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Revenues

us-gaap:Revenues

us-gaap:Revenues


Revenues
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value64234391864032754398-1549.03256450133694961115425881797101138721473176316191062127610477221045224544803
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Revenues us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, ahl:RetirementServices


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value2690363749121711158924691810409622483306321717761868125728829361254888868876800786
Percentage of Revenues41.982.856.952.236.1-159.455.691.066.766.6278.868.6104.0124.374.463.571.154.881.768.776.4108.9
Percentage of Revenues41.982.856.952.236.1-159.455.691.066.766.6278.868.6104.0124.374.463.571.154.881.768.776.4108.9
Percentage of Revenues us-gaap:OperatingSegments ahl:RetirementServices100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, us-gaap:CorporateAndOther


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value53938165-15.0446-330.033282432-27.01826271039410368102696631
Percentage of Revenues8.40.91.9-0.510.121.31.00.60.70.6-2.30.71.42.72.76.45.84.29.65.46.34.3
Percentage of Revenues8.40.91.9-0.510.121.31.00.60.70.6-2.30.71.42.72.76.45.84.29.65.46.34.3
Percentage of Revenues us-gaap:OperatingSegments us-gaap:CorporateAndOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Assets

us-gaap:Assets

us-gaap:Assets


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312014-12-31
Value2155492056702027711910881832411421791468751442021389801328571255051182041147559355799747960619359489220867208085482710
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Assets us-gaap:ConsolidatedEntities

srt:ParentCompany


Assetsus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-31
Value206931447094159315
Percentage of Assets10.29.97.59.3
Percentage of Assets10.29.97.59.3
Percentage of Assets srt:ParentCompany100.0100.0100.0100.0

us-gaap:VariableInterestEntityNotPrimaryBeneficiary


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312019-12-31
Value44016406973731831622
Percentage of Assets20.419.818.421.5
Percentage of Assets20.419.818.421.5
Percentage of Assets us-gaap:VariableInterestEntityNotPrimaryBeneficiary100.0100.0100.0100.0

us-gaap:Assets us-gaap:ConsolidatedEntities, us-gaap:BalanceSheetLocation, us-gaap:FairValueByAssetClass

us-gaap:VariableInterestEntityNotPrimaryBeneficiary, ahl:InvestmentsExcludingInvestmentsInRelatedParty, ahl:InvestmentFunds


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312019-12-31
Value1159966803750
Percentage of Assets0.50.50.40.5
Percentage of Assets0.50.50.40.5
Percentage of Assets us-gaap:VariableInterestEntityNotPrimaryBeneficiary ahl:InvestmentsExcludingInvestmentsInRelatedParty ahl:InvestmentFunds100.0100.0100.0100.0

us-gaap:Assets us-gaap:ConsolidatedEntities, us-gaap:BalanceSheetLocation, us-gaap:InvestmentType

us-gaap:VariableInterestEntityNotPrimaryBeneficiary, ahl:InvestmentsExcludingInvestmentsInRelatedParty, us-gaap:DebtSecurities


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312019-12-31
Value27808253242332522694
Percentage of Assets12.912.311.515.5
Percentage of Assets12.912.311.515.5
Percentage of Assets us-gaap:VariableInterestEntityNotPrimaryBeneficiary ahl:InvestmentsExcludingInvestmentsInRelatedParty us-gaap:DebtSecurities100.0100.0100.0100.0

us-gaap:Assets us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass, us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:VariableInterestEntityNotPrimaryBeneficiary, ahl:InvestmentFunds, srt:AffiliatedEntity


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312019-12-31
Value6324589952843550
Percentage of Assets2.92.92.62.4
Percentage of Assets2.92.92.62.4
Percentage of Assets us-gaap:VariableInterestEntityNotPrimaryBeneficiary ahl:InvestmentFunds srt:AffiliatedEntity100.0100.0100.0100.0

us-gaap:Assets us-gaap:ConsolidatedEntities, us-gaap:InvestmentType, us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:VariableInterestEntityNotPrimaryBeneficiary, us-gaap:DebtSecurities, srt:AffiliatedEntity


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312019-12-31
Value8610839478344570
Percentage of Assets4.04.13.93.1
Percentage of Assets4.04.13.93.1
Percentage of Assets us-gaap:VariableInterestEntityNotPrimaryBeneficiary us-gaap:DebtSecurities srt:AffiliatedEntity100.0100.0100.0100.0

us-gaap:VariableInterestEntityNotPrimaryBeneficiary, us-gaap:EquitySecurities, srt:AffiliatedEntity


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312019-12-31
Value1151147258
Percentage of Assets0.10.10.00.0
Percentage of Assets0.10.10.00.0
Percentage of Assets us-gaap:VariableInterestEntityNotPrimaryBeneficiary us-gaap:EquitySecurities srt:AffiliatedEntity100.0100.0100.0100.0

us-gaap:Assets us-gaap:EquityMethodInvestmentNonconsolidatedInvestee

us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther


Assetsus-gaap:
Period End2020-12-312019-12-31
Value13080750563
Percentage of Assets64.534.4
Percentage of Assets64.534.4
Percentage of Assets us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther100.0100.0

us-gaap:Assets us-gaap:FairValueByAssetClass, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities

ahl:InvestmentFunds, us-gaap:VariableInterestEntityNotPrimaryBeneficiary


Assetsus-gaap:
Period End2020-09-302020-06-302019-12-31
Value723682750
Percentage of Assets0.40.40.5
Percentage of Assets0.40.40.5
Percentage of Assets ahl:InvestmentFunds us-gaap:VariableInterestEntityNotPrimaryBeneficiary100.0100.0100.0

us-gaap:Assets us-gaap:FairValueByAssetClass, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities, us-gaap:RelatedPartyTransactionsByRelatedParty

ahl:InvestmentFunds, us-gaap:VariableInterestEntityNotPrimaryBeneficiary, srt:AffiliatedEntity


Assetsus-gaap:
Period End2020-09-302020-06-302019-12-31
Value480852783550
Percentage of Assets2.52.92.4
Percentage of Assets2.52.92.4
Percentage of Assets ahl:InvestmentFunds us-gaap:VariableInterestEntityNotPrimaryBeneficiary srt:AffiliatedEntity100.0100.0100.0

us-gaap:Assets us-gaap:InvestmentType, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities

us-gaap:DebtSecurities, us-gaap:VariableInterestEntityNotPrimaryBeneficiary


Assetsus-gaap:
Period End2020-09-302020-06-302019-12-31
Value219302258922694
Percentage of Assets11.512.315.5
Percentage of Assets11.512.315.5
Percentage of Assets us-gaap:DebtSecurities us-gaap:VariableInterestEntityNotPrimaryBeneficiary100.0100.0100.0

us-gaap:Assets us-gaap:InvestmentType, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities, us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:DebtSecurities, us-gaap:VariableInterestEntityNotPrimaryBeneficiary, srt:AffiliatedEntity


Assetsus-gaap:
Period End2020-09-302020-06-302019-12-31
Value621849224570
Percentage of Assets3.32.73.1
Percentage of Assets3.32.73.1
Percentage of Assets us-gaap:DebtSecurities us-gaap:VariableInterestEntityNotPrimaryBeneficiary srt:AffiliatedEntity100.0100.0100.0

us-gaap:EquitySecurities, us-gaap:VariableInterestEntityNotPrimaryBeneficiary, srt:AffiliatedEntity


Assetsus-gaap:
Period End2020-09-302020-06-302019-12-31
Value505258
Percentage of Assets0.00.00.0
Percentage of Assets0.00.00.0
Percentage of Assets us-gaap:EquitySecurities us-gaap:VariableInterestEntityNotPrimaryBeneficiary srt:AffiliatedEntity100.0100.0100.0

us-gaap:Assets us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities

us-gaap:VariableInterestEntityNotPrimaryBeneficiary


Assetsus-gaap:
Period End2020-09-302020-06-302019-12-31
Value337293352331622
Percentage of Assets17.718.321.5
Percentage of Assets17.718.321.5
Percentage of Assets us-gaap:VariableInterestEntityNotPrimaryBeneficiary100.0100.0100.0

us-gaap:Assets us-gaap:StatementBusinessSegments

ahl:RetirementServices


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312014-12-31
Value2090812000931972951864001785551390971438811415011365651309651234981152601115129011591335880348584281827793197371081606
Percentage of Assets97.097.397.397.597.497.898.098.198.398.698.497.597.296.391.691.691.791.791.591.298.7
Percentage of Assets97.097.397.397.597.497.898.098.198.398.698.497.597.296.391.691.691.791.791.591.298.7
Percentage of Assets ahl:RetirementServices100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CorporateAndOther


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312014-12-31
Value646855775476468846863082299427012415189220072944324334428412802777527393740171441104
Percentage of Assets3.02.72.72.52.62.22.01.91.71.41.62.52.83.78.48.48.38.38.58.81.3
Percentage of Assets3.02.72.72.52.62.22.01.91.71.41.62.52.83.78.48.48.38.38.58.81.3
Percentage of Assets us-gaap:CorporateAndOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Assets us-gaap:TransactionType

ahl:ReinsuranceAgreement


Assetsus-gaap:
Period End2020-12-312020-06-012019-12-312018-12-312018-06-01
Value28805288058182625518255
Percentage of Assets14.20.00.620.90.0
Percentage of Assets14.20.00.620.90.0
Percentage of Assets ahl:ReinsuranceAgreement100.0100.0100.0100.0100.0

Liabilities

us-gaap:Liabilities

us-gaap:Liabilities


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value19387818733418263117397116760213164913273413065712661512274011722910913510625084862905398739285310816237981475491
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets89.991.190.191.091.592.690.490.691.192.493.492.392.690.790.891.091.191.592.093.4

us-gaap:Liabilities us-gaap:ConsolidatedEntities

srt:ParentCompany


Liabilitiesus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-31
Value203610791139139
Percentage of Liabilities1.10.81.00.2
Percentage of Assets1.00.70.90.1
Percentage of Assets srt:ParentCompany9.87.512.11.5

us-gaap:Liabilities us-gaap:EquityMethodInvestmentNonconsolidatedInvestee

us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther


Liabilitiesus-gaap:
Period End2020-12-312019-12-31
Value10965431821
Percentage of Liabilities60.024.0
Percentage of Assets54.121.7
Percentage of Assets us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther83.862.9

us-gaap:Liabilities us-gaap:TransactionType

ahl:ReinsuranceAgreement


Liabilitiesus-gaap:
Period End2020-12-312020-06-012019-12-312018-12-312018-06-01
Value27439274397912723819035
Percentage of Liabilities15.00.00.623.20.0
Percentage of Assets13.50.00.521.70.0
Percentage of Assets ahl:ReinsuranceAgreement95.395.396.7103.7104.3

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:LiabilitiesAndStockholdersEquity


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value21554920567020277119108818324114217914687514420213898013285712550511820411475593557997479606193594892208672080854
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilitiesAndStockholdersEquity us-gaap:ConsolidatedEntities

srt:ParentCompany


Liabilities
Period End2020-12-312019-12-312018-12-312017-12-31
Value206931447094159315
Percentage of LiabilitiesAndStockholdersEquity10.29.97.59.3
Percentage of Assets10.29.97.59.3
Percentage of Assets srt:ParentCompany100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value20006172911865715943147119940133918276920886698284759769055362
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets9.38.49.28.38.07.09.16.69.29.08.98.58.06.6

us-gaap:StockholdersEquity us-gaap:ConsolidatedEntities

srt:ParentCompany


Stockholders
Period End2020-12-312019-12-312018-12-312017-12-31
Value186571339182769176
Percentage of StockholdersEquity100.0100.0100.099.7
Percentage of Assets9.29.16.69.2
Percentage of Assets srt:ParentCompany90.292.587.998.5

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashAndCashEquivalentsAtCarryingValue


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-312013-12-31
Value8057642777047548624054194240340548923608348025652459256733132737272026383035
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.73.13.84.03.43.82.92.74.93.83.72.92.80.00.00.03.43.20.0

us-gaap:CashAndCashEquivalentsAtCarryingValue us-gaap:ConsolidatedEntities

srt:ParentCompany


Cash
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value342171112142189260
Percentage of CashAndCashEquivalentsAtCarryingValue4.44.03.32.97.79.6
Percentage of Assets0.20.10.10.10.20.3
Percentage of Assets srt:ParentCompany1.71.21.21.50.00.0

us-gaap:VariableInterestEntityPrimaryBeneficiary


Cash
Period End2020-12-312020-09-302020-06-302020-03-312019-12-31
Value0.00.00.00.03.0
Percentage of CashAndCashEquivalentsAtCarryingValue0.00.00.00.00.1
Percentage of Assets0.00.00.00.00.0
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary0.00.00.00.00.0

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value87266973844287747521598346424035523935203405394337882825499737083585263825162836
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.03.44.24.64.14.23.22.83.82.62.73.33.33.05.03.93.83.02.93.5

Short Term Investments

us-gaap:ShortTermInvestments

us-gaap:ShortTermInvestments


Short
Period End2020-09-302019-12-31
Value165596
Percentage of ShortTermInvestments100.0100.0
Percentage of Assets0.10.4

us-gaap:ShortTermInvestments us-gaap:BalanceSheetLocation

ahl:InvestmentsExcludingInvestmentsInRelatedParty


Short
Period End2021-06-302021-03-312020-12-312019-12-31
Value101125222596
Percentage of ShortTermInvestments0.00.00.0100.0
Percentage of Assets0.00.10.10.4
Percentage of Assets ahl:InvestmentsExcludingInvestmentsInRelatedParty0.00.00.00.0

us-gaap:ShortTermInvestments us-gaap:BalanceSheetLocation, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis

ahl:InvestmentsExcludingInvestmentsInRelatedParty, us-gaap:FairValueInputsLevel3, us-gaap:EstimateOfFairValueFairValueDisclosure


Short
Period End2021-03-312019-12-31
Value8.0190
Percentage of ShortTermInvestments0.031.9
Percentage of Assets0.00.1
Percentage of Assets ahl:InvestmentsExcludingInvestmentsInRelatedParty us-gaap:FairValueInputsLevel3 us-gaap:EstimateOfFairValueFairValueDisclosure0.00.0

us-gaap:ShortTermInvestments us-gaap:BalanceSheetLocation, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

ahl:InvestmentsExcludingInvestmentsInRelatedParty, us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring


Short
Period End2021-06-302021-03-312020-12-312019-12-31
Value585114646
Percentage of ShortTermInvestments0.00.00.07.7
Percentage of Assets0.00.00.10.0
Percentage of Assets ahl:InvestmentsExcludingInvestmentsInRelatedParty us-gaap:FairValueInputsLevel1 us-gaap:FairValueMeasurementsRecurring0.00.00.00.0

ahl:InvestmentsExcludingInvestmentsInRelatedParty, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Short
Period End2021-06-302021-03-312020-12-312019-12-31
Value436674319
Percentage of ShortTermInvestments0.00.00.053.5
Percentage of Assets0.00.00.00.2
Percentage of Assets ahl:InvestmentsExcludingInvestmentsInRelatedParty us-gaap:FairValueInputsLevel2 us-gaap:FairValueMeasurementsRecurring0.00.00.00.0

ahl:InvestmentsExcludingInvestmentsInRelatedParty, us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring


Short
Period End2020-12-312019-12-31
Value2.041
Percentage of ShortTermInvestments0.06.9
Percentage of Assets0.00.0
Percentage of Assets ahl:InvestmentsExcludingInvestmentsInRelatedParty us-gaap:FairValueInputsLevel3 us-gaap:FairValueMeasurementsRecurring0.00.0

us-gaap:ShortTermInvestments us-gaap:BalanceSheetLocation, us-gaap:FairValueByMeasurementBasis

ahl:InvestmentsExcludingInvestmentsInRelatedParty, us-gaap:CarryingReportedAmountFairValueDisclosure


Short
Period End2021-03-312019-12-31
Value8.0190
Percentage of ShortTermInvestments0.031.9
Percentage of Assets0.00.1
Percentage of Assets ahl:InvestmentsExcludingInvestmentsInRelatedParty us-gaap:CarryingReportedAmountFairValueDisclosure0.00.0

ahl:InvestmentsExcludingInvestmentsInRelatedParty, us-gaap:EstimateOfFairValueFairValueDisclosure


Short
Period End2021-03-312019-12-31
Value8.0190
Percentage of ShortTermInvestments0.031.9
Percentage of Assets0.00.1
Percentage of Assets ahl:InvestmentsExcludingInvestmentsInRelatedParty us-gaap:EstimateOfFairValueFairValueDisclosure0.00.0

us-gaap:ShortTermInvestments us-gaap:BalanceSheetLocation, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

ahl:InvestmentsExcludingInvestmentsInRelatedParty, us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring


Short
Period End2021-06-302021-03-312020-12-312019-12-31
Value101117222406
Percentage of ShortTermInvestments0.00.00.068.1
Percentage of Assets0.00.10.10.3
Percentage of Assets ahl:InvestmentsExcludingInvestmentsInRelatedParty us-gaap:EstimateOfFairValueFairValueDisclosure us-gaap:FairValueMeasurementsRecurring0.00.00.00.0

us-gaap:ShortTermInvestments us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring


