AGO


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

Table of contents



us-gaap:CommonStockValue

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:BenefitsLossesAndExpenses
us-gaap:ConsolidationItems

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

us-gaap:DeferredPolicyAcquisitionCostAmortizationExpense
dei:LegalEntity, us-gaap:StatementScenario
us-gaap:GainsLossesOnExtinguishmentOfDebt

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass
us-gaap:StatutoryAccountingPracticesByJurisdiction

us-gaap:IncomeTaxExpenseBenefit
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:InterestExpense
us-gaap:ConsolidationItems

us-gaap:InterestPaidNet

us-gaap:NetIncomeLoss
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass
us-gaap:ConsolidationItems

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic

us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted

us-gaap:NetInvestmentIncome
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OtherComprehensiveIncomeLossNetOfTax
us-gaap:StatementEquityComponents

us-gaap:OtherIncome
us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass
us-gaap:OtherNonoperatingIncomeExpense

us-gaap:PolicyholderBenefitsAndClaimsIncurredNet

us-gaap:PremiumsEarnedNet
us-gaap:ConsolidatedEntities

us-gaap:ProfitLoss
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass

us-gaap:RealizedInvestmentGainsLosses
us-gaap:ConsolidationItems
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ProductOrService

us-gaap:Revenues
us-gaap:ConsolidationItems
us-gaap:StatutoryAccountingPracticesByJurisdiction

us-gaap:Assets
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:BalanceSheetLocation, us-gaap:FairValueByAssetClass
us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass
us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass, us-gaap:RecourseStatus
us-gaap:ConsolidatedEntities, us-gaap:MortgageLoansOnRealEstateDescriptionLoanCategory, us-gaap:StatementGeographical, us-gaap:FairValueByAssetClass, us-gaap:RecourseStatus, us-gaap:UnderlyingAssetClass
us-gaap:ConsolidatedEntities, us-gaap:MortgageLoansOnRealEstateDescriptionLoanCategory, us-gaap:StatementGeographical, us-gaap:RecourseStatus, us-gaap:UnderlyingAssetClass
us-gaap:ConsolidatedEntities, us-gaap:RecourseStatus

us-gaap:Liabilities
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:BalanceSheetLocation, us-gaap:FairValueByAssetClass
us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass
us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass, us-gaap:RecourseStatus
us-gaap:ConsolidatedEntities, us-gaap:MortgageLoansOnRealEstateDescriptionLoanCategory, us-gaap:StatementGeographical, us-gaap:FairValueByAssetClass, us-gaap:RecourseStatus, us-gaap:UnderlyingAssetClass
us-gaap:ConsolidatedEntities, us-gaap:MortgageLoansOnRealEstateDescriptionLoanCategory, us-gaap:StatementGeographical, us-gaap:RecourseStatus, us-gaap:UnderlyingAssetClass
us-gaap:ConsolidatedEntities, us-gaap:RecourseStatus

us-gaap:LiabilitiesAndStockholdersEquity
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass

us-gaap:StockholdersEquity
us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass
us-gaap:StatementEquityComponents

us-gaap:Cash

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:ShortTermInvestments
us-gaap:ConsolidatedEntities
us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures

us-gaap:Goodwill

us-gaap:FiniteLivedIntangibleAssetsNet

us-gaap:IntangibleAssetsNetIncludingGoodwill

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OtherAssets
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass

us-gaap:LongTermDebt
ago:LoansInsuredOrGuaranteeForGovernmentAuthorities, us-gaap:CounterpartyName, us-gaap:StatementGeographical, us-gaap:SubsequentEventType
dei:LegalEntity
dei:LegalEntity, us-gaap:ConsolidationItems, us-gaap:LongtermDebtType
dei:LegalEntity, us-gaap:DebtInstrument, us-gaap:LongtermDebtType
dei:LegalEntity, us-gaap:LongtermDebtType

us-gaap:MinorityInterest
us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:OperatingLeaseLiability

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:StockholdersEquity
us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass
us-gaap:StatementEquityComponents

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass
us-gaap:StatementEquityComponents

us-gaap:CommonStockValue

us-gaap:RetainedEarningsAccumulatedDeficit
us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax
us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass

us-gaap:MinorityInterest
us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass

us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
us-gaap:StatementEquityComponents

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetIncomeLoss
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass

us-gaap:ProfitLoss
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:RepaymentsOfLongTermDebt
dei:LegalEntity, us-gaap:DebtInstrument, us-gaap:LongtermDebtType, us-gaap:SubsequentEventType
dei:LegalEntity, us-gaap:SubsequentEventType

us-gaap:PaymentsOfDividendsCommonStock

us-gaap:PaymentsForRepurchaseOfCommonStock
us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents, us-gaap:SubsequentEventType

us-gaap:EffectiveIncomeTaxRateContinuingOperations
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice

us-gaap:DeferredTaxLiabilities

us-gaap:ProceedsFromSaleOfShortTermInvestments

ago:AdjustedIncomeLossAttributabletoParent
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

ago:AdjustedIncomeLossfromContinuingOperationsbeforeIncomeTaxesNoncontrollingInterestSegmentTotal
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

ago:AdjustmentstoOperatingIncomePreTax

ago:AdjustmentstoOperatingIncomeTax
us-gaap:ConsolidatedEntities
ago:AssetManagementFees
us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass

ago:CommutationsGainLoss
us-gaap:CededCreditRisk
us-gaap:CededCreditRisk
ago:CommutationsIncreaseDecreaseinUnearnedPremiumsNet
us-gaap:CededCreditRisk
ago:CommutationsIncreaseinNetParOutstanding

ago:ContributionsFromNoncontrollingInterestsToInvestmentVehicles

ago:CreditDerivativeLosses
us-gaap:ConsolidationItems

ago:CreditDerivativeRealizedGainLossandOtherSettlements

ago:CreditDerivativeRealizedGains
us-gaap:FinancialInstrument
ago:DebtSecuritiesAvailableforsaleChangeinPresentValueAccretion

ago:DistributionsToNoncontrollingInterestsFromInvestmentVehicles

ago:EffectiveIncomeTaxRateReconciliationTaxesonReinsuranceAmount

ago:FairValueGainLossOnCommittedCapitalSecurities

ago:FairValueGainLossOnConsolidatedInvestmentVehicles
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass
us-gaap:Range, us-gaap:FairValueByLiabilityClass, us-gaap:ValuationTechnique
ago:FairValueInputsBankProfit
us-gaap:Range, us-gaap:FairValueByLiabilityClass, us-gaap:ValuationTechnique
ago:FairValueInputsHedgeCost
us-gaap:Range, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByLiabilityClass, us-gaap:ValuationTechnique
ago:FairValueInputsYearOneLossEstimates
us-gaap:FairValueByAssetClass
ago:FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetConsolidations
us-gaap:FairValueByLiabilityClass
ago:FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisLiabilityVIEConsolidations

ago:FinancialGuaranteeInsuranceContractsNetPremiumsReceivableAdjustmentAccretionofDiscountonNetPremiumReceivable

ago:FinancialGuaranteeInsuranceContractsPremiumsEarnedNet

ago:FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustmentForeignExchangeTranslation
us-gaap:ConsolidationItems

ago:FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustmentForeignExchangeTranslationSegmentTotal

ago:FinancialGuaranteeInsuranceContractsScheduledNetEarnedPremiums
us-gaap:MortgageLoansOnRealEstateDescriptionLoanCategory, us-gaap:StatementGeographical, us-gaap:UnderlyingAssetClass
ago:GuarantorObligationsDecreaseInExcessSpread

ago:GuarantorObligationsLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAfterRecoveriesforRepresentationsandWarranties
us-gaap:StatementGeographical, us-gaap:UnderlyingAssetClass
us-gaap:UnderlyingAssetClass

ago:GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarranties

ago:GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarrantiesAccretionOfDiscount

ago:GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarrantiesChangesInDiscountRates
us-gaap:MortgageLoansOnRealEstateDescriptionLoanCategory, us-gaap:StatementGeographical, us-gaap:UnderlyingAssetClass

ago:GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarrantiesChangesInTimingAndAssumptions
us-gaap:StatementGeographical
ago:GuarantorObligationsNetExpectedLosstobePaidAfterRecoveriesforRepresentationsandWarrantiesPercent
us-gaap:MortgageLoansOnRealEstateDescriptionLoanCategory, us-gaap:StatementGeographical, us-gaap:StatementScenario, us-gaap:UnderlyingAssetClass
ago:GuarantorObligationsProjectedLossAssumptionsIncreaseDecreaseinExpectedLosstobePaidNet
us-gaap:MortgageLoansOnRealEstateDescriptionLoanCategory, us-gaap:StatementGeographical, us-gaap:UnderlyingAssetClass
ago:GuarantorObligationsRecoveriesReceived

ago:IncomeLossfromContinuingOperationsbeforeEquityMethodInvestmentsIncomeTaxesNoncontrollingInterestSegmentTotal
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:Range
ago:InsuredFinancialObligationsClaimLiabilityRiskFreeDiscountRate

ago:InsuredFinancialObligationsClaimLiabilityWeightedAverageRiskFreeDiscountRate

ago:InsuredFinancialObligationsLiabilityforUnpaidClaimsAdjustmentExpenseClaimsPaid
ago:LoansInsuredOrGuaranteeForGovernmentAuthorities, us-gaap:CounterpartyName, us-gaap:StatementGeographical
ago:InsuredFinancialObligationsRefundedDuringPeriod
us-gaap:MortgageLoansOnRealEstateDescriptionLoanCategory, us-gaap:StatementGeographical, us-gaap:StatementScenario, us-gaap:FinancialInstrument, us-gaap:UnderlyingAssetClass
ago:LossEstimateSensitivityAnalysisChangeInEstimateForDecreasedConditionalDefaultRateRampDownPeriod
us-gaap:MortgageLoansOnRealEstateDescriptionLoanCategory, us-gaap:StatementGeographical, us-gaap:StatementScenario, us-gaap:FinancialInstrument, us-gaap:UnderlyingAssetClass
ago:LossEstimateSensitivityAnalysisChangeInEstimateForIncreasedConditionalDefaultRatePlateauPeriod

ago:NonRedeemableNoncontrollingInterestEquityOtherReallocationofOwnershipInterests
us-gaap:StatementEquityComponents

ago:NoncashCompensationandOperatingExpensesSegment
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

ago:OtherComprehensiveIncomeLossAvailableforsaleSecuritiesWithCreditImpairmentNetofTax

ago:OtherComprehensiveIncomeLossAvailableforsaleSecuritiesWithCreditImpairmentTax

ago:OtherComprehensiveIncomeLossAvailableforsaleSecuritiesWithoutCreditImpairmentNetofTax

ago:OtherComprehensiveIncomeLossAvailableforsaleSecuritiesWithoutCreditImpairmentTax

ago:OtherComprehensiveIncomeLossOtherNetofTaxPortionAttributableToParent

ago:PaydownOfFinancialGuarantyVariableInterestEntitiesLiabilities

ago:PaymentsforProceedsfromShorttermInvestmentswithMaturitiesofLessThanThreeMonths
us-gaap:SubsequentEventType
ago:PercentageIncreaseInCommonStockDividends

ago:PremiumsEarnedNetSpecialtyInsuranceandReinsurance

ago:ProceedsfromPaydownsonFinancialGuarantyVariableInterestEntitiesAssets

ago:RedeemableNoncontrollingInterestEquityOtherContributionstoInvestmentVehicles

ago:RedeemableNoncontrollingInterestEquityOtherReallocationofOwnershipInterests
dei:LegalEntity
ago:ReinsuranceRetentionPolicyReinsuredRiskPotentialPaymentsDuetoThirdPartiesAmount

ago:RepaymentofWarehouseLoansandEquity

ago:RevenueIncludingAdjustments
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

ago:SegmentBenefitsLossesAndExpenses
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

ago:SegmentIncomeTaxExpenseBenefit
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

ago:SegmentRevenueIncludingAdjustments
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:StatementGeographical

ago:TaxCutsandJobsActof2017IncompleteAccountingTransitionTaxforAccumulatedForeignEarningsTaxCreditRealized

ago:VariableInterestEntityChangeinFairValue
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass
us-gaap:FairValueByAssetClass

us-gaap:AssumedPremiumsEarned

us-gaap:AssumedPremiumsWritten
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:MeasurementInputType, us-gaap:ValuationTechnique
us-gaap:AssumptionForFairValueOnSecuritizationDateOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPrepaymentSpeed
us-gaap:Range, us-gaap:CreditDerivativesByContractType, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:MeasurementInputType
us-gaap:Range, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:MeasurementInputType, us-gaap:ValuationTechnique
us-gaap:Range, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByLiabilityClass, us-gaap:MeasurementInputType, us-gaap:ValuationTechnique

us-gaap:CededPremiumsEarned

us-gaap:CededPremiumsWritten
us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType
us-gaap:ConcentrationRiskPercentage1
us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType, us-gaap:InternalCreditAssessment

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded
us-gaap:FinancialInstrument
us-gaap:FinancialInstrument
us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossPeriodIncreaseDecrease

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossWriteoff

us-gaap:DebtSecuritiesAvailableForSaleRealizedGain

us-gaap:DebtSecuritiesAvailableForSaleRealizedLoss

us-gaap:DebtSecuritiesRealizedGainLoss

us-gaap:DerivativeGainLossOnDerivativeNet
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByAssetClass

us-gaap:DirectPremiumsEarned

us-gaap:DirectPremiumsWritten

us-gaap:DividendsCommonStockCash
us-gaap:StatementEquityComponents

us-gaap:EffectOfExchangeRateOnCashAndCashEquivalents

us-gaap:EmployeeBenefitsAndShareBasedCompensation

us-gaap:EquitySecuritiesFvNiRealizedGainLoss
dei:LegalEntity, us-gaap:StatementScenario
us-gaap:ExtinguishmentOfDebtGainLossNetOfTax
us-gaap:FairValueByAssetClass
us-gaap:FairValueAssetRecurringBasisStillHeldUnrealizedGainLossOci
us-gaap:FairValueByAssetClass, us-gaap:FinancialInstrument
us-gaap:FairValueByAssetClass
us-gaap:FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
us-gaap:FairValueByAssetClass, us-gaap:InvestmentType
us-gaap:FairValueByLiabilityClass
us-gaap:FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
us-gaap:FairValueByLiabilityClass
us-gaap:FairValueLiabilityRecurringBasisStillHeldUnrealizedGainLossOci
us-gaap:FairValueByAssetClass
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
us-gaap:FairValueByAssetClass, us-gaap:FinancialInstrument
us-gaap:FairValueByAssetClass, us-gaap:InvestmentType
us-gaap:FairValueByAssetClass
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
us-gaap:FairValueByAssetClass, us-gaap:FinancialInstrument
us-gaap:FairValueByAssetClass
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
us-gaap:FairValueByAssetClass, us-gaap:FinancialInstrument
us-gaap:FairValueByAssetClass, us-gaap:InvestmentType
us-gaap:FairValueByAssetClass
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
us-gaap:FairValueByAssetClass, us-gaap:FinancialInstrument
us-gaap:FairValueByAssetClass, us-gaap:InvestmentType
us-gaap:FairValueByAssetClass
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
us-gaap:FairValueByAssetClass, us-gaap:FinancialInstrument
us-gaap:FairValueByAssetClass, us-gaap:FinancialInstrument
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3
us-gaap:FairValueByLiabilityClass
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
us-gaap:FairValueByLiabilityClass
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome
us-gaap:FairValueByLiabilityClass
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues
us-gaap:FairValueByLiabilityClass
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements
us-gaap:DerivativeInstrumentRisk
us-gaap:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
us-gaap:DerivativeInstrumentRisk
us-gaap:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings
us-gaap:DerivativeInstrumentRisk
us-gaap:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationSettlements
us-gaap:ConsolidationItems
us-gaap:FairValueOptionChangesInFairValueGainLoss1
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass, us-gaap:FinancialInstrument
us-gaap:FairValueOptionCreditRiskGainsLossesOnAssets
us-gaap:ConsolidatedEntities, us-gaap:FinancialInstrument
us-gaap:ConsolidatedEntities, us-gaap:InvestmentType

us-gaap:FinancialGuaranteeInsuranceContractsAcceleratedPremiumRevenueAmount

us-gaap:FinancialGuaranteeInsuranceContractsClaimLiabilityWeightedAverageRiskFreeDiscountRate
us-gaap:Range

us-gaap:FinancialGuaranteeInsuranceContractsPremiumReceivableNewBusinessWritten

us-gaap:FinancialGuaranteeInsuranceContractsPremiumReceivableProceedsFromPremiumsReceived
us-gaap:ProductOrService
us-gaap:FinancialGuaranteeInsuranceContractsPremiumReceivedOverContractPeriodPremiumReceivableWeightedAverageRiskFreeDiscountRate

us-gaap:FinancialGuaranteeInsuranceContractsPremiumsReceivableAccretionOfDiscountOnPremiumReceivable

us-gaap:FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustmentChangeInPeriodOfContract

us-gaap:ForeignCurrencyTransactionGainLossBeforeTax

us-gaap:ForeignCurrencyTransactionGainLossRealized
dei:LegalEntity
us-gaap:ImpairmentOfIntangibleAssetsExcludingGoodwill
dei:LegalEntity, us-gaap:StatementScenario

us-gaap:IncomeLossFromEquityMethodInvestments
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:IncomeTaxReconciliationForeignIncomeTaxRateDifferential

us-gaap:IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate

us-gaap:IncomeTaxReconciliationOtherAdjustments

us-gaap:IncomeTaxReconciliationPriorYearIncomeTaxes

us-gaap:IncomeTaxReconciliationStateAndLocalIncomeTaxes

us-gaap:IncomeTaxReconciliationTaxContingencies

us-gaap:IncomeTaxReconciliationTaxExemptIncome

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:InterestAndDividendIncomeOperating
us-gaap:InvestmentType
us-gaap:Range, us-gaap:FairValueByAssetClass, us-gaap:LongTermPurchaseCommitmentByCategoryOfItemPurchased
us-gaap:InvestmentCompanyCommittedCapital

us-gaap:InvestmentIncomeInvestmentExpense
us-gaap:ConsolidatedEntities, us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:CreditFacility, us-gaap:FairValueByAssetClass
us-gaap:LineOfCreditFacilityCommitmentFeeAmount
us-gaap:ConsolidatedEntities, us-gaap:CreditFacility
us-gaap:ConsolidatedEntities, us-gaap:CreditFacility, us-gaap:FairValueByAssetClass
dei:LegalEntity, us-gaap:InvestmentType, us-gaap:LongTermPurchaseCommitmentByCategoryOfItemPurchased
us-gaap:LongTermPurchaseCommitmentAmount
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:InvestmentType

us-gaap:NetIncomeLossAttributableToRedeemableNoncontrollingInterest

us-gaap:NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest
us-gaap:StatementEquityComponents

us-gaap:NoncashOrPartNoncashAcquisitionInvestmentsAcquired1

us-gaap:NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionAfterTaxAndReclassificationAdjustment

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax

us-gaap:OtherCostAndExpenseOperating
us-gaap:ConsolidatedEntities

us-gaap:PaymentsForProceedsFromOtherInvestingActivities

us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesDebt

us-gaap:PaymentsToAcquireOtherInvestments

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ago:StatutoryAccountingPracticesStatutoryAmountAvailableforDividendPaymentswithoutRegulatoryApprovalAvailableinNextFiscalQuarter

ago:TaxCutsandJobsActof2017DeferredTaxAssetsTaxCreditCarryforwardsForeign
dei:LegalEntity, us-gaap:StatutoryAccountingPracticesByJurisdiction
ago:UnencumberedAsset
us-gaap:ConsolidatedEntities, us-gaap:BalanceSheetLocation, us-gaap:FairValueByAssetClass
ago:VariableInterestEntitiesCollateralizedLoanObligationsWeightedAverageInterestRate
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
ago:VariableInterestEntityConsolidatedAssetsatFairValue
us-gaap:FairValueByMeasurementFrequency

ago:VariableInterestEntityConsolidatedCarryingAmountLiabilitiesWithRecourse
us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass

ago:VariableInterestEntityConsolidatedCarryingAmountLiabilitiesWithoutRecourse
us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
ago:VariableInterestEntityConsolidatedLiabilitieswithRecourseatFairValue
us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
ago:VariableInterestEntityConsolidatedLiabilitieswithoutRecourseatFairValue
us-gaap:FairValueByMeasurementFrequency

ago:VariableInterestEntityNumberofPoliciesMonitored

ago:VariableInterestEntityNumberofPoliciesMonitoredNotWithintheScopeofASC810

ago:VariableInterestEntityOtherConsolidatedCarryingAmountAssets

ago:VariableInterestEntityOtherConsolidatedCarryingAmountLiabilities
us-gaap:ProductOrService
us-gaap:AccruedFeesAndOtherRevenueReceivable

us-gaap:AccruedInvestmentIncomeReceivable

us-gaap:AociTaxAttributableToParent
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:InvestmentType, us-gaap:ValuationTechnique
us-gaap:AssetsFairValueDisclosure
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:ValuationTechnique
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementFrequency

us-gaap:AssetsHeldInTrust
dei:LegalEntity

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

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

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis
us-gaap:FairValueByAssetClass, us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:InvestmentType
us-gaap:InvestmentType
us-gaap:AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis
us-gaap:InvestmentType
us-gaap:AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue
us-gaap:InvestmentType
us-gaap:AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis
us-gaap:InvestmentType
us-gaap:AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenFairValue
us-gaap:InvestmentType
us-gaap:AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCostBasis
us-gaap:InvestmentType
us-gaap:AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue
us-gaap:InvestmentType
us-gaap:AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis
us-gaap:InvestmentType
us-gaap:AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue

us-gaap:AvailableForSaleSecuritiesDebtSecurities

us-gaap:BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount

us-gaap:CompensationAndBenefitsTrust

us-gaap:CreditRiskDerivativeLiabilitiesAtFairValue
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementFrequency

us-gaap:CreditRiskDerivativesAtFairValueNet
us-gaap:StatementGeographical, us-gaap:UnderlyingAssetClass
dei:LegalEntity, us-gaap:DebtInstrument
us-gaap:DebtInstrumentBasisSpreadOnVariableRate

us-gaap:DebtInstrumentCarryingAmount
dei:LegalEntity
us-gaap:ConsolidationItems

us-gaap:DebtInstrumentFaceAmount
dei:LegalEntity
dei:LegalEntity, us-gaap:ConsolidationItems, us-gaap:LongtermDebtType
dei:LegalEntity, us-gaap:DebtInstrument, us-gaap:LongtermDebtType
dei:LegalEntity, us-gaap:LongtermDebtType
dei:LegalEntity, us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:DebtInstrumentInterestRateEffectivePercentage

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

us-gaap:DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:InvestmentType

us-gaap:DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:InvestmentType

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger
us-gaap:InvestmentType

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
us-gaap:InvestmentType

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months
us-gaap:InvestmentType

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
us-gaap:InvestmentType

us-gaap:DebtSecuritiesAvailableForSaleExcludingAccruedInterest
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType
us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:InvestmentType

us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition
us-gaap:InvestmentType

us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss
us-gaap:InvestmentType

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredPolicyAcquisitionCosts

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsInvestments

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsTaxCreditCarryforwardsForeign

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsUnearnedPremiumsReserve

us-gaap:DeferredTaxLiabilitiesDeferredExpenseDeferredPolicyAcquisitionCost

us-gaap:DeferredTaxLiabilitiesDeferredExpenseReservesAndAccruals

us-gaap:DeferredTaxLiabilitiesFinancingArrangements

us-gaap:DeferredTaxLiabilitiesLeasingArrangements

us-gaap:DeferredTaxLiabilitiesOther

us-gaap:DerivativeCreditRiskValuationAdjustmentDerivativeLiabilities
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByAssetClass
us-gaap:DerivativeNotionalAmount
us-gaap:Range, us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByAssetClass
us-gaap:UnderlyingAssetClass
us-gaap:FairValueByMeasurementBasis, us-gaap:InvestmentType
us-gaap:DueFromCorrespondentBrokers

us-gaap:DueFromRelatedParties
us-gaap:FairValueByMeasurementBasis, us-gaap:InvestmentType
us-gaap:DueToCorrespondentBrokers

us-gaap:DueToRelatedPartiesCurrentAndNoncurrent
us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:AwardType
us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass
us-gaap:EquityMethodInvestments
us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:EquityMethodInvestmentsFairValueDisclosure
us-gaap:FairValueByAssetClass
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
us-gaap:FairValueByAssetClass, us-gaap:FinancialInstrument
us-gaap:FairValueByAssetClass, us-gaap:InvestmentType
us-gaap:FairValueByLiabilityClass
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
us-gaap:DerivativeInstrumentRisk
us-gaap:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs
us-gaap:ConsolidatedEntities
us-gaap:FairValueOptionAggregateDifferencesLoansAndLongTermReceivables
us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass
us-gaap:ConsolidatedEntities
us-gaap:FairValueOptionLoansHeldAsAssets90DaysOrMorePastDue
us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass

us-gaap:FinanceLeaseLiability

us-gaap:FinanceLeaseLiabilityPaymentsDue

us-gaap:FinanceLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:FinanceLeaseRightOfUseAsset

us-gaap:FinanceLeaseWeightedAverageDiscountRatePercent
us-gaap:ProductOrService
us-gaap:FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedDuringFirstQuarterFollowingBalanceSheetDate
us-gaap:ProductOrService
us-gaap:FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedDuringFourthQuarterFollowingBalanceSheetDate
us-gaap:ProductOrService
us-gaap:FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedDuringSecondQuarterFollowingBalanceSheetDate
us-gaap:ProductOrService
us-gaap:FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedDuringThirdQuarterFollowingBalanceSheetDate
us-gaap:ProductOrService
us-gaap:FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThan10AndWithin15YearsFromBalanceSheetDate
us-gaap:ProductOrService
us-gaap:FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThan15AndWithin20YearsFromBalanceSheetDate
us-gaap:ProductOrService
us-gaap:FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThanFiveAndWithin10YearsFromBalanceSheetDate
us-gaap:ProductOrService
us-gaap:FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThanFourAndWithinFiveYearsFromBalanceSheetDate
us-gaap:ProductOrService
us-gaap:FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThanOneAndWithinTwoYearsFromBalanceSheetDate
us-gaap:ProductOrService
us-gaap:FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThanThreeAndWithinFourYearsFromBalanceSheetDate
us-gaap:ProductOrService
us-gaap:FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThanTwoAndWithinThreeYearsFromBalanceSheetDate
us-gaap:ProductOrService
us-gaap:FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedOneYearFromBalanceSheetDate
us-gaap:ConsolidatedEntities
us-gaap:FinancialGuaranteeInsuranceContractsPremiumExpectedToBeCollectedDuringFirstQuarterFollowingBalanceSheetDate
us-gaap:ConsolidatedEntities
us-gaap:FinancialGuaranteeInsuranceContractsPremiumExpectedToBeCollectedDuringFourthQuarterFollowingBalanceSheetDate
us-gaap:ProductOrService
us-gaap:ConsolidatedEntities
us-gaap:FinancialGuaranteeInsuranceContractsPremiumExpectedToBeCollectedDuringSecondQuarterFollowingTheBalanceSheetDate
us-gaap:ProductOrService
us-gaap:ConsolidatedEntities
us-gaap:FinancialGuaranteeInsuranceContractsPremiumExpectedToBeCollectedDuringThirdQuarterFollowingBalanceSheetDate
us-gaap:ProductOrService
us-gaap:ConsolidatedEntities
us-gaap:FinancialGuaranteeInsuranceContractsPremiumExpectedToBeCollectedMoreThan10AndWithin15YearsFromBalanceSheetDate
us-gaap:ProductOrService
us-gaap:ConsolidatedEntities
us-gaap:FinancialGuaranteeInsuranceContractsPremiumExpectedToBeCollectedMoreThan15AndWithin20YearsFromBalanceSheetDate
us-gaap:ProductOrService
us-gaap:ConsolidatedEntities
us-gaap:FinancialGuaranteeInsuranceContractsPremiumExpectedToBeCollectedMoreThanFiveAndWithin10YearsFromBalanceSheetDate
us-gaap:ProductOrService
us-gaap:ConsolidatedEntities
us-gaap:FinancialGuaranteeInsuranceContractsPremiumExpectedToBeCollectedMoreThanFourAndWithinFiveYearsFromBalanceSheetDate
us-gaap:ProductOrService
us-gaap:ConsolidatedEntities
us-gaap:FinancialGuaranteeInsuranceContractsPremiumExpectedToBeCollectedMoreThanOneAndWithinTwoYearsFromBalanceSheetDate
us-gaap:ProductOrService
us-gaap:ConsolidatedEntities
us-gaap:FinancialGuaranteeInsuranceContractsPremiumExpectedToBeCollectedMoreThanThreeAndWithinFourYearsFromBalanceSheetDate
us-gaap:ProductOrService
us-gaap:ConsolidatedEntities
us-gaap:FinancialGuaranteeInsuranceContractsPremiumExpectedToBeCollectedMoreThanTwoAndWithinThreeYearsFromBalanceSheetDate
us-gaap:ProductOrService
us-gaap:ConsolidatedEntities
us-gaap:FinancialGuaranteeInsuranceContractsPremiumExpectedToBeCollectedWithinOneYearFromBalanceSheetDate
us-gaap:ProductOrService

us-gaap:FinancialGuaranteeInsuranceContractsPremiumReceivable
us-gaap:ConsolidatedEntities
us-gaap:ProductOrService
us-gaap:ConsolidatedEntities
us-gaap:FinancialGuaranteeInsuranceContractsPremiumReceivablePremiumExpectedToBeCollected
us-gaap:ProductOrService
us-gaap:ProductOrService
us-gaap:FinancialGuaranteeInsuranceContractsPremiumReceivedOverContractPeriodUnearnedPremiumRevenue