Short
Period End2020-09-302020-06-302020-03-312019-12-31
Value45434246
Percentage of ShortTermInvestments27.30.00.07.7
Percentage of Assets0.00.00.00.0
Percentage of Assets us-gaap:FairValueInputsLevel1 us-gaap:FairValueMeasurementsRecurring0.00.00.00.0

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Short
Period End2020-09-302020-06-302020-03-312019-12-31
Value110207284319
Percentage of ShortTermInvestments66.70.00.053.5
Percentage of Assets0.10.10.20.2
Percentage of Assets us-gaap:FairValueInputsLevel2 us-gaap:FairValueMeasurementsRecurring0.00.00.00.0

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring


Short
Period End2020-09-302020-06-302020-03-312019-12-31
Value10.01146741
Percentage of ShortTermInvestments6.10.00.06.9
Percentage of Assets0.00.10.00.0
Percentage of Assets us-gaap:FairValueInputsLevel3 us-gaap:FairValueMeasurementsRecurring0.00.00.00.0

us-gaap:ShortTermInvestments us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring


Short
Period End2020-09-302020-06-302020-03-312019-12-31
Value165364393406
Percentage of ShortTermInvestments100.00.00.068.1
Percentage of Assets0.10.20.30.3
Percentage of Assets us-gaap:EstimateOfFairValueFairValueDisclosure us-gaap:FairValueMeasurementsRecurring0.00.00.00.0

Equity Securities Fv Ni

us-gaap:EquitySecuritiesFvNi us-gaap:BalanceSheetLocation, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:EquitySecuritiesFvNi

ahl:InvestmentsExcludingInvestmentsInRelatedParty, us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring


Equity
Period End2021-06-302021-03-312020-12-312019-12-31
Value76365743
Percentage of EquitySecuritiesFvNi100.0100.0100.0100.0
Percentage of Assets0.00.00.00.0
Percentage of Assets ahl:InvestmentsExcludingInvestmentsInRelatedParty us-gaap:FairValueInputsLevel1 us-gaap:FairValueMeasurementsRecurring0.00.00.00.0

ahl:InvestmentsExcludingInvestmentsInRelatedParty, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Equity
Period End2021-06-302021-03-312020-12-312019-12-31
Value300272262201
Percentage of EquitySecuritiesFvNi394.7755.6459.6467.4
Percentage of Assets0.10.10.10.1
Percentage of Assets ahl:InvestmentsExcludingInvestmentsInRelatedParty us-gaap:FairValueInputsLevel2 us-gaap:FairValueMeasurementsRecurring0.00.00.00.0

ahl:InvestmentsExcludingInvestmentsInRelatedParty, us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring


Equity
Period End2021-06-302021-03-312020-12-312019-12-31
Value2214113.0
Percentage of EquitySecuritiesFvNi28.938.919.37.0
Percentage of Assets0.00.00.00.0
Percentage of Assets ahl:InvestmentsExcludingInvestmentsInRelatedParty us-gaap:FairValueInputsLevel3 us-gaap:FairValueMeasurementsRecurring0.00.00.00.0

us-gaap:EquitySecuritiesFvNi us-gaap:BalanceSheetLocation, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

ahl:InvestmentsExcludingInvestmentsInRelatedParty, us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring


Equity
Period End2021-06-302021-03-312020-12-312019-12-31
Value398322330247
Percentage of EquitySecuritiesFvNi523.7894.4578.9574.4
Percentage of Assets0.20.20.20.2
Percentage of Assets ahl:InvestmentsExcludingInvestmentsInRelatedParty us-gaap:EstimateOfFairValueFairValueDisclosure us-gaap:FairValueMeasurementsRecurring0.00.00.00.0

us-gaap:EquitySecuritiesFvNi us-gaap:ConsolidatedEntities, us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:VariableInterestEntityPrimaryBeneficiary, srt:AffiliatedEntity


Equity
Period End2020-12-312020-09-302020-06-302020-03-312019-12-31
Value0.00.00.00.06.0
Percentage of EquitySecuritiesFvNi0.00.00.00.014.0
Percentage of Assets0.00.00.00.00.0
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary srt:AffiliatedEntity0.00.00.00.00.0

us-gaap:EquitySecuritiesFvNi us-gaap:CounterpartyName, us-gaap:RelatedPartyTransactionsByRelatedParty

ahl:AAInfrastructure, srt:AffiliatedEntity


Equity
Period End2020-12-312020-09-302020-06-302020-03-312019-12-31
Value7250524958
Percentage of EquitySecuritiesFvNi126.30.00.00.0134.9
Percentage of Assets0.00.00.00.00.0
Percentage of Assets ahl:AAInfrastructure srt:AffiliatedEntity0.00.00.00.00.0

us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring


Equity
Period End2020-09-302020-06-302020-03-312019-12-31
Value29282343
Percentage of EquitySecuritiesFvNi0.00.00.0100.0
Percentage of Assets0.00.00.00.0
Percentage of Assets us-gaap:FairValueInputsLevel1 us-gaap:FairValueMeasurementsRecurring0.00.00.00.0

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Equity
Period End2020-09-302020-06-302020-03-312019-12-31
Value220203176201
Percentage of EquitySecuritiesFvNi0.00.00.0467.4
Percentage of Assets0.10.10.10.1
Percentage of Assets us-gaap:FairValueInputsLevel2 us-gaap:FairValueMeasurementsRecurring0.00.00.00.0

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring


Equity
Period End2020-09-302020-06-302020-03-312019-12-31
Value166.07.03.0
Percentage of EquitySecuritiesFvNi0.00.00.07.0
Percentage of Assets0.00.00.00.0
Percentage of Assets us-gaap:FairValueInputsLevel3 us-gaap:FairValueMeasurementsRecurring0.00.00.00.0

us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring, srt:AffiliatedEntity


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value1151147250524964
Percentage of EquitySecuritiesFvNi151.3316.7126.30.00.00.0148.8
Percentage of Assets0.10.10.00.00.00.00.0
Percentage of Assets us-gaap:FairValueInputsLevel3 us-gaap:FairValueMeasurementsRecurring srt:AffiliatedEntity0.00.00.00.00.00.00.0

us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring


Equity
Period End2020-09-302020-06-302020-03-312019-12-31
Value265237206247
Percentage of EquitySecuritiesFvNi0.00.00.0574.4
Percentage of Assets0.10.10.10.2
Percentage of Assets us-gaap:EstimateOfFairValueFairValueDisclosure us-gaap:FairValueMeasurementsRecurring0.00.00.00.0

us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring, srt:AffiliatedEntity


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value1151147250524964
Percentage of EquitySecuritiesFvNi151.3316.7126.30.00.00.0148.8
Percentage of Assets0.10.10.00.00.00.00.0
Percentage of Assets us-gaap:EstimateOfFairValueFairValueDisclosure us-gaap:FairValueMeasurementsRecurring srt:AffiliatedEntity0.00.00.00.00.00.00.0

us-gaap:EquitySecuritiesFvNi us-gaap:RelatedPartyTransactionsByRelatedParty

srt:AffiliatedEntity


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value1151147250524964
Percentage of EquitySecuritiesFvNi151.3316.7126.30.00.00.0148.8
Percentage of Assets0.10.10.00.00.00.00.0
Percentage of Assets srt:AffiliatedEntity0.00.00.00.00.00.00.0

Other Assets

us-gaap:OtherAssets

us-gaap:OtherAssets


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value1713178512491044106719461005
Percentage of OtherAssets100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.80.90.60.50.61.40.7

us-gaap:OtherAssets dei:LegalEntity, us-gaap:ConsolidatedEntities, us-gaap:BalanceSheetLocation

ahl:Java, us-gaap:VariableInterestEntityPrimaryBeneficiary, ahl:InvestmentsExcludingInvestmentsInRelatedParty


Other
Period End2021-06-302021-03-31
Value17151
Percentage of OtherAssets1.08.5
Percentage of Assets0.00.1
Percentage of Assets ahl:Java us-gaap:VariableInterestEntityPrimaryBeneficiary ahl:InvestmentsExcludingInvestmentsInRelatedParty0.00.0

us-gaap:OtherAssets us-gaap:ConsolidatedEntities

srt:ParentCompany


Other
Period End2020-12-312019-12-312018-12-312017-12-31
Value436.0243.0
Percentage of OtherAssets3.40.60.00.0
Percentage of Assets0.00.00.00.0
Percentage of Assets srt:ParentCompany0.20.00.30.0

us-gaap:VariableInterestEntityPrimaryBeneficiary


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value251731.01.06.01920
Percentage of OtherAssets1.59.70.10.10.61.02.0
Percentage of Assets0.00.10.00.00.00.00.0
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary0.00.00.00.00.00.00.0

Long Term Debt

us-gaap:LongTermDebt

us-gaap:LongTermDebt


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value24681977197614871486986992
Percentage of LongTermDebt100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.11.01.00.80.80.70.7

us-gaap:LongTermDebt us-gaap:ConsolidatedEntities

srt:ParentCompany


Long
Period End2020-12-312019-12-312018-12-31
Value1976992991
Percentage of LongTermDebt100.0100.00.0
Percentage of Assets1.00.70.8
Percentage of Assets srt:ParentCompany9.56.910.5

us-gaap:LongTermDebt us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis

us-gaap:FairValueInputsLevel2, us-gaap:EstimateOfFairValueFairValueDisclosure


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value282022152259109910359031036
Percentage of LongTermDebt114.3112.0114.373.969.791.6104.4
Percentage of Assets1.31.11.10.60.60.60.7
Percentage of Assets us-gaap:FairValueInputsLevel2 us-gaap:EstimateOfFairValueFairValueDisclosure0.00.00.00.00.00.00.0

us-gaap:LongTermDebt us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value24681977197614871486986992
Percentage of LongTermDebt100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.11.01.00.80.80.70.7
Percentage of Assets us-gaap:CarryingReportedAmountFairValueDisclosure0.00.00.00.00.00.00.0

us-gaap:EstimateOfFairValueFairValueDisclosure


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value282022152259109910359031036
Percentage of LongTermDebt114.3112.0114.373.969.791.6104.4
Percentage of Assets1.31.11.10.60.60.60.7
Percentage of Assets us-gaap:EstimateOfFairValueFairValueDisclosure0.00.00.00.00.00.00.0

Minority Interest

us-gaap:MinorityInterest

us-gaap:MinorityInterest


Minority
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value16651045148311749285907500.00.00.00.00.01.01.0
Percentage of MinorityInterest100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.0100.0100.0
Percentage of Assets0.80.50.70.60.50.40.50.00.00.00.00.00.00.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value20006172911865715943147119940133918276920886698284759769055362
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets9.38.49.28.38.07.09.16.69.29.08.98.58.06.6

us-gaap:StockholdersEquity us-gaap:ConsolidatedEntities

srt:ParentCompany


Stockholders
Period End2020-12-312019-12-312018-12-312017-12-31
Value186571339182769176
Percentage of StockholdersEquity100.0100.0100.099.7
Percentage of Assets9.29.16.69.2
Percentage of Assets srt:ParentCompany90.292.587.998.5

Stockholders Equity Including Portion Attributable To Noncontrolling Interest

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-312013-12-31
Value21671183362014017117156391053014141135451236510117827690698505869592088669828475976906703164275639536345882855
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets10.18.99.99.08.57.49.69.48.97.66.67.77.49.39.29.08.98.58.00.00.00.06.65.50.0

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:EquityMethodInvestmentNonconsolidatedInvestee

us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther


Stockholders
Period End2020-12-312019-12-31
Value2115318742
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest105.0132.5
Percentage of Assets10.412.8
Percentage of Assets us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther16.237.1

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-312013-12-31
Value33372021397128882184-1174.0228124421760706-472.043126585141511621060673367920569-52.0-237.064470
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest15.411.019.716.914.0-11.116.118.014.27.0-5.70.51.56.715.413.412.88.95.313.18.9-0.9-4.414.02.5
Percentage of Assets1.51.02.01.51.2-0.81.61.71.30.5-0.40.00.10.61.41.21.10.80.40.00.00.0-0.30.80.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-312013-12-31
Value6640662366136045609055014171443541443448346234993492348534723461345234363421340332763285328121531348
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest30.636.132.835.338.952.229.532.733.534.141.838.641.140.137.739.941.745.249.548.451.058.361.246.947.2
Percentage of Assets3.13.23.33.23.33.92.83.13.02.62.83.03.03.73.53.63.73.93.90.00.00.04.12.60.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NoncontrollingInterest


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-312013-12-31
Value16651045148311749285907500.00.00.00.00.00.00.00.00.00.01.01.01.01.01.03394
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest7.75.77.46.95.95.65.30.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.73.3
Percentage of Assets0.80.50.70.60.50.40.50.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:NoncontrollingInterest0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Parent


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-312013-12-31
Value2000617291186571594314711994013391135451236510117827690698505869592088669828475976905703064265638536245552761
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest92.394.392.693.194.194.494.7100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.099.396.7
Percentage of Assets9.38.49.28.38.07.09.19.48.97.66.67.77.49.39.29.08.98.58.00.00.00.06.65.50.0
Percentage of Assets us-gaap:Parent0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-312013-12-31
Value10029864780737010643756136939666864615963528655274887462543214046377234883117270725812405231817581343
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest46.347.240.141.041.253.349.149.252.358.963.960.957.553.246.946.745.545.945.138.540.242.643.238.347.0
Percentage of Assets4.74.24.03.73.53.94.74.64.64.54.24.74.34.94.34.24.03.93.60.00.00.02.92.10.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Additional Paid In Capital

us-gaap:AdditionalPaidInCapital

us-gaap:AdditionalPaidInCapital


Additional
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value66406623661360456090550141714435414434483462349934923485347234613452343634213281
Percentage of AdditionalPaidInCapital100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.13.23.33.23.33.92.83.13.02.62.83.03.03.73.53.63.73.93.94.1

us-gaap:AdditionalPaidInCapital us-gaap:ConsolidatedEntities

srt:ParentCompany


Additional
Period End2020-12-312019-12-312018-12-312017-12-31
Value6613417134623472
Percentage of AdditionalPaidInCapital100.0100.0100.0100.0
Percentage of Assets3.32.82.83.5
Percentage of Assets srt:ParentCompany32.028.836.837.3

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:RetainedEarningsAccumulatedDeficit


Retained
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value100298647807370106437561369396668646159635286552748874625432140463772348831172318
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.74.24.03.73.53.94.74.64.64.54.24.74.34.94.34.24.03.93.62.9

us-gaap:RetainedEarningsAccumulatedDeficit us-gaap:ConsolidatedEntities

srt:ParentCompany


Retained
Period End2020-12-312019-12-312018-12-312017-12-31
Value8073693952864255
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.098.5
Percentage of Assets4.04.74.24.3
Percentage of Assets srt:ParentCompany39.048.056.145.7

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value33372021397128882184-1174.0228124421760706-472.043126585141511621060673367-237.0
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.51.02.01.51.2-0.81.61.71.30.5-0.40.00.10.61.41.21.10.80.4-0.3

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax us-gaap:ConsolidatedEntities

srt:ParentCompany


Accumulated
Period End2020-12-312019-12-312018-12-312017-12-31
Value39712281-472.01449
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0102.4
Percentage of Assets2.01.6-0.41.5
Percentage of Assets srt:ParentCompany19.215.8-5.015.6

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax us-gaap:RelatedPartyTransactionsByRelatedParty

srt:AffiliatedEntity


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value605559-19.0-106.0-457.0172214-12.0-25.0-7.0-2.048
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax1.82.71.5-0.7-4.938.90.70.90.8-1.75.3-16.3-1.63.4
Percentage of Assets0.00.00.0-0.0-0.1-0.30.00.00.0-0.0-0.0-0.0-0.00.0
Percentage of Assets srt:AffiliatedEntity0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents

ahl:AccumulatedForeignCurrencyAdjustmentandOtherAttributabletoParent


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312016-12-31
Value9.08.08.03.0-5.00.0-3.0-6.0-5.0-4.0-4.04.0-15.0
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax0.30.40.20.1-0.2-0.0-0.1-0.2-0.3-0.60.80.3-4.1
Percentage of Assets0.00.00.00.0-0.00.0-0.0-0.0-0.0-0.0-0.00.0-0.0
Percentage of Assets ahl:AccumulatedForeignCurrencyAdjustmentandOtherAttributabletoParent0.00.00.00.00.00.00.00.00.00.00.00.00.0

ahl:AccumulatedForeignCurrencyAdjustmentandOtherIncludingPortionAttributabletoNoncontrollingInterest


Accumulated
Period End2021-06-302021-03-312020-12-312020-06-302019-12-312018-12-312017-12-31
Value9.08.08.0-5.0-3.0-4.04.0
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax0.30.40.2-0.2-0.10.80.3
Percentage of Assets0.00.00.0-0.0-0.0-0.00.0
Percentage of Assets ahl:AccumulatedForeignCurrencyAdjustmentandOtherIncludingPortionAttributabletoNoncontrollingInterest0.00.00.00.00.00.00.0

ahl:AccumulatedNetInvestmentGainLossIncludingDeferredAcquisitionCostsDeferredSalesInducementsValueofBusinessAcquiredFuturePolicyBenefitsIncludingNoncontrollingInterest