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo

us-gaap:FiniteLivedIntangibleAssetsGross
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:CededCreditRisk
us-gaap:FundsHeldUnderReinsuranceAgreementsLiability
us-gaap:CreditRatingAMBest, us-gaap:Collateral
us-gaap:GuarantyLiabilities
us-gaap:CreditRatingStandardPoors, us-gaap:Collateral

us-gaap:Investments
us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass
us-gaap:ConsolidatedEntities
us-gaap:InvestmentsAndCash
dei:LegalEntity, us-gaap:InvestmentType, us-gaap:LongTermPurchaseCommitmentByCategoryOfItemPurchased
us-gaap:InvestmentsFairValueDisclosure

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByLiabilityClass, us-gaap:ValuationTechnique
us-gaap:LiabilitiesFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementFrequency

us-gaap:LiabilityForClaimsAndClaimsAdjustmentExpense
us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet
us-gaap:ProductOrService
us-gaap:ConsolidatedEntities, us-gaap:ClassOfFinancingReceivableTypeOfBorrower, us-gaap:CreditFacility, us-gaap:FairValueByAssetClass
us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity
us-gaap:ConsolidatedEntities, us-gaap:CreditFacility, us-gaap:FairValueByAssetClass
us-gaap:ConsolidatedEntities, us-gaap:CreditFacility, us-gaap:FairValueByAssetClass
us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity
dei:LegalEntity, us-gaap:Range, us-gaap:InvestmentType, us-gaap:LongTermPurchaseCommitmentByCategoryOfItemPurchased
us-gaap:LongTermDebtFairValue
us-gaap:FairValueByMeasurementBasis

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
dei:LegalEntity

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
dei:LegalEntity
us-gaap:ConsolidationItems

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
dei:LegalEntity
dei:LegalEntity
us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
us-gaap:ConsolidationItems
dei:LegalEntity, us-gaap:BusinessAcquisition
us-gaap:NotesPayableRelatedPartiesCurrentAndNoncurrent

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent

us-gaap:OperatingLossCarryforwards
us-gaap:BusinessAcquisition

us-gaap:OtherAssetsFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis, us-gaap:InvestmentType
us-gaap:FairValueByMeasurementFrequency
us-gaap:OtherCommitments, us-gaap:UnderlyingAssetClass
us-gaap:OtherCommitment

us-gaap:OtherInvestments
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementFrequency
us-gaap:InvestmentType

us-gaap:OtherLiabilities
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:OtherLiabilitiesFairValueDisclosure
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementFrequency

us-gaap:PremiumsReceivableAtCarryingValue
us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass
us-gaap:LongTermPurchaseCommitmentByCategoryOfItemPurchased
us-gaap:PurchaseCommitmentRemainingMinimumAmountCommitted

us-gaap:RedeemableNoncontrollingInterestEquityOtherCarryingAmount
us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass

us-gaap:RedeemableNoncontrollingInterestEquityOtherFairValue
us-gaap:FairValueByAssetClass

us-gaap:ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments

us-gaap:RestrictedCash

us-gaap:SalvageAndSubrogationRecoveriesValue
us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass
us-gaap:ConsolidatedEntities, us-gaap:InternalCreditAssessment, us-gaap:ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationBySurveillanceCategory
us-gaap:ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationGrossClaimLiability
us-gaap:ConsolidatedEntities, us-gaap:InternalCreditAssessment, us-gaap:ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationBySurveillanceCategory
us-gaap:ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationInsuredContractualPaymentsOutstanding
us-gaap:ConsolidatedEntities, us-gaap:InternalCreditAssessment, us-gaap:ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationBySurveillanceCategory
us-gaap:ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationInsuredContractualPaymentsOutstandingInterest
us-gaap:ConsolidatedEntities, us-gaap:InternalCreditAssessment, us-gaap:ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationBySurveillanceCategory
us-gaap:ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationInsuredContractualPaymentsOutstandingPrincipal
us-gaap:ConsolidatedEntities, us-gaap:InternalCreditAssessment, us-gaap:ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationBySurveillanceCategory
us-gaap:ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationNetClaimLiability
us-gaap:ConsolidatedEntities, us-gaap:InternalCreditAssessment, us-gaap:ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationBySurveillanceCategory
us-gaap:ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationReductionsOfGrossClaimLiabilityGrossPotentialRecoveries
us-gaap:ConsolidatedEntities, us-gaap:InternalCreditAssessment, us-gaap:ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationBySurveillanceCategory
us-gaap:ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationReductionsOfGrossClaimLiabilityNetDiscount
us-gaap:ConsolidatedEntities, us-gaap:InternalCreditAssessment, us-gaap:ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationBySurveillanceCategory
us-gaap:ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationStatementOfFinancialPositionClaimLiability
us-gaap:ConsolidatedEntities, us-gaap:InternalCreditAssessment, us-gaap:ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationBySurveillanceCategory
us-gaap:ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationStatementOfFinancialPositionUnearnedPremiumRevenue
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
us-gaap:AwardType
us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
dei:LegalEntity, us-gaap:StatutoryAccountingPracticesByJurisdiction
us-gaap:StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPayments
dei:LegalEntity, us-gaap:RelatedPartyTransactionsByRelatedParty, us-gaap:StatutoryAccountingPracticesByJurisdiction
us-gaap:StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithoutRegulatoryApproval
dei:LegalEntity, us-gaap:StatutoryAccountingPracticesByJurisdiction
dei:LegalEntity
us-gaap:StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance
dei:LegalEntity
us-gaap:StatutoryAccountingPracticesStatutoryCapitalAndSurplusRequired
us-gaap:StatementEquityComponents, us-gaap:SubsequentEventType
us-gaap:StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1

us-gaap:TaxCreditCarryforwardValuationAllowance
us-gaap:BusinessAcquisition

us-gaap:UnearnedPremiums
us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass

us-gaap:UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued

us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
us-gaap:ConsolidatedEntities
us-gaap:VariableInterestEntityEntityMaximumLossExposureAmount

Plots across concepts


IncomeStatement
Other Comprehensive Income Loss Net Of Tax
Expenses
Income Tax Expense Benefit
Balance Sheet
Finite Lived Intangible Assets Net
Assets
Operating Lease Right Of Use Asset
Current Assets
Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents
NonCurrent Assets
Finite Lived Intangible Assets Net
Liabilities
Operating Lease Liability
Noncurrent Liabilities
Minority Interest
Stockholders Equity
Common Stock Value
CashFlow
Net Cash Provided By Used In Operating Activities
NetCashProvidedByUsedInOperatingActivities
Net Cash Provided By Used In Operating Activities
NetCashProvidedByUsedInInvestingActivities
Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInFinancingActivities
Proceeds From Payments For Other Financing Activities
Shares
Weighted Average Number Of Shares Outstanding Basic
DividendsAndRepurchase
Dividends Common Stock Cash
LesseeOperatingLeaseLiabilityPaymentsDue
Lessee Operating Lease Liability Payments Due Year Four
FiniteLivedIntangibleAssets
Finite Lived Intangible Assets Accumulated Amortization
BanksAndOrInsurance
Interest And Dividend Income Operating

Tables

  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:CommonStockValue ▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁████████████▇▇▇▇▇▇1.01.01.01.01.01.01.01.01.01.01.01.01.01.01.01.01.01.01.01.01.01.01.01.01.02.02.02.02.02.02.02.02.02.02.02.01.9391.8251.8221.8221.8421.841.837NANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding ▁█76.077.5NA83.887.092.6NA98.9101.9104.0NA109.3112.9116.6NA120.7122.7127.1NA132.8134.8137.0NA146.5151.6156.8NA169.7179.5183.1NA183.9188.8193.9NA194.7187.0182.4NA184.0184.2187.1NA187.3188.8
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic ▁█75.276.7NA83.286.592.6NA98.2101.2103.0NA108.0111.7115.2NA118.7121.3125.3NA131.9134.0136.2NA145.8150.6155.8NA168.8178.4182.1NA182.9187.8193.9NA194.0186.3182.4NA183.2184.2183.9NA183.7184.1
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount NA0.3NA0.50.61.7NA0.00.10.0NA0.00.10.2NA0.00.10.1NA0.00.60.8NA1.30.10.7NA1.91.51.5NA1.92.05.1NA3.913.018.7NA3.59.64.9NA4.72.7
us-gaap:EarningsPerShareBasic ▅▄▆▅▆▃▅▄▅▄▅▅▄▅▄▆▅▆▅▇▅▄▇▅▆▅▇▆▅▄▆▆▅▃▄▄▆▁▃█▃▄▃▅▅1.310.141.76999999999999961.032.11-0.591.430.711.40.520.841.480.671.710.441.751.262.531.513.631.090.433.050.881.971.293.32.10.890.231.912.11.17-0.740.380.732.02-2.65-0.464.15-0.310.68-1.00.891.1
us-gaap:EarningsPerShareDiluted ▅▄▆▅▆▃▅▄▅▄▅▅▄▅▄▆▅▆▅▇▅▄▇▅▆▅▇▆▅▄▆▆▅▃▄▄▆▁▃█▃▄▃▅▅1.290.141.76000000000000021.022.1-0.591.420.71.390.520.831.470.671.680.441.721.242.491.493.61.090.433.030.881.961.283.282.090.890.231.92.091.16-0.740.380.732.01-2.65-0.464.13-0.310.67-1.00.881.08
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
 EBT Margin us-gaap:StatutoryAccountingPracticesByJurisdiction country:BM▂▂▃▂▃▁▂▂▂▂▂▃▂▃▃▃▃▃▃▃▃▂▆▃▄▄█▅▃▁28.030.057.035.045.014.036.037.040.033.042.047.036.052.051.061.047.057.069.069.059.042.0152.058.078.073.0197.0106.061.01.0NANA40.0-49.0NANA79.0-77.0NANANANANANANA
 EBT Margin us-gaap:StatutoryAccountingPracticesByJurisdiction country:GB▅▅▆▇▅▂█▁▃▅▃▇▂▂▂▃▃▃17.013.024.033.014.0-11.041.0-17.0-1.013.0-4.036.0-5.0-6.0-8.0-4.0-4.0-4.0NA-2.0NA-2.0-1.0-1.0-1.0-4.0-1.0-1.0-1.0-1.0NANANANANANANANANANANANANANANA
 EBT Margin us-gaap:StatutoryAccountingPracticesByJurisdiction country:US▂▁▃▂▃▁▂▂▂▂▂▂▂▃▃▆▃▅▄▅▄▂▇▃▇▃█▅▃▂150.0134.0288.0200.0313.093.0217.0186.0227.0149.0174.0191.0190.0247.0238.0566.0265.0474.0401.0499.0337.0205.0624.0311.0618.0300.0725.0420.0293.0195.0NANA425.0-127.0NANA676.0-285.0NANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:BenefitsLossesAndExpenses ▃▄▅▅▄▄▄▃▂▃▃▂▃▂▃▇▄▄▅▂▅▄▅▅▇▃▄▁▃▃▄▃▃▁▃▄▅█▅▇▅▂▅▅▄105.0171.0229.0196.0150.0154.0159.0120.085.0139.0113.099.0134.076.0125.0310.0158.0155.0199.086.0195.0180.0191.0196.0286.0103.0165.037.0135.0126.0160.0134.0136.036.0134.0163.0205.845338.213225.633289.133215.64561.968191.451195.82153.181
us-gaap:ComprehensiveIncomeNetOfTax ▆▃▇▆█▁▆▅▆▆170.0-114.0242.0157.0378.0-259.0160.093.0176.0222.0NANANANANANANANANANANANANANANANANANANANANANANANANANANA-452.136-43.171882.62376.742113.82-355.166310.799230.071
us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest ▇▇▄▆█▁4.04.01.03.05.0-3.0NANA0.00.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest ▄▃▅▄▅▂▄▄▄▅▄▄▃▄▄▅▅▅▃▆▄▄▅▄▄▄▆▅▅▄▅▅▃▂▄▅▆▁▃█▄▄174.0-110.0243.0160.0383.0-262.0159.093.0176.0222.0103.087.013.071.042.0219.0262.0374.0-12.0454.0210.0141.0393.0163.0166.0201.0569.0356.0227.0146.0303.0381.0-19.0-212.058.0243.0407.503-452.0-40.63882.062.382100.304NANA254.474
us-gaap:DeferredPolicyAcquisitionCostAmortizationExpense ▃▃▄▃▃▃▄▃▃▄▃▃▃▄▄▄▃▃▄▃▄▃▄▄▄▃█▃▃▄▃▃▂▃▁▃▃▄▅▅▆▅▇▅▅4.03.05.04.04.03.05.03.04.06.04.03.04.05.06.05.04.04.05.04.05.04.05.05.06.04.013.04.03.05.04.04.01.03.00.04.04.5265.4136.77.2789.5337.4211.08.0236.936
 us-gaap:GainsLossesOnExtinguishmentOfDebt dei:LegalEntity,us-gaap:StatementScenario ago:AssuredGuarantyMunicipalHoldingsInc,srt:ScenarioForecastNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest ▆▃▇▄█▁▆▅▇▄▅▇▅█125.015.0174.079.0222.0-62.0138.086.0182.058.0101.0175.087.0217.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments ▄▄▄▄▅▄▄▄▅▄▄▄▄▅▄▅▄▅▅▆▅▄▆▄▅▅▇▆▅▄▆▆▅▃▄▄▆▁▃█▃▅▃▄▅91.06.0150.072.0222.0-58.0137.086.0181.056.0101.0175.087.0217.0156.0313.0150.0372.0271.0480.0201.065.0584.0172.0409.0266.0756.0488.0218.069.0489.0536.0329.0-212.095.0179.0553.653-695.619-146.81056.066-113.633192.085-312.6151.651294.504
us-gaap:IncomeTaxExpenseBenefit 23.0NA25.0-10.034.0-4.02.017.040.04.013.014.012.020.0104.0105.0-3.055.074.01.055.06.0155.043.0112.065.0224.0133.059.027.0140.0152.0110.0-68.021.037.0177.105-212.595-63.2294.913-55.96666.678-129.1-12.94890.966
us-gaap:InterestExpense ▄▃▃▃▃▄▄▄▄▄▄▄▅▅▅▅▆▅▆▇▆▇▆▆▇▆▆█▂▂▁▃▃▃▃▃▇▆▆▆▆▆▆▆▆23.021.021.021.021.022.022.022.022.023.023.023.024.024.024.024.025.024.025.026.025.026.025.025.026.025.025.027.020.020.019.021.021.021.021.021.025.42624.67324.724.96824.69624.7624.724.88624.831
us-gaap:InterestPaidNet ▆▁▆▁▆▁▆▁▆▁▆▁▇▄▄▁▇▁█▁█▁█▁█▁█▁▅▁▆▁▆▁▆▁▇▂▆▂▆▂▆▂▆32.08.032.08.032.09.033.09.033.09.033.09.036.021.024.08.037.08.040.07.041.07.040.07.041.07.041.09.028.08.029.09.029.09.029.09.21334.70512.08233.49912.38933.52112.1931.72713.32132.678
us-gaap:NetIncomeLoss ▄▃▄▃▄▂▄▃▄▃▃▄▃▅▃▅▄▆▅▇▄▃▇▄▆▅█▆▄▃▆▆▅▁98.011.0148.086.0183.0-55.0137.069.0142.054.088.0161.075.0197.052.0208.0153.0317.0197.0479.0146.059.0429.0129.0297.0201.0532.0355.0159.042.0349.0384.0219.0-144.0NANANANANANA-57.7NANANA203.5
us-gaap:NetIncomeLossAttributableToNoncontrollingInterest ▇▇▄▆█▁▃▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄4.04.01.03.05.0-3.0-1.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0NANANANANANANANANANANANANA
us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic ▄▄▅▄▅▃▄▄▅▄▄▅▄▅▄▅▅▆▅▆▅▄▆▄▅▅▇▆▅▄▆▆▅▃▄▅▆▁▃█▃▅▃▅▅98.011.0147.086.0183.0-55.0136.069.0142.054.088.0160.075.0196.052.0208.0153.0317.0197.0478.0146.058.0428.0129.0297.0201.0532.0354.0159.042.0349.0384.0219.0-144.074.0142.0376.548-483.024-83.6761.153-42.6140.6-183.5164.599179.1
us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted ▄▄▅▄▅▃▄▄▅▄▄▅▄▅▄▅▅▆▅▆▅▄▆▄▅▅▇▆▅▄▆▆▅▃▄▅▆▁▃█▃▄▃▅▅98.011.0147.086.0183.0-55.0136.069.0142.054.088.0160.075.0196.052.0208.0153.0317.0197.0478.0146.058.0428.0129.0297.0201.0532.0354.0159.042.0348.0384.0219.0-144.075.0142.0376.0-482.4-83.6760.8-57.7139.1-183.1164.3203.3
us-gaap:NetInvestmentIncome ▁▁▁▁▂▃▃▄▆▅▅▅▅▅▅▅▅█▇▄▅▅▇▇▅▅▅▅▅▆▆▅▄▄▆▅▅▅▅▄▅▅▄▃▄68.070.068.071.078.080.082.088.0110.098.0100.098.099.0101.096.099.0101.0122.0117.094.098.099.0112.0112.098.0101.0102.0102.096.0103.0107.099.093.094.0103.0102.0101.58897.762100.393.534100.82796.38793.985.61590.871
us-gaap:OtherComprehensiveIncomeLossNetOfTax ▆▂▆▆█▁▅▅▅█▅▃▃▂▄▅72.0-125.094.071.0195.0-204.023.024.034.0168.015.0-74.0-62.0-126.0-10.011.0NANANANANA82.0-36.034.0-131.00.037.01.068.0104.0NANANANANANANANANANANANANANANA
us-gaap:OtherIncome 14.0NA0.05.02.07.0-8.0-9.025.08.0-5.014.0-44.013.09.0274.022.089.0-10.0-3.018.034.0-6.0-3.055.0-9.0-3.0-11.07.021.0-5.016.0-7.0-14.0-4.016.04.45890.984-1.0-7.5528.77542.15132.733.682-13.396
us-gaap:PolicyholderBenefitsAndClaimsIncurredNet ▂▃▄▄▃▃▃▃▂▃▃▃▃▂▃▇▄▄▅▂▅▄▅▅▇▃▄▁▃▃▄▃▄▁▄▄▅█▆▇▅▁▅▅▄-16.030.073.073.037.020.018.030.0-1.046.021.017.044.0-18.034.0223.072.059.0112.0-9.0102.090.0106.0112.0188.018.072.0-44.057.041.085.055.062.0-48.064.090.0122.446246.847148.6214.991132.908-27.047104.8110.77271.156
us-gaap:PremiumsEarnedNet ▁▁▃▁▂▁▂▂▁▂▂▂▂▃▄▄▃▃▆▆▅▄▄▅▅▂▃▃▂▂▄▃▃▆▅▅▅▄▆▅▆▇███102.0103.0154.0107.0121.0103.0123.0123.0112.0118.0125.0142.0136.0145.0178.0186.0162.0164.0236.0231.0214.0183.0192.0213.0219.0142.0158.0144.0136.0132.0182.0159.0163.0248.0218.0222.0219.299193.677225.0211.073230.068254.0286.3288.767292.11
us-gaap:ProfitLoss ▄▄▅▄▅▃▄▄▅▄▄▅▄▅▄▅▅▆▅▆▅▄▆▄▅▅▇▆▅▄▆▆▅▃▄▅▆▁▃█▃▄▃▅▅102.015.0149.089.0188.0-58.0136.069.0142.054.088.0161.075.0197.052.0208.0153.0317.0197.0479.0146.059.0429.0129.0297.0201.0532.0355.0159.042.0349.0384.0219.0-144.074.0142.0377.0-483.0-83.6761.2-57.667125.407-183.5164.6203.538
us-gaap:RealizedInvestmentGainsLosses ▅▄▅▆▅▄▆▆▅▃▃▄▄▄▃▅▆█▂▄▆▃▄▂▄▆▁▃▄▅█▄▅█▅▅▄▅▄▃▄▅▅▄▄4.0-3.06.013.04.0-5.010.016.08.0-12.0-18.0-7.0-2.0-5.0-14.07.015.032.0-24.0-2.010.0-13.0-6.0-27.0-9.016.0-35.0-19.0-8.02.029.0-7.02.028.01.02.0-3.1561.316-4.6-11.085-5.092.806-0.6-2.374-8.438
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax ▅▅▅▅▅▅▅▅▅▅▃▅▅▅▁▆▅▆▆▆▆▅▇▆▆▆▇▆▆▅▆▆▆▄▅▅▇▄▅█▅▅▅▆▆21.024.029.017.020.023.022.00.00.00.0-788.0274.0221.0293.0-1458.0623.0308.0527.0470.0566.0396.0245.0775.0368.0695.0369.0921.0525.0353.0195.0649.0670.0465.0-176.0229.0342.0759.498-357.40678.9071345.199102.012254.053-34.945347.471447.685
us-gaap:Revenues ▃▃▄▄▄▃▃▃▄▃▃▄▃▄▄▅▄▅▄▅▄▃▆▄▅▄▆▅▄▃▅▅▄▂▃▄▆▁▃█▃▄▂▄▄196.0177.0379.0268.0372.096.022.0206.0266.0195.0214.0274.0221.0293.0281.0623.0308.0527.0470.0566.0396.0245.0775.0368.0695.0369.0921.0525.0353.0195.0649.0670.0465.0-176.0229.0342.0759.498-357.40678.9071345.199102.012254.053-34.945347.471447.685
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:Assets ▅▄▃▂▂▁▂▁▁▁▁▁▂▂▂▂▂▂▂▂▂▂▂▃▃▂▃▃▃▃▄▄▄▅▅▅▆▆▆▆▇▇█17226.016018.015334.014695.014780.013745.014326.013367.013581.013551.013603.013739.014132.014019.014433.014649.014655.014675.014151.014669.014092.014452.014544.015034.015479.014677.014925.015369.015690.015106.016287.016354.016608.017299.017242.017563.018074.46418504.81318091.53118404.99519238.86419509.17820471.512NANA
us-gaap:Liabilities ▄▃▂▂▂▂▂▁▁▁▁▁▂▁▂▂▂▂▂▂▂▂▂▃▃▃▃▃▄▃▄▄▅▅▅▅▆▆▆▆▇▇█10653.09525.08629.08078.08271.07472.07674.06715.06859.06882.07048.07156.07498.07235.07594.07771.07905.08038.07647.08029.07842.08339.08481.09215.09673.08891.09167.010015.010448.09897.011172.011520.012124.012575.012248.012611.013350.39814322.29513373.09513638.2815288.87915614.68716672.748NANA
us-gaap:LiabilitiesAndStockholdersEquity ▅▄▃▂▂▁▂▁▁▁▁▁▂▂▂▂▂▂▂▂▂▂▂▃▃▂▃▃▃▃▄▄▄▅▅▅▆▆▆▆▇▇█17226.016018.015334.014695.014780.013745.014326.013367.013581.013551.013603.013739.014132.014019.014433.014649.014655.014675.014151.014669.014092.014452.014544.015034.015479.014677.014925.015369.015690.015106.016287.016354.016608.017299.017242.017563.018074.46418504.81318091.53118404.99519238.86419509.17820471.512NANA
us-gaap:StockholdersEquity ▇▇▇▇▇▆▇▇██▇▇▇████▇▇▇▆▆▆▅▅▅▅▄▄▄▄▃▂▃▃▃▃▂▃▃▁6503.06430.06643.06549.06444.06240.06639.06652.06722.06669.06555.06583.06634.06784.06839.06878.06750.06637.06504.06640.06250.06113.06063.05819.05806.05786.05758.05354.05242.05209.05115.04834.04484.04724.04994.04952.04724.0664182.5184651.5654766.7153950.0NA3798.764NANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:Cash ▂▁▂▂▃▂▂▂▂▁▁▁▂▁▂▁▂▂▁▁▂▁▂▁▁█▁▁▁▂▂▁▂▂▂▂▂▂▂▂▂▁▁▁▁144.095.0162.0223.0293.0139.0169.0229.0190.0123.0104.082.0185.0114.0144.072.0200.0147.0118.098.0190.0112.0166.066.075.0885.075.082.0106.0219.0184.0106.0143.0125.0138.0133.0175.347182.003214.544173.26159.1795.866107.17994.40697.212
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents ▅▆▅▇█▃▃▄▃▂▁▁▃▂▂296.0346.0298.0406.0473.0221.0183.0229.0194.0123.0104.082.0189.0117.0144.0NANANA127.0NANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:ShortTermInvestments ▇▄▅▅▅▅█▇▇▄▄▄▅▄▃▆▄▄▃▂▃▂▁▂▅▁▄▅▆▄▅▄▆▄▅▃▅▅▄▅▆▄▆1087.0701.0851.0858.0821.0933.01268.01142.01159.0727.0729.0738.0911.0751.0627.0949.0678.0689.0590.0528.0585.0459.0396.0522.0834.0349.0767.0837.0979.0720.0904.0761.0943.0729.0817.0564.0919.784903.363734.046873.2681070.401768.4631031.578NANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
 us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures us-gaap:ConsolidatedEntities srt:ParentCompanyNANA6432.0NANANA6450.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:Goodwill NANA117.0NANANA117.0NANANA0.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:FiniteLivedIntangibleAssetsNet NANA64.0NANANA77.0NANANA2.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:IntangibleAssetsNetIncludingGoodwill ▁▂▅▆▇▇█181.0184.0203.0206.0209.0212.0216.0NANANA24.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OperatingLeaseRightOfUseAsset NANA78.0NANANA100.065.066.067.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:LongTermDebt █▄▄▄▄▄▄▄▄▄▄▄▄▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▁▁▁▁▁▁▁▁▃▃▃▃▃▃1720.01225.01224.01223.01222.01221.01235.01234.01233.01232.01233.01249.01264.01281.01292.01292.01294.01307.01306.01304.01303.01302.01300.01306.01305.01304.01303.01303.01311.0812.0816.0819.0827.0832.0836.0840.0846.3541034.6671038.3021041.6531046.3821049.7081052.936NANA
us-gaap:MinorityInterest █▇▇█▇▅▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁49.042.041.047.045.025.06.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0NANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo NANA20.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree NANA20.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour NANA11.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive NANA9.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive NANA55.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:StockholdersEquity ▇▇▇▇▇▆▇▇██▇▇▇████▇▇▇▆▆▆▅▅▅▅▄▄▄▄▃▂▃▃▃▃▂▃▃▁6503.06430.06643.06549.06444.06240.06639.06652.06722.06669.06555.06583.06634.06784.06839.06878.06750.06637.06504.06640.06250.06113.06063.05819.05806.05786.05758.05354.05242.05209.05115.04834.04484.04724.04994.04952.04724.0664182.5184651.5654766.7153950.0NA3798.764NANA
us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest ▇▇▇▇▇▆▇▇▇▇▇▇▇████▇▇▇▆▅▅▄▄▄▄▃▂▂▂▁6552.06472.06684.06596.06489.06265.06645.06652.06722.06669.06555.06583.06634.06784.06839.06878.06750.06637.06504.06640.06250.06113.06063.05819.05806.05786.05758.05354.05242.05209.05115.04834.0NANANANANANA4718.436NA3949.9853894.4913798.764NANA
us-gaap:CommonStockValue ▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁████████████▇▇▇▇▇▇1.01.01.01.01.01.01.01.01.01.01.01.01.01.01.01.01.01.01.01.01.01.01.01.01.02.02.02.02.02.02.02.02.02.02.02.01.9391.8251.8221.8221.8421.841.837NANA
us-gaap:RetainedEarningsAccumulatedDeficit ██████████████▇▇▇▇▇▆▆▅▅▅▅▄▄▃▃▃▃▂▂▂▂▂▂▁▂▂▁▁▁6056.06055.06143.06143.06109.06100.06295.06331.06425.06406.06374.06303.06159.06102.05892.05913.05722.05588.05289.05110.04648.04519.04478.04066.03955.03676.03494.02979.02643.02504.02482.02151.01786.01586.01749.01693.01568.3971208.381774.7931866.6641149.8981215.9121098.859NANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▇▆▇▆▅▂▅▅▄▄▁▁▂▃▆▅▅▃▂▅▆▅▃▄▃▆▆▅▅▄▂▃▃▇██▆▆▅▅▃▁▂445.0373.0498.0404.0333.0138.0342.0319.0295.0261.093.078.0152.0214.0372.0326.0315.0206.0149.0358.0383.0319.0237.0273.0239.0370.0370.0333.0332.0264.0160.0206.0209.0447.0515.0531.0429.342398.387367.499327.061205.59185.542110.645NANA
us-gaap:MinorityInterest █▇▇█▇▅▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁49.042.041.047.045.025.06.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0NANANANANANANANANANANANANA
us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders ▁▂█▁▅3.06.026.03.016.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:NetCashProvidedByUsedInOperatingActivities ▁▁▃▃▃▃▄▃▆▂▆▄█▅▅▆▆▆▅▄▅▄▅▄▅▅▇▆▆▆-483.0-466.0-189.0-219.0-281.0-164.0-144.0-167.0134.0-332.0110.0-92.0417.027.079.0156.096.0102.049.0-143.043.0-90.0-13.0-144.082.023.0230.0125.0121.0101.0NANANANANANANANA74.619-13.434772.592-158.158208.29145.289-12.999
us-gaap:NetCashProvidedByUsedInInvestingActivities ▂▄▃▅▅▅▄▆▄▆▄▅▃▄▄▃▅▅▄▅▆▅▅▅▁█▄▅▂▅▄▄▅▅▄▆▅▄▅▅▂▆▄▄▅-381.0125.0-118.0173.0344.0389.099.0439.0139.0492.0103.0208.0-140.0126.0113.0-129.0150.0211.0143.0156.0605.0172.0360.0335.0-702.01001.0-17.0150.0-504.0275.0111.098.0235.0237.0141.0528.6166.4107.0203.449300.741-345.172402.331-29.812101.822258.687
us-gaap:NetCashProvidedByUsedInFinancingActivities █▆▅▄▅▃▄▃▃▃▃▃▃▃▃▃▃▂▃▃▁▃▃▃▃▃▃▂▅▂814.0389.0195.0-21.0189.0-180.0-6.0-235.0-201.0-142.0-189.0-222.0-203.0-181.0-121.0-157.0-194.0-294.0-171.0-104.0-567.0-136.0-245.0-198.0-192.0-212.0-217.0-295.0269.0-342.0NANANANANANANANA-235.155-274.983-365.506-257.311-166.434-251.48-236.112
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect ▂▄▁▂█▄▂▄▄▃▄▁-50.048.0-108.0-67.0252.038.0-46.035.071.019.022.0-107.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:NetCashProvidedByUsedInOperatingActivities ▁▁▃▃▃▃▄▃▆▂▆▄█▅▅▆▆▆▅▄▅▄▅▄▅▅▇▆▆▆-483.0-466.0-189.0-219.0-281.0-164.0-144.0-167.0134.0-332.0110.0-92.0417.027.079.0156.096.0102.049.0-143.043.0-90.0-13.0-144.082.023.0230.0125.0121.0101.0NANANANANANANANA74.619-13.434772.592-158.158208.29145.289-12.999
us-gaap:NetIncomeLoss ▄▃▄▃▄▂▄▃▄▃▃▄▃▅▃▅▄▆▅▇▄▃▇▄▆▅█▆▄▃▆▆▅▁98.011.0148.086.0183.0-55.0137.069.0142.054.088.0161.075.0197.052.0208.0153.0317.0197.0479.0146.059.0429.0129.0297.0201.0532.0355.0159.042.0349.0384.0219.0-144.0NANANANANANA-57.7NANANA203.5
us-gaap:ProfitLoss ▄▄▅▄▅▃▄▄▅▄▄▅▄▅▄▅▅▆▅▆▅▄▆▄▅▅▇▆▅▄▆▆▅▃▄▅▆▁▃█▃▄▃▅▅102.015.0149.089.0188.0-58.0136.069.0142.054.088.0161.075.0197.052.0208.0153.0317.0197.0479.0146.059.0429.0129.0297.0201.0532.0355.0159.042.0349.0384.0219.0-144.074.0142.0377.0-483.0-83.6761.2-57.667125.407-183.5164.6203.538
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:NetCashProvidedByUsedInInvestingActivities ▂▄▃▅▅▅▄▆▄▆▄▅▃▄▄▃▅▅▄▅▆▅▅▅▁█▄▅▂▅▄▄▅▅▄▆▅▄▅▅▂▆▄▄▅-381.0125.0-118.0173.0344.0389.099.0439.0139.0492.0103.0208.0-140.0126.0113.0-129.0150.0211.0143.0156.0605.0172.0360.0335.0-702.01001.0-17.0150.0-504.0275.0111.098.0235.0237.0141.0528.6166.4107.0203.449300.741-345.172402.331-29.812101.822258.687
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:NetCashProvidedByUsedInFinancingActivities █▆▅▄▅▃▄▃▃▃▃▃▃▃▃▃▃▂▃▃▁▃▃▃▃▃▃▂▅▂814.0389.0195.0-21.0189.0-180.0-6.0-235.0-201.0-142.0-189.0-222.0-203.0-181.0-121.0-157.0-194.0-294.0-171.0-104.0-567.0-136.0-245.0-198.0-192.0-212.0-217.0-295.0269.0-342.0NANANANANANANANA-235.155-274.983-365.506-257.311-166.434-251.48-236.112
us-gaap:RepaymentsOfLongTermDebt NANA0.00.01.021.00.00.01.03.028.049.05.019.01.023.05.01.00.01.01.00.01.01.01.01.01.011.01.06.0NANANANANANANANANANANANANANANA
 us-gaap:RepaymentsOfLongTermDebt dei:LegalEntity,us-gaap:DebtInstrument,us-gaap:LongtermDebtType,us-gaap:SubsequentEventType ago:AssuredGuarantyMunicipalHoldingsInc,ago:NotesPayable625Percent,us-gaap:NotesPayableOtherPayables,us-gaap:SubsequentEventNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RepaymentsOfLongTermDebt dei:LegalEntity,us-gaap:DebtInstrument,us-gaap:LongtermDebtType,us-gaap:SubsequentEventType ago:AssuredGuarantyMunicipalHoldingsInc,ago:Quibs6875Percent,us-gaap:CorporateDebtSecurities,us-gaap:SubsequentEventNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RepaymentsOfLongTermDebt dei:LegalEntity,us-gaap:SubsequentEventType ago:AssuredGuarantyMunicipalHoldingsInc,us-gaap:SubsequentEventNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:PaymentsOfDividendsCommonStock ▆▇▆▆▆█▇▆▇█▆▇▇▇▆▆▆▇▆▆▆▇▆▇▇▇▇▇██▇▇▇▇▇▇▆▆▁▁▁▁▁▁▁17.018.016.016.017.020.018.017.019.020.016.018.019.018.017.017.017.019.017.017.017.018.017.018.018.019.018.018.020.020.018.019.019.019.018.018.12216.45316.4258.2058.2538.2918.2868.3018.2768.308
us-gaap:PaymentsForRepurchaseOfCommonStock ▄▃▅▂▆▅▆▆▄▃▅▅▆▄▃▃▅█▅▃▃▃▅▅▅▆▆█▆▂▁▁▇▂▁▁▂▁▁▂88.077.0126.040.0164.0116.0160.0150.0110.080.0120.0130.0150.0100.070.080.0135.0216.0116.055.060.075.0135.0135.0133.0152.0152.0226.0177.035.05.015.0205.039.00.0-0.31324.3130.00.023.311NANA0.00.0NA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.02000000.02000000.02000000.02000000.02000000.02000000.02000000.02000000.02000000.02000000.02000000.01939000.01825000.01822000.01822000.01842000.01840000.01837000.01842000.0
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value767783879298101104109112116120122127132134137146151156169179183183188193194187182184184187187188
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value757683869298101103108111115118121125131134136145150155168178182182187193194186182183184183183184
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount


Antidilutive
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value0.30.50.61.70.00.10.00.00.10.20.00.10.10.00.60.81.30.10.71.91.51.51.92.05.13.913183.59.64.94.72.7
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount100.0100.0100.0100.00.0100.00.00.0100.0100.00.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareBasic


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1.310.141.771.032.11-0.591.430.711.40.520.841.480.671.710.441.751.262.531.513.631.090.433.050.881.971.293.32.10.890.231.912.11.17-0.740.380.732.02-2.65-0.464.15-0.310.68-1.00.891.11.74
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted

us-gaap:EarningsPerShareDiluted


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1.290.141.761.022.1-0.591.420.71.390.520.831.470.671.680.441.721.242.491.493.61.090.433.030.881.961.283.282.090.890.231.92.091.16-0.740.380.732.01-2.65-0.464.13-0.310.67-1.00.881.081.69
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Benefits Losses And Expenses

us-gaap:BenefitsLossesAndExpenses

us-gaap:BenefitsLossesAndExpenses


Benefits
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value10517122919615015415912085139113991347612531015815519986195180191196286103165371351261601341363613416320533822528921561191195153230
Percentage of BenefitsLossesAndExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating150.0240.8331.9268.5187.5187.8187.1133.375.9139.0110.899.0131.473.8127.6303.9153.4125.0165.889.6195.0178.2164.7171.9286.0100.0157.135.6137.8120.0146.8132.7143.237.5127.6156.7198.1337.9221.6300.9209.261.9199.8222.5165.40.0

us-gaap:BenefitsLossesAndExpenses us-gaap:ConsolidationItems

us-gaap:OperatingSegments


Benefits
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value22919615015415912085139
Percentage of BenefitsLossesAndExpenses100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating331.9268.5187.5187.8187.1133.375.9139.0
Percentage of InterestAndDividendIncomeOperating us-gaap:OperatingSegments0.00.00.00.00.00.00.00.0

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value170-114.0242157378-259.016093176222-452.136-43.17188276113-355.166310230
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating242.9-160.6350.7215.1472.5-315.9188.2103.3157.1222.0-451.7-42.4918.474.4113.7-370.7353.2248.5

Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-06-302019-03-31
Value4000000.04000000.01000000.03000000.05000000.0-3000000.000
Percentage of ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.00.00.0
Percentage of InterestAndDividendIncomeOperating5.75.61.44.16.2-3.70.00.0

Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-06-302010-03-31
Value174-110.0243160383-262.01599317622210387137142219262374-12.0454210141393163166201569356227146303381-19.0-212.058243407-452.0-40.6388262100254320
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating248.6-154.9352.2219.2478.7-319.5187.1103.3157.1222.0101.087.012.768.942.9214.7254.4301.6-10.0472.9210.0139.6338.8143.0166.0195.1541.9342.3231.6139.0278.0377.2-20.0-220.855.2233.7392.2-451.5-39.9917.860.5100.2274.80.0

Deferred Policy Acquisition Cost Amortization Expense

us-gaap:DeferredPolicyAcquisitionCostAmortizationExpense

us-gaap:DeferredPolicyAcquisitionCostAmortizationExpense


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value4.03.05.04.04.03.05.03.04.06.04.03.04.05.06.05.04.04.05.04.05.04.05.05.06.04.0134.03.05.04.04.01.03.00.04.04.5265.4136.77.2789.5337.42118.0236.9368.173
Percentage of DeferredPolicyAcquisitionCostAmortizationExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating5.74.27.25.55.03.75.93.33.66.03.93.03.94.96.14.93.93.24.24.25.04.04.34.46.03.912.43.83.14.83.74.01.13.10.03.84.45.46.67.69.27.411.59.17.50.0

Gains Losses On Extinguishment Of Debt

us-gaap:GainsLossesOnExtinguishmentOfDebt dei:LegalEntity, us-gaap:StatementScenario

us-gaap:GainsLossesOnExtinguishmentOfDebt

ago:AssuredGuarantyMunicipalHoldingsInc, srt:ScenarioForecast


Gains
Period End2021-09-30
Value-66000000.0
Percentage of GainsLossesOnExtinguishmentOfDebt100.0
Percentage of InterestAndDividendIncomeOperating0.0
Percentage of InterestAndDividendIncomeOperating ago:AssuredGuarantyMunicipalHoldingsInc srt:ScenarioForecast0.0

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

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1251517479222-62.0138861825810117587217
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating178.621.1252.2108.2277.5-75.6162.495.6162.558.099.0175.085.3210.7

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value3.0-4.01.0173.0-7.09.01416-14.0-21.0-9.02.0-8.0-12.07.010.06.0189.0-17.0341510.03.0
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest2.4-26.70.621.51.411.36.516.38.8-24.1-20.8-5.12.3-3.70.00.00.00.00.00.00.00.00.00.00.0
Percentage of InterestAndDividendIncomeOperating4.3-5.61.423.33.8-8.510.615.614.3-14.0-20.6-9.02.0-7.8-12.26.99.95.215.89.0-16.532.414.410.22.9
Percentage of InterestAndDividendIncomeOperating us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedGainLossFinancialLiabilityFairValueOptionAttributableToParent


Income
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-1.0-1.04.0-1.0-2.0-2.0-3.0-8.0-2.0-3.0-2.01.03.0
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest-0.8-6.75.1-0.53.2-1.4-3.5-4.4-3.4-3.0-1.11.11.4
Percentage of InterestAndDividendIncomeOperating-1.4-1.45.5-1.2-2.4-2.4-3.3-7.1-2.0-2.9-2.01.02.9
Percentage of InterestAndDividendIncomeOperating us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedGainLossFinancialLiabilityFairValueOptionAttributableToParent0.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Income
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value4.04.08.0126.01129133.01.01.01.0-6.01.0-24.0-6.0-69.0-3.0-3.0-13.0-7.0-2.01.01.0-20.0-3.0-5.0-2.0-2.0
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest3.22.310.15.4-9.78.033.77.15.21.00.61.1-2.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of InterestAndDividendIncomeOperating5.75.811.015.07.312.932.211.63.01.01.01.0-5.81.0-23.5-5.8-55.6-2.5-3.1-13.0-6.9-1.70.91.0-19.4-2.9-4.8-2.0-1.9
Percentage of InterestAndDividendIncomeOperating us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedOtherThanTemporaryImpairment


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value0.0-3.0-2.05.0-8.0-11.0-1.0-12.011-15.0-19.0-8.00.0111217-8.09.0274.04.0178.0178.04.03720125.0
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest0.0-20.0-1.16.3-3.617.7-0.7-14.06.0-25.9-18.8-4.60.05.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of InterestAndDividendIncomeOperating0.0-4.2-2.96.8-10.0-13.4-1.2-13.39.8-15.0-18.6-8.00.010.712.216.7-7.87.322.54.24.016.86.914.98.03.935.219.212.24.8
Percentage of InterestAndDividendIncomeOperating us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedOtherThanTemporaryImpairment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value916.015072222-58.01378618156101175872171563131503722714802016558417240926675648821869489536329-212.095179553-695.619-146.81056-113.633192-312.6151294436
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating130.08.5217.498.6277.5-70.7161.295.6161.656.099.0175.085.3210.7159.2306.9145.6300.0225.8500.0201.064.4503.4150.9409.0258.3720.0469.2222.465.7448.6530.7346.3-220.890.5172.1532.9-694.9-144.21098.9-110.2191.9-326.3172.3318.00.0

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments us-gaap:ConsolidatedEntities

us-gaap:VariableInterestEntityPrimaryBeneficiary


Income
Period End2020-09-302020-06-302019-09-302019-06-30
Value-1.05.0-2.07.0
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments-1.42.3-2.33.9
Percentage of InterestAndDividendIncomeOperating-1.46.2-2.26.2
Percentage of InterestAndDividendIncomeOperating us-gaap:VariableInterestEntityPrimaryBeneficiary0.00.00.00.0

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:FinancialGuarantyVariableInterestEntitiesAndConsolidatedInvestmentVehicles


Income
Period End2021-06-302021-03-312020-06-302020-03-31
Value9.04.05.0-8.0
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments9.966.72.313.8
Percentage of InterestAndDividendIncomeOperating12.95.66.2-9.8
Percentage of InterestAndDividendIncomeOperating us-gaap:VariableInterestEntityPrimaryBeneficiary ago:FinancialGuarantyVariableInterestEntitiesAndConsolidatedInvestmentVehicles0.00.00.00.0

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments us-gaap:StatutoryAccountingPracticesByJurisdiction

ago:OtherCountries


Income
Period End2021-06-302021-03-312020-06-302020-03-31
Value0.0-2.0-1.0-2.0
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments0.0-33.3-0.53.4
Percentage of InterestAndDividendIncomeOperating0.0-2.8-1.2-2.4
Percentage of InterestAndDividendIncomeOperating ago:OtherCountries0.00.00.00.0

country:BM


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-06-302013-03-312012-06-302012-03-31
Value162015-14.022-7.07.010.00.016242424492.0-18.02813338561517110125.050857618-37.0-24.0-78.08.0-128.0
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments17.6333.310.0-19.49.912.15.111.60.028.623.813.727.622.61.3-5.818.735.814.011.77.526.218.87.01.218.811.215.68.3-53.6-7.336.81.418.4
Percentage of InterestAndDividendIncomeOperating22.928.221.7-19.227.5-8.58.211.10.016.023.524.023.547.62.0-17.627.2107.331.758.315.016.894.810.55.048.581.073.118.4-35.2-25.3-81.27.7-127.9
Percentage of InterestAndDividendIncomeOperating country:BM0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

country:GB


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-06-302013-03-312012-06-302012-03-31
Value3.01.019212.0-29.018-25.0-8.07.0-9.023-8.0-7.0-6.0-6.0-8.0-7.0-7.0-8.0-8.0-7.0-7.0-6.0-10.0-7.0-8.0-7.0-9.0-7.00.00.00.00.0
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments3.316.712.729.20.950.013.1-29.1-4.412.5-8.913.1-9.2-3.2-3.8-1.9-5.3-1.9-2.6-1.7-4.0-10.8-1.2-3.5-2.4-2.6-1.1-1.4-4.1-10.10.0-0.00.0-0.0
Percentage of InterestAndDividendIncomeOperating4.31.427.528.82.5-35.421.2-27.8-7.17.0-8.823.0-7.8-6.8-6.1-5.9-7.8-5.6-5.8-8.3-8.0-6.9-6.0-5.3-10.0-6.8-7.6-6.7-9.2-6.70.00.00.00.0
Percentage of InterestAndDividendIncomeOperating country:GB0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

country:US


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-06-302013-03-312012-06-302012-03-31
Value106-4.014172198-26.011410119035871287117516033713024624043219455481166414223679419209113353-134.0546-568.0
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments116.5-66.794.0100.089.244.883.2117.4105.062.586.173.181.680.6102.6107.786.766.188.690.096.584.682.496.5101.283.889.885.995.9163.8107.363.298.681.7
Percentage of InterestAndDividendIncomeOperating151.4-5.6204.398.6247.5-31.7134.1112.2169.635.085.3128.069.6169.9163.3330.4126.2198.4200.0450.0194.054.5414.7145.6414.0216.5646.7402.9213.3107.6371.6-139.6525.5-567.4
Percentage of InterestAndDividendIncomeOperating country:US0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxExpenseBenefit


Income
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value2325-10.034-4.02.017404.013141220104105-3.055741.0556.015543112652241335927140152110-68.02137177-212.595-63.2294-55.96666-129.1-12.94890114
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating32.936.2-13.742.5-4.92.418.935.74.012.714.011.819.4106.1102.9-2.944.461.71.055.05.9133.637.7112.063.1213.3127.960.225.7128.4150.5115.8-70.820.035.6170.5-212.4-62.1306.9-54.366.6-134.8-14.798.20.0

us-gaap:IncomeTaxExpenseBenefit us-gaap:ConsolidatedEntities

us-gaap:VariableInterestEntityPrimaryBeneficiary


Income
Period End2020-09-302020-06-302019-09-302019-06-30
Value-1.00.00.01.0
Percentage of IncomeTaxExpenseBenefit10.00.00.02.5
Percentage of InterestAndDividendIncomeOperating-1.40.00.00.9
Percentage of InterestAndDividendIncomeOperating us-gaap:VariableInterestEntityPrimaryBeneficiary0.00.00.00.0

us-gaap:IncomeTaxExpenseBenefit us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:FinancialGuarantyVariableInterestEntitiesAndConsolidatedInvestmentVehicles


Income
Period End2021-06-302020-06-302020-03-31
Value1.00.0-1.0
Percentage of IncomeTaxExpenseBenefit4.30.025.0
Percentage of InterestAndDividendIncomeOperating1.40.0-1.2
Percentage of InterestAndDividendIncomeOperating us-gaap:VariableInterestEntityPrimaryBeneficiary ago:FinancialGuarantyVariableInterestEntitiesAndConsolidatedInvestmentVehicles0.00.00.0

us-gaap:IncomeTaxExpenseBenefit us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value0.0-1.00.03.01.0-3.01.04.03.0-2.0-5.00.00.0-3.0-5.03.04.03.06.04.0-6.0115.03.02.0
Percentage of IncomeTaxExpenseBenefit0.00.00.0-30.02.975.050.023.57.5-50.0-38.50.00.0-15.0-4.82.966.71.914.03.6-9.24.93.85.17.4
Percentage of InterestAndDividendIncomeOperating0.0-1.40.04.11.2-3.71.24.42.7-2.0-4.90.00.0-2.9-5.12.94.02.65.34.0-5.810.54.83.11.9
Percentage of InterestAndDividendIncomeOperating us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:IncomeTaxExpenseBenefit us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedGainLossFinancialLiabilityFairValueOptionAttributableToParent


Income
Period End2021-06-302020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-1.01.00.0-1.00.0-1.0-2.00.0-1.00.00.01.0
Percentage of IncomeTaxExpenseBenefit-4.3-10.00.025.00.0-5.9-5.00.0-7.70.00.05.0
Percentage of InterestAndDividendIncomeOperating-1.41.40.0-1.20.0-1.1-1.80.0-1.00.00.01.0
Percentage of InterestAndDividendIncomeOperating us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedGainLossFinancialLiabilityFairValueOptionAttributableToParent0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Income
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value1.00.01.03.00.02.05.02.01.0-1.01.00.00.01.0-9.0-2.0-24.0-1.00.0-5.0-2.00.00.01.0-7.0-1.0-2.0-1.0-1.0
Percentage of IncomeTaxExpenseBenefit4.30.0-10.08.8-0.0100.029.45.025.0-7.77.10.00.01.0-8.666.7-43.6-1.40.0-9.1-33.30.00.00.9-10.8-0.4-1.5-1.7-3.7
Percentage of InterestAndDividendIncomeOperating1.40.01.43.80.02.45.61.81.0-1.01.00.00.01.0-8.8-1.9-19.4-0.80.0-5.0-2.00.00.01.0-6.8-1.0-1.9-1.0-1.0
Percentage of InterestAndDividendIncomeOperating us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedOtherThanTemporaryImpairment


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value0.0-1.00.01.0-2.0-2.0-1.00.03.0-3.0-3.0-1.00.02.04.06.0-3.03.010.01.01.06.03.06.03.01.0137.04.02.0
Percentage of IncomeTaxExpenseBenefit0.00.00.0-10.0-5.950.0-50.00.07.5-75.0-23.1-7.10.010.03.85.7100.05.513.5100.01.8100.01.914.02.71.55.85.36.87.4
Percentage of InterestAndDividendIncomeOperating0.0-1.40.01.4-2.5-2.4-1.20.02.7-3.0-2.9-1.00.01.94.15.9-2.92.48.31.01.05.92.65.33.01.012.46.74.11.9
Percentage of InterestAndDividendIncomeOperating us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedOtherThanTemporaryImpairment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Interest Expense

us-gaap:InterestExpense

us-gaap:InterestExpense


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value23212121212222222223232324242424252425262526252526252527202019212121212125242424242424242425
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating32.929.630.428.826.226.825.924.419.623.022.523.023.523.324.523.524.319.420.827.125.025.721.621.926.024.323.826.020.419.017.420.822.121.920.020.224.524.624.326.024.024.725.828.326.80.0

us-gaap:InterestExpense us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Interest
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value2324232525232224
Percentage of InterestExpense109.5114.3109.5113.6113.6104.5100.0104.3
Percentage of InterestAndDividendIncomeOperating33.332.928.730.529.425.619.624.0
Percentage of InterestAndDividendIncomeOperating us-gaap:CorporateNonSegment0.00.00.00.00.00.00.00.0

us-gaap:MaterialReconcilingItems


Interest
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-2.0-3.0-2.0-3.0-3.0-1.00.0-1.0
Percentage of InterestExpense-9.5-14.3-9.5-13.6-13.6-4.50.0-4.3
Percentage of InterestAndDividendIncomeOperating-2.9-4.1-2.5-3.7-3.5-1.10.0-1.0
Percentage of InterestAndDividendIncomeOperating us-gaap:MaterialReconcilingItems0.00.00.00.00.00.00.00.0

Interest Paid Net

us-gaap:InterestPaidNet

us-gaap:InterestPaidNet


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value328.0328.0329.0339.0339.0339.03621248.0378.0407.0417.0407.0417.0419.0288.0299.0299.0299.21334123312331231133212
Percentage of InterestPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating45.711.346.411.040.011.038.810.029.59.032.49.035.320.424.57.835.96.533.37.341.06.934.56.141.06.839.08.728.67.626.68.930.59.427.68.933.412.132.912.932.512.233.115.135.30.0

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312011-06-302010-06-30
Value981114886183-55.013769142548816175197522081533171974791465942912929720153235515942349384219-144.0-57.7203
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating140.015.5214.5117.8228.8-67.1161.276.7126.854.086.3161.073.5191.353.1203.9148.5255.6164.2499.0146.058.4369.8113.2297.0195.1506.7341.3162.240.0320.2380.2230.5-150.0-56.0219.8

us-gaap:NetIncomeLoss us-gaap:ConsolidatedEntities

us-gaap:VariableInterestEntityPrimaryBeneficiary


Net
Period End2020-09-302020-06-302019-09-302019-06-30
Value-3.00.0-2.06.0
Percentage of NetIncomeLoss-3.50.0-2.94.2
Percentage of InterestAndDividendIncomeOperating-4.10.0-2.25.4
Percentage of InterestAndDividendIncomeOperating us-gaap:VariableInterestEntityPrimaryBeneficiary0.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:FinancialGuarantyVariableInterestEntitiesAndConsolidatedInvestmentVehicles


Net
Period End2021-06-302020-06-302020-03-31
Value4.00.0-4.0
Percentage of NetIncomeLoss4.10.07.3
Percentage of InterestAndDividendIncomeOperating5.70.0-4.9
Percentage of InterestAndDividendIncomeOperating us-gaap:VariableInterestEntityPrimaryBeneficiary ago:FinancialGuarantyVariableInterestEntitiesAndConsolidatedInvestmentVehicles0.00.00.0

Net Income Loss Attributable To Noncontrolling Interest

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value4.04.01.03.05.0-3.0-1.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of NetIncomeLossAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of InterestAndDividendIncomeOperating5.75.61.44.16.2-3.7-1.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest us-gaap:ConsolidatedEntities

us-gaap:VariableInterestEntityPrimaryBeneficiary


Net
Period End2020-09-302020-06-302019-06-30
Value3.05.00.0
Percentage of NetIncomeLossAttributableToNoncontrollingInterest100.0100.00.0
Percentage of InterestAndDividendIncomeOperating4.16.20.0
Percentage of InterestAndDividendIncomeOperating us-gaap:VariableInterestEntityPrimaryBeneficiary0.00.00.0

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:FinancialGuarantyVariableInterestEntitiesAndConsolidatedInvestmentVehicles


Net
Period End2021-06-302021-03-312020-06-302020-03-31
Value4.04.05.0-3.0
Percentage of NetIncomeLossAttributableToNoncontrollingInterest100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating5.75.66.2-3.7
Percentage of InterestAndDividendIncomeOperating us-gaap:VariableInterestEntityPrimaryBeneficiary ago:FinancialGuarantyVariableInterestEntitiesAndConsolidatedInvestmentVehicles0.00.00.00.0

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest us-gaap:ConsolidationItems

us-gaap:MaterialReconcilingItems


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-06-302019-03-31
Value4.04.01.03.05.0-3.00.00.0
Percentage of NetIncomeLossAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.00.00.0
Percentage of InterestAndDividendIncomeOperating5.75.61.44.16.2-3.70.00.0
Percentage of InterestAndDividendIncomeOperating us-gaap:MaterialReconcilingItems0.00.00.00.00.00.00.00.0

Net Income Loss Available To Common Stockholders Basic

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value981114786183-55.013669142548816075196522081533171974781465842812929720153235415942349384219-144.074142376-483.024-83.6761-42.6140-183.5164179333
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating140.015.5213.0117.8228.8-67.1160.076.7126.854.086.3160.073.5190.353.1203.9148.5255.6164.2497.9146.057.4369.0113.2297.0195.1506.7340.4162.240.0320.2380.2230.5-150.070.5136.5362.4-482.5-82.1792.0-41.3140.5-191.5187.0193.40.0

Net Income Loss Available To Common Stockholders Diluted

us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted

us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value981114786183-55.013669142548816075196522081533171974781465842812929720153235415942348384219-144.075142376-482.4-83.6760-57.7139-183.1164203
Percentage of NetIncomeLossAvailableToCommonStockholdersDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating140.015.5213.0117.8228.8-67.1160.076.7126.854.086.3160.073.5190.353.1203.9148.5255.6164.2497.9146.057.4369.0113.2297.0195.1506.7340.4162.240.0319.3380.2230.5-150.071.4136.5361.9-481.9-82.1791.7-56.0139.0-191.1186.7219.5