Accumulated
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-312018-12-312017-12-31
Value-1082.0-717.0-1310.0-873.0195-879.0121-568.0
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax-32.4-35.5-33.0-40.0-16.6-38.5-25.6-40.1
Percentage of Assets-0.5-0.3-0.6-0.50.1-0.60.1-0.6
Percentage of Assets ahl:AccumulatedNetInvestmentGainLossIncludingDeferredAcquisitionCostsDeferredSalesInducementsValueofBusinessAcquiredFuturePolicyBenefitsIncludingNoncontrollingInterest0.00.00.00.00.00.00.00.0

ahl:DeferredAcquisitionCostsDeferredSalesInducementsDeferredValueofBusinessAcquiredandFuturePolicyBenefitAdjustmentonAvailableforsaleSecuritiesAttributabletoParent


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312016-12-31
Value-1082.0-717.0-1310.0-1098.0-873.0195-879.0-969.0-661.0-282.0121-568.0-298.0
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax-32.4-35.5-33.0-38.0-40.0-16.6-38.5-39.7-37.6-39.9-25.6-40.1-81.2
Percentage of Assets-0.5-0.3-0.6-0.6-0.50.1-0.6-0.7-0.5-0.20.1-0.6-0.3
Percentage of Assets ahl:DeferredAcquisitionCostsDeferredSalesInducementsDeferredValueofBusinessAcquiredandFuturePolicyBenefitAdjustmentonAvailableforsaleSecuritiesAttributabletoParent0.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedNetGainLossFromCashFlowHedgesIncludingPortionAttributableToNoncontrollingInterest


Accumulated
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-312018-12-312017-12-31
Value23-49.0-26.03203956139-76.0
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax0.7-2.4-0.714.7-33.62.7-8.3-5.4
Percentage of Assets0.0-0.0-0.00.20.30.00.0-0.1
Percentage of Assets us-gaap:AccumulatedNetGainLossFromCashFlowHedgesIncludingPortionAttributableToNoncontrollingInterest0.00.00.00.00.00.00.00.0

us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312016-12-31
Value23-49.0-26.017632039561175773339-76.06.0
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax0.7-2.4-0.76.114.7-33.62.77.24.44.7-8.3-5.41.6
Percentage of Assets0.0-0.0-0.00.10.20.30.00.10.10.00.0-0.10.0
Percentage of Assets us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges0.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithAllowanceForCreditLossIncludingNoncontrollingInterest


Accumulated
Period End2021-06-302021-03-312020-12-312020-06-302020-03-31
Value-36.0-104.0-39.0-34.0-224.0
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax-1.1-5.1-1.0-1.619.1
Percentage of Assets-0.0-0.1-0.0-0.0-0.2
Percentage of Assets us-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithAllowanceForCreditLossIncludingNoncontrollingInterest0.00.00.00.00.0

us-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithAllowanceForCreditLossParent


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value-36.0-29.0-39.0-101.0-702.0-224.00.0
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax-1.1-1.4-1.0-3.5-32.119.10.0
Percentage of Assets-0.0-0.0-0.0-0.1-0.4-0.20.0
Percentage of Assets us-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithAllowanceForCreditLossParent0.00.00.00.00.00.00.0

us-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithoutAllowanceForCreditLossIncludingNoncontrollingInterest


Accumulated
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-312018-12-312017-12-31
Value4423288353382776-1540.03102-628.02089
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax132.5142.7134.4127.1131.2136.0133.1147.6
Percentage of Assets2.11.42.61.5-1.12.1-0.52.1
Percentage of Assets us-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithoutAllowanceForCreditLossIncludingNoncontrollingInterest0.00.00.00.00.00.00.00.0

us-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithoutAllowanceForCreditLossNoncontrollingInterest


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value44232808533839083444-1540.03102
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax132.5138.9134.4135.3157.7131.2136.0
Percentage of Assets2.11.42.62.01.9-1.12.1
Percentage of Assets us-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithoutAllowanceForCreditLossNoncontrollingInterest0.00.00.00.00.00.00.0

Minority Interest

us-gaap:MinorityInterest

us-gaap:MinorityInterest


Minority
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value16651045148311749285907500.00.00.00.00.01.01.0
Percentage of MinorityInterest100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.0100.0100.0
Percentage of Assets0.80.50.70.60.50.40.50.00.00.00.00.00.00.0

Stock Issued During Period Value New Issues

us-gaap:StockIssuedDuringPeriodValueNewIssues

us-gaap:StockIssuedDuringPeriodValueNewIssues


Stock
Period End2021-06-302021-03-312019-03-312018-12-312018-09-302018-06-302018-03-312016-12-312016-09-302016-06-302016-03-31
Value6.01.01.00.01.00.01.00.00.00.01.0
Percentage of StockIssuedDuringPeriodValueNewIssues100.0100.0100.00.0100.00.0100.00.00.00.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StockIssuedDuringPeriodValueNewIssues us-gaap:StatementClassOfStock

us-gaap:CommonStock


Stock
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value1.00.00.01509-1.02.01.0
Percentage of StockIssuedDuringPeriodValueNewIssues0.00.00.00.00.00.00.0
Percentage of Assets0.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.0

us-gaap:PreferredStock


Stock
Period End2020-12-312020-09-302020-06-302019-12-312019-09-302019-06-30
Value5570.05830.0333839
Percentage of StockIssuedDuringPeriodValueNewIssues0.00.00.00.00.00.0
Percentage of Assets0.00.00.00.00.00.0
Percentage of Assets us-gaap:PreferredStock0.00.00.00.00.00.0

us-gaap:StockIssuedDuringPeriodValueNewIssues us-gaap:StatementClassOfStock, us-gaap:StatementEquityComponents

us-gaap:CommonStock, us-gaap:AdditionalPaidInCapital


Stock
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value6.01.01.00.00.01509-1.02.01.01.00.01.0
Percentage of StockIssuedDuringPeriodValueNewIssues100.0100.00.00.00.00.00.00.00.0100.00.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock, us-gaap:Parent


Stock
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value6.01.01.00.00.01509-1.02.01.0
Percentage of StockIssuedDuringPeriodValueNewIssues100.0100.00.00.00.00.00.00.00.0
Percentage of Assets0.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock us-gaap:Parent0.00.00.00.00.00.00.00.00.0

us-gaap:PreferredStock, us-gaap:AdditionalPaidInCapital


Stock
Period End2020-12-312020-09-302020-06-302019-12-312019-09-302019-06-30
Value5570.05830.0333839
Percentage of StockIssuedDuringPeriodValueNewIssues0.00.00.00.00.00.0
Percentage of Assets0.00.00.00.00.00.0
Percentage of Assets us-gaap:PreferredStock us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.0

us-gaap:PreferredStock, us-gaap:Parent


Stock
Period End2020-12-312020-09-302020-06-302019-12-312019-09-302019-06-30
Value5570.05830.0333839
Percentage of StockIssuedDuringPeriodValueNewIssues0.00.00.00.00.00.0
Percentage of Assets0.00.00.00.00.00.0
Percentage of Assets us-gaap:PreferredStock us-gaap:Parent0.00.00.00.00.00.0

Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue


Adjustments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value119.0113.06.05.05.08.010.05.07.06.07.01210.09.01615181275.03.0
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Adjustments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value119.0113.06.05.05.08.010.05.07.06.07.01210.09.01615181275.03.0
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Parent


Adjustments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value119.0113.06.05.05.08.010.05.07.06.07.01210.09.01615181275.03.0
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:Parent0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Minority Interest Decrease From Distributions To Noncontrolling Interest Holders

us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders

us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders


Minority
Period End2020-12-312020-09-302020-06-302020-03-31
Value0.00.00.046
Percentage of MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders0.00.00.0100.0
Percentage of Assets0.00.00.00.0

us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest


Minority
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value0.00.00.00.00.046
Percentage of MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders0.00.00.00.00.0100.0
Percentage of Assets0.00.00.00.00.00.0
Percentage of Assets us-gaap:NoncontrollingInterest0.00.00.00.00.00.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value87216263229-477.063177167140257410091639716-54.05731828269644429235260316388
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues13.637.037.4-14.614.3-49.820.68.917.020.3142.027.7-3.056.747.218.336.526.522.120.430.253.7

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-4389.0-6883.0-7718.0-2363.0-4358.0-378.0-2697.0-3241.0-1242.0-2776.0-2027.0-2242.0-1020.0-2884.0-1315.0-1862.0-1500.0-1140.0-920.0-1649.0-148.0115
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-68.3-156.8-89.3-72.2-99.124.4-82.8-72.0-36.9-56.0-175.6-86.6-56.8-285.3-34.0-126.4-85.1-70.4-86.6-129.2-14.115.9

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value527037884155410052649702633163523871882-150.01681203713976917101756813588641422-496.0
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues82.086.348.1125.2119.7-62.680.936.370.937.9-13.065.0113.413.719.9116.199.650.255.450.240.3-68.7

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1753-1469.0-332.0125315381341607-1204.01719115
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues27.3-33.5-3.838.335.0-86.618.6-26.751.02.3

Increase Decrease In Other Operating Capital Net

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-146.0-120.0-209.057-171.0258-69.0-26.0-50.0-220.0
Percentage of IncreaseDecreaseInOtherOperatingCapitalNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value87216263229-477.063177167140257410091639716-54.05731828269644429235260316388
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues13.637.037.4-14.614.3-49.820.68.917.020.3142.027.7-3.056.747.218.336.526.522.120.430.253.7

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value14176141093652843-1047.0451293720708-104.06402642684642743263733681581928724272104144
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues22.114.012.719.919.267.613.96.521.414.3-9.024.714.726.512.018.618.523.034.712.418.312.023.232.119.117.9

Profit Loss

us-gaap:ProfitLoss

us-gaap:ProfitLoss


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value1806771322884931-1216.0464293720708-104.06402642684642743263733681581928724272104160
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues28.11.815.327.021.278.514.36.521.414.3-9.024.714.726.512.018.618.523.034.712.418.312.023.232.119.119.9

us-gaap:ProfitLoss us-gaap:CounterpartyName, us-gaap:EquityMethodInvestmentNonconsolidatedInvestee, us-gaap:RelatedPartyTransactionsByRelatedParty

ahl:AAMortgageOpportunitiesLP, us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther, srt:AffiliatedEntity


Profit
Period End2021-03-312020-03-31
Value26139
Percentage of ProfitLoss339.0-3.2
Percentage of Revenues5.9-2.5
Percentage of Revenues ahl:AAMortgageOpportunitiesLP us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther srt:AffiliatedEntity0.00.0

ahl:VenerableHoldingsInc., us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther, srt:AffiliatedEntity


Profit
Period End2021-03-312020-03-31
Value91348
Percentage of ProfitLoss1185.7-3.9
Percentage of Revenues20.8-3.1
Percentage of Revenues ahl:VenerableHoldingsInc. us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther srt:AffiliatedEntity0.00.0

us-gaap:ProfitLoss us-gaap:EquityMethodInvestmentNonconsolidatedInvestee

us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther


Profit
Period End2020-12-312019-12-31
Value1862729
Percentage of ProfitLoss140.8157.1
Percentage of Revenues21.622.4
Percentage of Revenues us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther0.00.0

us-gaap:ProfitLoss us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value389-537.022923288-169.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of ProfitLoss21.5-697.417.326.29.513.90.00.0-0.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Revenues6.1-12.22.77.12.010.90.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Revenues us-gaap:NoncontrollingInterest0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Parent


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value14176141093652843-1047.0451293720708-119.064026426846427433737340112619187
Percentage of ProfitLoss78.5797.482.773.890.586.197.2100.0100.0100.0114.4100.0100.0100.0100.0100.0103.4100.0109.079.799.5100.0
Percentage of Revenues22.114.012.719.919.267.613.96.521.414.3-10.324.714.726.512.018.619.123.037.89.918.212.0
Percentage of Revenues us-gaap:Parent0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value14176141093652843-1047.0451293720708-119.062325726846427433737340112619187
Percentage of ProfitLoss78.5797.482.773.890.586.197.2100.0100.0100.0114.497.397.3100.0100.0100.0103.4100.0109.079.799.5100.0
Percentage of Revenues22.114.012.719.919.267.613.96.521.414.3-10.324.114.326.512.018.619.123.037.89.918.212.0
Percentage of Revenues us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Share Based Compensation

us-gaap:ShareBasedCompensation us-gaap:ConsolidationItems

us-gaap:ShareBasedCompensation

us-gaap:MaterialReconcilingItems


Share
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value1.00.01.00.010.03.03.03.03.03.03.02.03.03.07.01313204628-15.0
Percentage of ShareBasedCompensation100.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-4389.0-6883.0-7718.0-2363.0-4358.0-378.0-2697.0-3241.0-1242.0-2776.0-2027.0-2242.0-1020.0-2884.0-1315.0-1862.0-1500.0-1140.0-920.0-1649.0-148.0115
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-68.3-156.8-89.3-72.2-99.124.4-82.8-72.0-36.9-56.0-175.6-86.6-56.8-285.3-34.0-126.4-85.1-70.4-86.6-129.2-14.115.9

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value527037884155410052649702633163523871882-150.01681203713976917101756813588641422-496.0
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues82.086.348.1125.2119.7-62.680.936.370.937.9-13.065.0113.413.719.9116.199.650.255.450.240.3-68.7

Proceeds From Issuance Of Long Term Debt

us-gaap:ProceedsFromIssuanceOfLongTermDebt

us-gaap:ProceedsFromIssuanceOfLongTermDebt


Proceeds
Period End2020-12-312020-09-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value4930.00.00.00.00.00.00.00.09980.00.00.00.0
Percentage of ProceedsFromIssuanceOfLongTermDebt100.00.00.00.00.00.00.00.00.0100.00.00.00.00.0

Payments For Repurchase Of Common Stock

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:PaymentsForRepurchaseOfCommonStock


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.04.03.0970.032828412137651
Percentage of PaymentsForRepurchaseOfCommonStock0.0100.0100.0100.00.0100.0100.0100.0100.0100.0

Deferred Tax Liabilities

us-gaap:DeferredTaxLiabilities

us-gaap:DeferredTaxLiabilities


Deferred
Period End2020-12-312019-12-312017-12-31
Value97242338
Percentage of DeferredTaxLiabilities100.0100.0100.0

us-gaap:DeferredTaxLiabilities us-gaap:BalanceSheetLocation

us-gaap:OtherLiabilities


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value9724230.0414.0
Percentage of DeferredTaxLiabilities100.0100.00.0107.90.0

Deferred Tax Assets Net

us-gaap:DeferredTaxAssetsNet

us-gaap:DeferredTaxAssetsNet


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value179118621429156517931551
Percentage of DeferredTaxAssetsNet100.0100.0100.0100.0100.0100.0

Deferred Tax Assets Valuation Allowance

us-gaap:DeferredTaxAssetsValuationAllowance

us-gaap:DeferredTaxAssetsValuationAllowance


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value7463526472193
Percentage of DeferredTaxAssetsValuationAllowance100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsValuationAllowance us-gaap:ValuationAllowanceByDeferredTaxAsset

ahl:UKnetoperatinglossesandotherdeferredtaxassets


Deferred
Period End2020-12-312019-12-312018-12-31
Value24160.0
Percentage of DeferredTaxAssetsValuationAllowance32.425.40.0

ahl:UnitedStatesFederalandStateNetOperatingLosses


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value5047521422100
Percentage of DeferredTaxAssetsValuationAllowance67.674.6100.021.930.651.8

ahl:AssetsContributedToConsolidatedVIEs

ahl:AssetsContributedToConsolidatedVIEs


Assets
Period End2021-06-302021-03-31
Value0.0169
Percentage of AssetsContributedToConsolidatedVIEs0.0100.0

ahl:CapOnAssetGrossBookYield us-gaap:CounterpartyName, us-gaap:RelatedPartyTransaction, us-gaap:RelatedPartyTransactionsByRelatedParty

ahl:CapOnAssetGrossBookYield

ahl:ApolloandAffiliates, ahl:Suballocatedassets, srt:AffiliatedEntity


Cap
Period End2021-06-302021-03-31
Value010.0
Percentage of CapOnAssetGrossBookYield0.0100.0

ahl:CommonStockVotingRightsMaximumVotingPowerforSingleShareholder

ahl:CommonStockVotingRightsMaximumVotingPowerforSingleShareholder


Common
Period End2020-12-312020-09-302020-06-302020-03-31
Value09.80100.099
Percentage of CommonStockVotingRightsMaximumVotingPowerforSingleShareholder0.0100.00.0100.0

ahl:DeferredPolicyAcquisitionCostsDeferredSalesInducementsandPresentValueofFutureProfitsAdditions

ahl:DeferredPolicyAcquisitionCostsDeferredSalesInducementsandPresentValueofFutureProfitsAdditions


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value2051972172302141501632242512337572611559168162164186142207265195134
Percentage of DeferredPolicyAcquisitionCostsDeferredSalesInducementsandPresentValueofFutureProfitsAdditions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ahl:DeferredPolicyAcquisitionCostsDeferredSalesInducementsandPresentValueofFutureProfitsAdditions us-gaap:AdjustmentsForNewAccountingPronouncements

us-gaap:AccountingStandardsUpdate201613


Deferred
Period End2020-09-302020-06-302020-03-312020-01-01
Value0.00.02222
Percentage of DeferredPolicyAcquisitionCostsDeferredSalesInducementsandPresentValueofFutureProfitsAdditions0.00.014.70.0

ahl:DeferredPolicyAcquisitionCostsDeferredSalesInducementsandPresentValueofFutureProfitsAmortizationExpenseExcludingUnlocking

ahl:DeferredPolicyAcquisitionCostsDeferredSalesInducementsandPresentValueofFutureProfitsAmortizationExpenseExcludingUnlocking


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value252248303287340-403.0179193274236-49.013511510912010974126115956432
Percentage of DeferredPolicyAcquisitionCostsDeferredSalesInducementsandPresentValueofFutureProfitsAmortizationExpenseExcludingUnlocking100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ahl:DeferredPolicyAcquisitionCostsDeferredSalesInducementsandPresentValueofFutureProfitsUnrealizedInvestmentGainsLosses

ahl:DeferredPolicyAcquisitionCostsDeferredSalesInducementsandPresentValueofFutureProfitsUnrealizedInvestmentGainsLosses


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value292-448.0173186798-809.0-64.0245272285-87.0-49.0-129.0-153.015549785-171.011516349
Percentage of DeferredPolicyAcquisitionCostsDeferredSalesInducementsandPresentValueofFutureProfitsUnrealizedInvestmentGainsLosses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ahl:Deferredsalesinducementamortizationexpenseexcludingunlocking

ahl:Deferredsalesinducementamortizationexpenseexcludingunlocking


Deferredsalesinducementamortizationexpenseexcludingunlocking
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value22842935-21.010.03611135.0
Percentage of Deferredsalesinducementamortizationexpenseexcludingunlocking100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ahl:GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNetRecordedInOtherComprehensiveIncome us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation

ahl:GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNetRecordedInOtherComprehensiveIncome

us-gaap:ForeignExchangeForward, us-gaap:FairValueHedging, us-gaap:DesignatedAsHedgingInstrument


Gain
Period End2021-06-302020-06-30
Value4000000.00
Percentage of GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNetRecordedInOtherComprehensiveIncome100.00.0

ahl:GainLossonInvestmentsandDerivatives

ahl:GainLossonInvestmentsandDerivatives


Gain
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value12576511149752930-2144.0802156576950
Percentage of GainLossonInvestmentsandDerivatives100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ahl:GainLossonInvestmentsandDerivatives us-gaap:ConsolidatedEntities

us-gaap:VariableInterestEntityPrimaryBeneficiary


Gain
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value19-67.00.01.0-7.00.0-5.02.0
Percentage of GainLossonInvestmentsandDerivatives1.5-10.30.00.1-0.8-0.0-0.61.3

ahl:GainLossonInvestmentsandDerivatives us-gaap:RelatedPartyTransactionsByRelatedParty

srt:AffiliatedEntity


Gain
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value8277426083-158.0-10.01110.05.0
Percentage of GainLossonInvestmentsandDerivatives6.511.83.78.08.97.4-1.27.11.70.5

ahl:Gainlossoninvestmentsnetofoffsets us-gaap:ConsolidationItems

ahl:Gainlossoninvestmentsnetofoffsets

us-gaap:MaterialReconcilingItems


Gainlossoninvestmentsnetofoffsetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value517-605.0526346775-1139.0-47.0166417458-119.0-48.0-74.0-33.0592558
Percentage of Gainlossoninvestmentsnetofoffsets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ahl:IncreaseDecreaseinInterestSensitiveContractLiabilities

ahl:IncreaseDecreaseinInterestSensitiveContractLiabilities


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1822-34.0165610801893-1282.09176899941403
Percentage of IncreaseDecreaseinInterestSensitiveContractLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ahl:IncreaseDecreaseinInterestSensitiveContractLiabilities us-gaap:RelatedPartyTransactionsByRelatedParty

srt:AffiliatedEntity


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1246414133183-81.01337497167
Percentage of IncreaseDecreaseinInterestSensitiveContractLiabilities6.8-188.28.53.19.76.314.510.79.811.9

ahl:IntegrationRestructuringandOtherNonOperatingExpense us-gaap:ConsolidationItems

ahl:IntegrationRestructuringandOtherNonOperatingExpense

us-gaap:MaterialReconcilingItems


Integration
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value1145-3.00.09.04.02434111.04.02.08.08.03414119.0142.05.01.0
Percentage of IntegrationRestructuringandOtherNonOperatingExpense100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ahl:InterestSensitiveContractBenefitsExpense

ahl:InterestSensitiveContractBenefitsExpense


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1979394190912252076-1319.0114680110941516
Percentage of InterestSensitiveContractBenefitsExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ahl:InterestSensitiveContractBenefitsExpense us-gaap:RelatedPartyTransactionsByRelatedParty

srt:AffiliatedEntity


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1357615243197-97.011797114183
Percentage of InterestSensitiveContractBenefitsExpense6.819.38.03.59.57.410.212.110.412.1

ahl:LossonDerivativeInstrumentsNetofExpensesPretax us-gaap:ConsolidationItems

ahl:LossonDerivativeInstrumentsNetofExpensesPretax

us-gaap:MaterialReconcilingItems


Losson
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value68-488.0-33.0-72.0405-65.0-136.01175727308-380.0-75.0-95.0-111.0-46.0-15.0-94.0-185.01.01869
Percentage of LossonDerivativeInstrumentsNetofExpensesPretax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ahl:PaymentsforCoinsuranceAgreementContractsInvestmentType

ahl:PaymentsforCoinsuranceAgreementContractsInvestmentType


Paymentsfor
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value8.010.06.05.06.05.08.06.025
Percentage of PaymentsforCoinsuranceAgreementContractsInvestmentType100.0100.0100.0100.0100.0100.0100.0100.0100.0

ahl:PaymentstoAcquireInvestmentFunds

ahl:PaymentstoAcquireInvestmentFunds


Paymentsto
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value589467566139456375247265315185
Percentage of PaymentstoAcquireInvestmentFunds100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ahl:PaymentstoAcquireInvestmentFunds us-gaap:ConsolidatedEntities

us-gaap:VariableInterestEntityPrimaryBeneficiary


Paymentsto
Period End2020-12-312020-09-302019-12-312019-09-30
Value0.00.0836.0
Percentage of PaymentstoAcquireInvestmentFunds0.00.033.62.3

ahl:PaymentstoAcquireInvestmentFunds us-gaap:RelatedPartyTransactionsByRelatedParty

srt:AffiliatedEntity


Paymentsto
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value494429458107449358201235250152
Percentage of PaymentstoAcquireInvestmentFunds83.991.980.977.098.595.581.488.779.482.2

ahl:Paymentstoacquireequitysecurities

ahl:Paymentstoacquireequitysecurities


Paymentstoacquireequitysecurities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value7548881465133.03089
Percentage of Paymentstoacquireequitysecurities100.0100.0100.0100.0100.0100.0100.0100.0

ahl:ProceedsfromInvestmentFunds

ahl:ProceedsfromInvestmentFunds


Proceedsfrom
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value77317332315220211112012353133
Percentage of ProceedsfromInvestmentFunds100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ahl:ProceedsfromInvestmentFunds us-gaap:ConsolidatedEntities

us-gaap:VariableInterestEntityPrimaryBeneficiary


Proceedsfrom
Period End2020-12-312020-09-302019-12-312019-09-30
Value0.00.05.03.0
Percentage of ProceedsfromInvestmentFunds0.00.04.22.4

ahl:ProceedsfromInvestmentFunds us-gaap:CounterpartyName, us-gaap:InvestmentType, us-gaap:RelatedPartyTransactionsByRelatedParty

ahl:VenerableHoldingsInc., ahl:DifferentiatedInvestments, srt:AffiliatedEntity


Proceedsfrom
Period End2021-06-30
Value24
Percentage of ProceedsfromInvestmentFunds3.1

ahl:ProceedsfromInvestmentFunds us-gaap:CounterpartyName, us-gaap:InvestmentType, us-gaap:RelatedPartyTransactionsByRelatedParty, us-gaap:SubsequentEventType

ahl:VenerableHoldingsInc., ahl:DifferentiatedInvestments, srt:AffiliatedEntity, us-gaap:SubsequentEvent


Proceedsfrom
Period End2021-09-302021-07-31
Value1366
Percentage of ProceedsfromInvestmentFunds0.00.0

ahl:ProceedsfromInvestmentFunds us-gaap:RelatedPartyTransactionsByRelatedParty

srt:AffiliatedEntity


Proceedsfrom
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value73715528316717665100802987
Percentage of ProceedsfromInvestmentFunds95.389.687.6109.987.158.683.365.054.765.4

ahl:Proceedsfromsaleofequitysecurities

ahl:Proceedsfromsaleofequitysecurities


Proceedsfromsaleofequitysecurities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value4.0388143.01.02.018550
Percentage of Proceedsfromsaleofequitysecurities100.0100.0100.0100.0100.0100.0100.0100.0

ahl:ReinsuranceAgreementsDepositsonInvestmentPoliciesandContracts

ahl:ReinsuranceAgreementsDepositsonInvestmentPoliciesandContracts


Reinsurance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value2352142961799279461311631962152088024261181391081521262161693528761314899
Percentage of ReinsuranceAgreementsDepositsonInvestmentPoliciesandContracts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ahl:ReinsuranceAgreementsDepositsonInvestmentPoliciesandContracts us-gaap:RelatedPartyTransactionsByRelatedParty

srt:AffiliatedEntity


Reinsurance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value751029296847258516345
Percentage of ReinsuranceAgreementsDepositsonInvestmentPoliciesandContracts31.947.731.15.30.355.035.626.029.321.6

ahl:ReinsuranceAgreementsWithdrawalsonInvestmentPoliciesandContracts

ahl:ReinsuranceAgreementsWithdrawalsonInvestmentPoliciesandContracts


Reinsurance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value217619251697141897292362989198588894455825091921051031821671158779
Percentage of ReinsuranceAgreementsWithdrawalsonInvestmentPoliciesandContracts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ahl:ReinsuranceAgreementsWithdrawalsonInvestmentPoliciesandContracts us-gaap:RelatedPartyTransactionsByRelatedParty

srt:AffiliatedEntity


Reinsurance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value411408372333312418402441481429
Percentage of ReinsuranceAgreementsWithdrawalsonInvestmentPoliciesandContracts18.921.221.923.532.145.363.949.548.848.3

ahl:VariableInterestEntityExpenseandNoncontrollingInterest us-gaap:ConsolidationItems

ahl:VariableInterestEntityExpenseandNoncontrollingInterest

us-gaap:MaterialReconcilingItems


Variable
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-1417.0-1080.0-1724.0-474.0-363.0332-637.00.00.0-4.00.01.0-2.00.00.00.00.0-26.04.0-5.0-4.0
Percentage of VariableInterestEntityExpenseandNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.00.00.0100.00.0100.0100.00.00.00.00.0100.0100.0100.0100.0

us-gaap:AccretionAmortizationOfDiscountsAndPremiumsInvestments

us-gaap:AccretionAmortizationOfDiscountsAndPremiumsInvestments


Accretion
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value694964482962346.02133
Percentage of AccretionAmortizationOfDiscountsAndPremiumsInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssumedPremiumsEarned

us-gaap:AssumedPremiumsEarned


Assumed
Period End2020-12-312020-09-302020-06-302019-12-312019-09-302019-06-30
Value1291011098995762
Percentage of AssumedPremiumsEarned100.0100.0100.0100.0100.0100.0

us-gaap:CashDivestedFromDeconsolidation

us-gaap:CashDivestedFromDeconsolidation


Cash
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0.00.00.03.00.00.00.00.00.00.00.02960.00.00.00.0
Percentage of CashDivestedFromDeconsolidation0.00.00.0100.00.00.00.00.00.00.00.0100.00.00.00.00.0

us-gaap:CededPremiumsEarned

us-gaap:CededPremiumsEarned


Ceded
Period End2020-12-312020-09-302020-06-302019-12-312019-09-302019-06-30
Value403135363040
Percentage of CededPremiumsEarned100.0100.0100.0100.0100.0100.0

us-gaap:ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1 us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation

us-gaap:ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1

us-gaap:ForeignExchangeForward, us-gaap:FairValueHedging, us-gaap:DesignatedAsHedgingInstrument


Change
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-52.0-20.012-11.0133.03.0
Percentage of ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1100.0100.0100.0100.0100.0100.0100.0

us-gaap:ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1 us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation

us-gaap:CrossCurrencyInterestRateContract, us-gaap:FairValueHedging, us-gaap:DesignatedAsHedgingInstrument, ahl:InterestSensitiveContractBenefits


Change
Period End2021-06-302021-03-31
Value5.01.0
Percentage of ChangeInUnrealizedGainLossOnFairValueHedgingInstruments10.00.0

us-gaap:CrossCurrencyInterestRateContract, us-gaap:FairValueHedging, us-gaap:DesignatedAsHedgingInstrument, us-gaap:GainLossOnInvestmentsMember1


Change
Period End2021-06-302021-03-31
Value5.0-36.0
Percentage of ChangeInUnrealizedGainLossOnFairValueHedgingInstruments10.00.0

us-gaap:ForeignExchangeForward, us-gaap:FairValueHedging, us-gaap:DesignatedAsHedgingInstrument, us-gaap:GainLossOnInvestmentsMember1


Change
Period End2021-06-302021-03-31
Value-13.0218
Percentage of ChangeInUnrealizedGainLossOnFairValueHedgingInstruments10.00.0

us-gaap:ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1 us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation

us-gaap:ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1

us-gaap:ForeignExchangeForward, us-gaap:FairValueHedging, us-gaap:DesignatedAsHedgingInstrument


Change
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value5017-8.012-11.04.0-3.0
Percentage of ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1100.0100.0100.0100.0100.0100.0100.0

us-gaap:ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1 us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation

us-gaap:CrossCurrencyInterestRateContract, us-gaap:FairValueHedging, us-gaap:DesignatedAsHedgingInstrument, ahl:InterestSensitiveContractBenefits


Change
Period End2021-06-302021-03-31
Value-4.0-1.0
Percentage of ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge10.00.0

us-gaap:CrossCurrencyInterestRateContract, us-gaap:FairValueHedging, us-gaap:DesignatedAsHedgingInstrument, us-gaap:GainLossOnInvestmentsMember1


Change
Period End2021-06-302021-03-31
Value-9.041
Percentage of ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge10.00.0

us-gaap:ForeignExchangeForward, us-gaap:FairValueHedging, us-gaap:DesignatedAsHedgingInstrument, us-gaap:GainLossOnInvestmentsMember1


Change
Period End2021-06-302021-03-31
Value29-217.0
Percentage of ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge10.00.0

us-gaap:ConcentrationRiskPercentage1 us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType, us-gaap:FinancingReceivablePortfolioSegment

us-gaap:ConcentrationRiskPercentage1

ahl:MortgageLoansNet, ahl:PropertyTypeConcentrationRisk, us-gaap:CommercialRealEstatePortfolioSegment


Concentration
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value100.0100.0100.01.01.01.01.01.01.01.01.01.01.01.01.01.01.01.01.0
Percentage of ConcentrationRiskPercentage1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ahl:MortgageLoansNet, us-gaap:GeographicConcentrationRisk, us-gaap:CommercialRealEstatePortfolioSegment


Concentration
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value100.0100.0100.01.01.01.01.01.01.01.01.01.01.01.01.01.01.01.01.0
Percentage of ConcentrationRiskPercentage1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ahl:MortgageLoansNet, us-gaap:GeographicConcentrationRisk, us-gaap:ResidentialMortgage


Concentration
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-31
Value100.0100.0100.01.01.01.0
Percentage of ConcentrationRiskPercentage1100.0100.0100.0100.0100.0100.0

us-gaap:ConcentrationRiskPercentage1 us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType, us-gaap:FinancingReceivablePortfolioSegment

srt:ApartmentBuilding, ahl:MortgageLoansNet, ahl:PropertyTypeConcentrationRisk, us-gaap:CommercialRealEstatePortfolioSegment


Concentration
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value20.222.221.30.2140.2110.2040.180.1670.1160.1080.1020.0870.1
Percentage of ConcentrationRiskPercentage120.222.221.321.421.120.418.016.711.610.810.28.710.0

srt:Hotel, ahl:MortgageLoansNet, ahl:PropertyTypeConcentrationRisk, us-gaap:CommercialRealEstatePortfolioSegment


Concentration
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value10.410.711.30.1010.0960.1050.1060.1180.1340.1430.1340.1440.177
Percentage of ConcentrationRiskPercentage110.410.711.310.19.610.510.611.813.414.313.414.417.7

srt:IndustrialProperty, ahl:MortgageLoansNet, ahl:PropertyTypeConcentrationRisk, us-gaap:CommercialRealEstatePortfolioSegment


Concentration
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value14.614.411.90.1230.1270.1380.1420.1540.1580.1640.1250.1380.18
Percentage of ConcentrationRiskPercentage114.614.411.912.312.713.814.215.415.816.412.513.818.0

srt:OfficeBuilding, ahl:MortgageLoansNet, ahl:PropertyTypeConcentrationRisk, us-gaap:CommercialRealEstatePortfolioSegment


Concentration
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value30.830.531.40.3160.3120.2760.2760.3260.3240.3050.3250.2840.226
Percentage of ConcentrationRiskPercentage130.830.531.431.631.227.627.632.632.430.532.528.422.6

srt:OtherProperty, ahl:MortgageLoansNet, ahl:PropertyTypeConcentrationRisk, us-gaap:CommercialRealEstatePortfolioSegment