Net Investment Income

us-gaap:NetInvestmentIncome

us-gaap:NetInvestmentIncome


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value68706871788082881109810098991019699101122117949899112112981011021029610310799939410310210197100931009693859084
Percentage of NetInvestmentIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating97.198.698.697.397.597.696.597.898.298.098.098.097.198.198.097.198.198.497.597.998.098.096.698.298.098.197.198.198.098.198.298.097.997.998.198.197.897.798.597.397.896.398.097.398.10.0

us-gaap:NetInvestmentIncome us-gaap:ConsolidatedEntities

us-gaap:VariableInterestEntityPrimaryBeneficiary


Net
Period End2020-09-302020-06-302019-09-302019-06-30
Value-1.0-2.0-1.0-1.0
Percentage of NetInvestmentIncome-1.4-2.6-1.1-0.9
Percentage of InterestAndDividendIncomeOperating-1.4-2.5-1.1-0.9
Percentage of InterestAndDividendIncomeOperating us-gaap:VariableInterestEntityPrimaryBeneficiary0.00.00.00.0

us-gaap:NetInvestmentIncome us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1.00.00.01.01.01.01.01.0
Percentage of NetInvestmentIncome1.50.00.01.21.21.10.91.0
Percentage of InterestAndDividendIncomeOperating1.40.00.01.21.21.10.91.0
Percentage of InterestAndDividendIncomeOperating us-gaap:CorporateNonSegment0.00.00.00.00.00.00.00.0

us-gaap:MaterialReconcilingItems


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-3.0-4.0-4.0-4.0-4.0-2.0-1.0-2.0
Percentage of NetInvestmentIncome-4.4-5.6-5.1-5.0-4.9-2.3-0.9-2.0
Percentage of InterestAndDividendIncomeOperating-4.3-5.5-5.0-4.9-4.7-2.2-0.9-2.0
Percentage of InterestAndDividendIncomeOperating us-gaap:MaterialReconcilingItems0.00.00.00.00.00.00.00.0

us-gaap:NetInvestmentIncome us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, ago:InsuranceSegment


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value70758283858911099
Percentage of NetInvestmentIncome102.9105.6105.1103.8103.7101.1100.0101.0
Percentage of InterestAndDividendIncomeOperating101.4102.7102.5101.2100.098.998.299.0
Percentage of InterestAndDividendIncomeOperating us-gaap:OperatingSegments ago:InsuranceSegment0.00.00.00.00.00.00.00.0

Other Comprehensive Income Loss Net Of Tax

us-gaap:OtherComprehensiveIncomeLossNetOfTax

us-gaap:OtherComprehensiveIncomeLossNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value72-125.09471195-204.023243416815-74.0-62.0-126.0-10.01182-36.034-131.00.0371.068104
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating102.9-176.1136.297.3243.8-248.827.126.730.4168.014.7-74.0-60.8-122.3-10.210.881.2-31.029.8-131.00.035.21.069.499.0

us-gaap:OtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedGainLossFinancialLiabilityFairValueOptionAttributableToParent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-2.0-1.06.0-4.0-5.010.00.00.04.00.03.0-3.04.0-2.0
Percentage of OtherComprehensiveIncomeLossNetOfTax-2.80.86.4-5.6-2.6-4.90.00.011.80.020.04.1-6.51.6
Percentage of InterestAndDividendIncomeOperating-2.9-1.48.7-5.5-6.212.20.00.03.60.02.9-3.03.9-1.9
Percentage of InterestAndDividendIncomeOperating us-gaap:AccumulatedGainLossFinancialLiabilityFairValueOptionAttributableToParent0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value51-119.08367175-162.018337916335-59.0-63.0-128.0-5.01258-1.0-219.0-36.07690-18.042-136.05.0194-3.0-1.0-1.0-18.0-1.0-10.0-1.0
Percentage of OtherComprehensiveIncomeLossNetOfTax70.895.288.394.489.779.478.3137.5232.497.0233.379.7101.6101.650.0109.10.00.00.00.00.0109.850.0123.5103.80.0524.3-300.0-1.5-1.00.00.00.00.0
Percentage of InterestAndDividendIncomeOperating72.9-167.6120.391.8218.8-197.621.236.770.5163.034.3-59.0-61.8-124.3-5.111.856.3-0.8-182.5-37.576.089.1-15.536.8-136.04.9184.8-2.9-1.0-1.0-16.5-1.0-10.5-1.0
Percentage of InterestAndDividendIncomeOperating us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherThanTemporaryImpairment


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value24-6.03.08.025-52.06.0-9.0-48.05.0-21.0-9.06.0-2.0-4.0-4.041561816-3.0-6.0-15.0-4.0-1.01.04.0138.03.00.04.08.04.0
Percentage of OtherComprehensiveIncomeLossNetOfTax33.34.83.211.312.825.526.1-37.5-141.23.0-140.012.2-9.71.640.0-36.40.00.00.00.00.0-7.341.7-11.80.80.010.81300.011.82.90.00.00.00.0
Percentage of InterestAndDividendIncomeOperating34.3-8.54.311.031.2-63.47.1-10.0-42.95.0-20.6-9.05.9-1.9-4.1-3.939.845.215.016.7-3.0-5.9-12.9-3.5-1.01.03.812.58.22.90.04.08.44.2
Percentage of InterestAndDividendIncomeOperating us-gaap:AccumulatedOtherThanTemporaryImpairment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment


Other
Period End2021-06-302021-03-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-1.01.00.00.00.00.0-1.00.0-2.0-3.0-9.06.00.03.010.02.0-8.0-5.0-8.0-2.0-3.0-4.06.0-5.0-7.00.00.00.00.00.00.00.0
Percentage of OtherComprehensiveIncomeLossNetOfTax-1.4-0.80.0-0.00.00.0-2.90.0-13.34.114.5-4.8-0.027.30.00.00.00.00.0-2.48.3-11.8-4.60.0-18.90.00.00.00.00.00.00.0
Percentage of InterestAndDividendIncomeOperating-1.41.40.00.00.00.0-0.90.0-2.0-3.0-8.85.80.02.99.71.6-6.7-5.2-8.0-2.0-2.6-3.56.0-4.9-6.70.00.00.00.00.00.00.0
Percentage of InterestAndDividendIncomeOperating us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Other Income

us-gaap:OtherIncome

us-gaap:OtherIncome


Other
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value140.05.02.07.0-8.0-9.0258.0-5.014-44.0139.02742289-10.0-3.01834-6.0-3.055-9.0-3.0-11.07.021-5.016-7.0-14.0-4.0164.45890-1.0-7.5528423233-13.396-12.929
Percentage of OtherIncome100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating20.00.06.82.58.5-9.4-10.022.38.0-4.914.0-43.112.69.2268.621.471.8-8.3-3.118.033.7-5.2-2.655.0-8.7-2.9-10.67.120.0-4.615.8-7.4-14.6-3.815.44.390.9-1.0-7.927.942.134.138.3-14.50.0

Other Nonoperating Income Expense

us-gaap:OtherNonoperatingIncomeExpense us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass

us-gaap:OtherNonoperatingIncomeExpense

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:FinancialGuarantyVariableInterestEntitiesAndConsolidatedInvestmentVehicles


Other
Period End2021-06-302020-06-30
Value-6000000.0-1000000.0
Percentage of OtherNonoperatingIncomeExpense100.0100.0
Percentage of InterestAndDividendIncomeOperating-8.6-1.2
Percentage of InterestAndDividendIncomeOperating us-gaap:VariableInterestEntityPrimaryBeneficiary ago:FinancialGuarantyVariableInterestEntitiesAndConsolidatedInvestmentVehicles0.00.0

Policyholder Benefits And Claims Incurred Net

us-gaap:PolicyholderBenefitsAndClaimsIncurredNet

us-gaap:PolicyholderBenefitsAndClaimsIncurredNet


Policyholder
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-16.030737337201830-1.046211744-18.0342237259112-9.0102901061121881872-44.05741855562-48.06490122246148214132-27.04710411071130
Percentage of PolicyholderBenefitsAndClaimsIncurredNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating-22.942.3105.8100.046.224.421.233.3-0.946.020.617.043.1-17.534.7218.669.947.693.3-9.4102.089.191.498.2188.017.568.6-42.358.239.078.054.565.3-50.061.086.5117.8246.6146.0223.7128.9-27.0109.4125.976.80.0

Premiums Earned Net

us-gaap:PremiumsEarnedNet

us-gaap:PremiumsEarnedNet


Premiums
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value102103154107121103123123112118125142136145178186162164236231214183192213219142158144136132182159163248218222219193225211230254286288292314
Percentage of PremiumsEarnedNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating145.7145.1223.2146.6151.2125.6144.7136.7100.0118.0122.5142.0133.3140.8181.6182.4157.3132.3196.7240.6214.0181.2165.5186.8219.0137.9150.5138.5138.8125.7167.0157.4171.6258.3207.6213.5211.1193.5221.0219.6223.2253.7298.9328.1315.50.0

us-gaap:PremiumsEarnedNet us-gaap:ConsolidatedEntities

us-gaap:VariableInterestEntityPrimaryBeneficiary


Premiums
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1.01.0-1.0-2.0-1.01.0-2.0-2.0-11.03.0
Percentage of PremiumsEarnedNet1.01.0-0.6-1.9-0.81.0-1.6-1.6-9.82.5
Percentage of InterestAndDividendIncomeOperating1.41.4-1.4-2.7-1.21.2-2.4-2.2-9.83.0
Percentage of InterestAndDividendIncomeOperating us-gaap:VariableInterestEntityPrimaryBeneficiary0.00.00.00.00.00.00.00.00.00.0

Profit Loss

us-gaap:ProfitLoss

us-gaap:ProfitLoss


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1021514989188-58.013669142548816175197522081533171974791465942912929720153235515942349384219-144.074142377-483.0-83.6761-57.667125-183.5164203321
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating145.721.1215.9121.9235.0-70.7160.076.7126.854.086.3161.073.5191.353.1203.9148.5255.6164.2499.0146.058.4369.8113.2297.0195.1506.7341.3162.240.0320.2380.2230.5-150.070.5136.5362.8-482.5-82.1792.1-55.9125.3-191.5187.0219.80.0

us-gaap:ProfitLoss us-gaap:ConsolidatedEntities

us-gaap:VariableInterestEntityPrimaryBeneficiary


Profit
Period End2020-09-302020-06-302019-09-302019-06-30
Value0.05.0-2.06.0
Percentage of ProfitLoss0.02.7-2.94.2
Percentage of InterestAndDividendIncomeOperating0.06.2-2.25.4
Percentage of InterestAndDividendIncomeOperating us-gaap:VariableInterestEntityPrimaryBeneficiary0.00.00.00.0

us-gaap:ProfitLoss us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:FinancialGuarantyVariableInterestEntitiesAndConsolidatedInvestmentVehicles


Profit
Period End2021-06-302021-03-312020-06-302020-03-31
Value8.04.05.0-7.0
Percentage of ProfitLoss7.826.72.712.1
Percentage of InterestAndDividendIncomeOperating11.45.66.2-8.5
Percentage of InterestAndDividendIncomeOperating us-gaap:VariableInterestEntityPrimaryBeneficiary ago:FinancialGuarantyVariableInterestEntitiesAndConsolidatedInvestmentVehicles0.00.00.00.0

Realized Investment Gains Losses

us-gaap:RealizedInvestmentGainsLosses

us-gaap:RealizedInvestmentGainsLosses


Realized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value4.0-3.06.0134.0-5.010.0168.0-12.0-18.0-7.0-2.0-5.0-14.07.01532-24.0-2.010.0-13.0-6.0-27.0-9.016-35.0-19.0-8.02.029-7.02.0281.02.0-3.1561.316-4.6-11.085-5.092.806-0.6-2.374-8.4389.413
Percentage of RealizedInvestmentGainsLosses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating5.7-4.28.717.85.0-6.111.817.87.1-12.0-17.6-7.0-2.0-4.9-14.36.914.625.8-20.0-2.110.0-12.9-5.2-23.7-9.015.5-33.3-18.3-8.21.926.6-6.92.129.21.01.9-3.01.3-4.5-11.5-4.92.8-0.6-2.7-9.10.0

us-gaap:RealizedInvestmentGainsLosses us-gaap:ConsolidationItems

us-gaap:MaterialReconcilingItems


Realized
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value6.0134.0-5.010.0168.0-12.0
Percentage of RealizedInvestmentGainsLosses100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating8.717.85.0-6.111.817.87.1-12.0
Percentage of InterestAndDividendIncomeOperating us-gaap:MaterialReconcilingItems0.00.00.00.00.00.00.00.0

us-gaap:RealizedInvestmentGainsLosses us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome


Realized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value4.0-3.02.0134.0-5.010.0178.0-12.0-18.0-7.01.0-5.0-13.07.0136.0279.0-16.0341510.03.0
Percentage of RealizedInvestmentGainsLosses100.0100.033.3100.0100.0100.0100.0106.2100.0100.0100.0100.0-50.0100.092.9100.0-100.0-100.0-100.0-100.0-100.0-97.1-78.9-125.0150.0
Percentage of InterestAndDividendIncomeOperating5.7-4.22.917.85.0-6.111.818.97.1-12.0-17.6-7.01.0-4.9-13.36.912.95.223.79.0-15.532.414.410.22.9
Percentage of InterestAndDividendIncomeOperating us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RealizedInvestmentGainsLosses us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Realized
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value4.04.08.0126.01229113.01.01.01.0-6.00.0-24.0-6.0-41.0-3.0-3.0-13.0-4.0-2.010.01.0-20.0-3.0-5.0-2.0-2.0
Percentage of RealizedInvestmentGainsLosses100.066.761.5300.0-120.0120.0181.2137.5-25.0-5.6-14.3-50.0120.0-0.0-342.9-40.0-128.112.5150.0-130.030.833.3-37.0-11.1-125.08.626.325.0-100.0
Percentage of InterestAndDividendIncomeOperating5.75.811.015.07.314.132.29.83.01.01.01.0-5.80.0-23.5-5.8-33.1-2.5-3.1-13.0-4.0-1.78.81.0-19.4-2.9-4.8-2.0-1.9
Percentage of InterestAndDividendIncomeOperating us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedOtherThanTemporaryImpairment


Realized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value0.0-3.0-2.05.0-8.0-11.0-2.0-12.0-3.0-15.0-19.0-8.00.0111317-8.09.0274.04.0178.0178.04.03720125.0
Percentage of RealizedInvestmentGainsLosses0.0100.0-33.338.5-200.0220.0-20.0-75.0-37.5125.0105.6114.3-0.0-220.0-92.9242.9-53.328.1-112.5-200.040.0-130.8-133.3-63.0-88.925.0-105.7-105.3-150.0250.0
Percentage of InterestAndDividendIncomeOperating0.0-4.2-2.96.8-10.0-13.4-2.4-13.3-2.7-15.0-18.6-8.00.010.713.316.7-7.87.322.54.24.016.86.914.98.03.935.219.212.24.8
Percentage of InterestAndDividendIncomeOperating us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedOtherThanTemporaryImpairment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value212429172023220.00.00.0-788.0274221293-1458.0623308527470566396245775368695369921525353195649670465-176.0229342759-357.406781345102254-34.945347447667
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating30.033.842.023.325.028.025.90.00.00.0-772.5274.0216.7284.5-1487.8610.8299.0425.0391.7589.6396.0242.6668.1322.8695.0358.3877.1504.8360.2185.7595.4663.4489.5-183.3218.1328.8731.0-357.077.51399.898.9253.8-36.5394.9483.50.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService

ago:AssetManagementFeesCLOs


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value161817111115
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax76.275.058.664.755.065.2
Percentage of InterestAndDividendIncomeOperating22.925.424.615.113.818.3
Percentage of InterestAndDividendIncomeOperating ago:AssetManagementFeesCLOs0.00.00.00.00.00.0

ago:CollateralizedLoanObligationService


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value111110.04.03.04.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax52.445.834.523.515.017.4
Percentage of InterestAndDividendIncomeOperating15.715.514.55.53.84.9
Percentage of InterestAndDividendIncomeOperating ago:CollateralizedLoanObligationService0.00.00.00.00.00.0

ago:CollateralizedLoanObligationsBeforeRebates


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value1114167.07.010.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax52.458.355.241.235.043.5
Percentage of InterestAndDividendIncomeOperating15.719.723.29.68.812.2
Percentage of InterestAndDividendIncomeOperating ago:CollateralizedLoanObligationsBeforeRebates0.00.00.00.00.00.0

ago:OpportunityFunds


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value4.04.03.01.02.02.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax19.016.710.35.910.08.7
Percentage of InterestAndDividendIncomeOperating5.75.64.31.42.52.4
Percentage of InterestAndDividendIncomeOperating ago:OpportunityFunds0.00.00.00.00.00.0

ago:PerformanceAllocationFees


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value0.01.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.04.20.00.0
Percentage of InterestAndDividendIncomeOperating0.01.40.00.0
Percentage of InterestAndDividendIncomeOperating ago:PerformanceAllocationFees0.00.00.00.0

ago:ReimbursableFundExpense


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value5.05.0126.09.08.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax23.820.841.435.345.034.8
Percentage of InterestAndDividendIncomeOperating7.17.017.48.211.29.8
Percentage of InterestAndDividendIncomeOperating ago:ReimbursableFundExpense0.00.00.00.00.00.0

ago:WinddownFunds


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value1.03.04.06.06.09.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.812.513.835.330.039.1
Percentage of InterestAndDividendIncomeOperating1.44.25.88.27.511.0
Percentage of InterestAndDividendIncomeOperating ago:WinddownFunds0.00.00.00.00.00.0

Revenues

us-gaap:Revenues

us-gaap:Revenues


Revenues
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1961773792683729622206266195214274221293281623308527470566396245775368695369921525353195649670465-176.0229342759-357.406781345102254-34.945347447667
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating280.0249.3549.3367.1465.0117.125.9228.9237.5195.0209.8274.0216.7284.5286.7610.8299.0425.0391.7589.6396.0242.6668.1322.8695.0358.3877.1504.8360.2185.7595.4663.4489.5-183.3218.1328.8731.0-357.077.51399.898.9253.8-36.5394.9483.50.0

us-gaap:Revenues us-gaap:ConsolidationItems

us-gaap:OperatingSegments


Revenuesus-gaap:
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value37926837296296206266195
Percentage of Revenues100.0100.0100.0100.01345.5100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating549.3367.1465.0117.1348.2228.9237.5195.0
Percentage of InterestAndDividendIncomeOperating us-gaap:OperatingSegments0.00.00.00.00.00.00.00.0

us-gaap:Revenues us-gaap:StatutoryAccountingPracticesByJurisdiction

ago:OtherCountries


Revenuesus-gaap:
Period End2021-06-302020-06-302020-03-31
Value1.02.01.0
Percentage of Revenues0.50.51.0
Percentage of InterestAndDividendIncomeOperating1.42.51.2
Percentage of InterestAndDividendIncomeOperating ago:OtherCountries0.00.00.0

country:BM


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-06-302013-03-312012-06-302012-03-31
Value28305735451436374033424736525161475769695942152587873197106611.040-49.079-77.0
Percentage of Revenues14.316.915.013.112.114.6163.618.015.016.919.617.216.317.718.19.815.310.814.712.214.917.119.615.811.219.821.420.217.30.58.627.810.421.5
Percentage of InterestAndDividendIncomeOperating40.042.382.647.956.217.142.441.135.733.041.247.035.350.552.059.845.646.057.571.959.041.6131.050.978.070.9187.6101.962.21.042.1-51.076.0-76.9
Percentage of InterestAndDividendIncomeOperating country:BM0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

country:GB


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-06-302013-03-312012-06-302012-03-31
Value1713243314-11.041-17.0-1.013-4.036-5.0-6.0-8.0-4.0-4.0-4.00.0-2.00.0-2.0-1.0-1.0-1.0-4.0-1.0-1.0-1.0-1.00.00.00.00.0
Percentage of Revenues8.77.36.312.33.8-11.5186.4-8.3-0.46.7-1.913.1-2.3-2.0-2.8-0.6-1.3-0.80.0-0.40.0-0.8-0.1-0.3-0.1-1.1-0.1-0.2-0.3-0.50.0-0.00.0-0.0
Percentage of InterestAndDividendIncomeOperating24.318.334.845.217.5-13.448.2-18.9-0.913.0-3.936.0-4.9-5.8-8.2-3.9-3.9-3.20.0-2.10.0-2.0-0.9-0.9-1.0-3.9-1.0-1.0-1.0-1.00.00.00.00.0
Percentage of InterestAndDividendIncomeOperating country:GB0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

country:US


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-06-302013-03-312012-06-302012-03-31
Value15013428820031393217186227149174191190247238566265474401499337205624311618300725420293195425-127.0676-285.0
Percentage of Revenues76.575.776.074.684.196.9986.490.385.376.481.369.786.084.384.790.986.089.985.388.285.183.780.584.588.981.378.780.083.0100.091.472.289.079.7
Percentage of InterestAndDividendIncomeOperating214.3188.7417.4274.0391.2113.4255.3206.7202.7149.0170.6191.0186.3239.8242.9554.9257.3382.3334.2519.8337.0203.0537.9272.8618.0291.3690.5403.8299.0185.7447.4-132.3650.6-284.7
Percentage of InterestAndDividendIncomeOperating country:US0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Assets

us-gaap:Assets

us-gaap:Assets


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1722616018153341469514780137451432613367135811355113603137391413214019144331464914655146751415114669140921445214544150341547914677149251536915690151061628716354166081729917242175631807418504180911840419238195092047116802
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Assets us-gaap:ConsolidatedEntities

srt:ParentCompany


Assetsus-gaap:
Period End2020-12-312019-12-31
Value66606656
Percentage of Assets43.446.5
Percentage of Assets43.446.5
Percentage of Assets srt:ParentCompany100.0100.0

us-gaap:VariableInterestEntityNotPrimaryBeneficiary


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-31
Value190178204
Percentage of Assets1.11.11.3
Percentage of Assets1.11.11.3
Percentage of Assets us-gaap:VariableInterestEntityNotPrimaryBeneficiary100.0100.0100.0

us-gaap:VariableInterestEntityPrimaryBeneficiary


Assetsus-gaap:
Period End2020-09-302020-06-302020-03-312019-12-31
Value314318368442
Percentage of Assets2.12.22.73.1
Percentage of Assets2.12.22.73.1
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary100.0100.0100.0100.0

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

ago:VotingInterestEntity, us-gaap:Investments, ago:AssetsofConsolidatedInvestmentVehicles


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-31
Value745710.0
Percentage of Assets0.40.40.1
Percentage of Assets0.40.40.1
Percentage of Assets ago:VotingInterestEntity us-gaap:Investments ago:AssetsofConsolidatedInvestmentVehicles100.0100.0100.0

srt:AffiliatedEntity, us-gaap:Investments, ago:AssetsofConsolidatedInvestmentVehicles


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value8.010.010.044539.0
Percentage of Assets0.00.10.10.30.40.1
Percentage of Assets0.00.10.10.30.40.1
Percentage of Assets srt:AffiliatedEntity us-gaap:Investments ago:AssetsofConsolidatedInvestmentVehicles100.0100.0100.0100.0100.0100.0

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:CashandRestrictedCash, ago:CLOInvestments


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value8119317131.012
Percentage of Assets0.51.20.10.10.00.1
Percentage of Assets0.51.20.10.10.00.1
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary ago:CashandRestrictedCash ago:CLOInvestments100.0100.0100.0100.0100.0100.0

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:CashandRestrictedCash, ago:FundInvestments


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value67571171691742.0
Percentage of Assets0.40.40.81.21.20.0
Percentage of Assets0.40.40.81.21.20.0
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary ago:CashandRestrictedCash ago:FundInvestments100.0100.0100.0100.0100.0100.0

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:CorporateLoansofCFEAtFairValue, ago:CLOInvestments


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value254621141291878846494
Percentage of Assets14.813.28.46.05.73.4
Percentage of Assets14.813.28.46.05.73.4
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary ago:CorporateLoansofCFEAtFairValue ago:CLOInvestments100.0100.0100.0100.0100.0100.0

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:DuefromBrokersandCounterparties, ago:CLOInvestments


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-30
Value73591720
Percentage of Assets0.40.40.10.1
Percentage of Assets0.40.40.10.1
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary ago:DuefromBrokersandCounterparties ago:CLOInvestments100.0100.0100.0100.0

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:DuefromBrokersandCounterparties, ago:FundInvestments


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value49533535290.0
Percentage of Assets0.30.30.20.20.20.0
Percentage of Assets0.30.30.20.20.20.0
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary ago:DuefromBrokersandCounterparties ago:FundInvestments100.0100.0100.0100.0100.00.0

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:EquitySecuritiesAndWarrants, ago:FundInvestments


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-31
Value10.010.018
Percentage of Assets0.10.10.1
Percentage of Assets0.10.10.1
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary ago:EquitySecuritiesAndWarrants ago:FundInvestments100.0100.0100.0

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:EquitySecuritiesandWarrants, ago:FundInvestments


Assetsus-gaap:
Period End2020-12-312020-09-302020-06-302019-12-31
Value18435417
Percentage of Assets0.10.30.40.1
Percentage of Assets0.10.30.40.1
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary ago:EquitySecuritiesandWarrants ago:FundInvestments100.0100.0100.0100.0

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:LoansAtFairValueOption, ago:CLOInvestments


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-30
Value443189170175
Percentage of Assets2.61.21.11.2
Percentage of Assets2.61.21.11.2
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary ago:LoansAtFairValueOption ago:CLOInvestments100.0100.0100.0100.0

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:StructuredProducts, ago:FundInvestments


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value53503940430.0
Percentage of Assets0.30.30.30.30.30.0
Percentage of Assets0.30.30.30.30.30.0
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary ago:StructuredProducts ago:FundInvestments100.0100.0100.0100.0100.00.0

us-gaap:VariableInterestEntityPrimaryBeneficiary, us-gaap:DebtSecurities, ago:FundInvestments


Assetsus-gaap:
Period End2020-12-312020-09-302020-06-302019-12-31
Value9.0856347
Percentage of Assets0.10.60.40.3
Percentage of Assets0.10.60.40.3
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary us-gaap:DebtSecurities ago:FundInvestments100.0100.0100.0100.0

us-gaap:VariableInterestEntityPrimaryBeneficiary, us-gaap:ShortTermInvestments, ago:CLOInvestments


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value121136139304030.0
Percentage of Assets0.70.80.90.22.70.0
Percentage of Assets0.70.80.90.22.70.0
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary us-gaap:ShortTermInvestments ago:CLOInvestments100.0100.0100.0100.0100.00.0

us-gaap:VariableInterestEntityPrimaryBeneficiary, us-gaap:USStatesAndPoliticalSubdivisions, ago:FundInvestments


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value103946150390.0
Percentage of Assets0.60.60.40.30.30.0
Percentage of Assets0.60.60.40.30.30.0
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary us-gaap:USStatesAndPoliticalSubdivisions ago:FundInvestments100.0100.0100.0100.0100.00.0

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

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:AssetsofConsolidatedInvestmentVehicles


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value35472956191315391669645572
Percentage of Assets20.618.512.510.511.34.74.0
Percentage of Assets20.618.512.510.511.34.74.0
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary ago:AssetsofConsolidatedInvestmentVehicles100.0100.0100.0100.0100.0100.0100.0

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:ConsolidatedInvestmentVehicles


Assetsus-gaap:
Period End2020-09-302020-06-302019-12-31
Value14261569883
Percentage of Assets9.710.66.2
Percentage of Assets9.710.66.2
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary ago:ConsolidatedInvestmentVehicles100.0100.0100.0

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:FinancialGuarantyVariableInterestEntities


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312019-12-31
Value287281296442
Percentage of Assets1.71.81.93.1
Percentage of Assets1.71.81.93.1
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary ago:FinancialGuarantyVariableInterestEntities100.0100.0100.0100.0

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:FinancialGuarantyVariableInterestEntitiesAndConsolidatedInvestmentVehicles


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312019-12-31
Value342428741903883
Percentage of Assets19.917.912.46.2
Percentage of Assets19.917.912.46.2
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary ago:FinancialGuarantyVariableInterestEntitiesAndConsolidatedInvestmentVehicles100.0100.0100.0100.0

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

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:FinancialGuarantyVariableInterestEntities, us-gaap:Nonrecourse


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312019-12-31
Value281717102
Percentage of Assets0.20.10.10.7
Percentage of Assets0.20.10.10.7
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary ago:FinancialGuarantyVariableInterestEntities us-gaap:Nonrecourse100.0100.0100.0100.0

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:FinancialGuarantyVariableInterestEntities, us-gaap:Recourse


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312019-12-31
Value259264279340
Percentage of Assets1.51.61.82.4
Percentage of Assets1.51.61.82.4
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary ago:FinancialGuarantyVariableInterestEntities us-gaap:Recourse100.0100.0100.0100.0

us-gaap:Assets us-gaap:ConsolidatedEntities, us-gaap:MortgageLoansOnRealEstateDescriptionLoanCategory, us-gaap:StatementGeographical, us-gaap:FairValueByAssetClass, us-gaap:RecourseStatus, us-gaap:UnderlyingAssetClass

us-gaap:VariableInterestEntityPrimaryBeneficiary, us-gaap:FirstMortgage, country:US, ago:FinancialGuarantyVariableInterestEntities, us-gaap:Recourse, us-gaap:ResidentialMortgageBackedSecurities