Concentration
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value8.15.45.90.0610.0630.0690.0720.0440.0370.0530.060.0730.084
Percentage of ConcentrationRiskPercentage18.15.45.96.16.36.97.24.43.75.36.07.38.4

srt:RetailSite, ahl:MortgageLoansNet, ahl:PropertyTypeConcentrationRisk, us-gaap:CommercialRealEstatePortfolioSegment


Concentration
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value15.916.818.20.1850.1910.2080.2240.1910.2310.2270.2540.2740.233
Percentage of ConcentrationRiskPercentage115.916.818.218.519.120.822.419.123.122.725.427.423.3

us-gaap:ConcentrationRiskPercentage1 us-gaap:StatementGeographical, us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType, us-gaap:FinancingReceivablePortfolioSegment

ahl:International, ahl:MortgageLoansNet, us-gaap:GeographicConcentrationRisk, us-gaap:CommercialRealEstatePortfolioSegment


Concentration
Period End2021-06-302021-03-312020-12-31
Value12.69.35.5
Percentage of ConcentrationRiskPercentage112.69.35.5

ahl:International, ahl:MortgageLoansNet, us-gaap:GeographicConcentrationRisk, us-gaap:ResidentialMortgage


Concentration
Period End2021-06-302021-03-312020-12-31
Value15.114.314.6
Percentage of ConcentrationRiskPercentage115.114.314.6

ahl:InternationalOther, ahl:MortgageLoansNet, us-gaap:GeographicConcentrationRisk, us-gaap:CommercialRealEstatePortfolioSegment


Concentration
Period End2021-06-302021-03-312020-12-31
Value6.43.55.5
Percentage of ConcentrationRiskPercentage16.43.55.5

ahl:InternationalOther, ahl:MortgageLoansNet, us-gaap:GeographicConcentrationRisk, us-gaap:ResidentialMortgage


Concentration
Period End2021-06-302021-03-312020-12-312020-06-302019-12-31
Value4.13.21.70.0020
Percentage of ConcentrationRiskPercentage14.13.21.70.20.0

ahl:OtherU.S.States, ahl:MortgageLoansNet, us-gaap:GeographicConcentrationRisk, us-gaap:ResidentialMortgage


Concentration
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-31
Value43.043.136.70.3550.4130.417
Percentage of ConcentrationRiskPercentage143.043.136.735.541.341.7

ahl:U.S.EastSouthCentral, ahl:MortgageLoansNet, us-gaap:GeographicConcentrationRisk, us-gaap:CommercialRealEstatePortfolioSegment


Concentration
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value3.23.33.50.0370.0380.0410.0450.0210.0260.040.0240.0260.027
Percentage of ConcentrationRiskPercentage13.23.33.53.73.84.14.52.12.64.02.42.62.7

ahl:U.S.MiddleAtlantic, ahl:MortgageLoansNet, us-gaap:GeographicConcentrationRisk, us-gaap:CommercialRealEstatePortfolioSegment


Concentration
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value24.125.826.80.2730.2660.2460.2250.1830.1840.1550.1550.1640.173
Percentage of ConcentrationRiskPercentage124.125.826.827.326.624.622.518.318.415.515.516.417.3

ahl:U.S.Mountain, ahl:MortgageLoansNet, us-gaap:GeographicConcentrationRisk, us-gaap:CommercialRealEstatePortfolioSegment


Concentration
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value3.53.94.20.0450.0460.050.0690.0830.0780.0840.0950.0820.094
Percentage of ConcentrationRiskPercentage13.53.94.24.54.65.06.98.37.88.49.58.29.4

ahl:U.S.NewEngland, ahl:MortgageLoansNet, us-gaap:GeographicConcentrationRisk, us-gaap:CommercialRealEstatePortfolioSegment


Concentration
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value2.73.03.10.030.030.0320.0360.0430.0480.0510.0490.0230.031
Percentage of ConcentrationRiskPercentage12.73.03.13.03.03.23.64.34.85.14.92.33.1

ahl:U.S.Pacific, ahl:MortgageLoansNet, us-gaap:GeographicConcentrationRisk, us-gaap:CommercialRealEstatePortfolioSegment


Concentration
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value23.323.424.00.230.2310.2380.2470.2240.230.2110.2330.2190.189
Percentage of ConcentrationRiskPercentage123.323.424.023.023.123.824.722.423.021.123.321.918.9

ahl:U.S.SouthAtlantic, ahl:MortgageLoansNet, us-gaap:GeographicConcentrationRisk, us-gaap:CommercialRealEstatePortfolioSegment


Concentration
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value14.515.015.50.1770.1790.1830.1730.2130.1950.2020.1840.2180.166
Percentage of ConcentrationRiskPercentage114.515.015.517.717.918.317.321.319.520.218.421.816.6

ahl:U.S.WestNorthCentral, ahl:MortgageLoansNet, us-gaap:GeographicConcentrationRisk, us-gaap:CommercialRealEstatePortfolioSegment


Concentration
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value1.01.11.30.0120.0130.0140.0180.0220.020.0240.0280.030.044
Percentage of ConcentrationRiskPercentage11.01.11.31.21.31.41.82.22.02.42.83.04.4

ahl:U.S.WestSouthCentral, ahl:MortgageLoansNet, us-gaap:GeographicConcentrationRisk, us-gaap:CommercialRealEstatePortfolioSegment


Concentration
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value4.95.45.60.0680.070.0750.0790.1010.110.1160.0980.090.125
Percentage of ConcentrationRiskPercentage14.95.45.66.87.07.57.910.111.011.69.89.012.5

ahl:U.SEastNorthCentral, ahl:MortgageLoansNet, us-gaap:GeographicConcentrationRisk, us-gaap:CommercialRealEstatePortfolioSegment


Concentration
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value10.29.810.50.1070.1080.0990.0990.110.1090.1170.1340.1480.123
Percentage of ConcentrationRiskPercentage110.29.810.510.710.89.99.911.010.911.713.414.812.3

country:GB, ahl:MortgageLoansNet, us-gaap:GeographicConcentrationRisk, us-gaap:CommercialRealEstatePortfolioSegment


Concentration
Period End2021-06-302021-03-31
Value6.25.8
Percentage of ConcentrationRiskPercentage16.25.8

country:IE, ahl:MortgageLoansNet, us-gaap:GeographicConcentrationRisk, us-gaap:ResidentialMortgage


Concentration
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-31
Value11.011.112.90.1190.1340.124
Percentage of ConcentrationRiskPercentage111.011.112.911.913.412.4

country:US, ahl:MortgageLoansNet, us-gaap:GeographicConcentrationRisk, us-gaap:CommercialRealEstatePortfolioSegment


Concentration
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value87.490.794.50.9790.9810.9780.9911.01.01.01.01.00.972
Percentage of ConcentrationRiskPercentage187.490.794.597.998.197.899.1100.0100.0100.0100.0100.097.2

country:US, ahl:MortgageLoansNet, us-gaap:GeographicConcentrationRisk, us-gaap:ResidentialMortgage


Concentration
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-31
Value84.985.785.40.8790.8660.876
Percentage of ConcentrationRiskPercentage184.985.785.487.986.687.6

stpr:CA, ahl:MortgageLoansNet, us-gaap:GeographicConcentrationRisk, us-gaap:ResidentialMortgage


Concentration
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-31
Value23.723.324.80.3650.2650.27
Percentage of ConcentrationRiskPercentage123.723.324.836.526.527.0

stpr:FL, ahl:MortgageLoansNet, us-gaap:GeographicConcentrationRisk, us-gaap:ResidentialMortgage


Concentration
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-31
Value11.912.613.30.1150.1350.127
Percentage of ConcentrationRiskPercentage111.912.613.311.513.512.7

stpr:NY, ahl:MortgageLoansNet, us-gaap:GeographicConcentrationRisk, us-gaap:ResidentialMortgage


Concentration
Period End2021-06-302021-03-312020-12-312020-06-302019-12-31
Value6.36.76.25.23.3
Percentage of ConcentrationRiskPercentage16.36.76.2520.0330.0

stpr:TX, ahl:MortgageLoansNet, us-gaap:GeographicConcentrationRisk, us-gaap:ResidentialMortgage


Concentration
Period End2020-12-312020-06-302020-03-312019-12-31
Value4.40.0440.0530.062
Percentage of ConcentrationRiskPercentage14.44.45.36.2

us-gaap:NonUs, ahl:MortgageLoansNet, us-gaap:GeographicConcentrationRisk, us-gaap:CommercialRealEstatePortfolioSegment


Concentration
Period End2020-12-312020-06-302020-03-312019-12-312019-09-302018-12-312018-09-302018-06-302017-12-31
Value5.50.0210.0190.0220.0090000.028
Percentage of ConcentrationRiskPercentage15.52.11.92.20.90.00.00.02.8

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value6.09.020153559
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded100.0100.0100.0100.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded us-gaap:BalanceSheetLocation

ahl:InvestmentsExcludingInvestmentsInRelatedParty


Debt
Period End2021-06-302021-03-312020-06-30
Value4.09.035
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded66.7100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded us-gaap:BalanceSheetLocation, us-gaap:FinancialInstrument

ahl:InvestmentsExcludingInvestmentsInRelatedParty, us-gaap:AssetBackedSecurities


Debt
Period End2021-06-302021-03-312020-06-302020-03-31
Value0.05.00.05.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded0.055.60.08.5

ahl:InvestmentsExcludingInvestmentsInRelatedParty, us-gaap:CollateralizedDebtObligations


Debt
Period End2021-06-302020-06-30
Value3.01.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded50.02.9

ahl:InvestmentsExcludingInvestmentsInRelatedParty, us-gaap:CommercialMortgageBackedSecurities


Debt
Period End2021-06-302021-03-312020-06-302020-03-31
Value0.02.05.04.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded0.022.214.36.8

ahl:InvestmentsExcludingInvestmentsInRelatedParty, us-gaap:CorporateDebtSecurities


Debt
Period End2021-06-302021-03-312020-06-302020-03-31
Value1.02.01615
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded16.722.245.725.4

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded us-gaap:FinancialInstrument

us-gaap:AssetBackedSecurities


Debt
Period End2020-09-302020-06-302020-03-31
Value0.00.05.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded0.00.08.5

us-gaap:CollateralizedDebtObligations


Debt
Period End2020-09-302020-06-30
Value0.01.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded0.02.9

us-gaap:CommercialMortgageBackedSecurities


Debt
Period End2020-09-302020-06-302020-03-31
Value125.04.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded80.014.36.8

us-gaap:CorporateDebtSecurities


Debt
Period End2020-09-302020-06-302020-03-31
Value1.01615
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded6.745.725.4

us-gaap:ResidentialMortgageBackedSecurities


Debt
Period End2020-09-302020-06-302020-03-31
Value2.01335
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded13.337.159.3

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded us-gaap:FinancialInstrument, us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:CollateralizedDebtObligations, srt:AffiliatedEntity


Debt
Period End2021-06-302020-12-312020-09-302020-06-30
Value2.00.01.01.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded33.30.06.72.9

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded us-gaap:InvestmentType

ahl:Investmentsincludingrelatedparty


Debt
Period End2020-09-302020-06-30
Value1636
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded106.7102.9

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded us-gaap:RelatedPartyTransactionsByRelatedParty

srt:AffiliatedEntity


Debt
Period End2020-09-30
Value1.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded6.7

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value-9000000.02000000.0-45000000.0-33000000.01000000.02000000.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal100.0100.0100.0100.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal us-gaap:BalanceSheetLocation

ahl:InvestmentsExcludingInvestmentsInRelatedParty


Debt
Period End2021-06-302021-03-312020-06-30
Value-9000000.02000000.01000000.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal100.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal us-gaap:BalanceSheetLocation, us-gaap:FinancialInstrument

ahl:InvestmentsExcludingInvestmentsInRelatedParty, us-gaap:AssetBackedSecurities


Debt
Period End2021-06-302020-06-30
Value-1000000.0-3000000.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal11.1-300.0

ahl:InvestmentsExcludingInvestmentsInRelatedParty, us-gaap:CollateralizedDebtObligations


Debt
Period End2021-06-302021-03-31
Value0-1000000.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal-0.0-50.0

ahl:InvestmentsExcludingInvestmentsInRelatedParty, us-gaap:CommercialMortgageBackedSecurities


Debt
Period End2021-06-302021-03-312020-06-30
Value-8000000.02000000.01000000.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal88.9100.0100.0

ahl:InvestmentsExcludingInvestmentsInRelatedParty, us-gaap:CorporateDebtSecurities


Debt
Period End2021-06-302021-03-31
Value-4000000.02000000.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal44.4100.0

ahl:InvestmentsExcludingInvestmentsInRelatedParty, us-gaap:ResidentialMortgageBackedSecurities


Debt
Period End2021-06-302021-03-312020-06-302020-03-31
Value4000000.0-1000000.03000000.02000000.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal-44.4-50.0300.0100.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal us-gaap:FinancialInstrument

us-gaap:AssetBackedSecurities


Debt
Period End2020-09-302020-06-302020-03-31
Value1000000.0-3000000.00
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal-3.0-300.00.0

us-gaap:CommercialMortgageBackedSecurities


Debt
Period End2020-09-302020-06-302020-03-31
Value-2000000.01000000.00
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal6.1100.00.0

us-gaap:ResidentialMortgageBackedSecurities


Debt
Period End2020-09-302020-06-302020-03-31
Value-32000000.03000000.02000000.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal97.0300.0100.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal us-gaap:FinancialInstrument, us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:CollateralizedDebtObligations, srt:AffiliatedEntity


Debt
Period End2020-09-302020-06-30
Value01000000.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal-0.0100.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal us-gaap:InvestmentType

ahl:Investmentsincludingrelatedparty


Debt
Period End2020-09-302020-06-30
Value-33000000.02000000.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal100.0200.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value4.02.05.00.0601.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease100.0100.0100.00.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease us-gaap:BalanceSheetLocation

ahl:InvestmentsExcludingInvestmentsInRelatedParty


Debt
Period End2021-06-302021-03-312020-06-30
Value4.02.060
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease100.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease us-gaap:BalanceSheetLocation, us-gaap:FinancialInstrument

ahl:InvestmentsExcludingInvestmentsInRelatedParty, us-gaap:ResidentialMortgageBackedSecurities


Debt
Period End2021-06-302021-03-312020-06-302020-03-31
Value4.02.0601.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease100.0100.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease us-gaap:FinancialInstrument

us-gaap:ResidentialMortgageBackedSecurities


Debt
Period End2020-09-302020-06-302020-03-31
Value0.0601.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease0.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease us-gaap:InvestmentType

ahl:Investmentsincludingrelatedparty


Debt
Period End2020-09-302020-06-30
Value0.060
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease0.0100.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value-3000000.0-6000000.0-16000000.0-15000000.0-1000000.0-1000000.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold100.0100.0100.0100.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold us-gaap:BalanceSheetLocation

ahl:InvestmentsExcludingInvestmentsInRelatedParty


Debt
Period End2021-06-302021-03-312020-06-30
Value-3000000.0-5000000.0-1000000.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold100.083.3100.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold us-gaap:BalanceSheetLocation, us-gaap:FinancialInstrument

ahl:InvestmentsExcludingInvestmentsInRelatedParty, us-gaap:CorporateDebtSecurities


Debt
Period End2021-06-302021-03-31
Value0-2000000.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold-0.033.3

ahl:InvestmentsExcludingInvestmentsInRelatedParty, us-gaap:ResidentialMortgageBackedSecurities


Debt
Period End2021-06-302021-03-312020-06-302020-03-31
Value-3000000.0-3000000.0-1000000.0-1000000.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold100.050.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold us-gaap:FinancialInstrument

us-gaap:CommercialMortgageBackedSecurities


Debt
Period End2020-09-302020-06-302020-03-31
Value-1000000.000
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold6.7-0.0-0.0

us-gaap:CorporateDebtSecurities


Debt
Period End2020-09-302020-06-302020-03-31
Value-2000000.000
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold13.3-0.0-0.0

us-gaap:ResidentialMortgageBackedSecurities


Debt
Period End2020-09-302020-06-302020-03-31
Value-12000000.0-1000000.0-1000000.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold80.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold us-gaap:FinancialInstrument, us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:CollateralizedDebtObligations, srt:AffiliatedEntity


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-30
Value0-1000000.00-1000000.00
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold-0.016.7-0.06.7-0.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold us-gaap:InvestmentType

ahl:Investmentsincludingrelatedparty


Debt
Period End2020-09-302020-06-30
Value-16000000.0-1000000.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold106.7100.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold us-gaap:RelatedPartyTransactionsByRelatedParty

srt:AffiliatedEntity


Debt
Period End2020-09-30
Value-1000000.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold6.7

us-gaap:DebtSecuritiesAvailableForSalePurchasedWithCreditDeteriorationAllowanceForCreditLossAtAcquisitionDate

us-gaap:DebtSecuritiesAvailableForSalePurchasedWithCreditDeteriorationAllowanceForCreditLossAtAcquisitionDate


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-30
Value4.02.05.00.060
Percentage of DebtSecuritiesAvailableForSalePurchasedWithCreditDeteriorationAllowanceForCreditLossAtAcquisitionDate100.0100.0100.00.0100.0

us-gaap:DebtSecuritiesAvailableForSalePurchasedWithCreditDeteriorationAmountAtParValue

us-gaap:DebtSecuritiesAvailableForSalePurchasedWithCreditDeteriorationAmountAtParValue


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-30
Value176.0220.0318
Percentage of DebtSecuritiesAvailableForSalePurchasedWithCreditDeteriorationAmountAtParValue100.0100.0100.00.0100.0

us-gaap:DebtSecuritiesAvailableForSalePurchasedWithCreditDeteriorationAmountAtPurchasePrice

us-gaap:DebtSecuritiesAvailableForSalePurchasedWithCreditDeteriorationAmountAtPurchasePrice


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-30
Value10.06.0150.0225
Percentage of DebtSecuritiesAvailableForSalePurchasedWithCreditDeteriorationAmountAtPurchasePrice100.0100.0100.00.0100.0

us-gaap:DebtSecuritiesAvailableForSalePurchasedWithCreditDeteriorationDiscountPremium

us-gaap:DebtSecuritiesAvailableForSalePurchasedWithCreditDeteriorationDiscountPremium


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-30
Value3.0-2.02.00.033
Percentage of DebtSecuritiesAvailableForSalePurchasedWithCreditDeteriorationDiscountPremium100.0100.0100.00.0100.0

us-gaap:DebtSecuritiesAvailableForSaleRealizedGain

us-gaap:DebtSecuritiesAvailableForSaleRealizedGain


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value208731781926816458475617
Percentage of DebtSecuritiesAvailableForSaleRealizedGain100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleRealizedGainLoss

us-gaap:DebtSecuritiesAvailableForSaleRealizedGainLoss


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value37-70.0141142.0304026524.0
Percentage of DebtSecuritiesAvailableForSaleRealizedGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleRealizedLoss

us-gaap:DebtSecuritiesAvailableForSaleRealizedLoss


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value171143371786613418214.013
Percentage of DebtSecuritiesAvailableForSaleRealizedLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtSecuritiesTradingGainLoss

us-gaap:DebtSecuritiesTradingGainLoss


Debt
Period End2021-06-302021-03-312020-06-302020-03-31
Value61-69.0191-223.0
Percentage of DebtSecuritiesTradingGainLoss100.0100.0100.0100.0

us-gaap:DebtSecuritiesTradingRealizedGainLoss

us-gaap:DebtSecuritiesTradingRealizedGainLoss


Debt
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value4124191-223.0-32.0487956
Percentage of DebtSecuritiesTradingRealizedGainLoss100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtSecuritiesTradingUnrealizedGainLoss

us-gaap:DebtSecuritiesTradingUnrealizedGainLoss


Debt
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value19135-73.0469871
Percentage of DebtSecuritiesTradingUnrealizedGainLoss100.0100.0100.0100.0100.0100.0

us-gaap:DebtSecuritiesTradingUnrealizedGainLoss us-gaap:BalanceSheetLocation

ahl:InvestmentsExcludingInvestmentsInRelatedParty


Debt
Period End2021-06-302021-03-312020-06-302020-03-31
Value66-121.0135-73.0
Percentage of DebtSecuritiesTradingUnrealizedGainLoss0.00.0100.0100.0

us-gaap:DebtSecuritiesTradingUnrealizedGainLoss us-gaap:ConsolidatedEntities

srt:ConsolidatedEntityExcludingVariableInterestEntitiesVIE


Debt
Period End2020-09-302020-06-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value19135-22.0469871-25.0-79.030-69.0321648
Percentage of DebtSecuritiesTradingUnrealizedGainLoss100.0100.00.0100.0100.0100.00.00.00.00.00.00.00.0

us-gaap:DebtSecuritiesTradingUnrealizedGainLoss us-gaap:ConsolidatedEntities, us-gaap:RelatedPartyTransactionsByRelatedParty

srt:ConsolidatedEntityExcludingVariableInterestEntitiesVIE, srt:AffiliatedEntity


Debt
Period End2020-09-302020-06-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value1.066-8.03.0-13.0-3.0-7.0-12.0-4.0-2.0-5.02.012
Percentage of DebtSecuritiesTradingUnrealizedGainLoss5.348.90.06.5-13.3-4.20.00.00.00.00.00.00.0

us-gaap:DebtSecuritiesTradingUnrealizedGainLoss us-gaap:RelatedPartyTransactionsByRelatedParty

srt:AffiliatedEntity


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-4.0585.01.066-109.0-7.04.0-13.0-2.0
Percentage of DebtSecuritiesTradingUnrealizedGainLoss0.00.00.05.348.9149.30.08.7-13.3-2.8

us-gaap:DeferredPolicyAcquisitionCostAmortizationExpenseAssumptionChange

us-gaap:DeferredPolicyAcquisitionCostAmortizationExpenseAssumptionChange


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value-72.0-234.00.00.00.0
Percentage of DeferredPolicyAcquisitionCostAmortizationExpenseAssumptionChange100.0100.00.00.00.0

us-gaap:DeferredPolicyAcquisitionCostAmortizationExpenseOther

us-gaap:DeferredPolicyAcquisitionCostAmortizationExpenseOther


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value20598239231380-436.0112165246226-43.0704437524439593440306.0
Percentage of DeferredPolicyAcquisitionCostAmortizationExpenseOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredPolicyAcquisitionCostUnrealizedInvestmentGainLoss

us-gaap:DeferredPolicyAcquisitionCostUnrealizedInvestmentGainLoss


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value186-271.0117116489-489.0-32.0158151149-26.0-26.0-48.0-52.010.0253827-43.038367.0
Percentage of DeferredPolicyAcquisitionCostUnrealizedInvestmentGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredPolicyAcquisitionCostsAdditions

us-gaap:DeferredPolicyAcquisitionCostsAdditions


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value144143163189169112124167181173690184148512212212314310515220414897
Percentage of DeferredPolicyAcquisitionCostsAdditions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredPolicyAcquisitionCostsAndPresentValueOfFutureProfitsAmortization1

us-gaap:DeferredPolicyAcquisitionCostsAndPresentValueOfFutureProfitsAmortization1


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value230164274299361-413.0143323261231
Percentage of DeferredPolicyAcquisitionCostsAndPresentValueOfFutureProfitsAmortization1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredSalesInducementCostAmortizationExpenseAssumptionChange

us-gaap:DeferredSalesInducementCostAmortizationExpenseAssumptionChange


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value-26.0-18.00.00.00.0
Percentage of DeferredSalesInducementCostAmortizationExpenseAssumptionChange100.0100.00.00.00.0

us-gaap:DeferredSalesInducementCostUnrealizedGainLossOnInvestment

us-gaap:DeferredSalesInducementCostUnrealizedGainLossOnInvestment


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value60-87.03541143-139.0-10.0434949-21.0-6.0-20.0-22.04.08.0
Percentage of DeferredSalesInducementCostUnrealizedGainLossOnInvestment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredSalesInducementsAdditions

us-gaap:DeferredSalesInducementsAdditions


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value61545441453839577060677774464041433755614737
Percentage of DeferredSalesInducementsAdditions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredSalesInducementsAmortizationExpense

us-gaap:DeferredSalesInducementsAmortizationExpense


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value22842948-21.010.04520135.0-12.03023202117
Percentage of DeferredSalesInducementsAmortizationExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeFairValueHedgeIncludedInEffectivenessGainLoss us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:DerivativeFairValueHedgeIncludedInEffectivenessGainLoss

us-gaap:ForeignExchangeForward, us-gaap:FairValueHedging


Derivative
Period End2020-09-302020-06-302019-09-302019-06-30
Value-2.0-3.02.0-7.0
Percentage of DerivativeFairValueHedgeIncludedInEffectivenessGainLoss100.0100.0100.0100.0

us-gaap:DerivativeFairValueHedgeIncludedInEffectivenessGainLoss us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation

us-gaap:CrossCurrencyInterestRateContract, us-gaap:FairValueHedging, us-gaap:DesignatedAsHedgingInstrument, ahl:InterestSensitiveContractBenefits


Derivative
Period End2021-06-30
Value1.0
Percentage of DerivativeFairValueHedgeIncludedInEffectivenessGainLoss0.0

us-gaap:CrossCurrencyInterestRateContract, us-gaap:FairValueHedging, us-gaap:DesignatedAsHedgingInstrument, us-gaap:GainLossOnInvestmentsMember1


Derivative
Period End2021-06-302021-03-31
Value-4.05.0
Percentage of DerivativeFairValueHedgeIncludedInEffectivenessGainLoss0.00.0

us-gaap:ForeignExchangeForward, us-gaap:FairValueHedging, us-gaap:DesignatedAsHedgingInstrument, us-gaap:GainLossOnInvestmentsMember1


Derivative
Period End2021-06-302021-03-312020-06-302020-03-31
Value161.0-3.04.0
Percentage of DerivativeFairValueHedgeIncludedInEffectivenessGainLoss0.00.0100.00.0

us-gaap:DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet

us-gaap:DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value1282-285.021151095796-1842.0344355543675-760.0538-8.0541801121042232889313-111.0
Percentage of DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet us-gaap:DerivativeInstrumentRisk, us-gaap:IncomeStatementLocation

us-gaap:EmbeddedDerivativeFinancialInstruments, ahl:InterestSensitiveContractBenefits


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-1183.0335-474.0-553.0-1534.01177-606.0-265.0-638.0-1017.01063-324.0-54.0238-681.0-344.0-302.0-431.079-243.0-132.0-19.0
Percentage of DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet-92.3-117.5-22.4-50.5-192.7-63.9-176.2-74.6-117.5-150.7-139.9-60.2675.0440.7-378.3-307.1-290.4-193.327.4-261.3-1015.417.1

us-gaap:EmbeddedDerivativeFinancialInstruments, us-gaap:GainLossOnInvestmentsMember1


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value1391-1133.0139110771629-1446.0185496735830-252.0101-49.0-32.07282123
Percentage of DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet108.5397.565.898.4204.678.553.8139.7135.4123.033.218.8612.5-59.340.073.2118.3

us-gaap:ForeignExchangeForward, us-gaap:GainLossOnInvestmentsMember1


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value-19.0-31.0-57.0-114.0-23.067-49.042-1.06.06.03.014-7.04.04.019
Percentage of DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet-1.510.9-2.7-10.4-2.9-3.6-14.211.8-0.20.9-0.80.6-175.0-13.02.23.618.3

us-gaap:Future, us-gaap:GainLossOnInvestmentsMember1


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value44116050-3.0164.0-3.0-3.0-11.05.01.01.0-5.0-5.0-5.0-4.0
Percentage of DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet3.4-3.92.84.6-0.4-0.91.2-0.8-0.6-1.6-0.70.2-12.5-9.3-2.8-4.5-3.8

us-gaap:StockOption, us-gaap:GainLossOnInvestmentsMember1


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value10445021122606672-1581.080477439849-1580.075689-142.0785367259
Percentage of DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet81.4-176.153.055.384.485.8233.721.780.8125.8207.9140.5-1112.5-263.0436.1327.7249.0

us-gaap:Swap, us-gaap:GainLossOnInvestmentsMember1


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value5.031732955-75.06.08.01118-2.01.0-9.02.05.08.09.0
Percentage of DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet0.4-10.93.52.66.94.11.72.32.02.70.30.2112.53.72.87.18.7

us-gaap:DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet us-gaap:IncomeStatementLocation

us-gaap:GainLossOnInvestmentsMember1


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value2465-620.0258916482330-3019.095062011811692-1823.086246-184.0861456406
Percentage of DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet192.3217.5122.4150.5292.7163.9276.2174.6217.5250.7239.9160.2-575.0-340.7478.3407.1390.4

us-gaap:DirectPremiumsEarned

us-gaap:DirectPremiumsEarned


Direct
Period End2020-12-312020-09-302020-06-302019-12-312019-09-302019-06-30
Value426742281442661765
Percentage of DirectPremiumsEarned100.0100.0100.0100.0100.0100.0

us-gaap:DividendsPreferredStock

us-gaap:DividendsPreferredStock


Dividends
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value3536283019181917
Percentage of DividendsPreferredStock100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DividendsPreferredStock us-gaap:StatementEquityComponents

us-gaap:Parent


Dividends
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value3536283019181917
Percentage of DividendsPreferredStock100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RetainedEarnings


Dividends
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value3536283019181917
Percentage of DividendsPreferredStock100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DividendsPreferredStockCash

us-gaap:DividendsPreferredStockCash


Dividends
Period End2020-09-302019-12-312019-09-30
Value301917
Percentage of DividendsPreferredStockCash100.0100.0100.0

us-gaap:DividendsPreferredStockCash us-gaap:StatementClassOfStock

us-gaap:SeriesAPreferredStock


Dividends
Period End2020-09-302020-06-302020-03-312019-12-312019-09-30
Value1414131417
Percentage of DividendsPreferredStockCash46.70.00.073.7100.0

us-gaap:SeriesBPreferredStock


Dividends
Period End2020-09-302020-06-302020-03-31
Value4.05.05.0
Percentage of DividendsPreferredStockCash13.30.00.0

us-gaap:SeriesCPreferredStock


Dividends
Period End2020-09-30
Value12
Percentage of DividendsPreferredStockCash40.0

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Effect
Period End2020-12-312020-09-302020-06-302020-03-312019-06-302019-03-31
Value2.0-7.01.0-22.00.00.0
Percentage of EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.00.00.0

us-gaap:EquitySecuritiesFvNiGainLoss

us-gaap:EquitySecuritiesFvNiGainLoss


Equity
Period End2021-06-302021-03-312020-06-302020-03-31
Value8.01730-50.0
Percentage of EquitySecuritiesFvNiGainLoss100.0100.0100.0100.0

us-gaap:EquitySecuritiesFvNiRealizedGainLoss

us-gaap:EquitySecuritiesFvNiRealizedGainLoss


Equity
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value1230-50.0-4.01.018
Percentage of EquitySecuritiesFvNiRealizedGainLoss100.0100.0100.0100.0100.0100.0

us-gaap:EquitySecuritiesFvNiUnrealizedGainLoss

us-gaap:EquitySecuritiesFvNiUnrealizedGainLoss


Equity
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value1117-37.00.02.018
Percentage of EquitySecuritiesFvNiUnrealizedGainLoss100.0100.0100.00.0100.0100.0

us-gaap:EquitySecuritiesFvNiUnrealizedGainLoss us-gaap:BalanceSheetLocation

ahl:InvestmentsExcludingInvestmentsInRelatedParty


Equity
Period End2021-06-302021-03-312020-06-302020-03-31
Value189.017-37.0
Percentage of EquitySecuritiesFvNiUnrealizedGainLoss0.00.0100.0100.0

us-gaap:EquitySecuritiesFvNiUnrealizedGainLoss us-gaap:ConsolidatedEntities

srt:ConsolidatedEntityExcludingVariableInterestEntitiesVIE


Equity
Period End2020-09-302020-06-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value1117-1.00.02.018-20.0-2.04.00.0172.0-2.0
Percentage of EquitySecuritiesFvNiUnrealizedGainLoss100.0100.00.00.0100.0100.00.00.00.00.00.00.00.0

us-gaap:EquitySecuritiesFvNiUnrealizedGainLoss us-gaap:RelatedPartyTransactionsByRelatedParty

srt:AffiliatedEntity


Equity
Period End2021-06-302021-03-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-5.06.00.00.0-16.00.0-5.03.0
Percentage of EquitySecuritiesFvNiUnrealizedGainLoss0.00.00.0-0.00.00.0-250.016.7

us-gaap:FairValueAssetRecurringBasisStillHeldUnrealizedGainLossOci

us-gaap:FairValueAssetRecurringBasisStillHeldUnrealizedGainLossOci


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-03-31
Value4.03984121224-356.00.0
Percentage of FairValueAssetRecurringBasisStillHeldUnrealizedGainLossOci100.0100.0100.0100.0100.0100.00.0

us-gaap:FairValueAssetRecurringBasisStillHeldUnrealizedGainLossOci us-gaap:BalanceSheetLocation, us-gaap:FinancialInstrument, us-gaap:InvestmentType

ahl:InvestmentsExcludingInvestmentsInRelatedParty, us-gaap:AssetBackedSecurities, us-gaap:AvailableforsaleSecurities


Fair
Period End2021-06-302021-03-312020-06-302020-03-31
Value-5.03510.0-103.0
Percentage of FairValueAssetRecurringBasisStillHeldUnrealizedGainLossOci-125.089.74.528.9

ahl:InvestmentsExcludingInvestmentsInRelatedParty, us-gaap:CommercialMortgageBackedSecurities, us-gaap:AvailableforsaleSecurities


Fair
Period End2021-06-302021-03-312020-06-302020-03-31
Value1.04.0-1.0-5.0
Percentage of FairValueAssetRecurringBasisStillHeldUnrealizedGainLossOci25.010.3-0.41.4

ahl:InvestmentsExcludingInvestmentsInRelatedParty, us-gaap:CorporateDebtSecurities, us-gaap:AvailableforsaleSecurities