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312019-12-31
Value216215226270
Percentage of Assets1.31.31.51.9
Percentage of Assets1.31.31.51.9
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary us-gaap:FirstMortgage country:US ago:FinancialGuarantyVariableInterestEntities us-gaap:Recourse us-gaap:ResidentialMortgageBackedSecurities100.0100.0100.0100.0

us-gaap:VariableInterestEntityPrimaryBeneficiary, us-gaap:SecondMortgage, country:US, ago:FinancialGuarantyVariableInterestEntities, us-gaap:Recourse, us-gaap:ResidentialMortgageBackedSecurities


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312019-12-31
Value43495370
Percentage of Assets0.20.30.30.5
Percentage of Assets0.20.30.30.5
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary us-gaap:SecondMortgage country:US ago:FinancialGuarantyVariableInterestEntities us-gaap:Recourse us-gaap:ResidentialMortgageBackedSecurities100.0100.0100.0100.0

us-gaap:Assets us-gaap:ConsolidatedEntities, us-gaap:MortgageLoansOnRealEstateDescriptionLoanCategory, us-gaap:StatementGeographical, us-gaap:RecourseStatus, us-gaap:UnderlyingAssetClass

us-gaap:VariableInterestEntityPrimaryBeneficiary, us-gaap:FirstMortgage, country:US, us-gaap:Recourse, us-gaap:ResidentialMortgageBackedSecurities


Assetsus-gaap:
Period End2020-09-302020-06-302019-12-31
Value228228270
Percentage of Assets1.61.51.9
Percentage of Assets1.61.51.9
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary us-gaap:FirstMortgage country:US us-gaap:Recourse us-gaap:ResidentialMortgageBackedSecurities100.0100.0100.0

us-gaap:VariableInterestEntityPrimaryBeneficiary, us-gaap:SecondMortgage, country:US, us-gaap:Recourse, us-gaap:OtherAssets


Assetsus-gaap:
Period End2020-09-302020-06-302019-12-31
Value11110.0
Percentage of Assets0.10.10.0
Percentage of Assets0.10.10.0
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary us-gaap:SecondMortgage country:US us-gaap:Recourse us-gaap:OtherAssets100.0100.00.0

us-gaap:VariableInterestEntityPrimaryBeneficiary, us-gaap:SecondMortgage, country:US, us-gaap:Recourse, us-gaap:ResidentialMortgageBackedSecurities


Assetsus-gaap:
Period End2020-09-302020-06-302019-12-31
Value565970
Percentage of Assets0.40.40.5
Percentage of Assets0.40.40.5
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary us-gaap:SecondMortgage country:US us-gaap:Recourse us-gaap:ResidentialMortgageBackedSecurities100.0100.0100.0

us-gaap:Assets us-gaap:ConsolidatedEntities, us-gaap:RecourseStatus

us-gaap:VariableInterestEntityPrimaryBeneficiary, us-gaap:Nonrecourse


Assetsus-gaap:
Period End2020-09-302020-06-302019-12-31
Value1920102
Percentage of Assets0.10.10.7
Percentage of Assets0.10.10.7
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary us-gaap:Nonrecourse100.0100.0100.0

us-gaap:VariableInterestEntityPrimaryBeneficiary, us-gaap:Recourse


Assetsus-gaap:
Period End2020-09-302020-06-302019-12-31
Value295298340
Percentage of Assets2.02.02.4
Percentage of Assets2.02.02.4
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary us-gaap:Recourse100.0100.0100.0

Liabilities

us-gaap:Liabilities

us-gaap:Liabilities


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1065395258629807882717472767467156859688270487156749872357594777179058038764780297842833984819215967388919167100151044898971117211520121241257512248126111335014322133731363815288156141667213282
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets61.859.556.355.056.054.453.650.250.550.851.852.153.151.652.653.053.954.854.054.755.657.758.361.362.560.661.465.266.665.568.670.473.072.771.071.873.977.473.974.179.580.081.479.1

us-gaap:Liabilities us-gaap:ConsolidatedEntities

us-gaap:VariableInterestEntityNotPrimaryBeneficiary


Liabilitiesus-gaap:
Period End2021-06-302021-03-312020-12-31
Value50519.0
Percentage of Liabilities0.50.50.1
Percentage of Assets0.30.30.1
Percentage of Assets us-gaap:VariableInterestEntityNotPrimaryBeneficiary26.328.74.4

us-gaap:VariableInterestEntityPrimaryBeneficiary


Liabilitiesus-gaap:
Period End2020-09-302020-06-302020-03-312019-12-31
Value355352394469
Percentage of Liabilities4.44.35.36.1
Percentage of Assets2.42.42.93.3
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary113.1110.7107.1106.1

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

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:BankDebtOfCLOWarehousesAtFairValueOption, ago:LiabilitiesofConsolidatedInvestmentVehicles


Liabilitiesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-30
Value123682547
Percentage of Liabilities1.20.70.30.6
Percentage of Assets0.70.40.20.3
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary ago:BankDebtOfCLOWarehousesAtFairValueOption ago:LiabilitiesofConsolidatedInvestmentVehicles0.00.00.00.0

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:CollateralizedLoanObligationsofCFEAtFairValue, ago:LiabilitiesofConsolidatedInvestmentVehicles


Liabilitiesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value235919731227830806426481
Percentage of Liabilities22.120.714.210.39.75.76.3
Percentage of Assets13.712.38.05.65.53.13.4
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary ago:CollateralizedLoanObligationsofCFEAtFairValue ago:LiabilitiesofConsolidatedInvestmentVehicles0.00.00.00.00.00.00.0

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:DuetoBrokersandCounterparties, ago:LiabilitiesofConsolidatedInvestmentVehicles


Liabilitiesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value5834772901624000.0
Percentage of Liabilities5.55.03.42.04.80.0
Percentage of Assets3.43.01.91.12.70.0
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary ago:DuetoBrokersandCounterparties ago:LiabilitiesofConsolidatedInvestmentVehicles0.00.00.00.00.00.0

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:SecuritiesSoldShort, ago:LiabilitiesofConsolidatedInvestmentVehicles


Liabilitiesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value44554753300.0
Percentage of Liabilities0.40.60.50.70.40.0
Percentage of Assets0.30.30.30.40.20.0
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary ago:SecuritiesSoldShort ago:LiabilitiesofConsolidatedInvestmentVehicles0.00.00.00.00.00.0

us-gaap:VariableInterestEntityPrimaryBeneficiary, us-gaap:OtherLiabilities, ago:LiabilitiesofConsolidatedInvestmentVehicles


Liabilitiesus-gaap:
Period End2020-12-312020-06-302020-03-312019-12-31
Value1.00.05.01.0
Percentage of Liabilities0.00.00.10.0
Percentage of Assets0.00.00.00.0
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary us-gaap:OtherLiabilities ago:LiabilitiesofConsolidatedInvestmentVehicles0.00.00.00.0

us-gaap:Liabilities us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:ConsolidatedInvestmentVehicles


Liabilitiesus-gaap:
Period End2020-09-302020-06-302019-12-31
Value13621502871
Percentage of Liabilities16.918.211.4
Percentage of Assets9.310.26.1
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary ago:ConsolidatedInvestmentVehicles95.595.798.6

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:FinancialGuarantyVariableInterestEntities


Liabilitiesus-gaap:
Period End2021-06-302021-03-312020-12-312019-12-31
Value320318333469
Percentage of Liabilities3.03.33.96.1
Percentage of Assets1.92.02.23.3
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary ago:FinancialGuarantyVariableInterestEntities111.5113.2112.5106.1

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:FinancialGuarantyVariableInterestEntitiesAndConsolidatedInvestmentVehicles


Liabilitiesus-gaap:
Period End2021-06-302021-03-312020-12-312019-12-31
Value335528151844871
Percentage of Liabilities31.529.621.411.4
Percentage of Assets19.517.612.06.1
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary ago:FinancialGuarantyVariableInterestEntitiesAndConsolidatedInvestmentVehicles98.097.996.998.6

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:LiabilitiesofConsolidatedInvestmentVehicles


Liabilitiesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value31092573159010921236431482
Percentage of Liabilities29.227.018.413.514.95.86.3
Percentage of Assets18.016.110.47.48.43.13.4
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary ago:LiabilitiesofConsolidatedInvestmentVehicles0.00.00.00.00.00.00.0

us-gaap:Liabilities us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass, us-gaap:RecourseStatus

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:FinancialGuarantyVariableInterestEntities, us-gaap:Nonrecourse


Liabilitiesus-gaap:
Period End2021-06-302021-03-312020-12-312019-12-31
Value241717102
Percentage of Liabilities0.20.20.21.3
Percentage of Assets0.10.10.10.7
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary ago:FinancialGuarantyVariableInterestEntities us-gaap:Nonrecourse85.7100.0100.0100.0

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:FinancialGuarantyVariableInterestEntities, us-gaap:Recourse


Liabilitiesus-gaap:
Period End2021-06-302021-03-312020-12-312019-12-31
Value296301316367
Percentage of Liabilities2.83.23.74.8
Percentage of Assets1.71.92.12.6
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary ago:FinancialGuarantyVariableInterestEntities us-gaap:Recourse114.3114.0113.3107.9

us-gaap:Liabilities us-gaap:ConsolidatedEntities, us-gaap:MortgageLoansOnRealEstateDescriptionLoanCategory, us-gaap:StatementGeographical, us-gaap:FairValueByAssetClass, us-gaap:RecourseStatus, us-gaap:UnderlyingAssetClass

us-gaap:VariableInterestEntityPrimaryBeneficiary, us-gaap:FirstMortgage, country:US, ago:FinancialGuarantyVariableInterestEntities, us-gaap:Recourse, us-gaap:ResidentialMortgageBackedSecurities


Liabilitiesus-gaap:
Period End2021-06-302021-03-312020-12-312019-12-31
Value247249260297
Percentage of Liabilities2.32.63.03.9
Percentage of Assets1.41.61.72.1
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary us-gaap:FirstMortgage country:US ago:FinancialGuarantyVariableInterestEntities us-gaap:Recourse us-gaap:ResidentialMortgageBackedSecurities114.4115.8115.0110.0

us-gaap:VariableInterestEntityPrimaryBeneficiary, us-gaap:SecondMortgage, country:US, ago:FinancialGuarantyVariableInterestEntities, us-gaap:Recourse, us-gaap:ResidentialMortgageBackedSecurities


Liabilitiesus-gaap:
Period End2021-06-302021-03-312020-12-312019-12-31
Value49525670
Percentage of Liabilities0.50.50.60.9
Percentage of Assets0.30.30.40.5
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary us-gaap:SecondMortgage country:US ago:FinancialGuarantyVariableInterestEntities us-gaap:Recourse us-gaap:ResidentialMortgageBackedSecurities114.0106.1105.7100.0

us-gaap:Liabilities us-gaap:ConsolidatedEntities, us-gaap:MortgageLoansOnRealEstateDescriptionLoanCategory, us-gaap:StatementGeographical, us-gaap:RecourseStatus, us-gaap:UnderlyingAssetClass

us-gaap:VariableInterestEntityPrimaryBeneficiary, us-gaap:FirstMortgage, country:US, us-gaap:Recourse, us-gaap:ResidentialMortgageBackedSecurities


Liabilitiesus-gaap:
Period End2020-09-302020-06-302019-12-31
Value266261297
Percentage of Liabilities3.33.23.9
Percentage of Assets1.81.82.1
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary us-gaap:FirstMortgage country:US us-gaap:Recourse us-gaap:ResidentialMortgageBackedSecurities116.7114.5110.0

us-gaap:VariableInterestEntityPrimaryBeneficiary, us-gaap:SecondMortgage, country:US, us-gaap:Recourse, us-gaap:OtherAssets


Liabilitiesus-gaap:
Period End2020-09-302020-06-302019-12-31
Value12120.0
Percentage of Liabilities0.10.10.0
Percentage of Assets0.10.10.0
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary us-gaap:SecondMortgage country:US us-gaap:Recourse us-gaap:OtherAssets109.1109.10.0

us-gaap:VariableInterestEntityPrimaryBeneficiary, us-gaap:SecondMortgage, country:US, us-gaap:Recourse, us-gaap:ResidentialMortgageBackedSecurities


Liabilitiesus-gaap:
Period End2020-09-302020-06-302019-12-31
Value585970
Percentage of Liabilities0.70.70.9
Percentage of Assets0.40.40.5
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary us-gaap:SecondMortgage country:US us-gaap:Recourse us-gaap:ResidentialMortgageBackedSecurities103.6100.0100.0

us-gaap:Liabilities us-gaap:ConsolidatedEntities, us-gaap:RecourseStatus

us-gaap:VariableInterestEntityPrimaryBeneficiary, us-gaap:Nonrecourse


Liabilitiesus-gaap:
Period End2020-09-302020-06-302019-12-31
Value1920102
Percentage of Liabilities0.20.21.3
Percentage of Assets0.10.10.7
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary us-gaap:Nonrecourse100.0100.0100.0

us-gaap:VariableInterestEntityPrimaryBeneficiary, us-gaap:Recourse


Liabilitiesus-gaap:
Period End2020-09-302020-06-302019-12-31
Value336332367
Percentage of Liabilities4.24.04.8
Percentage of Assets2.32.22.6
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary us-gaap:Recourse113.9111.4107.9

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:LiabilitiesAndStockholdersEquity


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1722616018153341469514780137451432613367135811355113603137391413214019144331464914655146751415114669140921445214544150341547914677149251536915690151061628716354166081729917242175631807418504180911840419238195092047116802
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilitiesAndStockholdersEquity us-gaap:ConsolidatedEntities

srt:ParentCompany


Liabilities
Period End2020-12-312019-12-31
Value66606656
Percentage of LiabilitiesAndStockholdersEquity43.446.5
Percentage of Assets43.446.5
Percentage of Assets srt:ParentCompany100.0100.0

us-gaap:LiabilitiesAndStockholdersEquity us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:ConsolidatedInvestmentVehicles


Liabilities
Period End2020-09-302020-06-302019-12-31
Value14261569883
Percentage of LiabilitiesAndStockholdersEquity9.710.66.2
Percentage of Assets9.710.66.2
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary ago:ConsolidatedInvestmentVehicles100.0100.0100.0

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:FinancialGuarantyVariableInterestEntitiesAndConsolidatedInvestmentVehicles


Liabilities
Period End2021-06-302021-03-312020-12-312019-12-31
Value342428741903883
Percentage of LiabilitiesAndStockholdersEquity19.917.912.46.2
Percentage of Assets19.917.912.46.2
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary ago:FinancialGuarantyVariableInterestEntitiesAndConsolidatedInvestmentVehicles100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-31
Value6503643066436549644462406639665267226669655565836634678468396878675066376504664062506113606358195806578657585354524252095115483444844724499449524724418246514766395037983520
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets37.840.143.344.643.645.446.349.849.549.248.247.946.948.447.447.046.145.246.045.344.442.341.738.737.539.438.634.833.434.531.429.627.027.329.028.226.122.625.725.920.518.621.0

us-gaap:StockholdersEquity us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:ConsolidatedInvestmentVehicles


Stockholders
Period End2020-09-302020-06-302019-12-31
Value-4.02.0-1.0
Percentage of StockholdersEquity-0.10.0-0.0
Percentage of Assets-0.00.0-0.0
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary ago:ConsolidatedInvestmentVehicles-0.30.1-0.1

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:FinancialGuarantyVariableInterestEntitiesAndConsolidatedInvestmentVehicles


Stockholders
Period End2021-06-302021-03-312020-12-312019-12-31
Value-1.0-4.0-3.0-1.0
Percentage of StockholdersEquity-0.0-0.1-0.0-0.0
Percentage of Assets-0.0-0.0-0.0-0.0
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary ago:FinancialGuarantyVariableInterestEntitiesAndConsolidatedInvestmentVehicles-0.0-0.1-0.2-0.1

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedGainLossFinancialLiabilityFairValueOptionAttributableToParent


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value-23.0-21.0-20.0-26.0-22.0-17.0-27.0-27.0-27.0-31.0-31.0-34.0-31.0-35.00.0
Percentage of StockholdersEquity-0.4-0.3-0.3-0.4-0.3-0.3-0.4-0.4-0.4-0.5-0.5-0.5-0.5-0.50.0
Percentage of Assets-0.1-0.1-0.1-0.2-0.1-0.1-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.20.0
Percentage of Assets us-gaap:AccumulatedGainLossFinancialLiabilityFairValueOptionAttributableToParent0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


Stockholders
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value7.07.07.07.07.08.08.08.08.08.08.08.08.07.07.07.07.07.07.08.08.08.08.08.09.09.0
Percentage of StockholdersEquity0.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.20.2
Percentage of Assets0.00.00.00.10.00.10.10.10.10.10.10.10.10.00.00.00.00.00.00.10.10.10.10.10.10.1
Percentage of Assets us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value509458577494427252352334301222592483146273240228170171390426350260278236372367178
Percentage of StockholdersEquity7.87.18.77.56.64.05.35.04.53.30.90.41.32.24.03.53.42.62.65.96.85.74.34.84.16.46.43.5
Percentage of Assets3.02.93.83.42.91.82.52.52.21.60.40.20.61.01.91.61.61.21.22.73.02.41.81.81.52.52.51.1
Percentage of Assets us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302010-12-312009-12-31
Value4453734984043331383423192952619378152214372326315206149358383319237273239370370333332264160206209447515531429398367327111142
Percentage of StockholdersEquity6.85.87.56.25.22.25.24.84.43.91.41.22.33.25.44.74.73.12.35.46.15.23.94.74.16.46.46.26.35.13.14.34.79.510.310.79.19.57.96.92.94.0
Percentage of Assets2.62.33.22.72.31.02.42.42.21.90.70.61.11.52.62.22.11.41.12.42.72.21.61.81.52.52.52.22.11.71.01.31.32.63.03.02.42.22.01.80.50.8
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherThanTemporaryImpairment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value-12.0-36.0-30.0-33.0-41.0-66.048425199941151241181201031076610.0-8.0-24.0-21.0-15.00.04.05.04.0-24.0
Percentage of StockholdersEquity-0.2-0.6-0.5-0.5-0.6-1.10.70.60.81.51.41.71.91.71.81.51.61.00.2-0.1-0.4-0.3-0.20.00.10.10.1-0.5
Percentage of Assets-0.1-0.2-0.2-0.2-0.3-0.50.30.30.40.70.70.80.90.80.80.70.70.40.1-0.1-0.2-0.1-0.10.00.00.00.0-0.1
Percentage of Assets us-gaap:AccumulatedOtherThanTemporaryImpairment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value-36.0-35.0-36.0-38.0-38.0-38.0-38.0-38.0-38.0-37.0-37.0-35.0-32.0-23.0-29.0-24.0-27.0-37.0-39.0-31.0-26.0-18.0-16.0-13.0-9.0-15.0-10.0-3.0
Percentage of StockholdersEquity-0.6-0.5-0.5-0.6-0.6-0.6-0.6-0.6-0.6-0.6-0.6-0.5-0.5-0.3-0.4-0.3-0.4-0.6-0.6-0.5-0.4-0.3-0.3-0.2-0.2-0.3-0.2-0.1
Percentage of Assets-0.2-0.2-0.2-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.2-0.2-0.2-0.2-0.2-0.3-0.3-0.2-0.2-0.1-0.1-0.1-0.1-0.1-0.1-0.0
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Cash

us-gaap:Cash

us-gaap:Cash


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value14495162223293139169229190123104821851141447220014711898190112166667588575821062191841061431251381331751822141731599510794979044128.048
Percentage of Cash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.80.61.11.52.01.01.21.71.40.90.80.61.30.81.00.51.41.00.80.71.30.81.10.40.56.00.50.50.71.41.10.60.90.70.80.81.01.01.20.90.80.50.50.00.00.00.30.00.0

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value29634629840647322118322919412310482189117144127
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.72.21.92.83.21.61.31.71.40.90.80.61.30.81.00.9

Short Term Investments

us-gaap:ShortTermInvestments

us-gaap:ShortTermInvestments


Short
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1087701851858821933126811421159727729738911751627949678689590528585459396522834349767837979720904761943729817564919903734873107076810311668
Percentage of ShortTermInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets6.34.45.55.85.66.88.98.58.55.45.45.46.45.44.36.54.64.74.23.64.23.22.73.55.42.45.15.46.24.85.64.75.74.24.73.25.14.94.14.75.63.95.09.9

Investments In Affiliates Subsidiaries Associates And Joint Ventures

us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures us-gaap:ConsolidatedEntities

us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures

srt:ParentCompany


Investments
Period End2020-12-312019-12-31
Value64326450
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures100.0100.0
Percentage of Assets41.945.0
Percentage of Assets srt:ParentCompany96.696.9

Goodwill

us-gaap:Goodwill

us-gaap:Goodwill


Goodwill
Period End2020-12-312019-12-312018-12-31
Value1171170.0
Percentage of Goodwill100.0100.00.0
Percentage of Assets0.80.80.0

Finite Lived Intangible Assets Net

us-gaap:FiniteLivedIntangibleAssetsNet

us-gaap:FiniteLivedIntangibleAssetsNet


Finite
Period End2020-12-312019-12-312018-12-31
Value64772.0
Percentage of FiniteLivedIntangibleAssetsNet100.0100.0100.0
Percentage of Assets0.40.50.0

Intangible Assets Net Including Goodwill

us-gaap:IntangibleAssetsNetIncludingGoodwill

us-gaap:IntangibleAssetsNetIncludingGoodwill


Intangible
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value18118420320620921221624
Percentage of IntangibleAssetsNetIncludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.11.11.31.41.41.51.50.2

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OperatingLeaseRightOfUseAsset


Operating
Period End2020-12-312019-12-312019-09-302019-06-302019-03-312019-01-01
Value7810065666769
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.0100.0
Percentage of Assets0.50.70.50.50.50.0

Other Assets

us-gaap:OtherAssets

us-gaap:OtherAssets


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value439443440486513593543517520568499485557507322398352318317291285302294300321294276291271250309255262296272286314337262243198221199202
Percentage of OtherAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.52.82.93.33.54.33.83.93.84.23.73.53.93.62.22.72.42.22.22.02.02.12.02.02.12.01.81.91.71.71.91.61.61.71.61.61.71.81.41.31.01.11.01.2

us-gaap:OtherAssets us-gaap:ConsolidatedEntities

srt:ParentCompany


Other
Period End2020-12-312019-12-31
Value3831
Percentage of OtherAssets8.65.7
Percentage of Assets0.20.2
Percentage of Assets srt:ParentCompany0.60.5

us-gaap:OtherAssets us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:FinancialGuarantyVariableInterestEntitiesAndConsolidatedInvestmentVehicles


Other
Period End2021-06-302021-03-312020-12-31
Value-1.01.0-3.0
Percentage of OtherAssets-0.20.2-0.7
Percentage of Assets-0.00.0-0.0
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary ago:FinancialGuarantyVariableInterestEntitiesAndConsolidatedInvestmentVehicles-0.00.0-0.2

Long Term Debt

us-gaap:LongTermDebt

us-gaap:LongTermDebt


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value172012251224122312221221123512341233123212331249126412811292129212941307130613041303130213001306130513041303130313118128168198278328368408461034103810411046104910521066
Percentage of LongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets10.07.68.08.38.38.98.69.29.19.19.19.18.99.19.08.88.88.99.28.99.29.08.98.78.48.98.78.58.45.45.05.05.04.84.84.84.75.65.75.75.45.45.16.3

us-gaap:LongTermDebt ago:LoansInsuredOrGuaranteeForGovernmentAuthorities, us-gaap:CounterpartyName, us-gaap:StatementGeographical, us-gaap:SubsequentEventType

ago:ConstitutionallyGuaranteed, ago:CommonwealthofPuertoRicoGeneralObligationBonds, country:PR, us-gaap:SubsequentEvent


Long
Period End2021-02-23
Value18800
Percentage of LongTermDebt0.0
Percentage of Assets0.0
Percentage of Assets ago:ConstitutionallyGuaranteed ago:CommonwealthofPuertoRicoGeneralObligationBonds country:PR us-gaap:SubsequentEvent0.0

us-gaap:LongTermDebt dei:LegalEntity

ago:AssuredGuarantyMunicipalCorp


Long
Period End2021-06-302020-12-312019-12-312019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value2.03.04.05.05.05.05.06.06.08.09.09.010.0111212131516181938
Percentage of LongTermDebt0.10.20.30.40.40.40.40.50.50.60.70.70.80.80.90.91.01.11.21.41.54.7
Percentage of Assets0.00.00.00.00.00.00.00.00.00.10.10.10.10.10.10.10.10.10.10.10.10.2
Percentage of Assets ago:AssuredGuarantyMunicipalCorp0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

ago:AssuredGuarantyMunicipalHoldingsInc


Long
Period End2021-06-302020-12-312019-12-312019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value487483476470468466464463461459456455453451449447445444442439437430
Percentage of LongTermDebt28.339.538.538.138.037.336.736.135.735.535.234.834.734.634.534.334.234.033.933.733.552.7
Percentage of Assets2.83.13.33.53.43.43.33.33.23.13.13.13.23.13.23.13.13.02.93.02.92.6
Percentage of Assets ago:AssuredGuarantyMunicipalHoldingsInc0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

ago:AssuredGuarantyUSHoldingInc


Long
Period End2021-06-302020-12-312019-12-312019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value162011251134844844844844843843843843843843842842843842847847847847348
Percentage of LongTermDebt94.291.991.868.568.567.666.865.865.265.265.164.564.564.664.664.764.864.964.965.065.042.6
Percentage of Assets9.47.37.96.26.26.16.06.05.85.85.85.76.05.76.05.85.85.65.55.85.72.1
Percentage of Assets ago:AssuredGuarantyUSHoldingInc0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:LongTermDebt dei:LegalEntity, us-gaap:ConsolidationItems, us-gaap:LongtermDebtType

ago:AssuredGuarantyUSHoldingInc, srt:ConsolidationEliminations, ago:AGMHsDebtPurchasedbyAGUS


Long
Period End2021-06-302020-12-312019-12-312018-12-31
Value-109.0-107.0-89.0-84.0
Percentage of LongTermDebt-6.3-8.7-7.2-6.8
Percentage of Assets-0.6-0.7-0.6-0.6
Percentage of Assets ago:AssuredGuarantyUSHoldingInc srt:ConsolidationEliminations ago:AGMHsDebtPurchasedbyAGUS0.00.00.00.0

us-gaap:LongTermDebt dei:LegalEntity, us-gaap:DebtInstrument, us-gaap:LongtermDebtType

ago:AssuredGuarantyMunicipalHoldingsInc, ago:NotesPayable560Percent, us-gaap:NotesPayableOtherPayables


Long
Period End2021-06-302020-12-312019-12-312019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value58585857575757575756565656565656565555555555
Percentage of LongTermDebt3.44.74.74.64.64.64.54.44.44.34.34.34.34.34.34.34.34.24.24.24.26.7
Percentage of Assets0.30.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.3
Percentage of Assets ago:AssuredGuarantyMunicipalHoldingsInc ago:NotesPayable560Percent us-gaap:NotesPayableOtherPayables0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

ago:AssuredGuarantyMunicipalHoldingsInc, ago:NotesPayable625Percent, us-gaap:NotesPayableOtherPayables


Long
Period End2021-06-302020-12-312019-12-312019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value146145144144143143142142142142142141141141140140140140140139139138
Percentage of LongTermDebt8.511.811.711.711.611.411.211.111.011.011.010.810.810.810.710.810.810.710.710.710.716.9
Percentage of Assets0.80.91.01.11.11.01.01.01.01.01.01.01.01.01.01.01.00.90.90.90.90.8
Percentage of Assets ago:AssuredGuarantyMunicipalHoldingsInc ago:NotesPayable625Percent us-gaap:NotesPayableOtherPayables0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

ago:AssuredGuarantyMunicipalHoldingsInc, ago:Quibs6875Percent, us-gaap:CorporateDebtSecurities


Long
Period End2021-06-302020-12-312019-12-312019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value71717070707070707070696969696969696969686868
Percentage of LongTermDebt4.15.85.75.75.75.65.55.55.45.45.35.35.35.35.35.35.35.35.35.25.28.3
Percentage of Assets0.40.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.40.50.50.4
Percentage of Assets ago:AssuredGuarantyMunicipalHoldingsInc ago:Quibs6875Percent us-gaap:CorporateDebtSecurities0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

ago:AssuredGuarantyUSHoldingInc, ago:A315SeniorNotes, us-gaap:SeniorNotes


Long
Period End2021-06-30
Value494
Percentage of LongTermDebt28.7
Percentage of Assets2.9
Percentage of Assets ago:AssuredGuarantyUSHoldingInc ago:A315SeniorNotes us-gaap:SeniorNotes0.0

ago:AssuredGuarantyUSHoldingInc, ago:SeniorNotes5.0Percent, us-gaap:SeniorNotes


Long
Period End2021-06-302020-12-312019-12-312019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value4994984974974974974974964964964964964964954954964954994994994990.0
Percentage of LongTermDebt29.040.740.240.340.339.839.338.738.438.438.337.938.038.038.038.138.138.238.238.338.30.0
Percentage of Assets2.93.23.53.73.73.63.53.53.43.43.43.43.53.43.53.43.43.33.23.43.30.0
Percentage of Assets ago:AssuredGuarantyUSHoldingInc ago:SeniorNotes5.0Percent us-gaap:SeniorNotes0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

ago:AssuredGuarantyUSHoldingInc, ago:SeniorNotes70Percent, us-gaap:SeniorNotes


Long
Period End2021-06-302020-12-312019-12-312019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value197197197197197197197197197197197197197197197197197198198198198198
Percentage of LongTermDebt11.516.116.016.016.015.815.615.415.215.215.215.115.115.115.115.115.215.215.215.215.224.3
Percentage of Assets1.11.31.41.51.41.41.41.41.41.31.31.31.41.31.41.41.41.31.31.31.31.2
Percentage of Assets ago:AssuredGuarantyUSHoldingInc ago:SeniorNotes70Percent us-gaap:SeniorNotes0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:LongTermDebt dei:LegalEntity, us-gaap:LongtermDebtType

ago:AssuredGuarantyMunicipalCorp, us-gaap:NotesPayableOtherPayables


Long
Period End2021-06-302020-12-312019-12-312019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value2.03.04.05.05.05.05.06.06.08.09.09.010.0111212131516181938
Percentage of LongTermDebt0.10.20.30.40.40.40.40.50.50.60.70.70.80.80.90.91.01.11.21.41.54.7
Percentage of Assets0.00.00.00.00.00.00.00.00.00.10.10.10.10.10.10.10.10.10.10.10.10.2
Percentage of Assets ago:AssuredGuarantyMunicipalCorp us-gaap:NotesPayableOtherPayables0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

ago:AssuredGuarantyMunicipalHoldingsInc, us-gaap:JuniorSubordinatedDebt


Long
Period End2021-06-302020-12-312019-12-312019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value212209204199198196195194192191189189187185184182180180178177175169
Percentage of LongTermDebt12.317.116.516.216.115.715.415.114.914.814.614.514.314.214.114.013.813.813.613.613.420.7
Percentage of Assets1.21.41.41.51.51.41.41.41.31.31.31.31.31.31.31.31.21.21.11.21.21.0
Percentage of Assets ago:AssuredGuarantyMunicipalHoldingsInc us-gaap:JuniorSubordinatedDebt0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

ago:AssuredGuarantyUSHoldingInc, ago:IntercompanyLoansPayable


Long
Period End2021-06-302020-12-312019-12-312018-12-31
Value28028029050
Percentage of LongTermDebt16.322.923.54.1
Percentage of Assets1.61.82.00.4
Percentage of Assets ago:AssuredGuarantyUSHoldingInc ago:IntercompanyLoansPayable0.00.00.00.0

ago:AssuredGuarantyUSHoldingInc, us-gaap:LongTermDebt


Long
Period End2021-06-302020-12-312019-12-312018-12-31
Value1340845844844
Percentage of LongTermDebt77.969.068.368.5
Percentage of Assets7.85.55.96.2
Percentage of Assets ago:AssuredGuarantyUSHoldingInc us-gaap:LongTermDebt0.00.00.00.0

Minority Interest

us-gaap:MinorityInterest

us-gaap:MinorityInterest


Minority
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302009-12-31
Value4942414745256.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0-0.4
Percentage of MinorityInterest100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0100.0
Percentage of Assets0.30.30.30.30.30.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0-0.0

us-gaap:MinorityInterest us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:ConsolidatedInvestmentVehicles


Minority
Period End2020-09-302020-06-302019-12-31
Value47456.0
Percentage of MinorityInterest100.0100.0100.0
Percentage of Assets0.30.30.0
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary ago:ConsolidatedInvestmentVehicles3.32.90.7

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:FinancialGuarantyVariableInterestEntitiesAndConsolidatedInvestmentVehicles


Minority
Period End2021-06-302021-03-312020-12-312019-12-31
Value4942416.0
Percentage of MinorityInterest100.0100.0100.0100.0
Percentage of Assets0.30.30.30.0
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary ago:FinancialGuarantyVariableInterestEntitiesAndConsolidatedInvestmentVehicles1.41.52.20.7

Lessee Operating Lease Liability Payments Due Year Two

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo


Lessee
Period End2020-12-31
Value20
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo100.0
Percentage of Assets0.1

Lessee Operating Lease Liability Payments Due Year Three

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree


Lessee
Period End2020-12-31
Value20
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree100.0
Percentage of Assets0.1

Lessee Operating Lease Liability Payments Due Year Four

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour


Lessee
Period End2020-12-31
Value11
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour100.0
Percentage of Assets0.1

Lessee Operating Lease Liability Payments Due Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive


Lessee
Period End2020-12-31
Value9000000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive100.0
Percentage of Assets0.1

Lessee Operating Lease Liability Payments Due After Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive


Lessee
Period End2020-12-31
Value55
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive100.0
Percentage of Assets0.4

Operating Lease Liability

us-gaap:OperatingLeaseLiability

us-gaap:OperatingLeaseLiability


Operating
Period End2020-12-312019-12-312019-09-302019-06-302019-03-312019-01-01
Value11813090919395
Percentage of OperatingLeaseLiability100.0100.0100.0100.0100.0100.0
Percentage of Assets0.80.90.70.70.70.0

Lessee Operating Lease Liability Payments Due

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue


Lessee
Period End2020-12-31
Value134
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue100.0
Percentage of Assets0.9

Lessee Operating Lease Liability Undiscounted Excess Amount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount


Lessee
Period End2020-12-31
Value16
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount100.0
Percentage of Assets0.1

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-31
Value6503643066436549644462406639665267226669655565836634678468396878675066376504664062506113606358195806578657585354524252095115483444844724499449524724418246514766395037983520
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets37.840.143.344.643.645.446.349.849.549.248.247.946.948.447.447.046.145.246.045.344.442.341.738.737.539.438.634.833.434.531.429.627.027.329.028.226.122.625.725.920.518.621.0

us-gaap:StockholdersEquity us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:ConsolidatedInvestmentVehicles


Stockholders
Period End2020-09-302020-06-302019-12-31
Value-4.02.0-1.0
Percentage of StockholdersEquity-0.10.0-0.0
Percentage of Assets-0.00.0-0.0
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary ago:ConsolidatedInvestmentVehicles-0.30.1-0.1

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:FinancialGuarantyVariableInterestEntitiesAndConsolidatedInvestmentVehicles


Stockholders
Period End2021-06-302021-03-312020-12-312019-12-31
Value-1.0-4.0-3.0-1.0
Percentage of StockholdersEquity-0.0-0.1-0.0-0.0
Percentage of Assets-0.0-0.0-0.0-0.0
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary ago:FinancialGuarantyVariableInterestEntitiesAndConsolidatedInvestmentVehicles-0.0-0.1-0.2-0.1

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedGainLossFinancialLiabilityFairValueOptionAttributableToParent


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value-23.0-21.0-20.0-26.0-22.0-17.0-27.0-27.0-27.0-31.0-31.0-34.0-31.0-35.00.0
Percentage of StockholdersEquity-0.4-0.3-0.3-0.4-0.3-0.3-0.4-0.4-0.4-0.5-0.5-0.5-0.5-0.50.0
Percentage of Assets-0.1-0.1-0.1-0.2-0.1-0.1-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.20.0
Percentage of Assets us-gaap:AccumulatedGainLossFinancialLiabilityFairValueOptionAttributableToParent0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


Stockholders
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value7.07.07.07.07.08.08.08.08.08.08.08.08.07.07.07.07.07.07.08.08.08.08.08.09.09.0
Percentage of StockholdersEquity0.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.20.2
Percentage of Assets0.00.00.00.10.00.10.10.10.10.10.10.10.10.00.00.00.00.00.00.10.10.10.10.10.10.1
Percentage of Assets us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value509458577494427252352334301222592483146273240228170171390426350260278236372367178
Percentage of StockholdersEquity7.87.18.77.56.64.05.35.04.53.30.90.41.32.24.03.53.42.62.65.96.85.74.34.84.16.46.43.5
Percentage of Assets3.02.93.83.42.91.82.52.52.21.60.40.20.61.01.91.61.61.21.22.73.02.41.81.81.52.52.51.1
Percentage of Assets us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302010-12-312009-12-31
Value4453734984043331383423192952619378152214372326315206149358383319237273239370370333332264160206209447515531429398367327111142
Percentage of StockholdersEquity6.85.87.56.25.22.25.24.84.43.91.41.22.33.25.44.74.73.12.35.46.15.23.94.74.16.46.46.26.35.13.14.34.79.510.310.79.19.57.96.92.94.0
Percentage of Assets2.62.33.22.72.31.02.42.42.21.90.70.61.11.52.62.22.11.41.12.42.72.21.61.81.52.52.52.22.11.71.01.31.32.63.03.02.42.22.01.80.50.8
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherThanTemporaryImpairment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value-12.0-36.0-30.0-33.0-41.0-66.048425199941151241181201031076610.0-8.0-24.0-21.0-15.00.04.05.04.0-24.0
Percentage of StockholdersEquity-0.2-0.6-0.5-0.5-0.6-1.10.70.60.81.51.41.71.91.71.81.51.61.00.2-0.1-0.4-0.3-0.20.00.10.10.1-0.5
Percentage of Assets-0.1-0.2-0.2-0.2-0.3-0.50.30.30.40.70.70.80.90.80.80.70.70.40.1-0.1-0.2-0.1-0.10.00.00.00.0-0.1
Percentage of Assets us-gaap:AccumulatedOtherThanTemporaryImpairment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value-36.0-35.0-36.0-38.0-38.0-38.0-38.0-38.0-38.0-37.0-37.0-35.0-32.0-23.0-29.0-24.0-27.0-37.0-39.0-31.0-26.0-18.0-16.0-13.0-9.0-15.0-10.0-3.0
Percentage of StockholdersEquity-0.6-0.5-0.5-0.6-0.6-0.6-0.6-0.6-0.6-0.6-0.6-0.5-0.5-0.3-0.4-0.3-0.4-0.6-0.6-0.5-0.4-0.3-0.3-0.2-0.2-0.3-0.2-0.1
Percentage of Assets-0.2-0.2-0.2-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.2-0.2-0.2-0.2-0.2-0.3-0.3-0.2-0.2-0.1-0.1-0.1-0.1-0.1-0.1-0.0
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Stockholders Equity Including Portion Attributable To Noncontrolling Interest

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302011-12-312011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value655264726684659664896265664566526722666965556583663467846839687867506637650466406250611360635819580657865758535452425209511548344718394938943798352019261666
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets38.040.443.644.943.945.646.449.849.549.248.247.946.948.447.447.046.145.246.045.344.442.341.738.737.539.438.634.833.434.531.429.626.120.520.018.620.90.00.0

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:ConsolidatedEntities

srt:ParentCompany


Stockholders
Period End2020-12-312019-12-31
Value66436639
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest99.499.9
Percentage of Assets43.346.3
Percentage of Assets srt:ParentCompany99.799.7

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:ConsolidatedInvestmentVehicles


Stockholders
Period End2020-09-302020-06-302019-12-31
Value43475.0
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest0.70.70.1
Percentage of Assets0.30.30.0
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary ago:ConsolidatedInvestmentVehicles3.03.00.6

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:FinancialGuarantyVariableInterestEntitiesAndConsolidatedInvestmentVehicles


Stockholders
Period End2021-06-302021-03-312020-12-312019-12-31
Value4838385.0
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest0.70.60.60.1
Percentage of Assets0.30.20.20.0
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary ago:FinancialGuarantyVariableInterestEntitiesAndConsolidatedInvestmentVehicles1.41.32.00.6

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312016-12-312011-12-312011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value44537349840433313834231929526193372149367205851101412.88756
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest6.85.87.56.15.12.25.14.84.43.91.45.42.37.85.22.22.94.00.13.4
Percentage of Assets2.62.33.22.72.31.02.42.42.21.90.72.61.12.01.10.40.50.80.00.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312016-12-312011-12-312011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value1.01.01.01.01.01.01.01.01.01.01.01.01.01.8221.8421.841.8371.8420.910.799
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.10.00.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:DeferredCompensationShareBasedPayments


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312016-12-312011-12-312011-06-302011-03-312010-12-312009-12-31
Value1.01.01.01.01.01.01.01.01.01.01.01.05.04.42.02.02.02.0
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest0.00.00.00.00.00.00.00.00.00.00.00.00.10.10.10.10.10.1
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:DeferredCompensationShareBasedPayments0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NoncontrollingInterest


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-06-302019-03-312018-12-312017-12-312016-12-312009-12-31
Value4942414745256.00.00.00.00.00.0-0.349
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest0.70.60.60.70.70.40.10.00.00.00.00.0-0.0
Percentage of Assets0.30.30.30.30.30.20.00.00.00.00.00.0-0.0
Percentage of Assets us-gaap:NoncontrollingInterest0.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Parent


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312016-12-312011-12-312010-12-312009-12-312008-12-312007-12-31
Value650364306643654964446240663966526722666965556839650447183798352019261666
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest99.399.499.499.399.399.699.9100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets37.840.143.344.643.645.446.349.849.549.248.247.446.026.118.621.00.00.0
Percentage of Assets us-gaap:Parent0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312016-12-312011-12-312011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value60566055614361436109610062956331642564066374589252891774114912151098789638585
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest92.493.691.993.194.197.494.795.295.696.197.286.281.337.629.131.228.922.433.135.1
Percentage of Assets35.237.840.141.841.344.443.947.447.347.346.940.837.49.86.06.25.44.70.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.01000000.02000000.02000000.02000000.02000000.02000000.02000000.02000000.02000000.02000000.02000000.02000000.01939000.01825000.01822000.01822000.01842000.01840000.01837000.01842000.0
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:RetainedEarningsAccumulatedDeficit


Retained
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value6056605561436143610961006295633164256406637463036159610258925913572255885289511046484519447840663955367634942979264325042482215117861586174916931568120817741866114912151098789
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets35.237.840.141.841.344.443.947.447.347.346.945.943.643.540.840.439.038.137.434.833.031.330.827.025.625.023.419.416.816.615.213.210.89.210.19.68.76.59.810.16.06.25.44.7

us-gaap:RetainedEarningsAccumulatedDeficit us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:ConsolidatedInvestmentVehicles


Retained
Period End2020-09-302020-06-302019-12-31
Value273034
Percentage of RetainedEarningsAccumulatedDeficit0.40.50.5
Percentage of Assets0.20.20.2
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary ago:ConsolidatedInvestmentVehicles1.91.93.9

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:FinancialGuarantyVariableInterestEntitiesAndConsolidatedInvestmentVehicles


Retained
Period End2021-06-302021-03-312020-12-312019-12-31
Value26222234
Percentage of RetainedEarningsAccumulatedDeficit0.40.40.40.5
Percentage of Assets0.20.10.10.2
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary ago:FinancialGuarantyVariableInterestEntitiesAndConsolidatedInvestmentVehicles0.80.81.23.9

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value445373498404333138342319295261937815221437232631520614935838331923727323937037033333226416020620944751553142939836732720585110141
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.62.33.22.72.31.02.42.42.21.90.70.61.11.52.62.22.11.41.12.42.72.21.61.81.52.52.52.22.11.71.01.31.32.63.03.02.42.22.01.81.10.40.50.8

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:ConsolidatedInvestmentVehicles


Accumulated
Period End2020-09-302020-06-302019-12-31
Value-31.0-28.0-35.0
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax-7.7-8.4-10.2
Percentage of Assets-0.2-0.2-0.2
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary ago:ConsolidatedInvestmentVehicles-2.2-1.8-4.0

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:FinancialGuarantyVariableInterestEntitiesAndConsolidatedInvestmentVehicles


Accumulated
Period End2021-06-302021-03-312020-12-312019-12-31
Value-27.0-26.0-25.0-35.0
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax-6.1-7.0-5.0-10.2
Percentage of Assets-0.2-0.2-0.2-0.2
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary ago:FinancialGuarantyVariableInterestEntitiesAndConsolidatedInvestmentVehicles-0.8-0.9-1.3-4.0

Minority Interest

us-gaap:MinorityInterest

us-gaap:MinorityInterest


Minority
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302009-12-31
Value4942414745256.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0-0.4
Percentage of MinorityInterest100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0100.0
Percentage of Assets0.30.30.30.30.30.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0-0.0

us-gaap:MinorityInterest us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:ConsolidatedInvestmentVehicles


Minority
Period End2020-09-302020-06-302019-12-31
Value47456.0
Percentage of MinorityInterest100.0100.0100.0
Percentage of Assets0.30.30.0
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary ago:ConsolidatedInvestmentVehicles3.32.90.7

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:FinancialGuarantyVariableInterestEntitiesAndConsolidatedInvestmentVehicles


Minority
Period End2021-06-302021-03-312020-12-312019-12-31
Value4942416.0
Percentage of MinorityInterest100.0100.0100.0100.0
Percentage of Assets0.30.30.30.0
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary ago:FinancialGuarantyVariableInterestEntitiesAndConsolidatedInvestmentVehicles1.41.52.20.7

Minority Interest Decrease From Distributions To Noncontrolling Interest Holders

us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders

us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders


Minority
Period End2021-06-302021-03-312020-12-312020-09-302020-06-30
Value3.06.0263.016
Percentage of MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.0

us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest


Minority
Period End2021-06-302021-03-312020-12-312020-09-302020-06-30
Value3.06.0263.016
Percentage of MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.0
Percentage of Assets us-gaap:NoncontrollingInterest0.00.00.00.00.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-483.0-466.0-189.0-219.0-281.0-164.0-144.0-167.0134-332.0110-92.041727791569610249-143.043-90.0-13.0-144.0822323012512110174-13.434772-158.158208145-12.999-236.59
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating-690.0-656.3-273.9-300.0-351.2-200.0-169.4-185.6119.6-332.0107.8-92.0408.826.280.6152.993.282.340.8-149.043.0-89.1-11.2-126.382.022.3219.0120.2123.596.273.3-14.0749.4-158.0217.4165.1-14.00.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-381.0125-118.017334438999439139492103208-140.0126113-129.0150211143156605172360335-702.01001-17.0150-504.027511198235237141528166107203300-345.172402-29.812101258346
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating-544.3176.1-171.0237.0430.0474.4116.5487.8124.1492.0101.0208.0-137.3122.3115.3-126.5145.6170.2119.2162.5605.0170.3310.3293.9-702.0971.8-16.2144.2-514.3261.9101.897.0247.4246.9134.3508.3160.2106.9199.9312.9-334.8401.9-31.1115.7279.40.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value814389195-21.0189-180.0-6.0-235.0-201.0-142.0-189.0-222.0-203.0-181.0-121.0-157.0-194.0-294.0-171.0-104.0-567.0-136.0-245.0-198.0-192.0-212.0-217.0-295.0269-342.0-235.155-274.983-365.506-257.311-166.434-251.48-236.112-63.408
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating1162.9547.9282.6-28.8236.2-219.5-7.1-261.1-179.5-142.0-185.3-222.0-199.0-175.7-123.5-153.9-188.3-237.1-142.5-108.3-567.0-134.7-211.2-173.7-192.0-205.8-206.7-283.7274.5-325.7-231.0-286.1-354.5-257.1-173.7-285.8-255.00.0

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

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-50.048-108.0-67.025238-46.035711922-107.0
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating-71.467.6-156.5-91.8315.046.3-54.138.963.419.021.6-107.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-483.0-466.0-189.0-219.0-281.0-164.0-144.0-167.0134-332.0110-92.041727791569610249-143.043-90.0-13.0-144.0822323012512110174-13.434772-158.158208145-12.999-236.59
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating-690.0-656.3-273.9-300.0-351.2-200.0-169.4-185.6119.6-332.0107.8-92.0408.826.280.6152.993.282.340.8-149.043.0-89.1-11.2-126.382.022.3219.0120.2123.596.273.3-14.0749.4-158.0217.4165.1-14.00.0

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312011-06-302010-06-30
Value981114886183-55.013769142548816175197522081533171974791465942912929720153235515942349384219-144.0-57.7203
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating140.015.5214.5117.8228.8-67.1161.276.7126.854.086.3161.073.5191.353.1203.9148.5255.6164.2499.0146.058.4369.8113.2297.0195.1506.7341.3162.240.0320.2380.2230.5-150.0-56.0219.8

us-gaap:NetIncomeLoss us-gaap:ConsolidatedEntities

us-gaap:VariableInterestEntityPrimaryBeneficiary


Net
Period End2020-09-302020-06-302019-09-302019-06-30
Value-3.00.0-2.06.0
Percentage of NetIncomeLoss-3.50.0-2.94.2
Percentage of InterestAndDividendIncomeOperating-4.10.0-2.25.4
Percentage of InterestAndDividendIncomeOperating us-gaap:VariableInterestEntityPrimaryBeneficiary0.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:FinancialGuarantyVariableInterestEntitiesAndConsolidatedInvestmentVehicles


Net
Period End2021-06-302020-06-302020-03-31
Value4.00.0-4.0
Percentage of NetIncomeLoss4.10.07.3
Percentage of InterestAndDividendIncomeOperating5.70.0-4.9
Percentage of InterestAndDividendIncomeOperating us-gaap:VariableInterestEntityPrimaryBeneficiary ago:FinancialGuarantyVariableInterestEntitiesAndConsolidatedInvestmentVehicles0.00.00.0

Profit Loss

us-gaap:ProfitLoss

us-gaap:ProfitLoss


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1021514989188-58.013669142548816175197522081533171974791465942912929720153235515942349384219-144.074142377-483.0-83.6761-57.667125-183.5164203321
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating145.721.1215.9121.9235.0-70.7160.076.7126.854.086.3161.073.5191.353.1203.9148.5255.6164.2499.0146.058.4369.8113.2297.0195.1506.7341.3162.240.0320.2380.2230.5-150.070.5136.5362.8-482.5-82.1792.1-55.9125.3-191.5187.0219.80.0

us-gaap:ProfitLoss us-gaap:ConsolidatedEntities

us-gaap:VariableInterestEntityPrimaryBeneficiary


Profit
Period End2020-09-302020-06-302019-09-302019-06-30
Value0.05.0-2.06.0
Percentage of ProfitLoss0.02.7-2.94.2
Percentage of InterestAndDividendIncomeOperating0.06.2-2.25.4
Percentage of InterestAndDividendIncomeOperating us-gaap:VariableInterestEntityPrimaryBeneficiary0.00.00.00.0

us-gaap:ProfitLoss us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:FinancialGuarantyVariableInterestEntitiesAndConsolidatedInvestmentVehicles


Profit
Period End2021-06-302021-03-312020-06-302020-03-31
Value8.04.05.0-7.0
Percentage of ProfitLoss7.826.72.712.1
Percentage of InterestAndDividendIncomeOperating11.45.66.2-8.5
Percentage of InterestAndDividendIncomeOperating us-gaap:VariableInterestEntityPrimaryBeneficiary ago:FinancialGuarantyVariableInterestEntitiesAndConsolidatedInvestmentVehicles0.00.00.00.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-381.0125-118.017334438999439139492103208-140.0126113-129.0150211143156605172360335-702.01001-17.0150-504.027511198235237141528166107203300-345.172402-29.812101258346
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating-544.3176.1-171.0237.0430.0474.4116.5487.8124.1492.0101.0208.0-137.3122.3115.3-126.5145.6170.2119.2162.5605.0170.3310.3293.9-702.0971.8-16.2144.2-514.3261.9101.897.0247.4246.9134.3508.3160.2106.9199.9312.9-334.8401.9-31.1115.7279.40.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value814389195-21.0189-180.0-6.0-235.0-201.0-142.0-189.0-222.0-203.0-181.0-121.0-157.0-194.0-294.0-171.0-104.0-567.0-136.0-245.0-198.0-192.0-212.0-217.0-295.0269-342.0-235.155-274.983-365.506-257.311-166.434-251.48-236.112-63.408
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating1162.9547.9282.6-28.8236.2-219.5-7.1-261.1-179.5-142.0-185.3-222.0-199.0-175.7-123.5-153.9-188.3-237.1-142.5-108.3-567.0-134.7-211.2-173.7-192.0-205.8-206.7-283.7274.5-325.7-231.0-286.1-354.5-257.1-173.7-285.8-255.00.0

Repayments Of Long Term Debt

us-gaap:RepaymentsOfLongTermDebt

us-gaap:RepaymentsOfLongTermDebt


Repayments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value0.00.01.0210.00.01.03.028495.0191.0235.01.00.01.01.00.01.01.01.01.01.0111.06.0
Percentage of RepaymentsOfLongTermDebt0.00.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RepaymentsOfLongTermDebt dei:LegalEntity, us-gaap:DebtInstrument, us-gaap:LongtermDebtType, us-gaap:SubsequentEventType

ago:AssuredGuarantyMunicipalHoldingsInc, ago:NotesPayable625Percent, us-gaap:NotesPayableOtherPayables, us-gaap:SubsequentEvent


Repayments
Period End2021-07-09
Value100
Percentage of RepaymentsOfLongTermDebt0.0

ago:AssuredGuarantyMunicipalHoldingsInc, ago:Quibs6875Percent, us-gaap:CorporateDebtSecurities, us-gaap:SubsequentEvent


Repayments
Period End2021-07-09
Value100
Percentage of RepaymentsOfLongTermDebt0.0

us-gaap:RepaymentsOfLongTermDebt dei:LegalEntity, us-gaap:SubsequentEventType

ago:AssuredGuarantyMunicipalHoldingsInc, us-gaap:SubsequentEvent


Repayments
Period End2021-07-09
Value200
Percentage of RepaymentsOfLongTermDebt0.0

Payments Of Dividends Common Stock

us-gaap:PaymentsOfDividendsCommonStock

us-gaap:PaymentsOfDividendsCommonStock


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value17181616172018171920161819181717171917171718171818191818202018191919181816168.2058.2538.2918.2868.3018.2768.3088.305
Percentage of PaymentsOfDividendsCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Payments For Repurchase Of Common Stock

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:PaymentsForRepurchaseOfCommonStock


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-08-312011-09-302010-12-312010-09-30
Value887712640164116160150110801201301501007080135216116556075135135133152152226177355.015205390.0-0.313240.00.023230.00.0
Percentage of PaymentsForRepurchaseOfCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.00.00.0100.0100.00.00.0

us-gaap:PaymentsForRepurchaseOfCommonStock us-gaap:StatementEquityComponents

us-gaap:CommonStock


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value8877126401641161601501117912013015298708013521611655607513513513315215222617735
Percentage of PaymentsForRepurchaseOfCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.998.8100.0100.0101.398.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsForRepurchaseOfCommonStock us-gaap:StatementEquityComponents, us-gaap:SubsequentEventType

us-gaap:CommonStock, us-gaap:SubsequentEvent


Payments
Period End2021-08-052021-05-062021-02-252020-11-052020-08-062020-05-072020-02-272019-11-072019-08-072019-05-092019-03-012018-11-092018-08-022018-05-042018-02-232017-11-022017-08-022017-05-042017-02-232016-11-032016-08-032016-05-042016-02-092015-11-052015-08-052015-05-072015-02-26
Value11855506790169401511297148129149108437011212714255604014213812211692
Percentage of PaymentsForRepurchaseOfCommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Effective Income Tax Rate Continuing Operations

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:EffectiveIncomeTaxRateContinuingOperations


Effective
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value18.5-0.92.5-12.00.1540.071-0.0490.1920.2190.0780.0050.0830.1320.0930.0750.336-0.0190.1470.0510.0030.2690.10.0020.250.2750.2420.0060.2730.2720.388-0.0050.2820.3350.3180.1280.2060.320.306-0.0230.2790.4930.347-0.113-0.0850.309
Percentage of EffectiveIncomeTaxRateContinuingOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice

us-gaap:EmployeeStockOption


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value21.8820.6818.7717.4118.4321.7321.4520.9720.1
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Liabilities

us-gaap:DeferredTaxLiabilities

us-gaap:DeferredTaxLiabilities


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-312018-12-312018-09-302017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value102701003745170.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of DeferredTaxLiabilities100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Proceeds From Sale Of Short Term Investments

us-gaap:ProceedsFromSaleOfShortTermInvestments

us-gaap:ProceedsFromSaleOfShortTermInvestments


Proceeds
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-36.0370.04.00.00.00.02.0220.01.00.0
Percentage of ProceedsFromSaleOfShortTermInvestments100.0100.00.0100.00.00.00.0100.0100.00.0100.00.0

ago:AdjustedIncomeLossAttributabletoParent

ago:AdjustedIncomeLossAttributabletoParent


Adjusted
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value12043564811933877714186
Percentage of AdjustedIncomeLossAttributabletoParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ago:AdjustedIncomeLossAttributabletoParent us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Adjusted
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-34.0-29.0-28.0-18.0-26.0-39.0-32.0-28.0-26.0-25.0
Percentage of AdjustedIncomeLossAttributabletoParent-28.3-67.4-50.0-37.5-21.8-118.2-36.8-36.4-18.4-29.1

us-gaap:MaterialReconcilingItems


Adjusted
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value4.0-5.0-3.00.0-4.0-4.0-2.06.00.0
Percentage of AdjustedIncomeLossAttributabletoParent3.3-8.9-6.20.0-12.1-4.6-2.64.30.0

ago:AdjustedIncomeLossAttributabletoParent us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, ago:AssetManagementSegment


Adjusted
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-06-302019-03-31
Value-2.0-7.0-20.0-12.0-9.0-9.00.00.0
Percentage of AdjustedIncomeLossAttributabletoParent-1.7-16.3-35.7-25.0-7.6-27.30.00.0

us-gaap:OperatingSegments, ago:InsuranceSegment


Adjusted
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value152791098115485133107161111
Percentage of AdjustedIncomeLossAttributabletoParent126.7183.7194.6168.8129.4257.6152.9139.0114.2129.1

ago:AdjustedIncomeLossfromContinuingOperationsbeforeIncomeTaxesNoncontrollingInterestSegmentTotal

ago:AdjustedIncomeLossfromContinuingOperationsbeforeIncomeTaxesNoncontrollingInterestSegmentTotal


Adjusted
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value15355663914440829317998
Percentage of AdjustedIncomeLossfromContinuingOperationsbeforeIncomeTaxesNoncontrollingInterestSegmentTotal100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ago:AdjustedIncomeLossfromContinuingOperationsbeforeIncomeTaxesNoncontrollingInterestSegmentTotal us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Adjusted
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-36.0-32.0-33.0-20.0-32.0-44.0-39.0-31.0-30.0-30.0
Percentage of AdjustedIncomeLossfromContinuingOperationsbeforeIncomeTaxesNoncontrollingInterestSegmentTotal-23.5-58.2-50.0-51.3-22.2-110.0-47.6-33.3-16.8-30.6

us-gaap:MaterialReconcilingItems


Adjusted
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value9.04.0-5.0-1.05.0-8.0-6.0-2.07.00.0
Percentage of AdjustedIncomeLossfromContinuingOperationsbeforeIncomeTaxesNoncontrollingInterestSegmentTotal5.97.3-7.6-2.63.5-20.0-7.3-2.23.90.0

ago:AdjustedIncomeLossfromContinuingOperationsbeforeIncomeTaxesNoncontrollingInterestSegmentTotal us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, ago:AssetManagementSegment


Adjusted
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-06-302019-03-31
Value-3.0-9.0-25.0-15.0-11.0-11.00.00.0
Percentage of AdjustedIncomeLossfromContinuingOperationsbeforeIncomeTaxesNoncontrollingInterestSegmentTotal-2.0-16.4-37.9-38.5-7.6-27.50.00.0

us-gaap:OperatingSegments, ago:InsuranceSegment


Adjusted
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1839212975182103139126202128
Percentage of AdjustedIncomeLossfromContinuingOperationsbeforeIncomeTaxesNoncontrollingInterestSegmentTotal119.6167.3195.5192.3126.4257.5169.5135.5112.8130.6

ago:AdjustmentstoOperatingIncomePreTax

ago:AdjustmentstoOperatingIncomePreTax


Adjustmentsto
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-28.0-40.01084078-102.056-7.03.0-40.0
Percentage of AdjustmentstoOperatingIncomePreTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ago:AdjustmentstoOperatingIncomeTax

ago:AdjustmentstoOperatingIncomeTax


Adjustmentsto
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-6.0-8.0162.014144.01.02.08.0
Percentage of AdjustmentstoOperatingIncomeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ago:AssetManagementFees us-gaap:ConsolidatedEntities

ago:AssetManagementFees

us-gaap:VariableInterestEntityPrimaryBeneficiary


Asset
Period End2020-09-302020-06-302019-06-30
Value-2000000.0-1000000.00
Percentage of AssetManagementFees100.0100.00.0

ago:AssetManagementFees us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:FinancialGuarantyVariableInterestEntitiesAndConsolidatedInvestmentVehicles


Asset
Period End2021-03-312020-03-31
Value-2000000.0-1000000.0
Percentage of AssetManagementFees0.00.0

ago:CommutationsGainLoss

ago:CommutationsGainLoss


Commutations
Period End2020-09-302020-06-302019-09-302019-06-30
Value0.0380.01.0
Percentage of CommutationsGainLoss0.0100.00.0100.0

ago:CommutationsGainLoss us-gaap:CededCreditRisk

ago:Commutations


Commutations
Period End2020-09-302020-06-302019-09-302019-06-30
Value0.0380.01.0
Percentage of CommutationsGainLoss0.0100.00.0100.0

ago:CommutationsIncreaseDecreaseinUnearnedPremiumsNet us-gaap:CededCreditRisk

ago:CommutationsIncreaseDecreaseinUnearnedPremiumsNet

ago:Commutations


Commutations
Period End2020-09-302020-06-302019-09-302019-06-30
Value0-5000000.00-15000000.0
Percentage of CommutationsIncreaseDecreaseinUnearnedPremiumsNet0.0100.00.0100.0

ago:CommutationsIncreaseinNetParOutstanding us-gaap:CededCreditRisk

ago:CommutationsIncreaseinNetParOutstanding

ago:Commutations


Commutations
Period End2020-09-302020-06-302019-09-302019-06-30
Value0.03360.01069
Percentage of CommutationsIncreaseinNetParOutstanding0.0100.00.0100.0

ago:ContributionsFromNoncontrollingInterestsToInvestmentVehicles

ago:ContributionsFromNoncontrollingInterestsToInvestmentVehicles


Contributions
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-06-302019-03-31
Value5.03.0193.043230.00.0
Percentage of ContributionsFromNoncontrollingInterestsToInvestmentVehicles100.0100.0100.0100.0100.0100.00.00.0

ago:CreditDerivativeLosses

ago:CreditDerivativeLosses


Credit
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value1.06.01.02.05.05.0214.0231.01.00.0315.01.0-10.035-4.0-6.02.0648.07.02.012316.01.0260.012710.0623156855640362517-1.713
Percentage of CreditDerivativeLosses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ago:CreditDerivativeLosses us-gaap:ConsolidationItems

us-gaap:MaterialReconcilingItems


Credit
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value2.04.00.0-8.04.010.00.0-1.0
Percentage of CreditDerivativeLosses200.066.70.0-400.080.0200.00.0-25.0

ago:CreditDerivativeRealizedGainLossandOtherSettlements

ago:CreditDerivativeRealizedGainLossandOtherSettlements


Credit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value2.01.01.0-5.00.00.0-3.0-3.0-20.0-1.0-20.01.01.02.0-29.0-1.05.015-18.015248.0-53.06.08.0213.0-14.01519
Percentage of CreditDerivativeRealizedGainLossandOtherSettlements100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ago:CreditDerivativeRealizedGains

ago:CreditDerivativeRealizedGains


Credit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value2.01.02.01.01.02.02.02.01.03.03.02.02.02.02.04.06.05.017111810.01114152315172120282441283233342837414861535051
Percentage of CreditDerivativeRealizedGains100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ago:DebtSecuritiesAvailableforsaleChangeinPresentValueAccretion us-gaap:FinancialInstrument

ago:DebtSecuritiesAvailableforsaleChangeinPresentValueAccretion

ago:PCISecurities


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value1000000.01000000.02000000.01000000.01000000.01000000.0
Percentage of DebtSecuritiesAvailableforsaleChangeinPresentValueAccretion100.0100.0100.0100.0100.0100.0

ago:DistributionsToNoncontrollingInterestsFromInvestmentVehicles

ago:DistributionsToNoncontrollingInterestsFromInvestmentVehicles


Distributions
Period End2021-06-302021-03-312020-09-30
Value2.06.03.0
Percentage of DistributionsToNoncontrollingInterestsFromInvestmentVehicles100.0100.0100.0

ago:EffectiveIncomeTaxRateReconciliationTaxesonReinsuranceAmount

ago:EffectiveIncomeTaxRateReconciliationTaxesonReinsuranceAmount


Effective
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
Value6000000.04000000.0-1000000.00-14000000.05000000.03000000.01000000.06000000.01000000.0-1000000.00-1000000.0-1000000.0-1000000.0
Percentage of EffectiveIncomeTaxRateReconciliationTaxesonReinsuranceAmount100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0

ago:FairValueGainLossOnCommittedCapitalSecurities

ago:FairValueGainLossOnCommittedCapitalSecurities


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-6.0-19.0-14.0-10.0-25.048-18.0-14.019-9.02.0-4.02.0-2.050-23.0-11.0-16.017-15.0232.00.04.0-6.0-9.0149.0-3.0-10.0-6.0-2.04.29-13.904312.4430.5690.5263.4-5.54812-1.275
Percentage of FairValueGainLossOnCommittedCapitalSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ago:FairValueGainLossOnConsolidatedInvestmentVehicles

ago:FairValueGainLossOnConsolidatedInvestmentVehicles


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-06-302019-03-31
Value21164.01831-12.00.00.0
Percentage of FairValueGainLossOnConsolidatedInvestmentVehicles100.0100.0100.0100.0100.0100.00.00.0

ago:FairValueGainLossOnConsolidatedInvestmentVehicles us-gaap:ConsolidatedEntities

us-gaap:VariableInterestEntityPrimaryBeneficiary


Fair
Period End2020-09-302020-06-302019-06-30
Value18310.0
Percentage of FairValueGainLossOnConsolidatedInvestmentVehicles100.0100.00.0

ago:FairValueGainLossOnConsolidatedInvestmentVehicles us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:FinancialGuarantyVariableInterestEntitiesAndConsolidatedInvestmentVehicles


Fair
Period End2021-06-302021-03-312020-06-302020-03-31
Value211631-12.0
Percentage of FairValueGainLossOnConsolidatedInvestmentVehicles100.0100.0100.0100.0

ago:FairValueInputsBankProfit us-gaap:Range, us-gaap:FairValueByLiabilityClass, us-gaap:ValuationTechnique

ago:FairValueInputsBankProfit

srt:WeightedAverage, us-gaap:DerivativeFinancialInstrumentsLiabilities, us-gaap:IncomeApproachValuationTechnique


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-0.0450.836-0.080.99930.00030.0104-0.0005-0.00070.002150.006650.00085-0.00069
Percentage of FairValueInputsBankProfit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ago:FairValueInputsHedgeCost us-gaap:Range, us-gaap:FairValueByLiabilityClass, us-gaap:ValuationTechnique

ago:FairValueInputsHedgeCost

srt:WeightedAverage, us-gaap:DerivativeFinancialInstrumentsLiabilities, us-gaap:IncomeApproachValuationTechnique


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-0.2120.22700.3156-0.00230.0067-0.00060.0002-0.00010.00160.00061-0.0005
Percentage of FairValueInputsHedgeCost100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ago:FairValueInputsYearOneLossEstimates us-gaap:Range, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByLiabilityClass, us-gaap:ValuationTechnique

ago:FairValueInputsYearOneLossEstimates

srt:Maximum, us-gaap:FairValueInputsLevel3, us-gaap:DerivativeFinancialInstrumentsLiabilities, us-gaap:IncomeApproachValuationTechnique


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value20.979.1084.17-0.020.85-0.04-0.30.070.730.020.21
Percentage of FairValueInputsYearOneLossEstimates100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

srt:WeightedAverage, us-gaap:FairValueInputsLevel3, us-gaap:DerivativeFinancialInstrumentsLiabilities, us-gaap:IncomeApproachValuationTechnique


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value0.41.5-0.11.979-0.0020.0230.001-0.006-0.0060.024-0.0010.003
Percentage of FairValueInputsYearOneLossEstimates1.91.90.02.410.02.7-2.52.0-8.63.3-5.01.4

ago:FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetConsolidations us-gaap:FairValueByAssetClass

ago:FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetConsolidations

ago:VariableInterestEntityAssets


Fair
Period End2020-12-312020-09-302020-06-302019-12-312019-09-302017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value0.00.0180.06.0600.0-42.0210.0970.00.00.00.00.01041600.0460.00.00.0
Percentage of FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetConsolidations0.00.0100.00.0100.0100.00.0100.0100.00.0100.00.00.00.00.00.0100.0100.00.0100.00.00.00.0

ago:FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisLiabilityVIEConsolidations us-gaap:FairValueByLiabilityClass

ago:FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisLiabilityVIEConsolidations

ago:VariableInterestLiabilitieswithRecourse


Fair
Period End2020-09-302020-06-302019-09-30
Value0-16000000.05000000.0
Percentage of FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisLiabilityVIEConsolidations0.0100.0100.0

ago:VariableInterestLiabilitieswithoutRecourse


Fair
Period End2020-09-302020-06-302019-09-30
Value0-3000000.01000000.0
Percentage of FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisLiabilityVIEConsolidations0.018.820.0

ago:FinancialGuaranteeInsuranceContractsNetPremiumsReceivableAdjustmentAccretionofDiscountonNetPremiumReceivable

ago:FinancialGuaranteeInsuranceContractsNetPremiumsReceivableAdjustmentAccretionofDiscountonNetPremiumReceivable


Financial
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value-6000000.0-5000000.0-5000000.0-5000000.0-5000000.0-5000000.0-4000000.0-4000000.0-5000000.0-4000000.0-4000000.0-6000000.0-4000000.0-4000000.0-6000000.0-3000000.0-5000000.0-3000000.0-3000000.0-4000000.0-4000000.0-3000000.0-4000000.0-4000000.0-5000000.0-4000000.0-2000000.0-3000000.0
Percentage of FinancialGuaranteeInsuranceContractsNetPremiumsReceivableAdjustmentAccretionofDiscountonNetPremiumReceivable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ago:FinancialGuaranteeInsuranceContractsPremiumsEarnedNet

ago:FinancialGuaranteeInsuranceContractsPremiumsEarnedNet


Financial
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-30
Value101102154107120102121122110117124141135144186161
Percentage of FinancialGuaranteeInsuranceContractsPremiumsEarnedNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ago:FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustmentForeignExchangeTranslation

ago:FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustmentForeignExchangeTranslation


Financial
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value57413.0-58.045-21.0-12.09.0-12.0-9.0-38.02410.019269.0-16.0-3.0-21.0-1.0-7.0-10.017-25.0-15.0
Percentage of FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustmentForeignExchangeTranslation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ago:FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustmentForeignExchangeTranslation us-gaap:ConsolidationItems

us-gaap:MaterialReconcilingItems


Financial
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-57.0-40.0-2.0-57.0-1.020129.0
Percentage of FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustmentForeignExchangeTranslation-100.0-97.6-66.798.3-2.2-95.2-100.0100.0

ago:FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustmentForeignExchangeTranslationSegmentTotal

ago:FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustmentForeignExchangeTranslationSegmentTotal


Financial
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value5.01.057402.0-57.045-20.0-12.09.0
Percentage of FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustmentForeignExchangeTranslationSegmentTotal100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ago:FinancialGuaranteeInsuranceContractsScheduledNetEarnedPremiums

ago:FinancialGuaranteeInsuranceContractsScheduledNetEarnedPremiums


Financial
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value8081848583827881858792959288899697103961019391981041189697105
Percentage of FinancialGuaranteeInsuranceContractsScheduledNetEarnedPremiums100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ago:GuarantorObligationsDecreaseInExcessSpread us-gaap:MortgageLoansOnRealEstateDescriptionLoanCategory, us-gaap:StatementGeographical, us-gaap:UnderlyingAssetClass

ago:GuarantorObligationsDecreaseInExcessSpread

us-gaap:FirstMortgage, country:US, us-gaap:ResidentialMortgageBackedSecurities


Guarantor
Period End2021-03-31
Value53
Percentage of GuarantorObligationsDecreaseInExcessSpread100.0

us-gaap:SecondMortgage, country:US, us-gaap:ResidentialMortgageBackedSecurities


Guarantor
Period End2021-03-31
Value6.0
Percentage of GuarantorObligationsDecreaseInExcessSpread11.3

ago:GuarantorObligationsLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAfterRecoveriesforRepresentationsandWarranties

ago:GuarantorObligationsLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAfterRecoveriesforRepresentationsandWarranties


Guarantor
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value-14.070-14.0334-41.074-6.0267-34.02188.024116-19.04.0209-6.022-6.021433113492002612-238.039-28.010.0
Percentage of GuarantorObligationsLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAfterRecoveriesforRepresentationsandWarranties100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ago:GuarantorObligationsLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAfterRecoveriesforRepresentationsandWarranties us-gaap:StatementGeographical, us-gaap:UnderlyingAssetClass

country:US, ago:PublicFinance


Guarantor
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value8.0926.0336-20.0949.02799.02281125122111122274.0253.0196125.05.0184.02.01068.0246.0
Percentage of GuarantorObligationsLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAfterRecoveriesforRepresentationsandWarranties-57.1131.4-42.9100.648.8127.0-150.0104.5-26.5104.6137.5104.1137.5-584.2300.0108.6-66.7113.6-50.091.636.44.410.29.015.416.7-44.520.5-85.760.0

country:US, us-gaap:ResidentialMortgageBackedSecurities


Guarantor
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value-25.0-22.0-21.0-8.0-23.0-21.0-22.0-13.0-43.0-9.0-7.0-17.0-5.0-130.0-8.0-13.0-14.0-13.0-10.0-5.02085-52.01131818-340.033-55.03.0
Percentage of GuarantorObligationsLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAfterRecoveriesforRepresentationsandWarranties178.6-31.4150.0-2.456.1-28.4366.7-4.9126.5-4.1-87.5-7.1-31.2684.2-200.0-6.2233.3-59.1166.7-2.360.675.2-106.156.569.2150.0142.984.6196.430.0

us-gaap:NonUs, ago:PublicFinance


Guarantor
Period End2021-06-302020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value1.00.0-1.00.00.00.00.00.0
Percentage of GuarantorObligationsLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAfterRecoveriesforRepresentationsandWarranties-7.10.02.40.00.0-0.00.00.0

ago:GuarantorObligationsLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAfterRecoveriesforRepresentationsandWarranties us-gaap:UnderlyingAssetClass

ago:OtherStructuredFinance


Guarantor
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value2.00.06.03.01.07.01.00.0-1.03.07.0-1.00.05.0-2.01.010.010.00.01.014941.0-3.0-3.01.0-4.02.00.0
Percentage of GuarantorObligationsLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAfterRecoveriesforRepresentationsandWarranties-14.3-0.01.8-7.31.4-116.70.4-0.0-0.537.52.9-6.2-0.0125.0-1.0-16.745.5-166.70.03.012.4191.80.5-11.5-25.0-0.4-10.3-7.10.0

ago:PublicFinance


Guarantor
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value9.0927.0336-21.0949.02799.02281225122111122224.0253.0196125.05.0184.02.01068.0246.0
Percentage of GuarantorObligationsLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAfterRecoveriesforRepresentationsandWarranties-64.3131.4-50.0100.651.2127.0-150.0104.5-26.5104.6150.0104.1137.5-584.2300.0106.2-66.7113.6-50.091.636.44.410.29.015.416.7-44.520.5-85.760.0

us-gaap:StructuredFinance


Guarantor
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value-23.0-22.0-21.0-2.0-20.0-20.0-15.0-12.0-43.0-10.0-4.0-10.0-6.0-130.0-8.0-13.0-10.0-3.0-9.01821108441822216-344.031-52.04.0
Percentage of GuarantorObligationsLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAfterRecoveriesforRepresentationsandWarranties164.3-31.4150.0-0.648.8-27.0250.0-4.5126.5-4.6-50.0-4.1-37.5684.2-200.0-6.2166.7-13.6150.08.463.695.689.891.084.6133.3144.579.5185.740.0

ago:GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarranties

ago:GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarranties


Guarantor
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value-20.013447034-3.01325-37.0-2.00.00.019-24.0152044747102-44.02259133-3.0192-3.0-2.0-63.02312
Percentage of GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarranties100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ago:GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarrantiesAccretionOfDiscount

ago:GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarrantiesAccretionOfDiscount


Guarantor
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
Value2.01.02.01.02.04.03.05.06.08.09.010.09.08.09.08.08.08.06.05.06.09.08.010.07.07.0
Percentage of GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarrantiesAccretionOfDiscount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ago:GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarrantiesChangesInDiscountRates

ago:GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarrantiesChangesInDiscountRates


Guarantor
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
Value15-48.0-17.0-2.01.031-7.01.0-1.0-4.0-2.0-9.00.0-6.0-3.0-6.02311-94.0-29.045636.011-47.07.0
Percentage of GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarrantiesChangesInDiscountRates100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ago:GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarrantiesChangesInDiscountRates us-gaap:MortgageLoansOnRealEstateDescriptionLoanCategory, us-gaap:StatementGeographical, us-gaap:UnderlyingAssetClass

us-gaap:FirstMortgage, country:US, us-gaap:ResidentialMortgageBackedSecurities


Guarantor
Period End2021-03-312020-12-312020-09-302020-06-302020-03-31
Value26411.00.0-25.0
Percentage of GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarrantiesChangesInDiscountRates-54.2-241.2-50.00.0-80.6

us-gaap:SecondMortgage, country:US, us-gaap:ResidentialMortgageBackedSecurities


Guarantor
Period End2021-03-31
Value8.0
Percentage of GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarrantiesChangesInDiscountRates-16.7

ago:GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarrantiesChangesInTimingAndAssumptions

ago:GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarrantiesChangesInTimingAndAssumptions


Guarantor
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
Value-37.060597131-38.01719-42.0-6.0-7.0-1.010.0-26.09.02021628190-20.0-29.0-13.0119-24.0232-17.0
Percentage of GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarrantiesChangesInTimingAndAssumptions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ago:GuarantorObligationsNetExpectedLosstobePaidAfterRecoveriesforRepresentationsandWarrantiesPercent us-gaap:StatementGeographical

ago:GuarantorObligationsNetExpectedLosstobePaidAfterRecoveriesforRepresentationsandWarrantiesPercent

ago:NonUnitedStates


Guarantor
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
Value-0.35.0-0.26.96100.039-0.0080.017-0.0090.032-0.0050.003-0.0060.035
Percentage of GuarantorObligationsNetExpectedLosstobePaidAfterRecoveriesforRepresentationsandWarrantiesPercent100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ago:GuarantorObligationsProjectedLossAssumptionsIncreaseDecreaseinExpectedLosstobePaidNet us-gaap:MortgageLoansOnRealEstateDescriptionLoanCategory, us-gaap:StatementGeographical, us-gaap:StatementScenario, us-gaap:UnderlyingAssetClass

ago:GuarantorObligationsProjectedLossAssumptionsIncreaseDecreaseinExpectedLosstobePaidNet

us-gaap:FirstMortgage, country:US, ago:LeastStressfulEnvironment, us-gaap:ResidentialMortgageBackedSecurities


Guarantor
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
Value-2.027-6.0-2.0-2.049-6.03.03.038-2.0-3.0-3.041
Percentage of GuarantorObligationsProjectedLossAssumptionsIncreaseDecreaseinExpectedLosstobePaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FirstMortgage, country:US, ago:MoreStressfulEnvironment, us-gaap:ResidentialMortgageBackedSecurities


Guarantor
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
Value-2.034-5.0-2.00.046-6.0-5.00.054-3.0-7.0-1.065
Percentage of GuarantorObligationsProjectedLossAssumptionsIncreaseDecreaseinExpectedLosstobePaidNet100.0125.983.3100.0-0.093.9100.0-166.70.0142.1150.0233.333.3158.5

ago:GuarantorObligationsRecoveriesReceived us-gaap:MortgageLoansOnRealEstateDescriptionLoanCategory, us-gaap:StatementGeographical, us-gaap:UnderlyingAssetClass

ago:GuarantorObligationsRecoveriesReceived

us-gaap:SecondMortgage, country:US, us-gaap:ResidentialMortgageBackedSecurities


Guarantor
Period End2020-09-30
Value15
Percentage of GuarantorObligationsRecoveriesReceived100.0

ago:IncomeLossfromContinuingOperationsbeforeEquityMethodInvestmentsIncomeTaxesNoncontrollingInterestSegmentTotal

ago:IncomeLossfromContinuingOperationsbeforeEquityMethodInvestmentsIncomeTaxesNoncontrollingInterestSegmentTotal


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value11946423214444819317896
Percentage of IncomeLossfromContinuingOperationsbeforeEquityMethodInvestmentsIncomeTaxesNoncontrollingInterestSegmentTotal100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ago:IncomeLossfromContinuingOperationsbeforeEquityMethodInvestmentsIncomeTaxesNoncontrollingInterestSegmentTotal us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-36.0-32.0-32.0-20.0-32.0-39.0-39.0-30.0-30.0-31.0
Percentage of IncomeLossfromContinuingOperationsbeforeEquityMethodInvestmentsIncomeTaxesNoncontrollingInterestSegmentTotal-30.3-69.6-76.2-62.5-22.2-88.6-48.1-32.3-16.9-32.3

us-gaap:MaterialReconcilingItems


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value2314-6.01231-18.0-8.0-2.07.00.0
Percentage of IncomeLossfromContinuingOperationsbeforeEquityMethodInvestmentsIncomeTaxesNoncontrollingInterestSegmentTotal19.330.4-14.337.521.5-40.9-9.9-2.23.90.0

ago:IncomeLossfromContinuingOperationsbeforeEquityMethodInvestmentsIncomeTaxesNoncontrollingInterestSegmentTotal us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, ago:AssetManagementSegment


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-06-302019-03-31
Value-3.0-9.0-25.0-15.0-11.0-11.00.00.0
Percentage of IncomeLossfromContinuingOperationsbeforeEquityMethodInvestmentsIncomeTaxesNoncontrollingInterestSegmentTotal-2.5-19.6-59.5-46.9-7.6-25.00.00.0

us-gaap:OperatingSegments, ago:InsuranceSegment


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1357310555156112140125201127
Percentage of IncomeLossfromContinuingOperationsbeforeEquityMethodInvestmentsIncomeTaxesNoncontrollingInterestSegmentTotal113.4158.7250.0171.9108.3254.5172.8134.4112.9132.3

ago:InsuredFinancialObligationsClaimLiabilityRiskFreeDiscountRate us-gaap:Range

ago:InsuredFinancialObligationsClaimLiabilityRiskFreeDiscountRate

srt:Maximum


Insured
Period End2021-06-302021-03-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-0.352.490.00080.01390.0025-0.0043-0.00240.0287-0.00140.0017
Percentage of InsuredFinancialObligationsClaimLiabilityRiskFreeDiscountRate100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ago:InsuredFinancialObligationsClaimLiabilityWeightedAverageRiskFreeDiscountRate

ago:InsuredFinancialObligationsClaimLiabilityWeightedAverageRiskFreeDiscountRate


Insured
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-0.150.880.060.5343-0.00070.00640.0015-0.0031-0.00360.0246-0.00290.00180.00030.02820.0011-0.0005-0.00330.0265
Percentage of InsuredFinancialObligationsClaimLiabilityWeightedAverageRiskFreeDiscountRate100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ago:InsuredFinancialObligationsLiabilityforUnpaidClaimsAdjustmentExpenseClaimsPaid

ago:InsuredFinancialObligationsLiabilityforUnpaidClaimsAdjustmentExpenseClaimsPaid


Insured
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value6.04.05.0116.03.0127.09.07.0116.06.05.08.07.07.02.04.03.07.02.09.07.05.04.0176.08.06.0
Percentage of InsuredFinancialObligationsLiabilityforUnpaidClaimsAdjustmentExpenseClaimsPaid100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ago:InsuredFinancialObligationsRefundedDuringPeriod ago:LoansInsuredOrGuaranteeForGovernmentAuthorities, us-gaap:CounterpartyName, us-gaap:StatementGeographical

ago:InsuredFinancialObligationsRefundedDuringPeriod

ago:PublicCorporations, ago:PuertoRicoAqueductandSewerAuthority, country:PR


Insured
Period End2020-12-31
Value372
Percentage of InsuredFinancialObligationsRefundedDuringPeriod100.0

ago:LossEstimateSensitivityAnalysisChangeInEstimateForDecreasedConditionalDefaultRateRampDownPeriod us-gaap:MortgageLoansOnRealEstateDescriptionLoanCategory, us-gaap:StatementGeographical, us-gaap:StatementScenario, us-gaap:FinancialInstrument, us-gaap:UnderlyingAssetClass

ago:LossEstimateSensitivityAnalysisChangeInEstimateForDecreasedConditionalDefaultRateRampDownPeriod

us-gaap:SecondMortgage, country:US, ago:BasedScenarioTwo, us-gaap:HomeEquity, us-gaap:ResidentialMortgageBackedSecurities


Loss
Period End2021-06-302021-03-312020-12-31
Value0.07.0-1.0
Percentage of LossEstimateSensitivityAnalysisChangeInEstimateForDecreasedConditionalDefaultRateRampDownPeriod0.0100.0100.0

ago:LossEstimateSensitivityAnalysisChangeInEstimateForIncreasedConditionalDefaultRatePlateauPeriod us-gaap:MortgageLoansOnRealEstateDescriptionLoanCategory, us-gaap:StatementGeographical, us-gaap:StatementScenario, us-gaap:FinancialInstrument, us-gaap:UnderlyingAssetClass

ago:LossEstimateSensitivityAnalysisChangeInEstimateForIncreasedConditionalDefaultRatePlateauPeriod

us-gaap:SecondMortgage, country:US, ago:BaseScenarioOne, us-gaap:HomeEquity, us-gaap:ResidentialMortgageBackedSecurities


Loss
Period End2021-06-302021-03-312020-12-31
Value-1.07.0-1.0
Percentage of LossEstimateSensitivityAnalysisChangeInEstimateForIncreasedConditionalDefaultRatePlateauPeriod100.0100.0100.0

ago:NonRedeemableNoncontrollingInterestEquityOtherReallocationofOwnershipInterests

ago:NonRedeemableNoncontrollingInterestEquityOtherReallocationofOwnershipInterests


Non
Period End2020-12-312020-09-302020-06-30
Value00-8000000.0
Percentage of NonRedeemableNoncontrollingInterestEquityOtherReallocationofOwnershipInterests0.00.0100.0

ago:NonRedeemableNoncontrollingInterestEquityOtherReallocationofOwnershipInterests us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest


Non
Period End2020-12-312020-09-302020-06-30
Value00-8000000.0
Percentage of NonRedeemableNoncontrollingInterestEquityOtherReallocationofOwnershipInterests0.00.0100.0

ago:NoncashCompensationandOperatingExpensesSegment

ago:NoncashCompensationandOperatingExpensesSegment


Noncash
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value321415151510.01112
Percentage of NoncashCompensationandOperatingExpensesSegment100.0100.0100.0100.0100.0100.0100.0100.0

ago:NoncashCompensationandOperatingExpensesSegment us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Noncash
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value2.01.00.03.02.01.02.01.0
Percentage of NoncashCompensationandOperatingExpensesSegment6.27.10.020.013.310.018.28.3

ago:NoncashCompensationandOperatingExpensesSegment us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, ago:AssetManagementSegment


Noncash
Period End2020-12-312020-09-302020-06-302020-03-312019-06-302019-03-31
Value184.06.03.00.00.0
Percentage of NoncashCompensationandOperatingExpensesSegment56.228.640.020.00.00.0

us-gaap:OperatingSegments, ago:InsuranceSegment


Noncash
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value129.09.09.010.09.09.011
Percentage of NoncashCompensationandOperatingExpensesSegment37.564.360.060.066.790.081.891.7

ago:OtherComprehensiveIncomeLossAvailableforsaleSecuritiesWithCreditImpairmentNetofTax

ago:OtherComprehensiveIncomeLossAvailableforsaleSecuritiesWithCreditImpairmentNetofTax


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value24-6.08.025-52.0-9.0-48.05.0
Percentage of OtherComprehensiveIncomeLossAvailableforsaleSecuritiesWithCreditImpairmentNetofTax100.0100.0100.0100.0100.0100.0100.0100.0

ago:OtherComprehensiveIncomeLossAvailableforsaleSecuritiesWithCreditImpairmentTax

ago:OtherComprehensiveIncomeLossAvailableforsaleSecuritiesWithCreditImpairmentTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value6.0-1.0-9.0-2.0-6.013-28.02.0120.0
Percentage of OtherComprehensiveIncomeLossAvailableforsaleSecuritiesWithCreditImpairmentTax100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

ago:OtherComprehensiveIncomeLossAvailableforsaleSecuritiesWithoutCreditImpairmentNetofTax

ago:OtherComprehensiveIncomeLossAvailableforsaleSecuritiesWithoutCreditImpairmentNetofTax


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value51-119.067175-162.03379163
Percentage of OtherComprehensiveIncomeLossAvailableforsaleSecuritiesWithoutCreditImpairmentNetofTax100.0100.0100.0100.0100.0100.0100.0100.0

ago:OtherComprehensiveIncomeLossAvailableforsaleSecuritiesWithoutCreditImpairmentTax

ago:OtherComprehensiveIncomeLossAvailableforsaleSecuritiesWithoutCreditImpairmentTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value10.0-20.09.07.031-27.0-5.07.01925
Percentage of OtherComprehensiveIncomeLossAvailableforsaleSecuritiesWithoutCreditImpairmentTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ago:OtherComprehensiveIncomeLossOtherNetofTaxPortionAttributableToParent

ago:OtherComprehensiveIncomeLossOtherNetofTaxPortionAttributableToParent


Other
Period End2021-06-302021-03-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value-1.01.00.00.0-1.00.0-1.00.0-2.0-3.0-9.06.0-1.03.010.02.0-8.0-5.0-9.0-2.0-3.0-4.06.0
Percentage of OtherComprehensiveIncomeLossOtherNetofTaxPortionAttributableToParent100.0100.00.00.0100.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ago:PaydownOfFinancialGuarantyVariableInterestEntitiesLiabilities

ago:PaydownOfFinancialGuarantyVariableInterestEntitiesLiabilities


Paydown
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value10.013141117351967702526292833333838484436489429244393948373028110212012216717116419519222323635124115323721346
Percentage of PaydownOfFinancialGuarantyVariableInterestEntitiesLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ago:PaymentsforProceedsfromShorttermInvestmentswithMaturitiesofLessThanThreeMonths

ago:PaymentsforProceedsfromShorttermInvestmentswithMaturitiesofLessThanThreeMonths


Paymentsfor
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-30
Value387-120.072-112.0-375.015
Percentage of PaymentsforProceedsfromShorttermInvestmentswithMaturitiesofLessThanThreeMonths100.0100.0100.0100.0100.0100.0

ago:PercentageIncreaseInCommonStockDividends us-gaap:SubsequentEventType

ago:PercentageIncreaseInCommonStockDividends

us-gaap:SubsequentEvent


Percentage
Period End2021-02-242015-02-042014-02-05
Value10.00.090.1
Percentage of PercentageIncreaseInCommonStockDividends100.0100.0100.0

ago:PremiumsEarnedNetSpecialtyInsuranceandReinsurance

ago:PremiumsEarnedNetSpecialtyInsuranceandReinsurance


Premiums
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1000000.01000000.0001000000.01000000.02000000.01000000.02000000.01000000.0
Percentage of PremiumsEarnedNetSpecialtyInsuranceandReinsurance100.0100.00.00.0100.0100.0100.0100.0100.0100.0

ago:ProceedsfromPaydownsonFinancialGuarantyVariableInterestEntitiesAssets

ago:ProceedsfromPaydownsonFinancialGuarantyVariableInterestEntitiesAssets


Proceedsfrom
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
Value131416121837206924262630
Percentage of ProceedsfromPaydownsonFinancialGuarantyVariableInterestEntitiesAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ago:RedeemableNoncontrollingInterestEquityOtherContributionstoInvestmentVehicles

ago:RedeemableNoncontrollingInterestEquityOtherContributionstoInvestmentVehicles


Redeemable
Period End2020-09-302020-06-30
Value0.020
Percentage of RedeemableNoncontrollingInterestEquityOtherContributionstoInvestmentVehicles0.0100.0

ago:RedeemableNoncontrollingInterestEquityOtherReallocationofOwnershipInterests

ago:RedeemableNoncontrollingInterestEquityOtherReallocationofOwnershipInterests


Redeemable
Period End2020-09-302020-06-30
Value0-8000000.0
Percentage of RedeemableNoncontrollingInterestEquityOtherReallocationofOwnershipInterests0.0100.0

ago:ReinsuranceRetentionPolicyReinsuredRiskPotentialPaymentsDuetoThirdPartiesAmount dei:LegalEntity

ago:ReinsuranceRetentionPolicyReinsuredRiskPotentialPaymentsDuetoThirdPartiesAmount

ago:AssuredGuarantyCorp


Reinsurance
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
Value-9.0-1.0-6.0254-4.0-11.0-10.0312-21.0-9.033917-1.0-1.01.016-3.0-11.0-1.033-3.0-3.0-8.048
Percentage of ReinsuranceRetentionPolicyReinsuredRiskPotentialPaymentsDuetoThirdPartiesAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ago:AssuredGuarantyRe


Reinsurance
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
Value-2.01.00.041-2.02.0-1.0410.00.0-2.044-3.0-2.09.042-6.02.0-1.050-17.0-4.0-5.081
Percentage of ReinsuranceRetentionPolicyReinsuredRiskPotentialPaymentsDuetoThirdPartiesAmount22.2-100.0-0.016.150.0-18.210.013.1-0.0-0.0-0.6258.8300.0200.0900.0262.5200.0-18.2100.0151.5566.7133.362.5168.8

ago:RepaymentofWarehouseLoansandEquity

ago:RepaymentofWarehouseLoansandEquity


Repaymentof
Period End2021-06-302021-03-31
Value274476
Percentage of RepaymentofWarehouseLoansandEquity100.0100.0

ago:RevenueIncludingAdjustments

ago:RevenueIncludingAdjustments


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value230220273232294190244223263234
Percentage of RevenueIncludingAdjustments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ago:RevenueIncludingAdjustments us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Revenue
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1.0120.0-4.01.01.01.00.0
Percentage of RevenueIncludingAdjustments0.45.20.0-2.10.40.40.40.0

us-gaap:IntersegmentElimination


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-4.0-4.0-4.0-4.0-3.0-4.0-3.0-1.00.0-1.0
Percentage of RevenueIncludingAdjustments-1.7-1.8-1.5-1.7-1.0-2.1-1.2-0.40.0-0.4

us-gaap:MaterialReconcilingItems


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value3125112138-15.04.01.0211.0
Percentage of RevenueIncludingAdjustments13.511.44.09.112.9-7.91.60.48.00.4

ago:RevenueIncludingAdjustments us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:IntersegmentElimination, ago:AssetManagementSegment


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-06-30
Value2.02.02.01.01.01.00.0
Percentage of RevenueIncludingAdjustments0.90.90.70.40.30.50.0

us-gaap:IntersegmentElimination, ago:InsuranceSegment


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value2.02.02.03.02.03.03.01.00.01.0
Percentage of RevenueIncludingAdjustments0.90.90.71.30.71.61.20.40.00.4

us-gaap:OperatingSegments, ago:AssetManagementSegment


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-06-302019-03-31
Value1918201312160.00.0
Percentage of RevenueIncludingAdjustments8.38.27.35.64.18.40.00.0

us-gaap:OperatingSegments, ago:InsuranceSegment


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value180177241186244193217221241233
Percentage of RevenueIncludingAdjustments78.380.588.380.283.0101.688.999.191.699.6

ago:SegmentBenefitsLossesAndExpenses

ago:SegmentBenefitsLossesAndExpenses


Segment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value11117423120015014616313085138
Percentage of SegmentBenefitsLossesAndExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ago:SegmentBenefitsLossesAndExpenses us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Segment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value36323332323540313131
Percentage of SegmentBenefitsLossesAndExpenses32.418.414.316.021.324.024.523.836.522.5

us-gaap:MaterialReconcilingItems


Segment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value4.07.0135.04.0-1.09.02.0140.0
Percentage of SegmentBenefitsLossesAndExpenses3.64.05.62.52.7-0.75.51.516.50.0

ago:SegmentBenefitsLossesAndExpenses us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, ago:AssetManagementSegment


Segment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-06-302019-03-31
Value2429472924280.00.0
Percentage of SegmentBenefitsLossesAndExpenses21.616.720.314.516.019.20.00.0

us-gaap:OperatingSegments, ago:InsuranceSegment


Segment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value471061381349084809740107
Percentage of SegmentBenefitsLossesAndExpenses42.360.959.767.060.057.549.174.647.177.5

ago:SegmentIncomeTaxExpenseBenefit

ago:SegmentIncomeTaxExpenseBenefit


Segment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value298.09.0-12.02010.0-4.0163812
Percentage of SegmentIncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ago:SegmentIncomeTaxExpenseBenefit us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Segment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-2.0-3.0-5.0-2.0-6.0-5.0-7.0-3.0-4.0-5.0
Percentage of SegmentIncomeTaxExpenseBenefit-6.9-37.5-55.616.7-30.0-50.0175.0-18.8-10.5-41.7

us-gaap:MaterialReconcilingItems


Segment
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1.0-1.0-1.00.0-1.0-1.00.01.00.0
Percentage of SegmentIncomeTaxExpenseBenefit3.4-11.18.30.0-10.025.00.02.60.0

ago:SegmentIncomeTaxExpenseBenefit us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, ago:AssetManagementSegment


Segment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-06-302019-03-31
Value-1.0-2.0-5.0-3.0-2.0-2.00.00.0
Percentage of SegmentIncomeTaxExpenseBenefit-3.4-25.0-55.625.0-10.0-20.00.00.0

us-gaap:OperatingSegments, ago:InsuranceSegment


Segment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value311320-6.028186.0194117
Percentage of SegmentIncomeTaxExpenseBenefit106.9162.5222.250.0140.0180.0-150.0118.8107.9141.7

ago:SegmentRevenueIncludingAdjustments

ago:SegmentRevenueIncludingAdjustments


Segment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value230220273232294190244223263234
Percentage of SegmentRevenueIncludingAdjustments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ago:SegmentRevenueIncludingAdjustments us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Segment
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1.0120.0-4.01.01.01.00.0
Percentage of SegmentRevenueIncludingAdjustments0.45.20.0-2.10.40.40.40.0

us-gaap:MaterialReconcilingItems


Segment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value27217.01735-19.01.00.0210.0
Percentage of SegmentRevenueIncludingAdjustments11.79.52.67.311.9-10.00.40.08.00.0

ago:SegmentRevenueIncludingAdjustments us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, ago:AssetManagementSegment


Segment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-06-302019-03-31
Value2120221413170.00.0
Percentage of SegmentRevenueIncludingAdjustments9.19.18.16.04.48.90.00.0

us-gaap:OperatingSegments, ago:InsuranceSegment


Segment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value182179243189246196220222241234
Percentage of SegmentRevenueIncludingAdjustments79.181.489.081.583.7103.290.299.691.6100.0

ago:SegmentRevenueIncludingAdjustments us-gaap:StatementGeographical

ago:UnitedKingdomandOther


Segment
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value13136.010.08.05.08.0
Percentage of SegmentRevenueIncludingAdjustments5.64.43.24.13.61.93.4

country:BM


Segment
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value5033383433434644
Percentage of SegmentRevenueIncludingAdjustments18.314.212.917.913.519.317.518.8

country:US


Segment
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value209186243150201172212182
Percentage of SegmentRevenueIncludingAdjustments76.680.282.778.982.477.180.677.8

ago:TaxCutsandJobsActof2017IncompleteAccountingTransitionTaxforAccumulatedForeignEarningsTaxCreditRealized

ago:TaxCutsandJobsActof2017IncompleteAccountingTransitionTaxforAccumulatedForeignEarningsTaxCreditRealized


Tax
Period End2021-06-302021-03-31
Value0.024
Percentage of TaxCutsandJobsActof2017IncompleteAccountingTransitionTaxforAccumulatedForeignEarningsTaxCreditRealized0.0100.0

ago:VariableInterestEntityChangeinFairValue

ago:VariableInterestEntityChangeinFairValue


Variable
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value5.0-2.00.01.0-9.00.04.0335.03.05.02.04.05.03.01210.027-11.04.018382.05.0-7.02350
Percentage of VariableInterestEntityChangeinFairValue100.0100.00.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ago:VariableInterestEntityChangeinFairValue us-gaap:ConsolidatedEntities

us-gaap:VariableInterestEntityPrimaryBeneficiary


Variable
Period End2020-09-302020-06-302019-09-302019-06-30
Value0.01.04.033
Percentage of VariableInterestEntityChangeinFairValue0.0100.0100.0100.0

ago:VariableInterestEntityChangeinFairValue us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass

us-gaap:VariableInterestEntityPrimaryBeneficiary, ago:FinancialGuarantyVariableInterestEntitiesAndConsolidatedInvestmentVehicles


Variable
Period End2021-06-302021-03-312020-06-302020-03-31
Value8.05.01.0-9.0
Percentage of VariableInterestEntityChangeinFairValue0.0100.0100.0100.0

ago:VariableInterestEntityChangeinFairValue us-gaap:FairValueByAssetClass

ago:ConsolidatedInvestmentVehicles


Variable
Period End2020-09-302020-06-302020-03-31
Value0.01.012
Percentage of VariableInterestEntityChangeinFairValue0.0100.0-133.3

us-gaap:AssumedPremiumsEarned

us-gaap:AssumedPremiumsEarned


Assumed
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value8.08.0138.010.010.01212151518199.05.07.06.08.06.08.06.05.08.0117.01210.015129.01114121.013111312
Percentage of AssumedPremiumsEarned100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssumedPremiumsWritten

us-gaap:AssumedPremiumsWritten


Assumed
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value2.010.0-1.01.00.0112.01.00.00.0-7.03310.02.0-1.07.02.0-2.0-1.0-6.0-2.016-1.0-1.03.0-6.0-5.00.0-1.00.0-2.021-2.0-4.00.0-14.3263.7-15.3-9.9-42.0-94.9-14.1-10.1
Percentage of AssumedPremiumsWritten100.0100.0100.0100.00.0100.0100.0100.00.00.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssumptionForFairValueOnSecuritizationDateOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPrepaymentSpeed us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:MeasurementInputType, us-gaap:ValuationTechnique

us-gaap:AssumptionForFairValueOnSecuritizationDateOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPrepaymentSpeed

ago:EquitySecuritiesandWarrants, us-gaap:FairValueInputsLevel3, us-gaap:MeasurementInputRevenueMultiple, us-gaap:IncomeApproachValuationTechnique


Assumption
Period End2020-09-30
Value65.34
Percentage of AssumptionForFairValueOnSecuritizationDateOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPrepaymentSpeed100.0

us-gaap:DebtSecurities, us-gaap:FairValueInputsLevel3, us-gaap:MeasurementInputEbitdaMultiple, us-gaap:IncomeApproachValuationTechnique


Assumption
Period End2020-09-30
Value99.0
Percentage of AssumptionForFairValueOnSecuritizationDateOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPrepaymentSpeed151.5

us-gaap:DebtSecurities, us-gaap:FairValueInputsLevel3, us-gaap:MeasurementInputRevenueMultiple, us-gaap:IncomeApproachValuationTechnique


Assumption
Period End2020-09-30
Value65.34
Percentage of AssumptionForFairValueOnSecuritizationDateOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPrepaymentSpeed100.0

us-gaap:AssumptionForFairValueOnSecuritizationDateOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPrepaymentSpeed us-gaap:Range, us-gaap:CreditDerivativesByContractType, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:MeasurementInputType

srt:Maximum, us-gaap:CreditDefaultSwap, us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring, us-gaap:MeasurementInputDefaultRate


Assumption
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
Value-0.612.520.271.0511-0.00580.0147-0.0005-0.0024-0.00270.0264-0.00280.0023
Percentage of AssumptionForFairValueOnSecuritizationDateOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPrepaymentSpeed0.00.00.01.60.00.00.00.00.00.00.00.0

srt:Minimum, us-gaap:CreditDefaultSwap, us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring, us-gaap:MeasurementInputDefaultRate


Assumption
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
Value-0.010.11-0.030.2177-0.00230.00460.0019-0.0025-0.00590.02340.00030.0003
Percentage of AssumptionForFairValueOnSecuritizationDateOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPrepaymentSpeed0.00.00.00.30.00.00.00.00.00.00.00.0

us-gaap:AssumptionForFairValueOnSecuritizationDateOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPrepaymentSpeed us-gaap:Range, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:MeasurementInputType, us-gaap:ValuationTechnique

srt:Maximum, ago:EquitySecuritiesandWarrants, us-gaap:FairValueInputsLevel3, us-gaap:MeasurementInputEbitdaMultiple, us-gaap:IncomeApproachValuationTechnique


Assumption
Period End2020-09-30
Value99.0
Percentage of AssumptionForFairValueOnSecuritizationDateOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPrepaymentSpeed151.5

srt:Maximum, ago:FinancialGuaranteeVariableInterestEntities, us-gaap:FairValueInputsLevel3, us-gaap:MeasurementInputDefaultRate, us-gaap:IncomeApproachValuationTechnique


Assumption
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
Value-1.228.11.025.3350.0160.249-0.010.0150.0020.240.0020.003
Percentage of AssumptionForFairValueOnSecuritizationDateOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPrepaymentSpeed0.00.00.038.80.00.00.00.00.00.00.00.0

srt:Maximum, ago:FinancialGuaranteeVariableInterestEntities, us-gaap:FairValueInputsLevel3, us-gaap:MeasurementInputLossSeverity, us-gaap:IncomeApproachValuationTechnique


Assumption
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
Value0100.0099.001.00001.000
Percentage of AssumptionForFairValueOnSecuritizationDateOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPrepaymentSpeed0.00.00.0151.50.00.00.00.00.00.00.00.0

srt:Maximum, ago:FinancialGuaranteeVariableInterestEntities, us-gaap:FairValueInputsLevel3, us-gaap:MeasurementInputPrepaymentRate, us-gaap:IncomeApproachValuationTechnique


Assumption
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
Value0.119.20.118.7120.0010.1870.0020.00100.1830.006-0.003
Percentage of AssumptionForFairValueOnSecuritizationDateOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPrepaymentSpeed0.00.00.028.60.00.00.00.00.00.00.00.0

srt:Maximum, us-gaap:ResidentialMortgageBackedSecurities, us-gaap:FairValueInputsLevel3, us-gaap:MeasurementInputDefaultRate, us-gaap:IncomeApproachValuationTechnique


Assumption
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
Value7.18.9-1.511.32500.0750.001000.069-0.0190.017
Percentage of AssumptionForFairValueOnSecuritizationDateOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPrepaymentSpeed0.00.00.017.30.00.00.00.00.00.00.00.0

srt:Maximum, us-gaap:ResidentialMortgageBackedSecurities, us-gaap:FairValueInputsLevel3, us-gaap:MeasurementInputLossSeverity, us-gaap:IncomeApproachValuationTechnique


Assumption
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
Value0125.00123.7501.250001.2500
Percentage of AssumptionForFairValueOnSecuritizationDateOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPrepaymentSpeed0.00.00.0189.40.00.00.00.00.00.00.00.0

srt:Maximum, us-gaap:ResidentialMortgageBackedSecurities, us-gaap:FairValueInputsLevel3, us-gaap:MeasurementInputPrepaymentRate, us-gaap:IncomeApproachValuationTechnique


Assumption
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
Value-10.030.015.014.8500.15-0.019-0.0130.0240.1580.0140.002
Percentage of AssumptionForFairValueOnSecuritizationDateOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPrepaymentSpeed0.00.00.022.70.00.00.00.00.00.00.00.0

srt:Minimum, ago:EquitySecuritiesandWarrants, us-gaap:FairValueInputsLevel3, us-gaap:MeasurementInputEbitdaMultiple, us-gaap:IncomeApproachValuationTechnique


Assumption
Period End2020-09-30
Value791.9
Percentage of AssumptionForFairValueOnSecuritizationDateOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPrepaymentSpeed1212.0

srt:Minimum, ago:FinancialGuaranteeVariableInterestEntities, us-gaap:FairValueInputsLevel3, us-gaap:MeasurementInputDefaultRate, us-gaap:IncomeApproachValuationTechnique


Assumption
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
Value0.31.20.11.78800.0120-0.00100.01300
Percentage of AssumptionForFairValueOnSecuritizationDateOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPrepaymentSpeed0.00.00.02.70.00.00.00.00.00.00.00.0

srt:Minimum, ago:FinancialGuaranteeVariableInterestEntities, us-gaap:FairValueInputsLevel3, us-gaap:MeasurementInputLossSeverity, us-gaap:IncomeApproachValuationTechnique


Assumption
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
Value045.0044.550.050.4-0.2000.600
Percentage of AssumptionForFairValueOnSecuritizationDateOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPrepaymentSpeed0.00.00.068.20.00.00.00.00.00.00.00.0

srt:Minimum, ago:FinancialGuaranteeVariableInterestEntities, us-gaap:FairValueInputsLevel3, us-gaap:MeasurementInputPrepaymentRate, us-gaap:IncomeApproachValuationTechnique


Assumption
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
Value00.900.8960.0030.001-0.006-0.00200.0090-0.004
Percentage of AssumptionForFairValueOnSecuritizationDateOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPrepaymentSpeed0.00.00.01.40.00.00.00.00.00.00.00.0

srt:Minimum, us-gaap:ResidentialMortgageBackedSecurities, us-gaap:FairValueInputsLevel3, us-gaap:MeasurementInputDefaultRate, us-gaap:IncomeApproachValuationTechnique


Assumption
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
Value01.501.48500.0150000.01500
Percentage of AssumptionForFairValueOnSecuritizationDateOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPrepaymentSpeed0.00.00.02.30.00.00.00.00.00.00.00.0

srt:Minimum, us-gaap:ResidentialMortgageBackedSecurities, us-gaap:FairValueInputsLevel3, us-gaap:MeasurementInputLossSeverity, us-gaap:IncomeApproachValuationTechnique


Assumption
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
Value050.0044.550.050.40000.400
Percentage of AssumptionForFairValueOnSecuritizationDateOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPrepaymentSpeed0.00.00.068.20.00.00.00.00.00.00.00.0

srt:Minimum, us-gaap:ResidentialMortgageBackedSecurities, us-gaap:FairValueInputsLevel3, us-gaap:MeasurementInputPrepaymentRate, us-gaap:IncomeApproachValuationTechnique


Assumption
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
Value00-0.71.073-0.0060.0330.006-0.001-0.0120.0270.0060.007
Percentage of AssumptionForFairValueOnSecuritizationDateOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPrepaymentSpeed0.00.00.01.60.00.00.00.00.00.00.00.0

srt:WeightedAverage, ago:FinancialGuaranteeVariableInterestEntities, us-gaap:FairValueInputsLevel3, us-gaap:MeasurementInputDefaultRate, us-gaap:IncomeApproachValuationTechnique


Assumption
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
Value1.96.10.15.8470.0040.0490.0020.001-0.0030.049-0.005-0.001
Percentage of AssumptionForFairValueOnSecuritizationDateOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPrepaymentSpeed0.00.00.08.90.00.00.00.00.00.00.00.0

srt:WeightedAverage, ago:FinancialGuaranteeVariableInterestEntities, us-gaap:FairValueInputsLevel3, us-gaap:MeasurementInputLossSeverity, us-gaap:IncomeApproachValuationTechnique


Assumption
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
Value-0.181.61.679.1030.0540.743-0.015-0.008-0.0130.79700
Percentage of AssumptionForFairValueOnSecuritizationDateOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPrepaymentSpeed0.00.00.0121.10.00.00.00.00.00.00.00.0

srt:WeightedAverage, ago:FinancialGuaranteeVariableInterestEntities, us-gaap:FairValueInputsLevel3, us-gaap:MeasurementInputPrepaymentRate, us-gaap:IncomeApproachValuationTechnique


Assumption
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
Value0.810.30.78.6140.0020.084-0.002-0.001-0.0020.0910-0.001
Percentage of AssumptionForFairValueOnSecuritizationDateOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPrepaymentSpeed0.00.00.013.20.00.00.00.00.00.00.00.0

srt:WeightedAverage, us-gaap:ResidentialMortgageBackedSecurities, us-gaap:FairValueInputsLevel3, us-gaap:MeasurementInputDefaultRate, us-gaap:IncomeApproachValuationTechnique


Assumption
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
Value0.95.6-0.16.0460.0050.04900-0.0020.051-0.0020
Percentage of AssumptionForFairValueOnSecuritizationDateOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPrepaymentSpeed0.00.00.09.30.00.00.00.00.00.00.00.0

srt:WeightedAverage, us-gaap:ResidentialMortgageBackedSecurities, us-gaap:FairValueInputsLevel3, us-gaap:MeasurementInputLossSeverity, us-gaap:IncomeApproachValuationTechnique


Assumption
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
Value0.683.80.182.6660.0440.79-0.0690.0020.0010.8540.005-0.001
Percentage of AssumptionForFairValueOnSecuritizationDateOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPrepaymentSpeed0.00.00.0126.50.00.00.00.00.00.00.00.0

srt:WeightedAverage, us-gaap:ResidentialMortgageBackedSecurities, us-gaap:FairValueInputsLevel3, us-gaap:MeasurementInputPrepaymentRate, us-gaap:IncomeApproachValuationTechnique


Assumption
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
Value1.37.40.26.8350.0010.0640.0030.001-0.0020.061-0.001-0.001
Percentage of AssumptionForFairValueOnSecuritizationDateOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPrepaymentSpeed0.00.00.010.50.00.00.00.00.00.00.00.0

us-gaap:AssumptionForFairValueOnSecuritizationDateOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPrepaymentSpeed us-gaap:Range, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByLiabilityClass, us-gaap:MeasurementInputType, us-gaap:ValuationTechnique

srt:Maximum, us-gaap:FairValueInputsLevel3, ago:FinancialGuaranteeVariableInterestEntities, us-gaap:MeasurementInputDefaultRate, us-gaap:IncomeApproachValuationTechnique


Assumption
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
Value-1.228.11.025.3350.0160.249-0.010.0150.0020.240.0020.003
Percentage of AssumptionForFairValueOnSecuritizationDateOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPrepaymentSpeed0.00.00.038.80.00.00.00.00.00.00.00.0

srt:Maximum, us-gaap:FairValueInputsLevel3, ago:FinancialGuaranteeVariableInterestEntities, us-gaap:MeasurementInputLossSeverity, us-gaap:IncomeApproachValuationTechnique


Assumption
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31