Fair
Period End2021-06-302021-03-312020-06-302020-03-31
Value6.02141-31.0
Percentage of FairValueAssetRecurringBasisStillHeldUnrealizedGainLossOci150.053.818.38.7

us-gaap:FairValueAssetRecurringBasisStillHeldUnrealizedGainLossOci us-gaap:FinancialInstrument, us-gaap:InvestmentType

us-gaap:AssetBackedSecurities, ahl:DebtSecuritiesAvailableforsale


Fair
Period End2020-09-302020-06-302020-03-312019-03-31
Value1310.0-103.00.0
Percentage of FairValueAssetRecurringBasisStillHeldUnrealizedGainLossOci10.74.528.90.0

us-gaap:CollateralizedDebtObligations, ahl:DebtSecuritiesAvailableforsale


Fair
Period End2020-09-302020-06-302020-03-312019-03-31
Value2.02.0-9.00.0
Percentage of FairValueAssetRecurringBasisStillHeldUnrealizedGainLossOci1.70.92.50.0

us-gaap:CommercialMortgageBackedSecurities, ahl:DebtSecuritiesAvailableforsale


Fair
Period End2020-09-302020-06-302020-03-312019-03-31
Value5.0-1.0-5.00.0
Percentage of FairValueAssetRecurringBasisStillHeldUnrealizedGainLossOci4.1-0.41.40.0

us-gaap:CorporateDebtSecurities, ahl:DebtSecuritiesAvailableforsale


Fair
Period End2020-09-302020-06-302020-03-312019-03-31
Value7541-31.00.0
Percentage of FairValueAssetRecurringBasisStillHeldUnrealizedGainLossOci62.018.38.70.0

us-gaap:USStatesAndPoliticalSubdivisions, ahl:DebtSecuritiesAvailableforsale


Fair
Period End2020-09-302020-06-302020-03-31
Value-1.03.0-3.0
Percentage of FairValueAssetRecurringBasisStillHeldUnrealizedGainLossOci-0.81.30.8

us-gaap:FairValueAssetRecurringBasisStillHeldUnrealizedGainLossOci us-gaap:FinancialInstrument, us-gaap:InvestmentType, us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:AssetBackedSecurities, ahl:DebtSecuritiesAvailableforsale, srt:AffiliatedEntity


Fair
Period End2020-09-302020-06-302020-03-312019-03-31
Value25169-205.00.0
Percentage of FairValueAssetRecurringBasisStillHeldUnrealizedGainLossOci20.775.457.60.0

us-gaap:AssetBackedSecurities, us-gaap:AvailableforsaleSecurities, srt:AffiliatedEntity


Fair
Period End2021-06-302021-03-312020-06-302020-03-31
Value2.0-27.0169-205.0
Percentage of FairValueAssetRecurringBasisStillHeldUnrealizedGainLossOci50.0-69.275.457.6

us-gaap:CorporateDebtSecurities, ahl:DebtSecuritiesAvailableforsale, srt:AffiliatedEntity


Fair
Period End2020-09-30
Value2.0
Percentage of FairValueAssetRecurringBasisStillHeldUnrealizedGainLossOci1.7

us-gaap:CorporateDebtSecurities, us-gaap:AvailableforsaleSecurities, srt:AffiliatedEntity


Fair
Period End2021-03-31
Value6.0
Percentage of FairValueAssetRecurringBasisStillHeldUnrealizedGainLossOci15.4

us-gaap:FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss

us-gaap:FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value494121419557-434.09.03.0-6.0-3.0
Percentage of FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss

us-gaap:FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-06-302019-03-31
Value1000000.0-1000000.01000000.002000000.0000
Percentage of FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss100.0100.0100.00.0100.00.00.00.0

us-gaap:FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss us-gaap:FairValueByLiabilityClass

us-gaap:DerivativeFinancialInstrumentsLiabilities


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-06-302019-03-31
Value1000000.0-1000000.01000000.002000000.0000
Percentage of FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss100.0100.0100.00.0100.00.00.00.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1493-1811.09816502250-1904.0-196.0369649757
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value3.03284109224-390.0-20.0344826
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value2153163619091473549145913741386570829
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value8767701585126743810738541236396611
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value6376443951838137344939
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value121410228111193348383116126179
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements us-gaap:BalanceSheetLocation, us-gaap:FairValueByAssetClass

ahl:InvestmentsExcludingInvestmentsInRelatedParty, us-gaap:LoansReceivable


Fair
Period End2021-06-302021-03-312020-06-302020-03-31
Value0.01.01.01.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements0.01.01.10.3

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements us-gaap:BalanceSheetLocation, us-gaap:FinancialInstrument, us-gaap:InvestmentType

ahl:InvestmentsExcludingInvestmentsInRelatedParty, us-gaap:AssetBackedSecurities, us-gaap:AvailableforsaleSecurities


Fair
Period End2021-06-302021-03-312020-06-302020-03-31
Value8044540242
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements66.244.143.069.5

ahl:InvestmentsExcludingInvestmentsInRelatedParty, us-gaap:CollateralizedDebtObligations, us-gaap:AvailableforsaleSecurities


Fair
Period End2021-06-302021-03-312020-06-302020-03-31
Value8.0345.03.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements0.733.35.40.9

ahl:InvestmentsExcludingInvestmentsInRelatedParty, us-gaap:CommercialMortgageBackedSecurities, us-gaap:AvailableforsaleSecurities


Fair
Period End2021-06-30
Value1.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements0.1

ahl:InvestmentsExcludingInvestmentsInRelatedParty, us-gaap:CorporateDebtSecurities, us-gaap:AvailableforsaleSecurities


Fair
Period End2021-06-302021-03-312020-06-302020-03-31
Value508.03231
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements4.17.834.48.9

ahl:InvestmentsExcludingInvestmentsInRelatedParty, us-gaap:ForeignGovernmentDebtSecurities, us-gaap:AvailableforsaleSecurities


Fair
Period End2021-06-30
Value1.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements0.1

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements us-gaap:FairValueByAssetClass

us-gaap:LoansReceivable


Fair
Period End2020-09-302020-06-302020-03-312019-09-302019-06-30
Value6.01.01.04.01.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements5.41.10.33.40.8

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements us-gaap:FinancialInstrument, us-gaap:InvestmentType

us-gaap:AssetBackedSecurities, ahl:DebtSecuritiesAvailableforsale


Fair
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value4840242273599
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements43.243.069.523.327.855.3

us-gaap:CollateralizedDebtObligations, ahl:DebtSecuritiesAvailableforsale


Fair
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value1.05.03.03.00.00.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements0.95.40.92.60.00.0

us-gaap:CommercialMortgageBackedSecurities, ahl:DebtSecuritiesAvailableforsale


Fair
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value1.00.00.052326.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements0.90.00.044.825.43.4

us-gaap:CorporateDebtSecurities, ahl:DebtSecuritiesAvailableforsale


Fair
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value19323110.02772
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements17.134.48.98.621.440.2

us-gaap:ResidentialMortgageBackedSecurities, ahl:DebtSecuritiesAvailableforsale


Fair
Period End2020-09-302020-06-302020-03-312019-06-30
Value1.00.00.00.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements0.90.00.00.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements us-gaap:FinancialInstrument, us-gaap:InvestmentType, us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:AssetBackedSecurities, ahl:DebtSecuritiesAvailableforsale, srt:AffiliatedEntity


Fair
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value230.0550.08.01.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements20.70.015.80.06.30.6

us-gaap:AssetBackedSecurities, ahl:DebtSecuritiesTrading, srt:AffiliatedEntity


Fair
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value780.00.0140.023-2.017
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements6.40.00.015.10.06.0-1.713.5

us-gaap:AssetBackedSecurities, us-gaap:AvailableforsaleSecurities, srt:AffiliatedEntity


Fair
Period End2021-06-302021-03-312020-06-302020-03-31
Value2667.0-1.055
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements21.96.9-1.115.8

us-gaap:CollateralizedDebtObligations, ahl:DebtSecuritiesTrading, srt:AffiliatedEntity


Fair
Period End2021-06-302021-03-312020-06-302020-03-312019-06-302019-03-31
Value4.06.00.00.00.00.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements0.35.90.00.00.00.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements us-gaap:InvestmentType

us-gaap:ShortTermInvestments


Fair
Period End2020-09-302020-06-302020-03-312019-09-302019-06-30
Value10.00.014193.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements9.00.04.016.42.4

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements us-gaap:InvestmentType, us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:EquitySecurities, srt:AffiliatedEntity


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-06-302019-03-31
Value2.01.01.03.01.02.00.00.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements0.21.00.42.71.10.60.00.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value225258-147.0462192667-76.011416182
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-127.0-124.0-316.033-450.0248-92.0-339.0-707.0-196.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet us-gaap:BalanceSheetLocation, us-gaap:FairValueByAssetClass

ahl:InvestmentsExcludingInvestmentsInRelatedParty, us-gaap:ShortTermInvestments


Fair
Period End2021-06-302021-03-312020-06-30
Value0.0-2.0-5.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet-0.01.61.1

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet us-gaap:BalanceSheetLocation, us-gaap:FinancialInstrument, us-gaap:InvestmentType

ahl:InvestmentsExcludingInvestmentsInRelatedParty, us-gaap:AssetBackedSecurities, ahl:DebtSecuritiesTrading


Fair
Period End2021-06-30
Value3.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet-2.4

ahl:InvestmentsExcludingInvestmentsInRelatedParty, us-gaap:AssetBackedSecurities, us-gaap:AvailableforsaleSecurities


Fair
Period End2021-06-302021-03-312020-06-302020-03-31
Value-41.0-91.0-20.0-177.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet32.373.44.4-71.4

ahl:InvestmentsExcludingInvestmentsInRelatedParty, us-gaap:CorporateDebtSecurities, us-gaap:AvailableforsaleSecurities


Fair
Period End2021-06-302021-03-312020-06-302020-03-31
Value117-43.0-368.0513
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet-92.134.781.8206.9

ahl:InvestmentsExcludingInvestmentsInRelatedParty, us-gaap:ResidentialMortgageBackedSecurities, ahl:DebtSecuritiesTrading


Fair
Period End2021-06-302021-03-312020-06-302020-03-31
Value2.017-17.019
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet-1.6-13.73.87.7

ahl:InvestmentsExcludingInvestmentsInRelatedParty, us-gaap:USStatesAndPoliticalSubdivisions, us-gaap:AvailableforsaleSecurities


Fair
Period End2021-06-302021-03-31
Value2.0-34.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet-1.627.4

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet us-gaap:BalanceSheetLocation, us-gaap:InvestmentType

ahl:InvestmentsExcludingInvestmentsInRelatedParty, ahl:InvestmentFunds


Fair
Period End2021-06-302021-03-31
Value0.0109
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet-0.0-87.9

ahl:InvestmentsExcludingInvestmentsInRelatedParty, us-gaap:ShortTermInvestments


Fair
Period End2021-06-302021-03-312020-06-30
Value0.0-2.0-5.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet-0.01.61.1

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet us-gaap:FairValueByAssetClass

us-gaap:ShortTermInvestments


Fair
Period End2020-09-302020-06-302020-03-312019-06-30
Value-88.0-5.00.00.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet-266.71.10.0-0.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet us-gaap:FinancialInstrument, us-gaap:InvestmentType

us-gaap:AssetBackedSecurities, ahl:DebtSecuritiesAvailableforsale


Fair
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value147-20.0-177.0-137.0-359.0-77.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet445.54.4-71.440.450.839.3

us-gaap:CollateralizedDebtObligations, ahl:DebtSecuritiesAvailableforsale


Fair
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value36-3.0-20.0-104.0-32.0-29.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet109.10.7-8.130.74.514.8

us-gaap:CommercialMortgageBackedSecurities, ahl:DebtSecuritiesAvailableforsale


Fair
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value16140.0-73.0-8.0-9.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet48.5-3.10.021.51.14.6

us-gaap:CorporateDebtSecurities, ahl:DebtSecuritiesAvailableforsale


Fair
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value-49.0-368.0513-70.0-261.0-31.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet-148.581.8206.920.636.915.8

us-gaap:CorporateDebtSecurities, ahl:DebtSecuritiesTrading


Fair
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value0.0-30.032-6.0-5.010.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet0.06.712.91.80.7-5.1

us-gaap:ResidentialMortgageBackedSecurities, ahl:DebtSecuritiesAvailableforsale


Fair
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value-16.0-29.042-2.0-60.00.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet-48.56.416.90.68.5-0.0

us-gaap:ResidentialMortgageBackedSecurities, ahl:DebtSecuritiesTrading


Fair
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value7.0-17.01935-38.0-45.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet21.23.87.7-10.35.423.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet us-gaap:FinancialInstrument, us-gaap:InvestmentType, us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:AssetBackedSecurities, ahl:DebtSecuritiesAvailableforsale, srt:AffiliatedEntity


Fair
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value-3.00.0-164.00.0-103.00.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet-9.1-0.0-66.1-0.014.6-0.0

us-gaap:AssetBackedSecurities, us-gaap:AvailableforsaleSecurities, srt:AffiliatedEntity


Fair
Period End2021-06-302021-03-312020-06-302020-03-31
Value0.0-61.02.0-164.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet-0.049.2-0.4-66.1

us-gaap:CollateralizedDebtObligations, ahl:DebtSecuritiesTrading, srt:AffiliatedEntity


Fair
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-7.0-19.0-20.08.09.0-27.0-23.055-22.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet5.515.3-60.6-1.83.629.36.8-7.811.2

us-gaap:CorporateDebtSecurities, us-gaap:AvailableforsaleSecurities, srt:AffiliatedEntity


Fair
Period End2021-06-30
Value-201.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet158.3

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet us-gaap:InvestmentType

us-gaap:ShortTermInvestments


Fair
Period End2020-09-302020-06-302020-03-312019-06-30
Value-88.0-5.00.00.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet-266.71.10.0-0.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet us-gaap:InvestmentType, us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:EquitySecurities, srt:AffiliatedEntity


Fair
Period End2020-12-312020-09-302020-06-302020-03-312019-06-302019-03-31
Value1.00.00.0-6.00.00.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet-0.30.0-0.0-2.4-0.0-0.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value35238216942964241916453868278
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-1302.0656-440.0-613.0-1608.0943-445.0-421.0-788.0-1117.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByLiabilityClass

us-gaap:EmbeddedDerivativeFinancialInstruments, ahl:InterestSensitiveContracts


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-1183.0335-474.0-553.0-1534.01177-606.0-265.0-638.0-1017.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings90.951.1107.790.295.4124.8136.262.981.091.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings us-gaap:FairValueByLiabilityClass

us-gaap:DerivativeFinancialInstrumentsLiabilities


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-06-302019-03-31
Value1.0-1.01.00.02.0-4.00.00.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings-0.1-0.2-0.2-0.0-0.1-0.4-0.0-0.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings us-gaap:ProductOrService, us-gaap:FairValueByLiabilityClass

ahl:AmerUsClosedBlock, ahl:FuturePolicyBenefits


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-54.0103-23.0-4.0-92.06526-37.0-52.0-40.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings4.115.75.20.75.76.9-5.88.86.63.6

ahl:IndianapolisLifeInsuranceCompanyClosedBlock, ahl:FuturePolicyBenefits


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value14191.0-16.017-23.042-28.0-26.0-13.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings-1.12.9-0.22.6-1.1-2.4-9.46.73.31.2

us-gaap:UniversalLife, ahl:InterestSensitiveContracts


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-80.020055-40.0-1.0-272.092-91.0-72.0-47.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings6.130.5-12.56.50.1-28.8-20.721.69.14.2

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value197175224202646116181222301233
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByLiabilityClass

us-gaap:EmbeddedDerivativeFinancialInstruments, ahl:InterestSensitiveContracts


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value197175224202646116181222301233
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchasesSalesIssuancesSettlements

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchasesSalesIssuancesSettlements


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-21.0-65.065848517-676.063103161120
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchasesSalesIssuancesSettlements100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchasesSalesIssuancesSettlements us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByLiabilityClass

us-gaap:EmbeddedDerivativeFinancialInstruments, ahl:InterestSensitiveContracts


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-21.0-65.065848517-676.063103161120
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchasesSalesIssuancesSettlements100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-218.0240-434.0154129792118119140113
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByLiabilityClass

us-gaap:EmbeddedDerivativeFinancialInstruments, ahl:InterestSensitiveContracts


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-218.0240-434.0154129792118119140113
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueOptionChangesInFairValueGainLoss1

us-gaap:FairValueOptionChangesInFairValueGainLoss1


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value502-26.0204-37.0565-458.0-5.014316.06.0-18.0-15.0-9.0208.03213-20.03.02.0-38.0
Percentage of FairValueOptionChangesInFairValueGainLoss1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueOptionChangesInFairValueGainLoss1 us-gaap:FinancialInstrument, us-gaap:IncomeStatementLocation

ahl:DebtSecuritiesTrading, us-gaap:GainLossOnInvestmentsMember1


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value61-69.04124191-223.0-24.0487850-47.0-43.0-76.0-89.05.0-2.041
Percentage of FairValueOptionChangesInFairValueGainLoss112.2265.420.1-64.933.848.7480.0342.9251.6833.3-783.3238.9506.7988.925.0-25.0128.1

ahl:InvestmentFunds, us-gaap:InvestmentIncome


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value495-60.0186-57.0466-300.0-6.03.04.0-4.0274.010.02.0165.07.0
Percentage of FairValueOptionChangesInFairValueGainLoss198.6230.891.2154.182.565.5120.021.412.9-66.7450.0-22.2-66.7-22.280.062.521.9

us-gaap:InsuranceContractRightsAndObligationsFairValueOption, ahl:FuturePolicyBenefits


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value-54.0103-23.0-4.0-92.06526-37.0-52.0-40.026215184-9.05.0-19.0
Percentage of FairValueOptionChangesInFairValueGainLoss1-10.8-396.2-11.310.8-16.3-14.2-520.0-264.3-167.7-666.7433.3-116.7-340.0-933.3-45.062.5-59.4

us-gaap:FinancingReceivableAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease

us-gaap:FinancingReceivableAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease


Financing
Period End2021-06-302021-03-31
Value06000000.0
Percentage of FinancingReceivableAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease0.0100.0

us-gaap:FinancingReceivableAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease us-gaap:FinancingReceivablePortfolioSegment

us-gaap:ResidentialMortgage


Financing
Period End2021-06-302021-03-312020-12-312020-09-30
Value06000000.04000000.03000000.0
Percentage of FinancingReceivableAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease0.0100.00.00.0

us-gaap:FinancingReceivableAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease us-gaap:InvestmentType

ahl:Investmentsincludingrelatedparty


Financing
Period End2020-09-30
Value3000000.0
Percentage of FinancingReceivableAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease0.0

us-gaap:FinancingReceivableAllowanceForCreditLossesWriteOffs

us-gaap:FinancingReceivableAllowanceForCreditLossesWriteOffs


Financing
Period End2021-06-302020-12-312020-09-302020-06-30
Value1000000.0001000000.0
Percentage of FinancingReceivableAllowanceForCreditLossesWriteOffs100.00.00.0100.0

us-gaap:FinancingReceivableAllowanceForCreditLossesWriteOffs us-gaap:FinancingReceivablePortfolioSegment

us-gaap:ResidentialMortgage


Financing
Period End2021-06-302020-12-312020-09-302020-06-30
Value1000000.0001000000.0
Percentage of FinancingReceivableAllowanceForCreditLossesWriteOffs100.00.00.0100.0

us-gaap:FinancingReceivableNonaccrualInterestIncome us-gaap:FinancingReceivablePortfolioSegment

us-gaap:FinancingReceivableNonaccrualInterestIncome

us-gaap:ResidentialMortgage


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value2000000.02000000.02000000.02000000.001000000.0
Percentage of FinancingReceivableNonaccrualInterestIncome100.0100.0100.0100.00.0100.0

us-gaap:FinancingReceivablePurchasedWithCreditDeteriorationAllowanceForCreditLossAtAcquisitionDate us-gaap:InvestmentType

us-gaap:FinancingReceivablePurchasedWithCreditDeteriorationAllowanceForCreditLossAtAcquisitionDate

us-gaap:Mortgages


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-30
Value06000000.04000000.03000000.00
Percentage of FinancingReceivablePurchasedWithCreditDeteriorationAllowanceForCreditLossAtAcquisitionDate0.0100.0100.0100.00.0

us-gaap:FinancingReceivablePurchasedWithCreditDeteriorationAmountAtParValue us-gaap:InvestmentType

us-gaap:FinancingReceivablePurchasedWithCreditDeteriorationAmountAtParValue

us-gaap:Mortgages


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-30
Value0.03153731450.0
Percentage of FinancingReceivablePurchasedWithCreditDeteriorationAmountAtParValue0.0100.0100.0100.00.0

us-gaap:FinancingReceivablePurchasedWithCreditDeteriorationAmountAtPurchasePrice us-gaap:InvestmentType

us-gaap:FinancingReceivablePurchasedWithCreditDeteriorationAmountAtPurchasePrice

us-gaap:Mortgages


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-30
Value0.03353821420.0
Percentage of FinancingReceivablePurchasedWithCreditDeteriorationAmountAtPurchasePrice0.0100.0100.0100.00.0

us-gaap:FinancingReceivablePurchasedWithCreditDeteriorationDiscountPremium us-gaap:InvestmentType

us-gaap:FinancingReceivablePurchasedWithCreditDeteriorationDiscountPremium

us-gaap:Mortgages


Financing
Period End2021-06-302021-03-312020-06-30
Value0-26000000.00
Percentage of FinancingReceivablePurchasedWithCreditDeteriorationDiscountPremium0.0100.00.0

us-gaap:ForeignCurrencyCashFlowHedgeGainLossReclassifiedToEarningsNet us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation

us-gaap:ForeignCurrencyCashFlowHedgeGainLossReclassifiedToEarningsNet

us-gaap:CurrencySwap, us-gaap:CashFlowHedging, us-gaap:DesignatedAsHedgingInstrument


Foreign
Period End2021-06-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value270.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of ForeignCurrencyCashFlowHedgeGainLossReclassifiedToEarningsNet100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:GainLossOnDerivativeInstrumentsNetPretax

us-gaap:GainLossOnDerivativeInstrumentsNetPretax


Gain
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value2484-438.0247116482330-3019.095062011811692
Percentage of GainLossOnDerivativeInstrumentsNetPretax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GainLossOnDerivativeInstrumentsNetPretax us-gaap:ConsolidationItems

us-gaap:MaterialReconcilingItems


Gain
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value10924931148637754-1671.085684466940-1843.088497-158.080937926653622420018-118.0
Percentage of GainLossOnDerivativeInstrumentsNetPretax44.0-112.646.538.732.455.390.113.539.555.60.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments

us-gaap:GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments


Gain
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value17972548-3572.066513131776
Percentage of GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments100.0100.0100.0100.0100.0100.0

us-gaap:GainLossOnSaleOfInvestments us-gaap:CounterpartyName, us-gaap:FairValueByAssetClass, us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:GainLossOnSaleOfInvestments

ahl:AmeriHome, ahl:InvestmentFunds, srt:AffiliatedEntity


Gain
Period End2021-06-302021-03-31
Value8.0174
Percentage of GainLossOnSaleOfInvestments100.0100.0

us-gaap:GainLossOnSaleOfInvestments us-gaap:CounterpartyName, us-gaap:FairValueByAssetClass, us-gaap:RelatedPartyTransactionsByRelatedParty, us-gaap:SubsequentEventType

ahl:AmeriHome, ahl:InvestmentFunds, srt:AffiliatedEntity, us-gaap:SubsequentEvent


Gain
Period End2021-06-30
Value184
Percentage of GainLossOnSaleOfInvestments2300.0

us-gaap:GainLossOnSaleOfOtherInvestments

us-gaap:GainLossOnSaleOfOtherInvestments


Gain
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.080-43.0150.0-26.0-3.0-25.00.06.0
Percentage of GainLossOnSaleOfOtherInvestments0.0100.0100.0100.00.0100.0100.0100.00.0100.0

us-gaap:GainOnSaleOfInvestments us-gaap:CounterpartyName, us-gaap:InvestmentType, us-gaap:RelatedPartyTransactionsByRelatedParty, us-gaap:SubsequentEventType

us-gaap:GainOnSaleOfInvestments

ahl:AmeriHome, ahl:DifferentiatedInvestments, srt:AffiliatedEntity, us-gaap:SubsequentEvent


Gain
Period End2021-02-16
Value175
Percentage of GainOnSaleOfInvestments100.0

us-gaap:GrossInvestmentIncomeOperating

us-gaap:GrossInvestmentIncomeOperating


Gross
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value218018521729132314628751358121912771177
Percentage of GrossInvestmentIncomeOperating100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GrossInvestmentIncomeOperating us-gaap:ConsolidatedEntities

srt:ConsolidatedEntityExcludingVariableInterestEntitiesVIE


Gross
Period End2020-09-302020-06-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value132314621341119912561161121511591046939930905900
Percentage of GrossInvestmentIncomeOperating100.0100.098.798.498.498.60.00.00.00.00.00.00.0

us-gaap:GrossInvestmentIncomeOperating us-gaap:ConsolidatedEntities, us-gaap:InvestmentType

srt:ConsolidatedEntityExcludingVariableInterestEntitiesVIE, ahl:DebtSecuritiesAvailableforsale


Gross
Period End2020-09-302020-06-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value776790812760763753738730719668678646635
Percentage of GrossInvestmentIncomeOperating58.754.059.862.359.764.00.00.00.00.00.00.00.0

srt:ConsolidatedEntityExcludingVariableInterestEntitiesVIE, ahl:DebtSecuritiesTrading


Gross
Period End2020-09-302020-06-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value47425048494250525444484953
Percentage of GrossInvestmentIncomeOperating3.62.93.73.93.83.60.00.00.00.00.00.00.0

srt:ConsolidatedEntityExcludingVariableInterestEntitiesVIE, ahl:FundsWithheldatInterest


Gross
Period End2020-09-302020-06-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value81431241061341631911698646433534
Percentage of GrossInvestmentIncomeOperating6.12.99.18.710.513.80.00.00.00.00.00.00.0

srt:ConsolidatedEntityExcludingVariableInterestEntitiesVIE, ahl:InvestmentFunds


Gross
Period End2020-09-302020-06-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value1483721207610210.052565865365565
Percentage of GrossInvestmentIncomeOperating11.225.48.86.28.00.80.00.00.00.00.00.00.0

srt:ConsolidatedEntityExcludingVariableInterestEntitiesVIE, us-gaap:EquitySecurities


Gross
Period End2020-09-302020-06-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value4.02.05.04.04.03.04.04.02.02.05.04.02.0
Percentage of GrossInvestmentIncomeOperating0.30.10.40.30.30.30.00.00.00.00.00.00.0

srt:ConsolidatedEntityExcludingVariableInterestEntitiesVIE, us-gaap:Mortgages


Gross
Period End2020-09-302020-06-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value18417518717315915114212010491989890
Percentage of GrossInvestmentIncomeOperating13.912.013.814.212.512.80.00.00.00.00.00.00.0

srt:ConsolidatedEntityExcludingVariableInterestEntitiesVIE, us-gaap:OtherInvestments


Gross
Period End2020-09-302020-06-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value83384332453938282323221821
Percentage of GrossInvestmentIncomeOperating6.32.63.22.63.53.30.00.00.00.00.00.00.0

us-gaap:GrossInvestmentIncomeOperating us-gaap:InvestmentType

ahl:DebtSecuritiesAvailableforsale


Gross
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value776790837760763753
Percentage of GrossInvestmentIncomeOperating58.754.095.762.359.764.0

ahl:DebtSecuritiesTrading


Gross
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value60635547424850484942
Percentage of GrossInvestmentIncomeOperating2.83.43.23.62.95.53.73.93.83.6

ahl:FundsWithheldatInterest


Gross
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value172206104814341124106134163
Percentage of GrossInvestmentIncomeOperating7.911.16.06.12.94.79.18.710.513.8

ahl:InvestmentFunds


Gross
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value708463479148372-278.01379612326
Percentage of GrossInvestmentIncomeOperating32.525.027.711.225.4-31.810.17.99.62.2

us-gaap:AvailableforsaleSecurities


Gross
Period End2021-06-302021-03-312020-06-302020-03-31
Value939860790837
Percentage of GrossInvestmentIncomeOperating43.146.454.095.7

us-gaap:EquitySecurities


Gross
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value3.04.04.04.02.04.05.04.04.03.0
Percentage of GrossInvestmentIncomeOperating0.10.20.20.30.10.50.40.30.30.3

us-gaap:Mortgages


Gross
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value203192197184175186187173159151
Percentage of GrossInvestmentIncomeOperating9.310.411.413.912.021.313.814.212.512.8

us-gaap:OtherInvestments


Gross
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value95646883383743324539
Percentage of GrossInvestmentIncomeOperating4.43.53.96.32.64.23.22.63.53.3

us-gaap:GrossInvestmentIncomeOperating us-gaap:RelatedPartyTransactionsByRelatedParty

srt:AffiliatedEntity


Gross
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value586239490-214.0251175154199
Percentage of GrossInvestmentIncomeOperating33.918.133.5-24.518.514.412.116.9

us-gaap:IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions

us-gaap:IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value58538130589344-343.0734772-25.0
Percentage of IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions us-gaap:ConsolidatedEntities

us-gaap:VariableInterestEntityPrimaryBeneficiary


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value71-56.05.0195.00.00.00.0
Percentage of IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions12.1-14.71.621.31.5-0.00.00.0

us-gaap:IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions us-gaap:RelatedPartyTransactionsByRelatedParty

srt:AffiliatedEntity


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value51741629160374-362.0764370-18.0
Percentage of IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions88.4109.295.467.4108.7105.5104.191.597.272.0

us-gaap:IncreaseDecreaseInAccruedInvestmentIncomeReceivable

us-gaap:IncreaseDecreaseInAccruedInvestmentIncomeReceivable


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value4263103-2.034-5.029237.069
Percentage of IncreaseDecreaseInAccruedInvestmentIncomeReceivable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccruedInvestmentIncomeReceivable us-gaap:RelatedPartyTransactionsByRelatedParty

srt:AffiliatedEntity


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-3.023-5.0-8.010.016-1.06.00.0-3.0
Percentage of IncreaseDecreaseInAccruedInvestmentIncomeReceivable-7.136.5-4.9400.029.4-320.0-3.426.10.0-4.3

us-gaap:IncreaseDecreaseInFundsHeldUnderReinsuranceAgreements

us-gaap:IncreaseDecreaseInFundsHeldUnderReinsuranceAgreements


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1354-1252.0138512311051-1426.0946028751011
Percentage of IncreaseDecreaseInFundsHeldUnderReinsuranceAgreements100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInFundsHeldUnderReinsuranceAgreements us-gaap:RelatedPartyTransactionsByRelatedParty

srt:AffiliatedEntity


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value340-153.0258319747-422.056308453500
Percentage of IncreaseDecreaseInFundsHeldUnderReinsuranceAgreements25.112.218.625.971.129.659.651.251.849.5

us-gaap:IncreaseDecreaseInInsuranceLiabilities

us-gaap:IncreaseDecreaseInInsuranceLiabilities


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value29712502908299-147.018619852268653
Percentage of IncreaseDecreaseInInsuranceLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInInsuranceLiabilities us-gaap:RelatedPartyTransactionsByRelatedParty

srt:AffiliatedEntity


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value82598269815972616795
Percentage of IncreaseDecreaseInInsuranceLiabilities27.64.72.823.1-55.131.736.4117.325.014.5

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements us-gaap:StatementClassOfStock

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:CommonClassA


Incremental
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value6700000.05500000.0600000.04000000.03000000.000400000.0300000.0400000.090739.0529380.0369960.0258200.025743.0372360.02706800.03051400.01351200.0107480.085482.052832.0
Percentage of IncrementalCommonSharesAttributableToShareBasedPaymentArrangements100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentIncomeInvestmentExpense

us-gaap:InvestmentIncomeInvestmentExpense


Investment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1421481341141261301161299595
Percentage of InvestmentIncomeInvestmentExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentIncomeInvestmentExpense us-gaap:ConsolidatedEntities

srt:ConsolidatedEntityExcludingVariableInterestEntitiesVIE


Investment
Period End2020-09-302020-06-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value114126116129959594898884888579
Percentage of InvestmentIncomeInvestmentExpense100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.0

us-gaap:InvestmentIncomeInvestmentExpense us-gaap:RelatedPartyTransactionsByRelatedParty

srt:AffiliatedEntity


Investment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1401441281111231281131279492
Percentage of InvestmentIncomeInvestmentExpense98.697.395.597.497.698.597.498.498.996.8

us-gaap:LossContingencyDamagesSoughtValue us-gaap:LitigationCase, us-gaap:LitigationStatus

us-gaap:LossContingencyDamagesSoughtValue

ahl:Caldera, us-gaap:PendingLitigation


Loss
Period End2020-12-31
Value0.0
Percentage of LossContingencyDamagesSoughtValue0.0

us-gaap:MinorityInterestPeriodIncreaseDecrease

us-gaap:MinorityInterestPeriodIncreaseDecrease


Minority
Period End2021-06-302021-03-312017-12-312017-09-302017-06-302017-03-31
Value22400.00.00.0-1.0
Percentage of MinorityInterestPeriodIncreaseDecrease100.0100.00.00.00.0100.0

us-gaap:MinorityInterestPeriodIncreaseDecrease us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest


Minority
Period End2021-06-302021-03-312017-12-312017-09-302017-06-302017-03-31
Value22400.00.00.0-1.0
Percentage of MinorityInterestPeriodIncreaseDecrease100.0100.00.00.00.0100.0

us-gaap:NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance

us-gaap:NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance


Noncontrolling
Period End2021-06-302021-03-312020-06-302020-03-312019-10-01
Value852350.0240575
Percentage of NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance100.0100.00.0100.0100.0

us-gaap:NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest


Noncontrolling
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-10-01
Value852350.00.00.0240754
Percentage of NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance100.0100.00.00.00.0100.0131.1

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value1692-2591.0164810434506-4839.0-40.074412621478-762.0-103.0-667.0-910.097171582419-827.0499903303
Percentage of OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1798-2630.014519404411-4273.0-30.086313401464
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax us-gaap:StatementEquityComponents

ahl:AccumulatedForeignCurrencyAdjustmentandOtherIncludingPortionAttributabletoNoncontrollingInterest


Other
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1.09.010.0-10.09.03.0-1.0-1.00.0
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax