ARGO


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:Restatement

us-gaap:EarningsPerShareDiluted
us-gaap:Restatement
us-gaap:AwardType
us-gaap:AllocatedShareBasedCompensationExpense

us-gaap:BenefitsLossesAndExpenses
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:Restatement

us-gaap:ComprehensiveIncomeNetOfTax
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
us-gaap:DisposalGroupNotDiscontinuedOperationGainLossOnDisposal

us-gaap:GainLossOnInvestments
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:Restatement

us-gaap:GeneralAndAdministrativeExpense

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:Restatement
us-gaap:StatementGeographical

us-gaap:IncomeTaxExpenseBenefit
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:Restatement

us-gaap:IncomeTaxesPaid

us-gaap:IncomeTaxesPaidNet

us-gaap:InterestExpense
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:Restatement

us-gaap:InterestPaidNet
us-gaap:LongtermDebtType

us-gaap:NetIncomeLoss
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems
us-gaap:Restatement
us-gaap:StatementEquityComponents

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems
us-gaap:Restatement

us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted

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

us-gaap:OtherComprehensiveIncomeLossNetOfTax

us-gaap:PreferredStockDividendsIncomeStatementImpact
us-gaap:ConsolidatedEntities

us-gaap:PremiumsEarnedNet
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:StatementGeographical

us-gaap:RealizedInvestmentGainsLosses
us-gaap:Restatement

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

us-gaap:Revenues
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:Restatement

us-gaap:Assets
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:Restatement

us-gaap:Liabilities
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems
us-gaap:Restatement

us-gaap:LiabilitiesAndStockholdersEquity
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems
us-gaap:Restatement

us-gaap:StockholdersEquity
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems
us-gaap:Restatement
us-gaap:StatementEquityComponents

us-gaap:Cash
dei:LegalEntity
us-gaap:ConsolidatedEntities

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities
us-gaap:ShortTermInvestments

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:PropertyPlantAndEquipmentNet
us-gaap:ConsolidatedEntities
us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
us-gaap:ConsolidationItems

us-gaap:Goodwill
us-gaap:StatementBusinessSegments

us-gaap:IntangibleAssetsNetExcludingGoodwill
us-gaap:StatementBusinessSegments

us-gaap:IntangibleAssetsNetIncludingGoodwill
dei:LegalEntity
us-gaap:ConsolidatedEntities

us-gaap:DeferredTaxAssetsLiabilitiesNet
us-gaap:IncomeTaxAuthority

us-gaap:OperatingLeaseRightOfUseAsset
dei:LegalEntity
us-gaap:ConsolidatedEntities

us-gaap:EquitySecuritiesFvNi

us-gaap:OtherAssets
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:Restatement

us-gaap:AccruedIncomeTaxesCurrent

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

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:OperatingLeaseLiability
dei:LegalEntity
us-gaap:ConsolidatedEntities

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:StockholdersEquity
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems
us-gaap:Restatement
us-gaap:StatementEquityComponents

us-gaap:CommonStockValue

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:RetainedEarningsAccumulatedDeficit
us-gaap:Restatement

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:TreasuryStockValue

us-gaap:StockIssuedDuringPeriodValueNewIssues
us-gaap:StatementEquityComponents

us-gaap:NetCashProvidedByUsedInOperatingActivities
dei:LegalEntity
us-gaap:ConsolidatedEntities

us-gaap:NetCashProvidedByUsedInInvestingActivities
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems

us-gaap:NetCashProvidedByUsedInFinancingActivities
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect
dei:LegalEntity
us-gaap:ConsolidatedEntities

us-gaap:DeferredIncomeTaxExpenseBenefit

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet

us-gaap:NetCashProvidedByUsedInOperatingActivities
dei:LegalEntity
us-gaap:ConsolidatedEntities

us-gaap:NetIncomeLoss
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems
us-gaap:Restatement
us-gaap:StatementEquityComponents

us-gaap:ShareBasedCompensation

us-gaap:NetCashProvidedByUsedInInvestingActivities
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:PaymentsToAcquireInvestments
dei:LegalEntity
us-gaap:ConsolidatedEntities

us-gaap:NetCashProvidedByUsedInFinancingActivities
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems

us-gaap:PaymentsOfDividends
us-gaap:StatementClassOfStock

us-gaap:PaymentsOfDividendsCommonStock
us-gaap:ConsolidatedEntities

us-gaap:EffectiveIncomeTaxRateContinuingOperations
us-gaap:StatementGeographical
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
us-gaap:IncomeTaxAuthority
us-gaap:DeferredTaxLiabilities

us-gaap:UnrecognizedTaxBenefits

us-gaap:DeferredTaxAssetsValuationAllowance

argo:DebtSecuritiesAvailableForSaleAllowanceForCreditLossAdditionalPeriodIncreaseDecrease
us-gaap:InvestmentType

argo:DepositarySharesDividendsPerShareDeclared
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
argo:DisposalGroupNotDiscontinuedOperationGainLossOnDisposalAdjustmentInCurrentPeriod
us-gaap:ConsolidatedEntities
argo:EquityInUndistributedNetIncomeLossOfSubsidiaries
us-gaap:ConsolidationItems

argo:FeeAndOtherExpense
dei:LegalEntity
us-gaap:ConsolidatedEntities

argo:FeeAndOtherIncome
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:DerivativeInstrumentRisk
argo:ForeignCurrencyTransactionLossRealized
us-gaap:DerivativeInstrumentRisk, us-gaap:InvestmentType

argo:GainsLossesInInvestmentUnrealizedAppreciationDepreciationAfterTax

argo:GainsLossesInInvestmentUnrealizedAppreciationDepreciationBeforeTax
us-gaap:InvestmentType

argo:GrossRealizedInvestmentOnFixedMaturitiesAndOtherGains
us-gaap:InvestmentType

argo:GrossRealizedInvestmentOnFixedMaturitiesAndOtherLosses
us-gaap:InvestmentType

argo:IncomeTaxExpenseBenefitRelatedToNetRealizedInvestmentAndOtherGains

argo:IncomeTaxExpenseBenefitRelatedToUnrealizedAppreciationDepreciationNetTaxEffects

argo:IncomeTaxReconciliationForeignExchangeAdjustments

argo:IncomeTaxReconciliationWithholdingTaxes

argo:IncreaseDecreaseInAccruedUnderwritingExpenses

argo:IncreaseDecreaseInReinsurancePayablesAndFundsHeld

argo:IncreaseDecreaseInSettlementsOfForeignCurrencyExchangeForwardContracts
dei:LegalEntity
us-gaap:ConsolidatedEntities

argo:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseChangeInParticipationInterest

argo:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNetReserveCededInReinsuranceToCloseTransaction

argo:NetIncomeLossBeforeEquityInEarningsOfSubsidiaries
dei:LegalEntity
us-gaap:ConsolidatedEntities

argo:NetLossesAndAdjustmentExpensesRelatedToPandemic

argo:NetRealizedInvestmentGainsLossesNetOfIncomeTaxes

argo:NetSupplementaryInsuranceInformationAmortizationDeferralOfDeferredPolicyAcquisitionCosts

argo:OtherComprehensiveIncomeLossNetofTaxIncludingCumulativeEffectofAdoption
us-gaap:StatementEquityComponents

argo:OtherCorporateExpenseCivilPenalties

argo:OtherUnderwritingAcquisitionAndInsuranceExpenses

argo:PaymentsForProceedsFromChangeInForeignRegulatoryDepositsAndVoluntaryPools

argo:PaymentsForProceedsFromChangeInForeignRegulatoryDepositsVoluntaryPoolsShorttermInvestments
dei:LegalEntity
us-gaap:ConsolidatedEntities

argo:PaymentsForProceedsFromPurchasesOfFixedAssetAndOtherInvestingActivities
dei:LegalEntity
us-gaap:ConsolidatedEntities

argo:PaymentsToAcquireEquitySecuritiesFVNI

argo:PremiumReceivableAllowanceForCreditLossForeignExchangeAdjustments

argo:PremiumTaxesBoardsAndBureaus

argo:ProceedsFromSaleOfDepositaryShares

argo:ProceedsFromSaleOfInvestments
dei:LegalEntity
us-gaap:ConsolidatedEntities

argo:ProceedsfromSaleAndMaturityOfEquitySecuritiesFVNI

argo:UnderwritingAcquisitionAndInsuranceExpenseGross

argo:UnderwritingAcquisitionAndInsuranceExpenses
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:Restatement

argo:UndistributedEarningsFromAlternativeInvestmentPortfolio

us-gaap:DebtAndEquitySecuritiesGainLossExcludingOtherThanTemporaryImpairmentLoss

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded
us-gaap:InvestmentType

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossPeriodIncreaseDecrease
us-gaap:IncomeStatementLocation
us-gaap:InvestmentType

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold
us-gaap:InvestmentType

us-gaap:DepreciationAndAmortization
dei:LegalEntity
us-gaap:DividendsCash

us-gaap:DividendsCommonStockCash
us-gaap:StatementEquityComponents

us-gaap:DividendsPreferredStockCash
us-gaap:StatementEquityComponents

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
dei:LegalEntity

us-gaap:EquitySecuritiesFvNiGainLoss

us-gaap:EquitySecuritiesFvNiRealizedGainLoss

us-gaap:EquitySecuritiesFvNiUnrealizedGainLoss
us-gaap:Restatement

us-gaap:ExtinguishmentOfDebtAmount

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
us-gaap:InvestmentType

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
us-gaap:InvestmentType

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
us-gaap:InvestmentType

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
us-gaap:InvestmentType

us-gaap:ForeignCurrencyTransactionGainLossBeforeTax
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:Restatement
us-gaap:DerivativeInstrumentRisk
us-gaap:ForeignCurrencyTransactionGainLossRealized
us-gaap:DerivativeInstrumentRisk, us-gaap:InvestmentType
us-gaap:DerivativeInstrumentRisk
us-gaap:GainLossOnDerivativeInstrumentsNetPretax

us-gaap:GainLossOnDispositionOfAssets1
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
us-gaap:GoodwillWrittenOffRelatedToSaleOfBusinessUnit
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
us-gaap:ImpairmentOfIntangibleAssetsExcludingGoodwill

us-gaap:IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance

us-gaap:IncomeTaxReconciliationChangeInEnactedTaxRate

us-gaap:IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate

us-gaap:IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses

us-gaap:IncomeTaxReconciliationOtherAdjustments

us-gaap:IncomeTaxReconciliationPriorYearIncomeTaxes

us-gaap:IncomeTaxReconciliationTaxContingencies

us-gaap:IncomeTaxReconciliationTaxExemptIncome

us-gaap:IncreaseDecreaseInAccruedIncomeTaxesPayable

us-gaap:IncreaseDecreaseInAccruedInterestReceivableNet

us-gaap:IncreaseDecreaseInDeferredPolicyAcquisitionCosts

us-gaap:IncreaseDecreaseInFuturePolicyBenefitReserves

us-gaap:IncreaseDecreaseInPremiumsReceivable

us-gaap:IncreaseDecreaseInPrepaidReinsurancePremiums

us-gaap:IncreaseDecreaseInUnearnedPremiums

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseForeignCurrencyTranslationGainLoss

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1
dei:LegalEntity
us-gaap:ConsolidatedEntities

us-gaap:NoninterestExpenseCommissionExpense

us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossBeforeTax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax

us-gaap:OtherComprehensiveIncomeLossTax

us-gaap:OtherComprehensiveIncomeOtherNetOfTax
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax

us-gaap:OtherNonoperatingExpense
us-gaap:ConsolidatedEntities

us-gaap:PaymentsForLossesAndLossAdjustmentExpense

us-gaap:PaymentsForProceedsFromOtherInvestingActivities

us-gaap:PaymentsForProceedsFromShortTermInvestments

us-gaap:PaymentsOfDividendsPreferredStockAndPreferenceStock
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities
us-gaap:PaymentsToAcquireAdditionalInterestInSubsidiaries
us-gaap:ConsolidationItems

us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesDebt

us-gaap:PaymentsToAcquireOtherInvestments
us-gaap:StatementClassOfStock, us-gaap:SubsequentEventType
us-gaap:PreferredStockDividendRatePercentage
us-gaap:StatementClassOfStock
us-gaap:PreferredStockDividendsPerShareDeclared

us-gaap:PremiumReceivableCreditLossExpenseReversal

us-gaap:PremiumsReceivableAllowanceForDoubtfulAccountsWriteOffsAgainstAllowance
dei:LegalEntity
us-gaap:ProceedsFromContributedCapital
us-gaap:ConsolidationItems

us-gaap:ProceedsFromIncomeTaxRefunds

us-gaap:ProceedsFromIssuanceOfPreferredStockAndPreferenceStock
us-gaap:ConsolidatedEntities

us-gaap:ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans
us-gaap:ConsolidatedEntities

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities
dei:LegalEntity
us-gaap:ConsolidatedEntities

us-gaap:ProceedsFromSaleOfAvailableForSaleSecuritiesDebt

us-gaap:ProceedsFromSaleOfOtherInvestments
us-gaap:StatementEquityComponents
us-gaap:ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent

us-gaap:ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent
us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents
us-gaap:ReclassificationFromAociCurrentPeriodTax

us-gaap:ReinsuranceRecoverableCreditLossExpenseReversal
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice

us-gaap:StockIssuedDuringPeriodValueEmployeeStockPurchasePlan
us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation
us-gaap:StatementEquityComponents

us-gaap:StockRepurchasedAndRetiredDuringPeriodValue
us-gaap:StatementEquityComponents

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense
us-gaap:StatementBusinessSegments

us-gaap:UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities

us-gaap:UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpense

us-gaap:UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense

us-gaap:UnrecognizedTaxBenefitsPeriodIncreaseDecrease

argo:AccruedUnderwritingExpensesAndOtherLiabilities
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:Restatement

argo:AssetsAssociatedWithTradeCapitalProviders

argo:CollateralUnderReinsuranceAgreements
us-gaap:CreditFacility, us-gaap:DebtInstrument

argo:CreditRiskRatingPercentRatedAOrBetter

argo:DeferredTaxAssetsChangeInFederalTaxRate

argo:DeferredTaxAssetsForeignUnderwritingResults

argo:DeferredTaxAssetsLiabilitiesGross

argo:DeferredTaxAssetsRightofUseAssets

argo:DeferredTaxLiabilitiesAcquisitionCost

argo:DeferredTaxLiabilitiesTaxCutsAndJobsActOf2017ReserveTransitionalLiability

argo:DeferredTaxLiabilityUnrealizedGainsLossesOnFixedMaturitiesAndOtherInvestmentSecurities

argo:DeferredTaxLiabilityUnrealizedGainsLossesOnLimitedPartnershipSecurities

argo:FairValueOfInvestmentsAssetsManagedOnBehalfOfTradeCapitalProviders

argo:FundsHeldAndCededReinsurancePayableNet
dei:LegalEntity
us-gaap:ConsolidatedEntities

argo:GrossReserveForDiscontinuationOfCertainLinesOfBusiness
us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
dei:LegalEntity, us-gaap:CounterpartyName, us-gaap:ProductOrService
argo:ReinsuranceToCloseTransactionNetTechnicalProvision

argo:SecuritiesAndLettersOfCreditPledged

argo:ShortTermInvestmentsAmortizedCost
us-gaap:CounterpartyName, us-gaap:RelatedPartyTransactionsByRelatedParty
argo:SuretyBondsOutstanding

us-gaap:AccruedInvestmentIncomeReceivable
dei:LegalEntity
us-gaap:ConsolidatedEntities

us-gaap:AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax

us-gaap:AssetsOfDisposalGroupIncludingDiscontinuedOperation
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:DisposalGroupClassification
us-gaap:StatementGeographical, us-gaap:DisposalGroupClassification
us-gaap:AssumedLiabilityForUnpaidClaimsAndClaimsAdjustmentExpense
us-gaap:StatementGeographical, us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
us-gaap:InvestmentType
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
us-gaap:InvestmentType

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:InvestmentType

us-gaap:AvailableForSaleSecuritiesDebtSecurities
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:InvestmentType

us-gaap:ContractualObligation
us-gaap:Range

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:FinancialInstrument, us-gaap:InvestmentType
us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger
us-gaap:InvestmentType
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
us-gaap:InvestmentType
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months
us-gaap:InvestmentType
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
us-gaap:InvestmentType

us-gaap:DebtSecuritiesAvailableForSaleExcludingAccruedInterest
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:InvestmentType
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition
us-gaap:InvestmentType
us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss
us-gaap:InvestmentType

us-gaap:DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible

us-gaap:DeferredIncomeTaxAssetsNet
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:Restatement

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredPolicyAcquisitionCosts
dei:LegalEntity
us-gaap:ConsolidatedEntities

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsInvestments

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBonuses

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsUnearnedPremiumsReserve

us-gaap:DeferredTaxLiabilitiesLeasingArrangements

us-gaap:DeferredTaxLiabilitiesOther

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment

us-gaap:DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities
us-gaap:RetirementPlanTaxStatus, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanFundedStatusOfPlan
us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeAssetsLiabilitiesAtFairValueNet
us-gaap:DerivativeInstrumentRisk, us-gaap:InvestmentType
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
us-gaap:DisposalGroupIncludingDiscontinuedOperationConsideration
dei:LegalEntity
us-gaap:DueFromAffiliates
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities
us-gaap:DueToAffiliateCurrentAndNoncurrent
us-gaap:AwardType
us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized

us-gaap:EquitySecuritiesFvNiCost
us-gaap:InvestmentType
us-gaap:FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
us-gaap:InvestmentType

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsGross
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:HeldToMaturitySecurities

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateNetCarryingAmount

us-gaap:HeldToMaturitySecuritiesFairValue

us-gaap:IncomeTaxReceivable
dei:LegalEntity
us-gaap:ConsolidatedEntities

us-gaap:IncomeTaxesReceivable
us-gaap:Restatement

us-gaap:Investments

us-gaap:JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust
us-gaap:ConsolidatedEntities, us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:LiabilityForAsbestosAndEnvironmentalClaimsGross
us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
us-gaap:DisposalGroupClassification
us-gaap:LiabilityForAsbestosAndEnvironmentalClaimsNet

us-gaap:LiabilityForClaimsAndClaimsAdjustmentExpense
dei:LegalEntity
us-gaap:ConsolidatedEntities

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet

us-gaap:LiabilityReportingCurrencyDenominatedValue
us-gaap:CreditFacility
us-gaap:LineOfCredit
us-gaap:CreditFacility, us-gaap:DebtInstrument
us-gaap:DebtInstrument, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:LongtermDebtType
us-gaap:LongTermDebtFairValue
us-gaap:DebtInstrument, us-gaap:FairValueByMeasurementBasis, us-gaap:LongtermDebtType
us-gaap:DebtInstrument, us-gaap:FairValueByMeasurementFrequency, us-gaap:LongtermDebtType
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:LongtermDebtType
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis, us-gaap:LongtermDebtType
us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementFrequency, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType
us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
us-gaap:LongtermDebtType
us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
us-gaap:LongtermDebtType
us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
us-gaap:LongtermDebtType
us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
us-gaap:LongtermDebtType
us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
us-gaap:LongtermDebtType
us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo

us-gaap:LongTermNotesPayable
us-gaap:DebtInstrument

us-gaap:LossContingencyDiscountedAmountOfInsuranceRelatedAssessmentLiability

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent
us-gaap:StatementGeographical, us-gaap:TaxCreditCarryforward
us-gaap:OperatingLossCarryforwards

us-gaap:OtherInvestments

us-gaap:OtherInvestmentsAndSecuritiesAtCost

us-gaap:OtherLongTermDebt
us-gaap:LongtermDebtType

us-gaap:OtherShortTermInvestments

us-gaap:PledgedAssetsSeparatelyReportedSecuritiesPledgedAsCollateralAtFairValue

us-gaap:PledgedAssetsSeparatelyReportedSecuritiesPledgedUnderLetterOfCreditFacilitiesAtFairValue

us-gaap:PolicyholderContractDeposits

us-gaap:PremiumsReceivableAllowanceForDoubtfulAccounts

us-gaap:PremiumsReceivableAtCarryingValue
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:Restatement

us-gaap:PrepaidReinsurancePremiums
dei:LegalEntity
us-gaap:ConsolidatedEntities

us-gaap:ReinsurancePayable
us-gaap:Restatement

us-gaap:ReinsuranceReceivablesIncurredButNotReportedClaims

us-gaap:ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments, us-gaap:Subsegments
us-gaap:StatementBusinessSegments

us-gaap:ReinsuranceRecoverables

us-gaap:ReinsuranceRecoverablesAllowance

us-gaap:ReinsuranceRecoverablesOnPaidAndUnpaidLosses
dei:LegalEntity
us-gaap:ConsolidatedEntities

us-gaap:ReinsuranceRecoverablesOnPaidLosses
dei:LegalEntity
us-gaap:RelatedPartyTransactionDueFromToRelatedParty
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems

us-gaap:SeniorNotes
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue

us-gaap:ShortDurationContractsDiscountedLiabilitiesAmount
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments, us-gaap:Subsegments
us-gaap:StatementBusinessSegments
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments, us-gaap:Subsegments
us-gaap:ShortDurationContractsDiscountedLiabilitiesDiscountRate
us-gaap:StatementBusinessSegments

us-gaap:ShortdurationInsuranceContractsDiscountedLiabilitiesAggregateDiscount
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments, us-gaap:Subsegments
us-gaap:StatementBusinessSegments
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments, us-gaap:Subsegments
us-gaap:ShortdurationInsuranceContractsHistoricalClaimsDurationYearEight
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments, us-gaap:Subsegments
us-gaap:ShortdurationInsuranceContractsHistoricalClaimsDurationYearFive
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments, us-gaap:Subsegments
us-gaap:ShortdurationInsuranceContractsHistoricalClaimsDurationYearFour
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments, us-gaap:Subsegments
us-gaap:ShortdurationInsuranceContractsHistoricalClaimsDurationYearNine
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments, us-gaap:Subsegments
us-gaap:ShortdurationInsuranceContractsHistoricalClaimsDurationYearOne
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments, us-gaap:Subsegments
us-gaap:ShortdurationInsuranceContractsHistoricalClaimsDurationYearSeven
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments, us-gaap:Subsegments
us-gaap:ShortdurationInsuranceContractsHistoricalClaimsDurationYearSix
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments, us-gaap:Subsegments
us-gaap:ShortdurationInsuranceContractsHistoricalClaimsDurationYearTen
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments, us-gaap:Subsegments
us-gaap:ShortdurationInsuranceContractsHistoricalClaimsDurationYearThree
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments, us-gaap:Subsegments
us-gaap:ShortdurationInsuranceContractsHistoricalClaimsDurationYearTwo

us-gaap:ShortdurationInsuranceContractsLiabilityForUnpaidClaimsAndAllocatedClaimAdjustmentExpenseNet
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments, us-gaap:Subsegments
us-gaap:StatementBusinessSegments
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments, us-gaap:Subsegments
us-gaap:ShortdurationInsuranceContractsLiabilityForUnpaidClaimsAndAllocatedClaimAdjustmentExpenseNetNotSeparatelyPresented

us-gaap:ShortdurationInsuranceContractsLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseAccumulatedUnallocatedClaimAdjustmentExpense
us-gaap:Range
us-gaap:StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance
us-gaap:StatementGeographical

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersDiscountDeductedFromReserves

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersReservesForUnpaidClaimsAndClaimsAdjustmentExpense

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersUnearnedPremiums

us-gaap:SupplementaryInsuranceInformationDeferredPolicyAcquisitionCosts
us-gaap:StatementBusinessSegments

us-gaap:SupplementaryInsuranceInformationLiabilityForFuturePolicyBenefitsLossesClaimsAndLossExpenseReserves
us-gaap:StatementBusinessSegments

us-gaap:SupplementaryInsuranceInformationOtherPolicyClaimsAndBenefitsPayable
us-gaap:StatementBusinessSegments

us-gaap:SupplementaryInsuranceInformationUnearnedPremiums
us-gaap:StatementBusinessSegments

us-gaap:TreasuryStockShares

us-gaap:UnamortizedDebtIssuanceExpense

us-gaap:UnearnedPremiums
dei:LegalEntity
us-gaap:ConsolidatedEntities

us-gaap:UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued
us-gaap:LongtermDebtType
us-gaap:UnsecuredDebt

us-gaap:ValuationAllowancesAndReservesBalance

Plots across concepts


IncomeStatement
Other Comprehensive Income Loss Net Of Tax
Expenses
Interest Expense
Balance Sheet
Intangible Assets Net Excluding Goodwill
Assets
Operating Lease Right Of Use Asset
Current Assets
Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents
NonCurrent Assets
Deferred Income Tax Assets Net
PropertyPlantAndEquipmentNet
Property Plant And Equipment Net
Liabilities
Operating Lease Liability
Noncurrent Liabilities
Long Term Debt
Stockholders Equity
Accumulated Other Comprehensive Income Loss Net Of Tax
CashFlow
Net Cash Provided By Used In Operating Activities
NetCashProvidedByUsedInOperatingActivities
Net Cash Provided By Used In Operating Activities
NetCashProvidedByUsedInInvestingActivities
Proceeds From Sale Of Productive Assets
Shares
Treasury Stock Shares
LesseeOperatingLeaseLiabilityPaymentsDue
Lessee Operating Lease Liability Payments Due Year Four

Tables

  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:CommonStockValue ████████████▇▇▅▅▅▅▅▅▅▄▄▄▄▄▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁46.246.146.046.046.045.945.745.645.645.445.345.245.144.940.440.340.340.240.040.039.937.237.137.137.036.934.334.334.234.234.134.034.031.531.431.431.331.331.331.331.331.231.2NANANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding █▁35.0127834.938013NA34.66726634.63435334.469516NA34.29999934.77999134.737939NA34.65632834.66891834.740343NA29.97848531.04808130.941409NA30.72838330.81015628.304571NA28.47450428.47074128.677379NA26.43693326.61326426.966461NA27.8195528.0095925.596237NA25.75688326.07114726.482309NA27.23778827.68553727.550053NA29.8763530.27853230.858657
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic █▁34.82064934.71265NA34.66726634.63435334.469516NA34.29999934.1952533.984329NA33.95669533.93850933.868749NA29.97848530.20145730.047083NA30.01863730.18759227.710955NA27.91658627.94897828.129692NA25.95659926.14650726.514481NA26.68217626.96239724.768904NA25.22719425.68481826.17741NA27.23778827.3404527.550053NA29.504929.87817330.625822
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 0.036219NANANANA0.294869NA0.4893760.0050840.0NA0.00.00.0NA0.8186320.00.0NA0.00.00.0NA0.00.0004840.00176NA0.0018790.0026110.0033NA0.0587840.0226040.214453NA0.9721751.3142431.200366NA1.5061641.259351.587189NA0.8940680.956323NA
us-gaap:EarningsPerShareBasic ▇▆▅▄▅▄▁▄▆█▃▆▆▆▆▃▇▆▆▇▆▆▇▆▆▇█▇▇▇▇▆▆▆▅▆▆▆▅▄▆▁▅▆▆▆1.930.78-0.06000000000000005-0.91-0.18-0.55-3.01-0.730.842.68-1.291.21.230.730.98-2.041.521.221.11.841.031.01.481.271.02.092.321.721.481.521.81.161.181.32-0.190.530.930.750.05-0.440.83-3.430.450.780.870.68
us-gaap:EarningsPerShareDiluted ▇▆▅▄▅▄▁▄▆█▃▆▆▆▆▃▇▆▆▇▆▆▇▆▆▇█▇▇▇▇▆▆▆▅▆▆▆▅▄▆▁▅▆▆▆1.920.78-0.06000000000000005-0.91-0.18-0.55-3.01-0.730.832.63-1.291.171.20.710.95-2.041.481.191.071.81.00.981.441.240.982.052.281.691.451.491.741.121.131.28-0.190.520.920.740.05-0.440.82-3.430.440.770.860.67
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
 EBT Margin dei:LegalEntity argo:OtherSubsidiariesAndEliminationsNANA181.4156.4115.4150.3188.3195.0185.4172.7236.9237.4162.3273.7274.2259.6278.5262.9NANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 EBT Margin us-gaap:ConsolidatedEntities srt:ParentCompanyNANA-9.6NA1.4-0.151.8-1.2-0.7-0.838.5-0.9-0.2NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 EBT Margin us-gaap:ConsolidatedEntities srt:SubsidiaryIssuerNANA345.1327.1340.2286.3296.5293.6303.9337.3166.4262.4301.2NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 EBT Margin us-gaap:Restatement srt:RestatementAdjustmentNANANANA-1.8NA0.1NANA0.2NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 EBT Margin us-gaap:Restatement srt:ScenarioPreviouslyReportedNANANA483.5457.0436.5484.5487.4488.6509.2NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
 us-gaap:AllocatedShareBasedCompensationExpense us-gaap:AwardType us-gaap:PerformanceShares█▁0.90.7NANA0.60.1NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:AllocatedShareBasedCompensationExpense us-gaap:AwardType us-gaap:RestrictedStockUnitsRSU▁█1.41.5NA1.72.13.0NA3.23.5NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:BenefitsLossesAndExpenses ▅▆▆▆▅▅█▆▅▄▅▅▄▄▅▆▄▃▃▂▂▂▂▂▂▁▂▂▂▂▂▂▂▁▂▂▁▁▁▁▁▃▁▁▂▂469.0492.4518.0512.9451.3458.1586.8513.6459.0409.1462.3453.6406.2412.0443.5505.1400.2385.4358.4354.5344.7337.0325.0335.8338.4309.0331.7324.6330.5317.4334.1331.1321.2304.1354.8326.8293.0295.0313.4309.6303.5394.8298.2301.9330.3338.8
us-gaap:ComprehensiveIncomeNetOfTax ▇▄▅▄▇▁▂▄▆█▃▅▅▄▅▃▆▆▅▆▆▆▅▄▅▅▅▅▆▅▅▆▃▆▄▆▄▆▅▃▅▂▄▆▅▅88.8-24.622.41.4101.4-129.2-105.2-29.365.3141.7-63.636.420.1-7.228.5-44.464.550.69.457.359.756.529.2-18.318.936.831.36.864.141.343.847.2-35.245.7-19.360.06.255.127.1-63.232.5-86.6-13.182.926.426.6
 us-gaap:DisposalGroupNotDiscontinuedOperationGainLossOnDisposal us-gaap:DisposalGroupClassification,us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations us-gaap:DisposalGroupDisposedOfBySaleNotDiscontinuedOperations,argo:TridentPublicRiskSolutions5.0NA0.0-3.725290298461914e-1532.3NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:GainLossOnInvestments ▆▅▅▃▅▁▆▃▅█24.713.114.5-5.720.1-36.121.8-6.212.052.5NANANANANANANANANANANANANANANANA-136.512.918.511.141.79.130.0-9.57.18.3-2.813.117.9-2.531.52.37.89.15.014.5
us-gaap:GeneralAndAdministrativeExpense NANA106.792.193.398.998.192.999.089.190.183.290.687.892.789.788.088.774.875.671.170.676.369.679.772.976.169.074.168.872.065.466.768.765.860.261.560.557.051.050.251.954.958.149.2NA
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest ▇▆▅▄▅▄▁▄▆█▃▆▇▅▅▂▆▆▆▇▆▆▆▆▆▇▇▆▆▆▆▆▆▆▅▆▆▅▅▄▅▂▅▆▅78.731.2-1.1-29.45.7-21.6-103.3-26.229.6100.1-59.745.357.125.012.3-65.950.842.747.062.239.633.144.236.234.762.480.348.340.038.542.339.634.532.44.828.329.025.7-0.1-5.89.0-84.123.633.721.7NA
us-gaap:IncomeTaxExpenseBenefit ▆▄▄▄▆▄▄▄▄▆▁▅▇▄▁▃▅▅▇▅▆▅▅▄▅▅█▅▅▅█▄▆▅▄▅▄▆▅▅▆▄▅▆▅▇8.91.4-1.80.212.1-2.80.5-1.10.88.9-16.14.715.30.2-16.6-4.64.86.014.17.08.75.43.00.96.83.620.63.66.12.518.71.911.14.80.64.31.08.56.96.09.7-3.15.58.46.012.8
us-gaap:IncomeTaxesPaid ▂▁▁█▁▁▄▂▁▁▂▃▂▁▂▁▃▁8.00.91.744.41.30.319.23.51.10.26.79.96.71.56.40.29.90.0NANANANANANANANANANANANANANANANANA5.05.08.1NA5.20.110.0NA10.4NANA
us-gaap:IncomeTaxesPaidNet ▂▁▁█▁▁▄▂▁▁▂▃▂▁▂▁▃▁▃▁▁▁▁▁▃▁▁▂▁▄▁▂▂▁▁▂▃▂8.00.81.543.50.60.319.23.41.10.26.79.96.71.56.40.29.90.015.10.21.00.30.10.310.00.5-0.18.20.015.60.19.15.02.52.95.013.18.1NANANANANANANANA
us-gaap:InterestExpense ▃▂▂▄▄▆▇▅█▇▆▆▆▆▅▅▅▃▂▁▁▁▁▁▁▁▁▁▂▂▂▂▂▁▄▃▂▃▂▂▂▂▂▃▂▃5.75.15.66.86.87.78.47.59.38.58.27.97.87.77.37.57.05.95.04.94.94.84.74.84.64.94.94.95.15.05.15.15.14.96.75.85.55.75.65.65.55.45.65.85.56.0
us-gaap:InterestPaidNet ▁▂▁▃▄▅▃█▅▇5.25.65.46.26.97.96.69.78.08.8NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:NetIncomeLoss ▇▆▅▄▄▄▁▄▆█▃▆▆▆▆▃▆▆▆▇▆▆▆▆▆▇▇▆▆▆▆▆▆▆▅▅▆▅▅▄▆▁▅▆▆▅69.829.80.7-29.6-6.4-18.8-103.3-25.128.891.2-43.640.641.824.828.9-61.346.036.732.955.230.927.741.235.327.958.859.744.738.640.247.831.031.732.7-4.713.424.019.61.4-12.122.8-94.512.823.026.120.7
us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic █▆▅▄▅▄▁▄67.127.2-1.9-31.6-5.4-24.7-109.0-25.1NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted 67.1NANANA-5.4NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:NetInvestmentIncome █▇▅▇▁▆▅▆▇▅▅▆▅▆▆▅▇▅▄▅▆▄▄▄▄▄▄▄▄▄▄▄▄▅▅▅▅▅▅▅▅▅▅▅▅▅52.744.433.742.01.535.534.240.242.833.929.434.533.236.035.030.943.630.525.532.735.721.221.721.321.820.821.920.820.623.322.724.125.327.928.528.930.031.429.530.032.933.433.133.633.133.8
us-gaap:OtherComprehensiveIncomeLossNetOfTax ▅▃▅▆█▁▄▄▆▆▄▄▄▄▅▅▅▅▄▅▅▅▄▃▄▄▄▃▅▅▄▅▂▅▄▆▄▆▅▃▅19.0-54.421.731.0107.8-110.4-1.9-4.236.550.5-20.0-4.2-21.7-32.0-0.416.918.513.9-23.52.128.828.8-12.0-53.6-9.0-22.0-28.4-37.925.51.1-4.016.2-66.913.0-14.646.6-17.835.525.7-51.19.7NANANANANA
us-gaap:PreferredStockDividendsIncomeStatementImpact █▇▇▁2.72.62.62.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:PremiumsEarnedNet ███▇▇▇▇▇▇▆▇▇▆▆▆▅▆▅▄▄▄▄▄▄▄▃▄▄▄▃▄▃▃▂▃▂▂▂▂▁▁▁▁▂▃▃470.3466.1466.6445.5433.4435.0425.8451.5431.7420.5452.4446.9417.7414.7404.5389.3399.1379.4362.3358.7344.9344.9345.3346.0346.0334.6338.7337.6336.1325.7341.6330.5327.5304.2314.7304.3290.2277.3281.1268.2271.3261.4274.7288.9324.5323.5
us-gaap:RealizedInvestmentGainsLosses ▅▅▄▅▅▆█▅▆█▁▆▅▄▆▅▅▆4.0-1.3-10.899999999999997-5.711.127.962.5-6.212.052.5-81.014.210.5-15.714.26.04.514.6NANANANANANA5.316.051.512.918.511.141.79.111.09.57.08.3-2.713.111.53.931.52.38.29.15.014.5
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax █▇▇▆▅▅▆▆▆▇▄▇▆▅▅▅▅▅▄▄▃▃▃▃▃▃▄▃▃▃▄▃▃▂▂▂▂▂▂▁▂▁▂▂▃▃547.7523.6516.9483.5457.0436.5484.6487.4488.6509.2402.6498.9463.3437.0455.8439.2451.0428.1405.4416.7384.3370.1369.1372.0373.1371.4412.1371.3375.2360.1400.6364.0364.0341.6350.7344.5318.0323.1318.6303.5336.0297.2316.5333.3362.4372.3
us-gaap:Revenues ████▇▇████▁█▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▆▆▆▆▇▆▆▇▇▇547.7523.6516.9483.5457.0436.5484.6487.4488.6509.2-498.9498.9463.3437.0455.8439.2451.0428.1405.4416.7384.3370.1369.1372.0373.1371.4412.1371.3375.2360.1400.6364.0364.0341.6350.7344.5318.0323.1318.6303.5336.0297.2316.5333.3362.4372.3
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:Assets ▇▇██▇▇██▇▇▆▆▅▅▅▅▄▄▂▂▂▂▁▁▁▁▁▁▁▁▁▂▁▁▂▂▁▁▁▁▁▁▁10368.310348.910465.810734.310396.710201.310514.510445.810166.79954.59558.29279.79105.79141.38764.09058.08240.78019.57205.07181.16960.86819.76630.16627.56544.06377.16356.36388.66421.26431.46591.06650.66575.36602.56688.96649.86347.06339.66401.96502.76513.76335.66481.9NANANA
us-gaap:Liabilities ▇▇███▇█▇▇▇▆▆▅▅▅▅▄▃▂▂▂▂▁▁▁▁▁▁▁▁▂▂▂▂▂▂▁▁▁▂▁▁▁8470.48527.98608.08869.88666.78564.58733.48552.48237.78073.97811.57461.67308.67353.96944.37250.06349.46184.95412.35392.75220.55114.34962.04986.04875.14714.34709.64761.74788.14836.55028.05123.25084.25055.95174.85107.94853.64833.54922.95036.44965.14815.24855.8NANANA
us-gaap:LiabilitiesAndStockholdersEquity ▇▇██▇▇██▇▇▆▆▅▅▅▅▄▄▂▂▂▂▁▁▁▁▁▁▁▁▁▂▁▁▂▂▁▁▁▁▁▁▁10368.310348.910465.810734.310396.710201.310514.510445.810166.79954.59558.29279.79105.79141.38764.09058.08240.78019.57205.07181.16960.86819.76630.16627.56544.06377.16356.36388.66421.26431.46591.06650.66575.36602.56688.96649.86347.06339.66401.96502.76513.76335.66481.9NANANA
us-gaap:StockholdersEquity █▆▇▇▅▄▆▇█▇▅▆▆▆▆▆▇▇▆▆▅▅▄▄▄▄▄▃▄▃▂▂▁▂▂▂▁▂▁▁▂▂▃1897.91821.01857.81864.51730.01636.81781.11893.41929.01880.61746.71818.11797.11787.41819.71808.01891.31834.61792.71788.41740.31705.41668.11641.51668.91662.81646.71626.91633.11594.91563.01527.41491.11546.61514.11541.91493.41506.11479.01466.31548.61520.41626.1NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:Cash ▅▄▄█▅▄▄▄▅▄▄▃▃▅▅▆▆▅▂▃▃▃▃▃▃▂▂▂▄▄▄▄▃▂▃▄▂▂▃▃▁▃▂▂▂▁190.7156.7148.8300.4187.7158.7137.8145.1182.3152.7139.2118.5126.7173.7176.6235.8214.5190.786.0123.6120.6122.9121.796.2106.589.181.073.1136.2149.5157.4141.6102.091.295.8142.775.889.9100.9119.849.0105.483.566.269.839.5
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents ▄▂▂█▄▃▂▂▃▂▂▁▁190.7156.7148.8300.4187.7158.7137.8145.1182.3152.7139.2118.5126.7NA176.6NANANA86.0NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:ShortTermInvestments us-gaap:ConsolidatedEntities srt:ParentCompanyNANA0.6NANANA0.6NANANA3.8NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment NANA163.3NANANA153.2NANANA146.0NANANA124.1NANANA101.6NANANA85.1NANANA81.7NANANA65.5NANANA53.1NANANA46.6NANANA38.8NANANA
us-gaap:PropertyPlantAndEquipmentNet NANA130.4NANANA140.4NANANA154.8NANANA151.0NANANA142.2NANANA133.1NANANA102.7NANANA79.0NANANA68.7NANANA49.6NANANA44.7NANANA
 us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures us-gaap:ConsolidatedEntities srt:ParentCompanyNANA1881.91932.21904.21796.71916.72053.62076.9NA1852.7NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures us-gaap:ConsolidationItems srt:ConsolidationEliminationsNANA-1881.9-1932.2-1904.2-1796.7-1916.7-2053.6-2076.9NA-1852.7NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:Goodwill ▁▁▁▃▃▄▄████▄▄▄▄▂▂▂▂▂▂▂▂▂▂▂▂▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃147.3147.3147.3156.5156.5161.4161.4177.0177.0177.0177.0161.4161.4161.4161.4152.2152.2152.2152.2152.2152.2152.2152.2152.2152.2152.2152.2153.8153.8153.8153.8153.8153.8153.8153.8153.8153.8153.8153.8153.8153.8153.8153.8NANANA
us-gaap:IntangibleAssetsNetExcludingGoodwill ▁▁▁▅▅▅▅▅▅▅▅██▇▆██▇▂▂▂▃▃▃▃▃▃▄▄▄▄▅▅▅▅▅▅▅▅▅▅▆▆60.560.560.590.891.191.591.892.292.693.193.5110.5111.9107.396.8108.3108.9107.167.768.970.571.973.374.476.578.878.681.783.484.786.087.388.790.091.588.490.791.993.092.393.394.395.3NANANA
us-gaap:IntangibleAssetsNetIncludingGoodwill NANA207.8247.3247.6252.9253.2269.2269.6270.1270.5271.9273.3268.7258.2260.5261.1259.3219.9221.1222.7224.1225.5226.6228.7231.0230.8235.5NANA239.8NANANANANANANANANANANANANANANA
 us-gaap:IntangibleAssetsNetIncludingGoodwill dei:LegalEntity argo:OtherSubsidiariesAndEliminationsNANA89.389.289.289.289.2104.8104.8104.8104.8105.7106.1101.190.1NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:IntangibleAssetsNetIncludingGoodwill us-gaap:ConsolidatedEntities srt:ParentCompanyNANANA39.639.940.340.640.941.2NA41.9NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:IntangibleAssetsNetIncludingGoodwill us-gaap:ConsolidatedEntities srt:SubsidiaryIssuerNANA118.5118.5118.5123.4123.4123.5123.6NA123.8NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:DeferredTaxAssetsLiabilitiesNet NANA16.7NANANA6.1NANANANANANANANANANANANANANANANANANANA-53.0NANANA-28.7NANANA-43.8NANANA-26.1NANANA-10.5NANANA
 us-gaap:DeferredTaxAssetsLiabilitiesNet us-gaap:IncomeTaxAuthority us-gaap:ForeignCountryNANA21.4NANANA6.1NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OperatingLeaseRightOfUseAsset ▁▇▂▂▃▃▃▇▇█78.8107.982.084.487.289.191.8108.6112.6115.3NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:EquitySecuritiesFvNi ▂▂▂▂▂▁▁███▆185.7182.3176.7150.7147.5132.9124.4400.6421.0414.8354.5NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:AccruedIncomeTaxesCurrent 5.3NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:LongTermDebt NANA458.7456.9578.7577.5578.7578.6579.4579.9580.2580.6581.1582.7580.7580.8578.4576.1367.6369.4369.2368.5371.7373.9373.2374.0378.5380.9403.4403.6403.4402.0401.1401.5400.9519.8NANA377.0NANANANANANANA
 us-gaap:LongTermDebt dei:LegalEntity argo:OtherSubsidiariesAndEliminationsNANA145.8144.1140.9139.8141.0141.0141.2141.7142.1142.5143.0144.7142.8NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LongTermDebt us-gaap:ConsolidatedEntities srt:ParentCompanyNANA28.428.4153.4153.4153.4153.4153.4NA153.4NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LongTermDebt us-gaap:ConsolidatedEntities srt:SubsidiaryIssuerNANA284.5284.4284.4284.3284.3284.2284.8NA284.7NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LongTermDebt us-gaap:LongtermDebtType argo:FloatingRateLoanStockNANA94.4NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LongTermDebt us-gaap:LongtermDebtType argo:SeniorUnsecuredNotesNANA347.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LongTermDebt us-gaap:LongtermDebtType us-gaap:JuniorSubordinatedDebtNANA411.0NANANANANANANANANANANANANANANANANANANANANA172.7172.7172.7172.7193.3193.3193.3NANANA193.3NANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo NANA13.2NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree NANA11.1NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour NANA9.8NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive NANA9.6NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive NANA58.4NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:StockholdersEquity █▆▇▇▅▄▆▇█▇▅▆▆▆▆▆▇▇▆▆▅▅▄▄▄▄▄▃▄▃▂▂▁▂▂▂▁▂▁▁▂▂▃1897.91821.01857.81864.51730.01636.81781.11893.41929.01880.61746.71818.11797.11787.41819.71808.01891.31834.61792.71788.41740.31705.41668.11641.51668.91662.81646.71626.91633.11594.91563.01527.41491.11546.61514.11541.91493.41506.11479.01466.31548.61520.41626.1NANANA
us-gaap:CommonStockValue ████████████▇▇▅▅▅▅▅▅▅▄▄▄▄▄▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁46.246.146.046.046.045.945.745.645.645.445.345.245.144.940.440.340.340.240.040.039.937.237.137.137.036.934.334.334.234.234.134.034.031.531.431.431.331.331.331.331.331.231.2NANANA
us-gaap:AdditionalPaidInCapitalCommonStock ██████████████▅▅▅▅▅▅▅▄▄▄▄▄▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁1383.11381.31380.21378.51376.51374.21376.61373.21369.71374.91372.01368.71365.31364.71129.11129.11125.91122.71123.31119.81117.1970.8964.9961.8960.6960.9836.3834.4832.3829.5827.3825.3823.6725.5722.7721.2719.5718.0716.8715.6714.4713.0711.4NANANA
us-gaap:RetainedEarningsAccumulatedDeficit ▂▁▁▂▂▃▄▆▇▆▅▆▅▄▇▇█▇▇▆▅█▇▆▆▅▇▆▅▄▃▃▂▃▃▃▃▂▂▂▃▂▄756.5700.5684.1714.2756.7773.7811.1925.0959.9943.0862.6915.7884.4851.8977.0956.41026.0988.3959.9933.8885.31007.2985.7950.2920.5898.4969.4914.4874.2840.4804.4760.5733.5804.9776.0783.7773.4752.4752.0753.7769.1749.6847.5NANANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▄▃▅▄▃▁▃▃▄▃▂▂▂▃▆▆▅▅▄▅▅▄▄▄▅▅▆▆▇▇▇▇▆███▇▇▇▆▇▇▇23.24.258.636.95.9-101.92.84.78.9-27.6-78.1-58.1-53.9-32.096.697.080.161.647.771.269.140.311.523.577.186.1108.1136.5174.4148.9147.8151.8135.6202.5189.5204.1157.5175.3139.8114.1165.2155.5147.6NANANA
us-gaap:TreasuryStockValue ██████████████▇▇▆▆▆▆▆▆▅▅▅▅▅▅▄▄▄▄▄▃▃▃▃▂▂▂▁▁▁455.1455.1455.1455.1455.1455.1455.1455.1455.1455.1455.1453.4443.8442.0423.4414.8381.0378.2378.2376.4371.1350.1331.1331.1326.3319.5301.4292.7282.0258.1250.6244.2235.6217.8205.5198.5188.3170.9160.9148.4131.4128.9111.6NANANA
us-gaap:StockIssuedDuringPeriodValueNewIssues NANA0.0144.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:StockIssuedDuringPeriodValueNewIssues us-gaap:StatementEquityComponents us-gaap:PreferredStockNANA0.0144.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities ▁▅▂█▁▂▃█▂▄▅▆▂▇▁-82.770.2-29.5204.5-71.7-31.4-12.4200.6-60.555.670.3105.1-27.7153.6-87.4NANANANANA-19.751.246.8141.267.027.658.895.2-67.143.62.893.2-12.2-84.0-33.091.9-22.4-6.0-82.863.17.6-5.6-32.675.8-5.7-40.6
 us-gaap:NetCashProvidedByUsedInOperatingActivities dei:LegalEntity argo:OtherSubsidiariesAndEliminationsNANA-74.3144.7-25.3-77.1-21.360.6-36.017.324.5-15.9NANA-70.6NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInOperatingActivities us-gaap:ConsolidatedEntities srt:ParentCompanyNANA-30.615.310.310.09.29.910.58.814.718.5NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInOperatingActivities us-gaap:ConsolidatedEntities srt:SubsidiaryIssuerNANA75.444.5-56.735.7-0.3130.1-35.029.531.1102.5NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:NetCashProvidedByUsedInInvestingActivities █▅▃▄█▇▆▁▇▅▅▄▅▃▆129.1-50.0-105.0-95.1114.561.316.4-229.5102.0-31.7-35.0-95.5-9.3-128.544.7NANANANANA45.8-25.5-17.6-144.1-34.02.1-34.6-126.284.5-45.021.6-40.745.294.7109.5-151.631.37.179.130.7-58.148.689.6-32.031.095.3
us-gaap:NetCashProvidedByUsedInFinancingActivities ▄▄▄█▅▅▅▅▄▅▄▃▅▁▃-13.3-13.1-13.06.5-9.9-10.4-10.1-9.9-11.3-10.5-10.6-19.1-10.2-27.7-16.4NANANANANA-28.1-24.7-5.3-7.3-15.6-21.8-13.4-31.4-30.8-6.8-9.2-13.1-21.9-15.3-125.8125.8-21.4-12.4-16.5-18.0-6.0-21.1-39.7-47.45.0-33.3
 us-gaap:NetCashProvidedByUsedInFinancingActivities dei:LegalEntity argo:OtherSubsidiariesAndEliminationsNANA-13.120.30.00.00.00.00.019.10.0-19.0NANA-60.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInFinancingActivities us-gaap:ConsolidatedEntities srt:ParentCompanyNANA-13.0131.5-9.9-10.4-10.1-9.3-11.3-10.5-10.6-19.1NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInFinancingActivities us-gaap:ConsolidationItems srt:ConsolidationEliminationsNANA13.100000000000016-145.30.00.00.00.00.00.00.00.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect ▆▅▁█▆▆▅▄▆▅▆▅34.07.9-151.6112.729.020.9-7.3-37.229.613.520.7-8.2NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:DeferredIncomeTaxExpenseBenefit ▄▅▅▄▅▂▁▄▅▆▄▅▄▄▃▅▃▆▄▄▅▆▄▇▅▆▆█▅▅▅▅▅▅▅▅▅▆▅▆▆▅▅▄▅▅-7.10.31.6-4.81.4-19.8-24.3-5.4-2.15.3-5.2-0.5-3.2-3.7-11.5-1.7-10.76.0-3.4-3.82.23.9-5.512.2-2.23.84.718.63.21.1-0.6-1.63.03.02.4-1.4-0.94.90.13.49.0-2.8-1.6-4.5-1.10.9
us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet ▅▆▄▃▆▆▇▄▆▇▃▇▂▁▄▄▆▆▆▅▇▅▅▅▅▅▅▅▃▆▅▅▇▃▅▅▅▅▅▄▅▆▅▅▃█-2.60000000000000219.0-14.7-29.619.814.737.4-22.025.838.7-28.146.8-60.3-71.6-15.9-16.513.319.714.0-0.634.41.3-0.7-3.210.1-6.8-3.80.0-38.614.4-2.76.247.2-28.94.66.6-1.91.40.6-9.7-0.228.0-4.6-3.7-31.557.0
us-gaap:NetCashProvidedByUsedInOperatingActivities ▁▅▂█▁▂▃█▂▄▅▆▂▇▁-82.770.2-29.5204.5-71.7-31.4-12.4200.6-60.555.670.3105.1-27.7153.6-87.4NANANANANA-19.751.246.8141.267.027.658.895.2-67.143.62.893.2-12.2-84.0-33.091.9-22.4-6.0-82.863.17.6-5.6-32.675.8-5.7-40.6
 us-gaap:NetCashProvidedByUsedInOperatingActivities dei:LegalEntity argo:OtherSubsidiariesAndEliminationsNANA-74.3144.7-25.3-77.1-21.360.6-36.017.324.5-15.9NANA-70.6NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInOperatingActivities us-gaap:ConsolidatedEntities srt:ParentCompanyNANA-30.615.310.310.09.29.910.58.814.718.5NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInOperatingActivities us-gaap:ConsolidatedEntities srt:SubsidiaryIssuerNANA75.444.5-56.735.7-0.3130.1-35.029.531.1102.5NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:NetIncomeLoss ▇▆▅▄▄▄▁▄▆█▃▆▆▆▆▃▆▆▆▇▆▆▆▆▆▇▇▆▆▆▆▆▆▆▅▅▆▅▅▄▆▁▅▆▆▅69.829.80.7-29.6-6.4-18.8-103.3-25.128.891.2-43.640.641.824.828.9-61.346.036.732.955.230.927.741.235.327.958.859.744.738.640.247.831.031.732.7-4.713.424.019.61.4-12.122.8-94.512.823.026.120.7
us-gaap:ShareBasedCompensation ▂▂▁▂▃▃▅▃▄▄▄▃▅▅▁▄▃▅█▅▃▃█▅▇▅▆▂▆▄▅▃▆█▃▄▂▃▂▁▁▁▃▃▂▃2.22.31.02.32.52.95.22.94.24.63.93.45.85.21.13.62.74.98.75.52.63.08.35.57.75.26.32.26.84.45.53.26.08.62.63.91.42.62.11.10.80.63.42.41.92.4
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInInvestingActivities █▅▃▄█▇▆▁▇▅▅▄▅▃▆129.1-50.0-105.0-95.1114.561.316.4-229.5102.0-31.7-35.0-95.5-9.3-128.544.7NANANANANA45.8-25.5-17.6-144.1-34.02.1-34.6-126.284.5-45.021.6-40.745.294.7109.5-151.631.37.179.130.7-58.148.689.6-32.031.095.3
us-gaap:PaymentsToAcquirePropertyPlantAndEquipment ▃▄▃▄▃▂▄▄▄▄▁█▃▃▄▄▃▃▃▃▆▄▁▄▁▆▅▄▅▃▄▃▄▃▄▄▄▄▃▃▃▂▃▃▃▃5.67.74.48.25.32.37.07.28.47.3-3.624.84.66.410.210.45.14.95.44.015.96.8-3.17.6-3.417.812.37.812.96.07.06.18.84.27.27.710.09.25.85.04.01.72.84.63.33.9
us-gaap:PaymentsToAcquireInvestments NANA400.4574.7328.2849.2344.5680.4574.9384.2171.9603.1686.6687.5600.6594.2821.6644.4524.8600.0797.1458.6565.6451.2460.1557.2472.0498.6458.9307.3568.5481.0483.5442.8370.1384.8358.2508.4468.4NANANANANANANA
 us-gaap:PaymentsToAcquireInvestments dei:LegalEntity argo:OtherSubsidiariesAndEliminationsNANA70.6215.5-23.8266.2131.9275.6137.5135.210.4193.8224.3212.3245.8264.4457.1197.9NANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PaymentsToAcquireInvestments us-gaap:ConsolidatedEntities srt:SubsidiaryIssuerNANA329.8359.2352.0583.0212.6404.8437.4249.0161.5409.3NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInFinancingActivities ▄▄▄█▅▅▅▅▄▅▄▃▅▁▃-13.3-13.1-13.06.5-9.9-10.4-10.1-9.9-11.3-10.5-10.6-19.1-10.2-27.7-16.4NANANANANA-28.1-24.7-5.3-7.3-15.6-21.8-13.4-31.4-30.8-6.8-9.2-13.1-21.9-15.3-125.8125.8-21.4-12.4-16.5-18.0-6.0-21.1-39.7-47.45.0-33.3
 us-gaap:NetCashProvidedByUsedInFinancingActivities dei:LegalEntity argo:OtherSubsidiariesAndEliminationsNANA-13.120.30.00.00.00.00.019.10.0-19.0NANA-60.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInFinancingActivities us-gaap:ConsolidatedEntities srt:ParentCompanyNANA-13.0131.5-9.9-10.4-10.1-9.3-11.3-10.5-10.6-19.1NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInFinancingActivities us-gaap:ConsolidationItems srt:ConsolidationEliminationsNANA13.100000000000016-145.30.00.00.00.00.00.00.00.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:PaymentsOfDividends NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PaymentsOfDividends us-gaap:StatementClassOfStock us-gaap:SeriesAPreferredStockNANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:PaymentsOfDividendsCommonStock ▇▇▇▇▇▇▇▆█▇▆▆▆▆▅▅▅▅▄▄▄▄▃▃▃▃▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▂11.110.810.79999999999999710.90000000000000410.610.710.69.811.910.89.59.39.49.38.38.38.38.36.86.76.96.25.65.95.55.74.84.74.74.04.04.04.13.73.03.13.13.13.13.33.33.43.43.53.63.7
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31

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
Value4646464646454545454545454544404040404040393737373736343434343434343131313131313131313131
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 Assets0.40.40.40.40.40.40.40.40.40.50.50.50.50.50.50.40.50.50.60.60.60.50.60.60.60.60.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.4

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value3534343434343434343434293130303028282828262626272825252626272727293030
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value3434343434343433333333293030303027272728252626262624252526272727292930
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount


Antidilutive
Period End2021-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value36219.0294870.0489380.05084.00000818630.0000000484.01760.01879.02611.03300.058784.022604.0214450.0972180.01314200.01200400.01506200.01259400.01587200.0894070.0956320.0
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount100.0100.0100.0100.00.00.00.00.0100.00.00.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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
Value1.930.78-0.06-0.91-0.18-0.55-3.01-0.730.842.68-1.291.21.230.730.98-2.041.521.221.11.841.031.01.481.271.02.092.321.721.481.521.81.161.181.32-0.190.530.930.750.05-0.440.83-3.430.450.780.870.68
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

us-gaap:EarningsPerShareBasic us-gaap:Restatement

srt:RestatementAdjustment


Earnings
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.190.02-0.170.02-0.03-0.05-100000.0
Percentage of EarningsPerShareBasic-20.9-11.130.9-0.74.1-6.0-3731343.3

srt:ScenarioPreviouslyReported


Earnings
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-0.91-0.18-0.55-3.01-0.730.842680000.0
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100000000.0

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
Value1.920.78-0.06-0.91-0.18-0.55-3.01-0.730.832.63-1.291.171.20.710.95-2.041.481.191.071.81.00.981.441.240.982.052.281.691.451.491.741.121.131.28-0.190.520.920.740.05-0.440.82-3.430.440.770.860.67
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

us-gaap:EarningsPerShareDiluted us-gaap:Restatement

srt:RestatementAdjustment


Earnings
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.190.02-0.170.02-0.03-0.05-110000.0
Percentage of EarningsPerShareDiluted-20.9-11.130.9-0.74.1-6.0-4182509.5

srt:ScenarioPreviouslyReported


Earnings
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-0.91-0.18-0.55-3.01-0.730.832630000.0
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100000000.0

Allocated Share Based Compensation Expense

us-gaap:AllocatedShareBasedCompensationExpense us-gaap:AwardType

us-gaap:AllocatedShareBasedCompensationExpense

us-gaap:PerformanceShares


Allocated
Period End2021-06-302021-03-312020-06-302020-03-31
Value0.90.70.60.1
Percentage of AllocatedShareBasedCompensationExpense100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.20.10.10.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:PerformanceShares0.00.00.00.0

us-gaap:RestrictedStockUnitsRSU


Allocated
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value1.41.51.72.13.03.23.5
Percentage of AllocatedShareBasedCompensationExpense155.6214.30.0350.03000.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.30.30.40.50.70.70.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RestrictedStockUnitsRSU0.00.00.00.00.00.00.0

Benefits Losses And Expenses

us-gaap:BenefitsLossesAndExpenses

us-gaap:BenefitsLossesAndExpenses


Benefits
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value469492518512451458586513459409462453406412443505400385358354344337325335338309331324330317334331321304354326293295313309303394298301330338
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 RevenueFromContractWithCustomerExcludingAssessedTax85.694.00.0106.198.8104.9121.1105.493.980.30.090.987.794.397.3115.088.790.088.485.189.791.188.190.390.783.280.587.488.188.183.491.088.289.0101.294.992.191.398.4102.090.3132.894.290.691.191.0

us-gaap:BenefitsLossesAndExpenses dei:LegalEntity

argo:OtherSubsidiariesAndEliminations


Benefits
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value207187170151258223167138194221183237273316257234
Percentage of BenefitsLossesAndExpenses40.036.637.833.044.043.636.533.942.048.745.157.661.662.764.260.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.038.837.334.753.345.934.327.30.044.339.554.359.972.157.054.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax argo:OtherSubsidiariesAndEliminations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:BenefitsLossesAndExpenses us-gaap:ConsolidatedEntities

srt:ParentCompany


Benefits
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value6.25.56.99.8183.79.92.41.54.97.4
Percentage of BenefitsLossesAndExpenses1.21.11.52.13.20.72.20.60.31.11.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.01.11.52.23.90.82.00.50.01.01.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:ParentCompany0.00.00.00.00.00.00.00.00.00.00.0

srt:SubsidiaryIssuer


Benefits
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value304319273297310286281267266227215
Percentage of BenefitsLossesAndExpenses58.862.460.764.852.955.761.365.557.750.253.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.066.159.968.064.158.757.652.60.045.646.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:SubsidiaryIssuer0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:BenefitsLossesAndExpenses us-gaap:Restatement

srt:RestatementAdjustment


Benefits
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-2.9-2.04.1-1.00.91.8-1.2
Percentage of BenefitsLossesAndExpenses-0.6-0.40.9-0.20.20.4-0.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.6-0.40.9-0.20.20.4-0.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:RestatementAdjustment0.00.00.00.00.00.00.0

srt:ScenarioPreviouslyReported


Benefits
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value512451458587513459409
Percentage of BenefitsLossesAndExpenses100.0100.0100.0100.2100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax106.198.8104.9121.3105.493.980.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:ScenarioPreviouslyReported0.00.00.00.00.00.00.0

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value88-24.6221.4101-129.2-105.2-29.365141-63.63620-7.228-44.464509.457595629-18.31836316.864414347-35.245-19.3606.25527-63.232-86.6-13.1822626
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax16.2-4.70.00.322.2-29.6-21.7-6.013.427.80.07.34.3-1.66.3-10.114.311.82.313.815.515.37.9-4.95.19.97.61.817.111.510.913.0-9.713.4-5.517.41.917.18.5-20.89.7-29.1-4.124.97.37.1

Disposal Group Not Discontinued Operation Gain Loss On Disposal

us-gaap:DisposalGroupNotDiscontinuedOperationGainLossOnDisposal us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

us-gaap:DisposalGroupNotDiscontinuedOperationGainLossOnDisposal

us-gaap:DisposalGroupDisposedOfBySaleNotDiscontinuedOperations, argo:TridentPublicRiskSolutions


Disposal
Period End2021-06-302020-12-312020-09-302020-06-30
Value5.00.0-3.725290298461914e-1532
Percentage of DisposalGroupNotDiscontinuedOperationGainLossOnDisposal100.00.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.90.0-0.07.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:DisposalGroupDisposedOfBySaleNotDiscontinuedOperations argo:TridentPublicRiskSolutions0.00.00.00.0

Gain Loss On Investments

us-gaap:GainLossOnInvestments

us-gaap:GainLossOnInvestments


Gain
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value241314-5.720-36.121-6.21252-136.5121811419.130-9.57.18.3-2.81317-2.5312.37.89.15.014
Percentage of GainLossOnInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.52.50.0-1.24.4-8.34.5-1.32.510.3-33.13.54.93.110.42.58.2-2.82.02.4-0.94.15.6-0.89.40.82.52.71.43.9

us-gaap:GainLossOnInvestments dei:LegalEntity

argo:OtherSubsidiariesAndEliminations


Gain
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value7.6-1.2-14.44.61.0-5.6-2.96.7
Percentage of GainLossOnInvestments52.421.1-71.6-12.74.690.3-24.212.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.0-0.2-3.21.10.2-1.1-0.61.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax argo:OtherSubsidiariesAndEliminations0.00.00.00.00.00.00.00.0

us-gaap:GainLossOnInvestments us-gaap:ConsolidatedEntities

srt:ParentCompany


Gain
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-9.60.01.4-0.10.4-0.3-0.1-0.1
Percentage of GainLossOnInvestments-66.2-0.07.00.31.84.8-0.8-0.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.00.3-0.00.1-0.1-0.0-0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:ParentCompany0.00.00.00.00.00.00.00.0

srt:SubsidiaryIssuer


Gain
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value16-4.533-40.620-0.31545
Percentage of GainLossOnInvestments113.878.9164.7112.593.14.8125.087.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.0-0.97.2-9.34.2-0.13.19.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:SubsidiaryIssuer0.00.00.00.00.00.00.00.0

us-gaap:GainLossOnInvestments us-gaap:Restatement

srt:RestatementAdjustment


Gain
Period End2020-09-302020-06-302020-03-312019-12-31
Value0.0-1.7-0.10.1
Percentage of GainLossOnInvestments-0.0-8.50.30.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.0-0.4-0.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:RestatementAdjustment0.00.00.00.0

srt:ScenarioPreviouslyReported


Gain
Period End2020-09-302020-06-302020-03-312019-12-31
Value-5.720-36.121
Percentage of GainLossOnInvestments100.0100.0100.099.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-1.24.4-8.34.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:ScenarioPreviouslyReported0.00.00.00.0

General And Administrative Expense

us-gaap:GeneralAndAdministrativeExpense

us-gaap:GeneralAndAdministrativeExpense


General
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
Value106929398989299899083908792898888747571707669797276697468726566686560616057515051545849
Percentage of GeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.019.020.422.720.219.120.317.50.016.719.620.120.320.419.520.718.518.118.519.120.718.721.419.618.518.619.719.118.018.018.320.118.817.519.318.717.916.814.917.517.317.413.6

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

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value7831-1.1-29.45.7-21.6-103.3-26.229100-59.745572512-65.95042476239334436346280484038423934324.8282925-0.1-5.89.0-84.1233321
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax14.46.00.0-6.11.2-4.9-21.3-5.46.119.70.09.112.35.72.7-15.011.310.011.614.910.38.912.09.79.316.819.513.010.710.710.610.99.59.51.48.29.18.0-0.0-1.92.7-28.37.510.16.0

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest dei:LegalEntity

argo:OtherSubsidiariesAndEliminations


Income
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-25.8-31.2-55.1-1.0-70.1-28.917334216-20.9361.1-57.02128
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest2345.5106.1-966.74.667.9110.360.133.9-71.936.2-36.6145.68.986.542.366.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.0-6.5-12.1-0.2-14.5-5.93.66.70.03.3-4.58.30.2-13.04.86.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax argo:OtherSubsidiariesAndEliminations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest us-gaap:ConsolidatedEntities

srt:ParentCompany


Income
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-15.8-5.5-5.5-9.933-4.9-10.6-3.237-5.8-7.6
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest1436.418.7-96.545.8-32.018.7-35.8-3.2-62.0-12.8-13.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.0-1.1-1.2-2.36.8-1.0-2.2-0.60.0-1.2-1.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:ParentCompany0.00.00.00.00.00.00.00.00.00.00.0

srt:SubsidiaryIssuer


Income
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value407.366-10.7-14.27.62269-100.43485
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest-3681.8-24.81163.249.513.7-29.075.769.3168.276.6149.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.01.514.5-2.5-2.91.64.613.60.07.018.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:SubsidiaryIssuer0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-14.6-6.0-9.6-6.9-7.9-10.3-14.0-7.9-11.3-12.1-10.6-10.4-8.8-15.5-24.3-10.4-14.6-14.9-12.4-11.5-15.8-15.3
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest-18.6-19.2872.723.5-138.647.713.630.2-38.2-12.117.8-23.0-15.4-62.0-197.615.8-28.7-34.9-26.4-18.5-39.9-46.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2.7-1.10.0-1.4-1.7-2.4-2.9-1.6-2.3-2.40.0-2.1-1.9-3.5-5.3-2.4-3.2-3.5-3.1-2.8-4.1-4.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CorporateNonSegment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-30
Value7325-6.0-4.82.425-88.5-10.031593141555622-61.560434656575145424649384040
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest92.881.4545.516.342.1-116.285.738.2105.159.6-53.491.697.0224.8182.193.3119.9100.798.190.0145.2154.7102.3116.6134.379.847.983.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax13.34.90.0-1.00.55.8-18.3-2.16.411.70.08.312.012.94.9-14.013.510.011.413.415.013.812.211.312.513.49.310.810.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, argo:InternationalOperations


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value19-11.8-27.6-14.7-27.5-12.3-79.3-52.9-21.016-2.0-1.21322-26.6-77.59.18.3
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest24.8-37.82509.150.0-482.556.976.8201.9-70.916.23.4-2.623.191.6-216.3117.617.919.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.6-2.30.0-3.0-6.0-2.8-16.4-10.9-4.33.20.0-0.22.85.2-5.8-17.62.01.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments argo:InternationalOperations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, argo:RunOffLines


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-0.10.6-1.9-10.2-1.30.5-10.00.7-1.10.6-0.7-7.6-0.3-0.7-1.5-12.7-1.2-2.5
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest-0.11.9172.734.7-22.8-2.39.7-2.7-3.70.61.2-16.8-0.5-2.8-12.219.3-2.4-5.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.00.10.0-2.1-0.30.1-2.10.1-0.20.10.0-1.5-0.1-0.2-0.3-2.9-0.3-0.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments argo:RunOffLines0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, argo:USOperations


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value5336232031360.84253423450423450285337
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest68.1117.3-2136.4-68.4547.4-170.8-0.8-161.1179.742.9-58.0111.074.4136.0410.6-43.6104.387.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.87.00.04.26.88.50.28.710.98.40.010.19.27.811.16.511.88.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments argo:USOperations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest us-gaap:Restatement

srt:RestatementAdjustment


Income
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value2.90.2-4.11.1-0.9-1.81.4
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest-9.93.519.0-1.13.4-6.11.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.60.0-0.90.2-0.2-0.40.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:RestatementAdjustment0.00.00.00.00.00.00.0

srt:ScenarioPreviouslyReported


Income
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-29.45.7-21.6-103.3-26.229100
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-6.11.2-4.9-21.3-5.46.119.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:ScenarioPreviouslyReported0.00.00.00.00.00.00.0

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest us-gaap:StatementGeographical

country:AE


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-30
Value0.10.30.30.40.50.90.10.00.00.20.30.20.20.20.23.5-2.20.00.00.00.00.00.00.10.10.10.00.0-0.1
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest0.11.0-27.3-1.48.8-4.2-0.1-0.00.00.2-0.50.40.40.81.6-5.3-4.30.00.00.00.00.00.00.30.30.20.00.0-0.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.10.00.10.10.20.00.00.00.00.00.00.00.00.00.8-0.50.00.00.00.00.00.00.00.00.00.00.0-0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax country:AE0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

country:BE


Income
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-30
Value0.00.20.10.00.4-0.1-0.30.00.00.0-0.10.1-0.10.10.10.0-0.10.00.00.00.10.00.1-0.20.1-0.10.0
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest-0.0-0.71.8-0.0-0.40.4-1.00.0-0.00.0-0.20.4-0.8-0.20.20.0-0.20.00.00.00.20.00.3-0.30.1-0.20.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.00.00.00.1-0.0-0.10.00.00.0-0.00.0-0.00.00.00.0-0.00.00.00.00.00.00.0-0.10.0-0.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax country:BE0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

country:BM


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-30
Value2.35.0-5.92.4-31.1-21.7-73.9-7.81532276.4-33.62521-43.025261935222225241825282725
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest2.916.0536.4-8.2-545.6100.571.529.850.732.0-46.614.1-58.8101.2174.865.349.862.142.357.255.866.557.768.052.741.235.556.962.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.41.00.00.5-6.8-5.0-15.2-1.63.16.30.01.3-7.35.84.7-9.85.66.24.98.55.85.96.96.64.96.96.97.46.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax country:BM0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

country:BR


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-30
Value2.31.60.70.30.62.20.21.22.01.80.50.40.1-1.41.00.00.6-0.8-0.50.40.8-0.10.5-0.7-1.2-1.9-6.1-1.25.1
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest2.95.1-63.6-1.010.5-10.2-0.2-4.66.81.8-0.80.90.2-5.68.1-0.01.2-1.9-1.10.62.0-0.31.1-1.9-3.5-3.0-7.6-2.512.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.40.30.00.10.10.50.00.20.40.40.00.10.0-0.30.20.00.1-0.2-0.10.10.2-0.00.1-0.2-0.3-0.5-1.5-0.31.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax country:BR0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

country:GB


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-30
Value9.3-18.3-35.00000000000001-38.1-29.21.7-15.8-17.9-8.9-3.58.73.56.66.2-17.2-24.6-6.5-6.9-9.9-2.8-9.8-12.3121.9-2.910109.2-5.4
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest11.8-58.73181.8129.6-512.3-7.915.368.3-30.1-3.5-14.67.711.624.8-139.837.3-12.8-16.2-21.1-4.5-24.7-37.227.65.2-8.416.213.019.0-13.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.7-3.50.0-7.9-6.40.4-3.3-3.7-1.8-0.70.00.71.41.4-3.8-5.6-1.4-1.6-2.4-0.7-2.6-3.33.30.5-0.82.72.52.5-1.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax country:GB0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

country:IE


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-30
Value0.0-0.11.9-0.10.00.00.00.00.00.00.0-0.1-0.10.0-0.1-0.10.00.00.0-0.1-0.10.00.00.0-0.1-0.2-1.10.00.0
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest0.0-0.3-172.70.30.0-0.0-0.0-0.00.00.0-0.0-0.2-0.20.0-0.80.20.00.00.0-0.2-0.30.00.00.0-0.3-0.3-1.40.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.0-0.00.0-0.00.00.00.00.00.00.00.0-0.0-0.00.0-0.0-0.00.00.00.0-0.0-0.00.00.00.0-0.0-0.1-0.30.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax country:IE0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

country:IT


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0.40.9-0.1-0.9-1.83.4-3.3-3.60.2-0.73.8-1.8-1.10.00.00.00.00.0
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest0.52.99.13.1-31.6-15.73.213.70.7-0.7-6.4-4.0-1.90.00.0-0.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.20.0-0.2-0.40.8-0.7-0.70.0-0.10.0-0.4-0.20.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax country:IT0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

country:MT


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-30
Value0.30.5-1.6-1.1-1.32.63.4-5.6-0.70.9-0.51.8-0.60.9-1.40.60.50.60.40.90.10.20.1-0.30.20.3-0.4-0.8-0.6
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest0.41.6145.53.7-22.8-12.0-3.321.4-2.40.90.84.0-1.13.6-11.4-0.91.01.40.91.40.30.60.2-0.80.60.5-0.5-1.7-1.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.10.0-0.2-0.30.60.7-1.1-0.10.20.00.4-0.10.2-0.30.10.10.10.10.20.00.10.0-0.10.10.1-0.1-0.2-0.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax country:MT0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

country:US


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-30
Value6441387.467-10.7-14.37.72269-100.33485-6.310-1.33424372826235.7102028481320
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest81.3132.4-3518.2-25.21191.249.513.8-29.475.369.3168.076.8150.1-25.282.12.068.356.279.145.366.970.412.929.058.245.760.828.052.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.77.90.01.514.9-2.5-3.01.64.613.60.07.018.5-1.42.2-0.37.75.69.26.86.96.31.52.85.47.711.83.65.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax country:US0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxExpenseBenefit


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value8.91.4-1.80.212-2.80.5-1.10.88.9-16.14.7150.2-16.6-4.64.86.0147.08.75.43.00.96.83.6203.66.12.5181.9114.80.64.31.08.56.96.09.7-3.15.58.46.012
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.60.30.00.02.6-0.60.1-0.20.21.70.00.93.30.0-3.6-1.01.11.43.51.72.31.50.80.21.81.05.01.01.60.74.70.53.01.40.21.20.32.62.22.02.9-1.01.72.51.73.4

us-gaap:IncomeTaxExpenseBenefit dei:LegalEntity

argo:OtherSubsidiariesAndEliminations


Income
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-9.5-5.8-3.73.1-2.3-2.3-2.5-1.12.60.00.71.6-2.1-4.0-3.3-0.4
Percentage of IncomeTaxExpenseBenefit527.8-2900.0-30.6-110.7-460.0209.1-312.5-12.4-16.10.04.6800.012.787.0-68.8-6.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.0-1.2-0.80.7-0.5-0.5-0.5-0.20.00.00.20.4-0.5-0.9-0.7-0.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax argo:OtherSubsidiariesAndEliminations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:IncomeTaxExpenseBenefit us-gaap:ConsolidatedEntities

srt:SubsidiaryIssuer


Income
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value7.76.015-5.92.31.23.310.0-18.74.714
Percentage of IncomeTaxExpenseBenefit-427.83000.0130.6210.7460.0-109.1412.5112.4116.1100.095.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.01.23.5-1.40.50.20.72.00.00.93.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:SubsidiaryIssuer0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:IncomeTaxExpenseBenefit us-gaap:Restatement

srt:RestatementAdjustment


Income
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-3.6-0.81.80.50.00.05.0
Percentage of IncomeTaxExpenseBenefit-1800.0-6.6-64.3100.0-0.00.056.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.7-0.20.40.10.00.01.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:RestatementAdjustment0.00.00.00.00.00.00.0

srt:ScenarioPreviouslyReported


Income
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.212-2.80.0-1.10.88.9
Percentage of IncomeTaxExpenseBenefit100.0100.0100.00.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.02.6-0.60.0-0.20.21.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:ScenarioPreviouslyReported0.00.00.00.00.00.00.0

Income Taxes Paid

us-gaap:IncomeTaxesPaid

us-gaap:IncomeTaxesPaid


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-30
Value8.00.91.7441.30.3193.51.10.26.79.96.71.56.40.29.90.05.05.08.15.20.110.010
Percentage of IncomeTaxesPaid100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.50.20.09.20.30.14.00.70.20.00.02.01.40.31.40.02.20.01.51.62.51.70.03.43.1

Income Taxes Paid Net

us-gaap:IncomeTaxesPaidNet

us-gaap:IncomeTaxesPaidNet


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value8.00.81.5430.60.3193.41.10.26.79.96.71.56.40.29.90.0150.21.00.30.10.310.00.5-0.18.20.0150.19.15.02.52.95.0138.1
Percentage of IncomeTaxesPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.50.20.09.00.10.14.00.70.20.00.02.01.40.31.40.02.20.03.70.00.30.10.00.12.70.1-0.02.20.04.30.02.51.40.70.81.54.12.5

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
Value5.75.15.66.86.87.78.47.59.38.58.27.97.87.77.37.57.05.95.04.94.94.84.74.84.64.94.94.95.15.05.15.15.14.96.75.85.55.75.65.65.55.45.65.85.56.0
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 RevenueFromContractWithCustomerExcludingAssessedTax1.01.00.01.41.51.81.71.51.91.70.01.61.71.81.61.71.61.41.21.21.31.31.31.31.21.31.21.31.41.41.31.41.41.41.91.71.71.81.81.81.61.81.81.71.51.6

us-gaap:InterestExpense dei:LegalEntity

argo:OtherSubsidiariesAndEliminations


Interest
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value1.21.71.72.02.31.82.42.11.71.71.72.11.51.71.71.3
Percentage of InterestExpense21.425.025.026.027.424.025.824.720.721.521.827.320.522.724.322.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.40.40.50.50.40.50.40.00.30.40.50.30.40.40.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax argo:OtherSubsidiariesAndEliminations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:InterestExpense us-gaap:ConsolidatedEntities

srt:ParentCompany


Interest
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value0.30.81.11.41.51.71.71.71.71.61.6
Percentage of InterestExpense5.411.816.218.217.922.718.320.020.720.320.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.20.20.30.30.30.30.30.00.30.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:ParentCompany0.00.00.00.00.00.00.00.00.00.00.0

srt:SubsidiaryIssuer


Interest
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value4.14.34.04.34.54.05.24.74.84.64.5
Percentage of InterestExpense73.263.258.855.853.653.355.955.358.558.257.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.90.91.00.90.81.10.90.00.91.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:SubsidiaryIssuer0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:InterestExpense us-gaap:Restatement

srt:RestatementAdjustment


Interest
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.10.20.10.10.20.10.1
Percentage of InterestExpense1.52.91.31.22.71.11.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:RestatementAdjustment0.00.00.00.00.00.00.0

srt:ScenarioPreviouslyReported


Interest
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value6.86.87.78.37.59.38.5
Percentage of InterestExpense100.0100.0100.098.8100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.41.51.81.71.51.91.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:ScenarioPreviouslyReported0.00.00.00.00.00.00.0

Interest Paid Net

us-gaap:InterestPaidNet

us-gaap:InterestPaidNet


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value5.25.65.46.26.97.96.69.78.08.8
Percentage of InterestPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.91.10.01.31.51.81.42.01.61.7

us-gaap:InterestPaidNet us-gaap:LongtermDebtType

argo:OtherLongTermDebt


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.30.80.61.21.51.90.43.41.42.4
Percentage of InterestPaidNet5.814.311.119.421.724.16.135.117.527.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.20.00.20.30.40.10.70.30.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax argo:OtherLongTermDebt0.00.00.00.00.00.00.00.00.00.0

us-gaap:JuniorSubordinatedDebt


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value2.52.52.52.73.03.73.94.04.24.1
Percentage of InterestPaidNet48.144.646.343.543.546.859.141.252.546.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.50.50.00.60.70.80.80.80.90.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:JuniorSubordinatedDebt0.00.00.00.00.00.00.00.00.00.0

us-gaap:SeniorNotes


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value2.42.32.32.32.42.32.32.32.42.3
Percentage of InterestPaidNet46.241.142.637.134.829.134.823.730.026.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.40.40.00.50.50.50.50.50.50.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:SeniorNotes0.00.00.00.00.00.00.00.00.00.0

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value69290.7-29.6-6.4-18.8-103.3-25.12891-43.640412428-61.3463632553027413527585944384047313132-4.71324191.4-12.122-94.512232620
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax12.75.70.0-6.1-1.4-4.3-21.3-5.15.917.90.08.19.05.76.3-14.010.28.68.113.28.07.511.29.57.515.814.512.010.311.211.98.58.79.6-1.33.97.56.10.4-4.06.8-31.84.06.97.25.6

us-gaap:NetIncomeLoss dei:LegalEntity

argo:OtherSubsidiariesAndEliminations


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-16.3-25.4-51.4-4.1-67.8-26.620354016-21.6343.2-53.02428
Percentage of NetIncomeLoss-2328.685.8803.121.865.6106.070.538.4-92.440.4-51.7140.311.186.553.978.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.0-5.3-11.2-0.9-14.0-5.54.26.90.03.3-4.78.00.7-12.15.56.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax argo:OtherSubsidiariesAndEliminations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:ConsolidatedEntities

srt:ParentCompany


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value0.7-29.6-6.4-18.8-103.3-25.12891-43.64041
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.0-6.1-1.4-4.3-21.3-5.15.917.90.08.19.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:ParentCompany0.00.00.00.00.00.00.00.00.00.00.0

srt:SubsidiaryIssuer


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value321.350-4.8-16.56.41959-81.73071
Percentage of NetIncomeLoss4685.7-4.4-789.125.516.0-25.566.365.1187.473.9169.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.311.1-1.1-3.41.33.911.70.06.015.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:SubsidiaryIssuer0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:ConsolidationItems

srt:ConsolidationEliminations


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-16.5240.98.98420-39.4-94.441-46.4-49.4
Percentage of NetIncomeLoss-2357.1-81.4-14.1-47.3-81.6-80.5-136.8-103.5-95.0-114.3-118.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.05.00.22.017.44.1-8.1-18.50.0-9.3-10.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:ConsolidationEliminations0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:Restatement

srt:RestatementAdjustment


Net
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value6.51.0-5.90.6-0.9-1.8-3.6
Percentage of NetIncomeLoss-22.0-15.631.4-0.63.6-6.2-3.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.30.2-1.40.1-0.2-0.4-0.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:RestatementAdjustment0.00.00.00.00.00.00.0

srt:ScenarioPreviouslyReported


Net
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-29.6-6.4-18.8-103.3-25.12891
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-6.1-1.4-4.3-21.3-5.15.917.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:ScenarioPreviouslyReported0.00.00.00.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value69290.7-29.6-6.4-18.8-103.3-25.12891-43.640412428-61.34636
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax12.75.70.0-6.1-1.4-4.3-21.3-5.15.917.90.08.19.05.76.3-14.010.28.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss Available To Common Stockholders Basic

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value6727-1.9-31.6-5.4-24.7-109.0-25.1
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax12.35.20.0-6.5-1.2-5.7-22.5-5.1

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic dei:LegalEntity

argo:OtherSubsidiariesAndEliminations


Net
Period End2020-12-312020-09-30
Value-16.3-25.4
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic857.980.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.0-5.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax argo:OtherSubsidiariesAndEliminations0.00.0

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic us-gaap:ConsolidatedEntities

srt:ParentCompany


Net
Period End2020-12-312020-09-30
Value-1.9-31.6
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.0-6.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:ParentCompany0.00.0

srt:SubsidiaryIssuer


Net
Period End2020-12-312020-09-30
Value321.3
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic-1726.3-4.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:SubsidiaryIssuer0.00.0

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic us-gaap:ConsolidationItems

srt:ConsolidationEliminations


Net
Period End2020-12-312020-09-30
Value-16.524
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic868.4-76.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.05.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:ConsolidationEliminations0.00.0

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic us-gaap:Restatement

srt:RestatementAdjustment


Net
Period End2020-09-302019-09-30
Value6.5-0.9
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic-20.63.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.3-0.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:RestatementAdjustment0.00.0

srt:ScenarioPreviouslyReported


Net
Period End2020-09-302019-09-30
Value-31.6-25.1
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-6.5-5.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:ScenarioPreviouslyReported0.00.0

Net Income Loss Available To Common Stockholders Diluted

us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted

us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted


Net
Period End2021-06-302020-06-30
Value67-5.4
Percentage of NetIncomeLossAvailableToCommonStockholdersDiluted100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax12.3-1.2

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
Value524433421.53534404233293433363530433025323521212121202120202322242527282830312930323333333333
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 RevenueFromContractWithCustomerExcludingAssessedTax9.68.50.08.70.38.17.18.28.86.70.06.97.28.27.77.09.77.16.37.89.35.75.95.75.85.65.35.65.56.55.76.67.08.28.18.49.49.79.39.99.811.210.510.19.19.1

us-gaap:NetInvestmentIncome dei:LegalEntity

argo:OtherSubsidiariesAndEliminations


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value9.69.2-4.310111315101214141413151413
Percentage of NetInvestmentIncome28.521.9-286.730.732.733.335.731.943.940.644.940.638.650.233.743.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.01.9-0.92.52.32.73.12.10.02.83.23.33.03.53.33.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax argo:OtherSubsidiariesAndEliminations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetInvestmentIncome us-gaap:ConsolidatedEntities

srt:SubsidiaryIssuer


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value24325.82423272823172119
Percentage of NetInvestmentIncome71.578.1386.769.369.368.965.770.258.561.257.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.06.81.35.64.95.75.84.70.04.24.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:SubsidiaryIssuer0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetInvestmentIncome us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value4.02.80.60.50.10.50.10.40.40.32.12.62.12.43.22.43.31.90.91.71.5-0.9
Percentage of NetInvestmentIncome7.66.31.81.26.71.40.31.00.90.97.17.56.36.79.17.87.66.23.55.24.2-4.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.70.50.00.10.00.10.00.10.10.10.00.50.50.50.70.50.70.40.20.40.4-0.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CorporateNonSegment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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

us-gaap:OperatingSegments, argo:InternationalOperations


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value13127.79.90.58.61210119.17.38.48.48.88.37.710
Percentage of NetInvestmentIncome26.427.022.823.633.324.237.726.626.926.824.824.325.324.423.724.923.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.52.30.02.00.12.02.72.22.41.80.01.71.82.01.81.82.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments argo:InternationalOperations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, argo:RunOffLines


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value1.10.81.21.50.11.21.31.71.31.41.82.12.02.22.32.02.9
Percentage of NetInvestmentIncome2.11.83.63.66.73.43.84.23.04.16.16.16.06.16.66.56.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.20.20.00.30.00.30.30.30.30.30.00.40.40.50.50.50.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments argo:RunOffLines0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, argo:USOperations


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value332824300.8251927292318212022211827
Percentage of NetInvestmentIncome63.964.971.871.753.371.058.268.269.268.161.962.062.362.860.660.862.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.25.50.06.20.25.84.15.66.14.50.04.34.55.24.74.36.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments argo:USOperations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Other Comprehensive Income Loss Net Of Tax

us-gaap:OtherComprehensiveIncomeLossNetOfTax

us-gaap:OtherComprehensiveIncomeLossNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value19-54.42131107-110.4-1.9-4.23650-20.0-4.2-21.7-32.0-0.4161813-23.52.12828-12.0-53.6-9.0-22.0-28.4-37.9251.1-4.016-66.913-14.646-17.83525-51.19.7
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.5-10.40.06.423.6-25.3-0.4-0.97.59.90.0-0.8-4.7-7.3-0.13.84.13.2-5.80.57.57.8-3.3-14.4-2.4-5.9-6.9-10.26.80.3-1.04.5-18.43.8-4.213.5-5.611.08.1-16.82.9

Preferred Stock Dividends Income Statement Impact

us-gaap:PreferredStockDividendsIncomeStatementImpact

us-gaap:PreferredStockDividendsIncomeStatementImpact


Preferred
Period End2021-06-302021-03-312020-12-312020-09-30
Value2700000.02600000.02600000.02000000.0
Percentage of PreferredStockDividendsIncomeStatementImpact100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.50.50.00.4

us-gaap:PreferredStockDividendsIncomeStatementImpact us-gaap:ConsolidatedEntities

srt:ParentCompany


Preferred
Period End2020-12-312020-09-30
Value2600000.02000000.0
Percentage of PreferredStockDividendsIncomeStatementImpact100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:ParentCompany0.00.0

Premiums Earned Net

us-gaap:PremiumsEarnedNet

us-gaap:PremiumsEarnedNet


Premiums
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value470466466445433435425451431420452446417414404389399379362358344344345346346334338337336325341330327304314304290277281268271261274288324323
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 RevenueFromContractWithCustomerExcludingAssessedTax85.989.00.092.194.899.787.992.688.482.60.089.690.294.988.788.688.588.689.486.189.793.293.693.092.790.182.290.989.690.485.390.890.089.189.788.391.385.888.288.480.788.086.886.789.586.9

us-gaap:PremiumsEarnedNet dei:LegalEntity

argo:OtherSubsidiariesAndEliminations


Premiums
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value162147132133174186171154237224150257260244263248
Percentage of PremiumsEarnedNet34.933.130.630.740.941.239.736.652.550.136.162.264.462.766.065.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.030.529.030.635.938.235.130.20.044.932.559.057.155.658.458.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax argo:OtherSubsidiariesAndEliminations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:PremiumsEarnedNet us-gaap:ConsolidatedEntities

srt:SubsidiaryIssuer


Premiums
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value303298300301251265260266215222267
Percentage of PremiumsEarnedNet65.166.969.469.359.158.860.363.447.549.963.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.061.765.869.152.054.553.252.30.044.757.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:SubsidiaryIssuer0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:PremiumsEarnedNet us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, argo:InternationalOperations


Premiums
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value155151161146131132154160147146181168150152160146169
Percentage of PremiumsEarnedNet33.132.534.732.930.430.436.335.634.234.940.037.736.036.739.837.742.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax28.428.90.030.328.830.331.933.030.228.80.033.832.534.935.333.437.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments argo:InternationalOperations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, argo:RunOffLines


Premiums
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312017-09-302017-06-30
Value0.10.20.10.10.00.20.10.00.10.00.00.10.2-0.1-0.10.1
Percentage of PremiumsEarnedNet0.00.00.00.00.00.00.00.00.00.00.00.00.0-0.0-0.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.00.00.00.00.00.00.00.00.00.00.00.0-0.0-0.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments argo:RunOffLines0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, argo:USOperations


Premiums
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value314314304298301302271290284273271278267262243242229
Percentage of PremiumsEarnedNet66.967.565.367.069.669.563.764.465.865.160.062.363.963.360.262.357.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax57.460.00.061.866.069.355.959.758.153.80.055.857.660.053.555.250.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments argo:USOperations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:PremiumsEarnedNet us-gaap:StatementGeographical

argo:OtherJurisdiction


Premiums
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value17151415121516141213181113131211
Percentage of PremiumsEarnedNet3.73.33.13.52.93.63.93.22.93.24.12.63.23.13.03.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.22.90.03.22.83.63.43.02.62.60.02.32.93.02.72.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax argo:OtherJurisdiction0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

country:BM


Premiums
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value102522272521202419162023202020232325262929282626262325272424262722253632282225212529
Percentage of PremiumsEarnedNet2.35.44.96.15.84.94.85.44.43.94.65.25.04.95.06.05.86.77.38.18.48.17.77.77.57.17.68.07.27.57.78.36.78.511.710.79.98.09.07.99.411.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.04.80.05.65.54.94.35.03.93.30.04.74.54.74.45.35.16.06.57.07.57.67.27.27.06.46.37.36.56.86.67.56.17.610.59.59.06.97.97.07.69.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax country:BM0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

country:GB


Premiums
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value1169910890758695101969712211710211412810913311810510298100101991041011051041029810597111878984757071677050
Percentage of PremiumsEarnedNet24.821.223.220.317.419.922.522.622.423.127.126.224.427.531.728.033.431.329.228.528.429.229.528.630.230.531.230.930.530.430.929.634.028.628.527.926.225.425.325.126.019.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax21.318.90.018.716.519.919.820.919.819.10.023.522.026.128.124.829.627.826.124.625.527.227.626.628.027.425.728.127.327.526.426.830.625.525.624.623.921.822.322.221.017.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax country:GB0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

country:MT


Premiums
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value111416131811222120202118155.76.12.71.31.00.50.60.50.50.50.50.40.50.50.50.60.50.50.50.40.4
Percentage of PremiumsEarnedNet2.33.03.52.94.32.75.34.74.74.94.74.13.81.41.50.70.30.30.10.20.10.10.10.10.10.10.10.10.20.20.10.20.10.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.02.70.02.74.02.74.74.44.14.10.03.63.41.31.30.60.30.20.10.10.10.10.10.10.10.10.10.10.20.10.10.10.10.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax country:MT0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

country:US


Premiums
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value314312304299301299270289283272269276265261238242229221219216207206207209203195197194196189200195183181179180180178181182175181
Percentage of PremiumsEarnedNet66.867.165.367.169.568.963.564.165.664.859.561.963.663.058.862.357.458.360.760.360.159.960.260.558.758.558.457.758.658.158.659.056.159.557.159.262.264.364.668.064.769.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax57.459.70.061.966.068.755.859.458.053.50.055.457.459.852.255.250.851.754.251.953.955.856.356.354.452.748.052.452.552.650.053.650.553.051.252.356.755.257.060.152.361.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax country:US0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Realized Investment Gains Losses

us-gaap:RealizedInvestmentGainsLosses

us-gaap:RealizedInvestmentGainsLosses


Realized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value4.0-1.3-10.899999999999997-5.7112762-6.21252-81.01410-15.7146.04.5145.31651121811419.1119.57.08.3-2.713113.9312.38.29.15.014
Percentage of RealizedInvestmentGainsLosses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.7-0.20.0-1.22.46.412.9-1.32.510.30.02.82.3-3.63.11.41.03.41.44.312.53.54.93.110.42.53.02.82.02.4-0.84.13.61.39.40.82.62.71.43.9

us-gaap:RealizedInvestmentGainsLosses us-gaap:Restatement

srt:RestatementAdjustment


Realized
Period End2020-09-302020-06-302020-03-31
Value0.00.0-0.1
Percentage of RealizedInvestmentGainsLosses-0.00.0-0.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.0-0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:RestatementAdjustment0.00.00.0

srt:ScenarioPreviouslyReported


Realized
Period End2020-09-302020-06-302020-03-31
Value-5.71127
Percentage of RealizedInvestmentGainsLosses100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-1.22.46.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:ScenarioPreviouslyReported0.00.00.0

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
Value547523516483457436484487488509402498463437455439451428405416384370369372373371412371375360400364364341350344318323318303336297316333362372
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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
Value547523516483457436484487488509-498.9498463437455439451428405416384370369372373371412371375360400364364341350344318323318303336297316333362372
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 RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0-123.9100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Revenues dei:LegalEntity

argo:OtherSubsidiariesAndEliminations


Revenuesdei:
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value181156115150188195185172236237162273274259278262
Percentage of Revenues35.132.325.334.438.940.037.933.9-47.547.635.062.660.259.161.861.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax35.132.325.334.438.940.037.933.958.847.635.062.660.259.161.861.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax argo:OtherSubsidiariesAndEliminations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Revenues us-gaap:ConsolidatedEntities

srt:ParentCompany


Revenuesus-gaap:
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-9.60.01.4-0.151-1.2-0.7-0.838-0.9-0.2
Percentage of Revenues-1.90.00.3-0.010.7-0.2-0.1-0.2-7.7-0.2-0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-1.90.00.3-0.010.7-0.2-0.1-0.29.6-0.2-0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:ParentCompany0.00.00.00.00.00.00.00.00.00.00.0

srt:SubsidiaryIssuer


Revenuesus-gaap:
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value345327340286296293303337166262301
Percentage of Revenues66.867.774.465.661.260.262.266.2-33.452.665.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax66.867.774.465.661.260.262.266.241.352.665.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:SubsidiaryIssuer0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Revenues us-gaap:Restatement

srt:RestatementAdjustment


Revenuesus-gaap:
Period End2020-09-302020-06-302019-12-312019-09-302019-06-302019-03-31
Value0.0-1.80.10.00.00.2
Percentage of Revenues0.0-0.40.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.0-0.40.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:RestatementAdjustment0.00.00.00.00.00.0

srt:ScenarioPreviouslyReported


Revenuesus-gaap:
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value483457436484487488509
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:ScenarioPreviouslyReported0.00.00.00.00.00.00.0

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
Value10368103481046510734103961020110514104451016699549558927991059141876490588240801972057181696068196630662765446377635663886421643165916650657566026688664963476339640165026513633564816896
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 dei:LegalEntity

argo:OtherSubsidiariesAndEliminations


Assetsdei:
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value3932417539973894426441714060388137143472347535233232
Percentage of Assets37.638.938.538.240.639.939.939.038.937.438.238.536.9
Percentage of Assets37.638.938.538.240.639.939.939.038.937.438.238.536.9
Percentage of Assets argo:OtherSubsidiariesAndEliminations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Assets us-gaap:ConsolidatedEntities

srt:ParentCompany


Assetsus-gaap:
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value19061991196318641974211621391915
Percentage of Assets18.218.518.918.318.820.321.020.0
Percentage of Assets18.218.518.918.318.820.321.020.0
Percentage of Assets srt:ParentCompany100.0100.0100.0100.0100.0100.0100.0100.0

srt:SubsidiaryIssuer


Assetsus-gaap:
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value65096499634062386192621160445781
Percentage of Assets62.260.661.061.258.959.559.460.5
Percentage of Assets62.260.661.061.258.959.559.460.5
Percentage of Assets srt:SubsidiaryIssuer100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Assets us-gaap:ConsolidationItems

srt:ConsolidationEliminations


Assetsus-gaap:
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value-1881.9-1932.2-1904.2-1796.7-1916.7-2053.6-2076.9-1852.7
Percentage of Assets-18.0-18.0-18.3-17.6-18.2-19.7-20.4-19.4
Percentage of Assets-18.0-18.0-18.3-17.6-18.2-19.7-20.4-19.4
Percentage of Assets srt:ConsolidationEliminations100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CorporateNonSegment


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value512570198192188216146188184191420426398462
Percentage of Assets4.95.51.91.81.82.11.41.81.81.94.44.64.45.3
Percentage of Assets4.95.51.91.81.82.11.41.81.81.94.44.64.45.3
Percentage of Assets us-gaap:CorporateNonSegment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Assets us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, argo:InternationalOperations


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value38983809389941404132399150024403438042193984377037623553
Percentage of Assets37.636.837.338.639.739.147.642.243.142.441.740.641.340.5
Percentage of Assets37.636.837.338.639.739.147.642.243.142.441.740.641.340.5
Percentage of Assets us-gaap:OperatingSegments argo:InternationalOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, argo:RunOffLines


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value253264335334331336356375367364444466453449
Percentage of Assets2.42.63.23.13.23.33.43.63.63.74.75.05.05.1
Percentage of Assets2.42.63.23.13.23.33.43.63.63.74.75.05.05.1
Percentage of Assets us-gaap:OperatingSegments argo:RunOffLines100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, argo:USOperations


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value57045705603260655744565650095477523451794707461644904298
Percentage of Assets55.055.157.656.555.355.547.652.451.552.049.349.749.349.0
Percentage of Assets55.055.157.656.555.355.547.652.451.552.049.349.749.349.0
Percentage of Assets us-gaap:OperatingSegments argo:USOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Assets us-gaap:Restatement

srt:RestatementAdjustment


Assetsus-gaap:
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-12.6-18.4-23.4-5.7-11.4-13.3-11.6
Percentage of Assets-0.1-0.2-0.2-0.1-0.1-0.1-0.1
Percentage of Assets-0.1-0.2-0.2-0.1-0.1-0.1-0.1
Percentage of Assets srt:RestatementAdjustment100.0100.0100.0100.0100.0100.0100.0

srt:ScenarioPreviouslyReported


Assetsus-gaap:
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1073410396102011051410445101669954
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets srt:ScenarioPreviouslyReported100.0100.0100.0100.0100.0100.0100.0

Liabilities

us-gaap:Liabilities

us-gaap:Liabilities


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value84708527860888698666856487338552823780737811746173087353694472506349618454125392522051144962498648754714470947614788483650285123508450555174510748534833492250364965481548555281
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 Assets81.782.482.282.683.484.083.181.981.081.181.780.480.380.479.280.077.077.175.175.175.075.074.875.274.573.974.174.574.675.276.377.077.376.677.476.876.576.276.977.576.276.074.976.6

us-gaap:Liabilities dei:LegalEntity

argo:OtherSubsidiariesAndEliminations


Liabilitiesdei:
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value3364359633983255354033603202303729192682268226872383
Percentage of Liabilities39.140.639.238.040.539.338.937.637.436.036.736.534.3
Percentage of Assets32.133.532.731.933.732.231.530.530.528.929.529.427.2
Percentage of Assets argo:OtherSubsidiariesAndEliminations85.686.185.083.683.080.678.978.378.677.277.276.373.7

us-gaap:Liabilities us-gaap:ConsolidatedEntities

srt:ParentCompany


Liabilitiesus-gaap:
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value48126233227193222210169
Percentage of Liabilities0.61.42.72.72.22.62.62.2
Percentage of Assets0.51.22.22.21.82.12.11.8
Percentage of Assets srt:ParentCompany2.56.411.912.29.810.59.88.8

srt:SubsidiaryIssuer


Liabilitiesus-gaap:
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value52025233510251395018501948574731
Percentage of Liabilities60.459.058.960.057.558.759.060.6
Percentage of Assets49.748.849.150.447.748.147.849.5
Percentage of Assets srt:SubsidiaryIssuer79.980.580.582.481.180.880.481.9

us-gaap:Liabilities us-gaap:ConsolidationItems

srt:ConsolidationEliminations


Liabilitiesus-gaap:
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value-7.5-87.7-67.3-57.9-19.3-50.5-32.6-8.5
Percentage of Liabilities-0.1-1.0-0.8-0.7-0.2-0.6-0.4-0.1
Percentage of Assets-0.1-0.8-0.6-0.6-0.2-0.5-0.3-0.1
Percentage of Assets srt:ConsolidationEliminations0.44.53.53.21.02.51.60.5

us-gaap:Liabilities us-gaap:Restatement

srt:RestatementAdjustment


Liabilitiesus-gaap:
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value3.23.9-0.1116.63.83.7
Percentage of Liabilities0.00.0-0.00.10.10.00.0
Percentage of Assets0.00.0-0.00.10.10.00.0
Percentage of Assets srt:RestatementAdjustment-25.4-21.20.4-205.3-57.9-28.6-31.9

srt:ScenarioPreviouslyReported


Liabilitiesus-gaap:
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value8869866685648733855282378073
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets82.683.484.083.181.981.081.1
Percentage of Assets srt:ScenarioPreviouslyReported82.683.484.083.181.981.081.1

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
Value10368103481046510734103961020110514104451016699549558927991059141876490588240801972057181696068196630662765446377635663886421643165916650657566026688664963476339640165026513633564816896
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 dei:LegalEntity

argo:OtherSubsidiariesAndEliminations


Liabilities
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value3932417539973894426441714060388137143472347535233232
Percentage of LiabilitiesAndStockholdersEquity37.638.938.538.240.639.939.939.038.937.438.238.536.9
Percentage of Assets37.638.938.538.240.639.939.939.038.937.438.238.536.9
Percentage of Assets argo:OtherSubsidiariesAndEliminations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilitiesAndStockholdersEquity us-gaap:ConsolidatedEntities

srt:ParentCompany


Liabilities
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value19061991196318641974211621391915
Percentage of LiabilitiesAndStockholdersEquity18.218.518.918.318.820.321.020.0
Percentage of Assets18.218.518.918.318.820.321.020.0
Percentage of Assets srt:ParentCompany100.0100.0100.0100.0100.0100.0100.0100.0

srt:SubsidiaryIssuer


Liabilities
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value65096499634062386192621160445781
Percentage of LiabilitiesAndStockholdersEquity62.260.661.061.258.959.559.460.5
Percentage of Assets62.260.661.061.258.959.559.460.5
Percentage of Assets srt:SubsidiaryIssuer100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilitiesAndStockholdersEquity us-gaap:ConsolidationItems

srt:ConsolidationEliminations


Liabilities
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value-1881.9-1932.2-1904.2-1796.7-1916.7-2053.6-2076.9-1852.7
Percentage of LiabilitiesAndStockholdersEquity-18.0-18.0-18.3-17.6-18.2-19.7-20.4-19.4
Percentage of Assets-18.0-18.0-18.3-17.6-18.2-19.7-20.4-19.4
Percentage of Assets srt:ConsolidationEliminations100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilitiesAndStockholdersEquity us-gaap:Restatement

srt:RestatementAdjustment


Liabilities
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-12.6-18.4-23.4-5.7-11.4-13.3-11.6
Percentage of LiabilitiesAndStockholdersEquity-0.1-0.2-0.2-0.1-0.1-0.1-0.1
Percentage of Assets-0.1-0.2-0.2-0.1-0.1-0.1-0.1
Percentage of Assets srt:RestatementAdjustment100.0100.0100.0100.0100.0100.0100.0

srt:ScenarioPreviouslyReported


Liabilities
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1073410396102011051410445101669954
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets srt:ScenarioPreviouslyReported100.0100.0100.0100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value1897182118571864173016361781189319291880174618181797178718191808189118341792178817401705166816411668166216461626163315941563152714911546151415411493150614791466154815201626161413521384
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets18.317.617.817.416.616.016.918.119.018.918.319.619.719.620.820.023.022.924.924.925.025.025.224.825.526.125.925.525.424.823.723.022.723.422.623.223.523.823.122.523.824.025.123.40.00.0

us-gaap:StockholdersEquity dei:LegalEntity

argo:OtherSubsidiariesAndEliminations


Stockholders
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value567578599639724810857844795790792835849
Percentage of StockholdersEquity30.631.034.639.140.642.844.544.945.543.544.146.846.7
Percentage of Assets5.45.45.86.36.97.88.48.58.38.58.79.19.7
Percentage of Assets argo:OtherSubsidiariesAndEliminations14.413.915.016.417.019.421.121.721.422.822.823.726.3

us-gaap:StockholdersEquity us-gaap:ConsolidatedEntities

srt:ParentCompany


Stockholders
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value18571864173016361781189319291746
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets17.817.416.616.016.918.119.018.3
Percentage of Assets srt:ParentCompany97.593.688.187.890.289.590.291.2

srt:SubsidiaryIssuer


Stockholders
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value13061265123710991173119211861049
Percentage of StockholdersEquity70.367.971.567.265.963.061.560.1
Percentage of Assets12.511.811.910.811.211.411.711.0
Percentage of Assets srt:SubsidiaryIssuer20.119.519.517.618.919.219.618.1

us-gaap:StockholdersEquity us-gaap:ConsolidationItems

srt:ConsolidationEliminations


Stockholders
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value-1874.4-1844.5-1836.9-1738.8-1897.4-2003.1-2044.3-1844.2
Percentage of StockholdersEquity-100.9-98.9-106.2-106.2-106.5-105.8-106.0-105.6
Percentage of Assets-17.9-17.2-17.7-17.0-18.0-19.2-20.1-19.3
Percentage of Assets srt:ConsolidationEliminations99.695.596.596.899.097.598.499.5

us-gaap:StockholdersEquity us-gaap:Restatement

srt:RestatementAdjustment


Stockholders
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-15.8-22.3-23.3-17.4-18.0-17.1-15.3
Percentage of StockholdersEquity-0.8-1.3-1.4-1.0-1.0-0.9-0.8
Percentage of Assets-0.1-0.2-0.2-0.2-0.2-0.2-0.2
Percentage of Assets srt:RestatementAdjustment125.4121.299.6305.3157.9128.6131.9

srt:ScenarioPreviouslyReported


Stockholders
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1864173016361781189319291880
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets17.416.616.016.918.119.018.9
Percentage of Assets srt:ScenarioPreviouslyReported17.416.616.016.918.119.018.9

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value-7.1-8.6-8.6-8.1-8.1-8.1-8.1-6.7-6.7-6.7-6.7-7.7-7.7-6.3-6.3-7.1-7.1-7.1
Percentage of StockholdersEquity-0.4-0.5-0.5-0.4-0.5-0.5-0.5-0.4-0.3-0.4-0.4-0.4-0.4-0.4-0.3-0.4-0.4-0.4
Percentage of Assets-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value65511057944-67.83333381.3-49.0-26.6-23.2-5.612112110572
Percentage of StockholdersEquity3.52.85.74.32.6-4.11.91.82.00.1-2.8-1.5-1.3-0.36.76.75.64.0
Percentage of Assets0.60.51.00.70.4-0.70.30.30.40.0-0.5-0.3-0.3-0.11.41.31.31.0
Percentage of Assets us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-31
Value234.258365.9-101.92.84.78.9-27.6-78.1-58.1-53.9-32.0969780614711108147189139147107-22.275
Percentage of StockholdersEquity1.20.23.22.00.3-6.20.20.20.5-1.5-4.5-3.2-3.0-1.85.35.44.23.42.70.76.69.512.59.59.16.7-1.65.5
Percentage of Assets0.20.00.60.30.1-1.00.00.00.1-0.3-0.8-0.6-0.6-0.41.11.11.00.80.70.21.72.22.82.22.31.60.00.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value-35.4-38.8-37.9-34.9-30.2-26.0-22.6-22.5-22.5-22.2-22.4-23.8-23.0-20.1-19.0-17.8-18.2-17.6
Percentage of StockholdersEquity-1.9-2.1-2.0-1.9-1.7-1.6-1.3-1.2-1.2-1.2-1.3-1.3-1.3-1.1-1.0-1.0-1.0-1.0
Percentage of Assets-0.3-0.4-0.4-0.3-0.3-0.3-0.2-0.2-0.2-0.2-0.2-0.3-0.3-0.2-0.2-0.2-0.2-0.2
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-31
Value1383138113801378137613741376137313691374137213681365136411291129112511221123964836827722716711702694685
Percentage of StockholdersEquity72.975.974.373.979.684.077.372.571.073.178.575.376.076.462.062.559.561.262.757.850.852.947.748.543.743.551.349.5
Percentage of Assets13.313.313.212.813.213.513.113.113.513.814.414.715.014.912.912.513.714.015.614.613.212.610.811.211.010.20.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-31
Value46464646464545454545454545444040404040373434313131313030
Percentage of StockholdersEquity2.42.52.52.52.72.82.62.42.42.42.62.52.52.52.22.22.12.22.22.22.12.22.12.11.91.92.32.2
Percentage of Assets0.40.40.40.40.40.40.40.40.40.50.50.50.50.50.50.40.50.50.60.60.50.50.50.50.50.40.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-31
Value7567006847147567738119259599438629158848519779561026988959985969804776752847779655592
Percentage of StockholdersEquity39.938.536.838.343.747.345.548.949.850.149.450.449.247.753.752.954.253.953.559.158.951.551.350.852.148.348.442.8
Percentage of Assets7.36.86.56.77.37.67.78.99.49.59.09.99.79.311.110.612.512.313.314.915.312.211.611.713.111.30.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-31
Value-455.1-455.1-455.1-455.1-455.1-455.1-455.1-455.1-455.1-455.1-455.1-453.4-443.8-442.0-423.4-414.8-381.0-378.2-378.2-331.1-301.4-250.6-205.5-160.9-111.6-5.1-5.10.0
Percentage of StockholdersEquity-24.0-25.0-24.5-24.4-26.3-27.8-25.6-24.0-23.6-24.2-26.1-24.9-24.7-24.7-23.3-22.9-20.1-20.6-21.1-19.8-18.3-16.0-13.6-10.9-6.9-0.3-0.40.0
Percentage of Assets-4.4-4.4-4.3-4.2-4.4-4.5-4.3-4.4-4.5-4.6-4.8-4.9-4.9-4.8-4.8-4.6-4.6-4.7-5.2-5.0-4.7-3.8-3.1-2.5-1.7-0.10.00.0
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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
Value1901561483001871581371451821521391181261731762352141908612312012212196106898173136149157141102919514275891001194910583666939185.213
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 Assets1.81.51.42.81.81.61.31.41.81.51.51.31.41.92.02.62.62.41.21.71.71.81.81.51.61.41.31.12.12.32.42.11.61.41.42.11.21.41.61.80.81.71.30.00.00.00.30.00.0

us-gaap:Cash dei:LegalEntity

argo:OtherSubsidiariesAndEliminations


Cashdei:
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value12816314411610498152117105821061141271621681493232
Percentage of Cash86.354.676.873.475.768.183.476.976.069.984.065.672.468.878.578.437.627.0
Percentage of Assets1.21.51.41.11.00.91.51.21.10.91.21.21.51.82.01.90.40.5
Percentage of Assets argo:OtherSubsidiariesAndEliminations3.33.93.63.02.42.43.73.02.82.43.13.24.00.00.00.00.00.0

us-gaap:Cash us-gaap:ConsolidatedEntities

srt:ParentCompany


Cashus-gaap:
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312017-12-312016-12-31
Value3.02.91.91.81.93.21.91.70.90.0
Percentage of Cash2.01.01.01.11.42.21.01.20.50.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.0
Percentage of Assets srt:ParentCompany0.20.10.10.10.10.20.10.10.00.0

srt:SubsidiaryIssuer


Cashus-gaap:
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value17133414031432831
Percentage of Cash11.744.522.225.522.929.715.522.8
Percentage of Assets0.21.20.40.40.30.40.30.3
Percentage of Assets srt:SubsidiaryIssuer0.32.10.70.60.50.70.50.5

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-31
Value19015614830018715813714518215213911812617686
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.81.51.42.81.81.61.31.41.81.51.51.31.42.01.2

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents dei:LegalEntity

argo:OtherSubsidiariesAndEliminations


Cash
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-31
Value128163144116104981521171058210612732
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents86.354.676.873.475.768.183.476.976.069.984.072.437.6
Percentage of Assets1.21.51.41.11.00.91.51.21.10.91.21.50.4
Percentage of Assets argo:OtherSubsidiariesAndEliminations3.33.93.63.02.42.43.73.02.82.43.14.00.0

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents us-gaap:ConsolidatedEntities

srt:ParentCompany


Cash
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-31
Value3.02.91.91.81.93.21.91.91.71.71.00.90.0
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents2.01.01.01.11.42.21.01.21.21.40.80.50.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets srt:ParentCompany0.20.10.10.10.10.20.10.00.10.00.00.00.0

srt:SubsidiaryIssuer


Cash
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-31
Value171334140314328333134194753
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents11.744.522.225.522.929.715.521.822.828.715.227.162.4
Percentage of Assets0.21.20.40.40.30.40.30.30.30.40.20.50.7
Percentage of Assets srt:SubsidiaryIssuer0.32.10.70.60.50.70.50.00.50.00.00.00.0

Short Term Investments

us-gaap:ShortTermInvestments us-gaap:ConsolidatedEntities

us-gaap:ShortTermInvestments

srt:ParentCompany


Short
Period End2020-12-312019-12-312018-12-31
Value0.60.63.8
Percentage of ShortTermInvestments100.0100.0100.0
Percentage of Assets0.00.00.0
Percentage of Assets srt:ParentCompany0.00.00.2

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment


Accumulated
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value163153146124101858165534638
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.61.51.51.41.41.31.31.00.80.70.6

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:PropertyPlantAndEquipmentNet


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value13014015415114213310279684944
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.21.31.61.72.02.01.61.21.00.80.7

Investments In Affiliates Subsidiaries Associates And Joint Ventures

us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures us-gaap:ConsolidatedEntities

us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures

srt:ParentCompany


Investments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value18811932190417961916205320761852
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets18.018.018.317.618.219.720.419.4
Percentage of Assets srt:ParentCompany98.797.097.096.497.197.097.196.7

us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures us-gaap:ConsolidationItems

srt:ConsolidationEliminations


Investments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value-1881.9-1932.2-1904.2-1796.7-1916.7-2053.6-2076.9-1852.7
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0
Percentage of Assets-18.0-18.0-18.3-17.6-18.2-19.7-20.4-19.4
Percentage of Assets srt:ConsolidationEliminations100.0100.0100.0100.0100.0100.0100.0100.0

Goodwill

us-gaap:Goodwill

us-gaap:Goodwill


Goodwill
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
Value147147147156156161161177177177177161161161161152152152152152152152152152152152152153153153153153153153153153153153153153153153153152
Percentage of Goodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.41.41.41.51.51.61.51.71.71.81.91.71.81.81.81.71.81.92.12.12.22.22.32.32.32.42.42.42.42.42.32.32.32.32.32.32.42.42.42.42.42.42.42.2

us-gaap:Goodwill us-gaap:StatementBusinessSegments

argo:InternationalOperations


Goodwillus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-31
Value28375337
Percentage of Goodwill19.523.530.223.5
Percentage of Assets0.30.40.60.4
Percentage of Assets argo:InternationalOperations0.00.00.01.1

argo:USOperations


Goodwillus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-31
Value118123123123
Percentage of Goodwill80.576.569.876.5
Percentage of Assets1.11.21.31.4
Percentage of Assets argo:USOperations0.00.00.02.9

Intangible Assets Net Excluding Goodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill


Intangible
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
Value6060609091919192929393110111107961081081076768707173747678788183848687889091889091939293949596
Percentage of IntangibleAssetsNetExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.60.60.60.80.90.90.90.90.90.91.01.21.21.21.11.21.31.30.91.01.01.11.11.11.21.21.21.31.31.31.31.31.31.41.41.31.41.41.51.41.41.51.51.4

us-gaap:IntangibleAssetsNetExcludingGoodwill us-gaap:StatementBusinessSegments

argo:InternationalOperations


Intangible
Period End2020-12-312019-12-312018-12-312017-12-31
Value60919395
Percentage of IntangibleAssetsNetExcludingGoodwill100.0100.099.598.5
Percentage of Assets0.60.91.01.1
Percentage of Assets argo:InternationalOperations0.00.00.02.7

Intangible Assets Net Including Goodwill

us-gaap:IntangibleAssetsNetIncludingGoodwill

us-gaap:IntangibleAssetsNetIncludingGoodwill


Intangible
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-31
Value207247247252253269269270270271273268258260261259219221222224225226228231230235239
Percentage of IntangibleAssetsNetIncludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.02.32.42.52.42.62.72.72.82.93.02.92.92.93.23.23.13.13.23.33.43.43.53.63.63.73.6

us-gaap:IntangibleAssetsNetIncludingGoodwill dei:LegalEntity

argo:OtherSubsidiariesAndEliminations


Intangible
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value898989898910410410410410510610190
Percentage of IntangibleAssetsNetIncludingGoodwill43.036.136.035.335.238.938.938.838.738.938.837.634.9
Percentage of Assets0.90.80.90.90.81.01.01.11.11.11.21.11.0
Percentage of Assets argo:OtherSubsidiariesAndEliminations2.32.12.22.32.12.52.62.72.83.03.12.92.8

us-gaap:IntangibleAssetsNetIncludingGoodwill us-gaap:ConsolidatedEntities

srt:ParentCompany


Intangible
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value39394040404141
Percentage of IntangibleAssetsNetIncludingGoodwill16.016.115.916.015.215.315.5
Percentage of Assets0.40.40.40.40.40.40.4
Percentage of Assets srt:ParentCompany2.02.02.22.11.91.92.2

srt:SubsidiaryIssuer


Intangible
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value118118118123123123123123
Percentage of IntangibleAssetsNetIncludingGoodwill57.047.947.948.848.745.945.845.8
Percentage of Assets1.11.11.11.21.21.21.21.3
Percentage of Assets srt:SubsidiaryIssuer1.81.81.92.02.02.02.02.1

Deferred Tax Assets Liabilities Net

us-gaap:DeferredTaxAssetsLiabilitiesNet

us-gaap:DeferredTaxAssetsLiabilitiesNet


Deferred
Period End2020-12-312019-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value166.1-53.0-28.7-43.8-26.1-10.56.6
Percentage of DeferredTaxAssetsLiabilitiesNet100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.20.1-0.8-0.4-0.7-0.4-0.20.1

us-gaap:DeferredTaxAssetsLiabilitiesNet us-gaap:IncomeTaxAuthority

us-gaap:ForeignCountry


Deferred
Period End2020-12-312019-12-31
Value216.1
Percentage of DeferredTaxAssetsLiabilitiesNet128.1100.0
Percentage of Assets0.20.1
Percentage of Assets us-gaap:ForeignCountry0.00.0

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OperatingLeaseRightOfUseAsset


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value781078284878991108112115
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.81.00.80.80.80.90.91.01.11.2

us-gaap:OperatingLeaseRightOfUseAsset dei:LegalEntity

argo:OtherSubsidiariesAndEliminations


Operating
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value2424252425283030
Percentage of OperatingLeaseRightOfUseAsset29.429.128.827.527.326.626.826.1
Percentage of Assets0.20.20.20.20.20.30.30.3
Percentage of Assets argo:OtherSubsidiariesAndEliminations0.60.60.60.60.60.70.70.8

us-gaap:OperatingLeaseRightOfUseAsset us-gaap:ConsolidatedEntities

srt:ParentCompany


Operating
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value6.26.56.87.17.17.88.2
Percentage of OperatingLeaseRightOfUseAsset7.67.77.88.07.77.27.3
Percentage of Assets0.10.10.10.10.10.10.1
Percentage of Assets srt:ParentCompany0.30.30.30.40.40.40.4

srt:SubsidiaryIssuer


Operating
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value51535557597174
Percentage of OperatingLeaseRightOfUseAsset63.063.263.464.564.966.265.9
Percentage of Assets0.50.50.50.60.60.70.7
Percentage of Assets srt:SubsidiaryIssuer0.80.80.90.91.01.21.2

Equity Securities Fv Ni

us-gaap:EquitySecuritiesFvNi

us-gaap:EquitySecuritiesFvNi


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value185182176150147132124400421414354
Percentage of EquitySecuritiesFvNi100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.81.81.71.41.41.31.23.84.14.23.7

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
Value3482952943584144353873904384153623914273883093193263032622552622712252252302222261601601701661471591551291291201301059510710786106
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 Assets3.42.92.83.34.04.33.73.74.34.23.84.24.74.23.53.54.03.83.63.63.84.03.43.43.53.53.62.52.52.72.52.22.42.41.92.01.92.11.61.51.61.71.31.5

us-gaap:OtherAssets dei:LegalEntity

argo:OtherSubsidiariesAndEliminations


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value126191258264213209257215181188239193128
Percentage of OtherAssets43.053.562.460.755.253.758.751.950.148.356.049.941.6
Percentage of Assets1.21.82.52.62.02.02.52.21.92.02.62.11.5
Percentage of Assets argo:OtherSubsidiariesAndEliminations3.24.66.56.85.05.06.35.64.95.46.95.54.0

us-gaap:OtherAssets us-gaap:ConsolidatedEntities

srt:ParentCompany


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value148.89.6187.8109.915
Percentage of OtherAssets4.92.52.34.22.02.72.34.3
Percentage of Assets0.10.10.10.20.10.10.10.2
Percentage of Assets srt:ParentCompany0.80.40.51.00.40.50.50.8

srt:SubsidiaryIssuer


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value153157146152165170171165
Percentage of OtherAssets52.144.035.335.142.843.639.145.5
Percentage of Assets1.51.51.41.51.61.61.71.7
Percentage of Assets srt:SubsidiaryIssuer2.42.42.32.42.72.72.82.9

us-gaap:OtherAssets us-gaap:Restatement

srt:RestatementAdjustment


Other
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302018-01-01
Value0.1-0.2-0.60.8-0.10.2
Percentage of OtherAssets0.0-0.0-0.10.2-0.00.0
Percentage of Assets0.0-0.0-0.00.0-0.00.0
Percentage of Assets srt:RestatementAdjustment-0.81.12.6-14.00.90.0

srt:ScenarioPreviouslyReported


Other
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302018-01-01
Value358414435387390309
Percentage of OtherAssets100.0100.0100.0100.0100.00.0
Percentage of Assets3.34.04.33.73.70.0
Percentage of Assets srt:ScenarioPreviouslyReported3.34.04.33.73.70.0

Accrued Income Taxes Current

us-gaap:AccruedIncomeTaxesCurrent

us-gaap:AccruedIncomeTaxesCurrent


Accrued
Period End2021-06-30
Value5300000.0
Percentage of AccruedIncomeTaxesCurrent100.0
Percentage of Assets0.1

Long Term Debt

us-gaap:LongTermDebt

us-gaap:LongTermDebt


Long
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302011-12-31
Value458456578577578578579579580580581582580580578576367369369368371373373374378380403403403402401401400519377
Percentage of LongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.44.35.65.75.55.55.75.86.16.36.46.46.66.47.07.25.15.15.35.45.65.65.75.96.06.06.36.36.16.06.16.16.07.85.9

us-gaap:LongTermDebt dei:LegalEntity

argo:OtherSubsidiariesAndEliminations


Long
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value145144140139141141141141142142143144142
Percentage of LongTermDebt31.831.524.324.224.424.424.424.424.524.524.624.824.6
Percentage of Assets1.41.31.41.41.31.31.41.41.51.51.61.61.6
Percentage of Assets argo:OtherSubsidiariesAndEliminations3.73.53.53.63.33.43.53.73.84.14.14.14.4

us-gaap:LongTermDebt us-gaap:ConsolidatedEntities

srt:ParentCompany


Long
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value2828153153153153153153
Percentage of LongTermDebt6.26.226.526.626.526.526.526.4
Percentage of Assets0.30.31.51.51.51.51.51.6
Percentage of Assets srt:ParentCompany1.51.47.88.27.87.27.28.0

srt:SubsidiaryIssuer


Long
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value284284284284284284284284
Percentage of LongTermDebt62.062.249.149.249.149.149.249.1
Percentage of Assets2.72.62.72.82.72.72.83.0
Percentage of Assets srt:SubsidiaryIssuer4.44.44.54.64.64.64.74.9

us-gaap:LongTermDebt us-gaap:LongtermDebtType

argo:FloatingRateLoanStock


Long
Period End2020-12-31
Value94
Percentage of LongTermDebt20.6
Percentage of Assets0.9
Percentage of Assets argo:FloatingRateLoanStock0.0

argo:SeniorUnsecuredNotes


Long
Period End2020-12-31
Value347
Percentage of LongTermDebt75.6
Percentage of Assets3.3
Percentage of Assets argo:SeniorUnsecuredNotes0.0

us-gaap:JuniorSubordinatedDebt


Long
Period End2020-12-312015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value411172172172172193193193193
Percentage of LongTermDebt89.646.346.245.645.347.947.947.948.2
Percentage of Assets3.92.62.72.72.73.03.02.92.9
Percentage of Assets us-gaap:JuniorSubordinatedDebt0.00.00.00.00.00.00.00.00.0

Lessee Operating Lease Liability Payments Due Year Two

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo


Lessee
Period End2020-12-31
Value13
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
Value11
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
Value9800000.0
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
Value9600000.0
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
Value58
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive100.0
Percentage of Assets0.6

Operating Lease Liability

us-gaap:OperatingLeaseLiability

us-gaap:OperatingLeaseLiability


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value931279598991011051201251280.0
Percentage of OperatingLeaseLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets0.91.20.90.91.01.01.01.21.21.30.0

us-gaap:OperatingLeaseLiability dei:LegalEntity

argo:OtherSubsidiariesAndEliminations


Operating
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value2929282729303332
Percentage of OperatingLeaseLiability30.530.328.427.427.925.526.425.4
Percentage of Assets0.30.30.30.30.30.30.30.3
Percentage of Assets argo:OtherSubsidiariesAndEliminations0.70.70.70.70.70.70.80.8

us-gaap:OperatingLeaseLiability us-gaap:ConsolidatedEntities

srt:ParentCompany


Operating
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value6.26.66.97.37.38.08.9
Percentage of OperatingLeaseLiability6.56.77.07.26.96.77.1
Percentage of Assets0.10.10.10.10.10.10.1
Percentage of Assets srt:ParentCompany0.30.30.40.40.40.40.4

srt:SubsidiaryIssuer


Operating
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value60616466688183
Percentage of OperatingLeaseLiability63.063.064.665.565.267.866.5
Percentage of Assets0.60.60.60.70.70.80.8
Percentage of Assets srt:SubsidiaryIssuer0.91.01.01.11.11.31.4

Lessee Operating Lease Liability Payments Due

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue


Lessee
Period End2020-12-31
Value116
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue100.0
Percentage of Assets1.1

Lessee Operating Lease Liability Undiscounted Excess Amount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount


Lessee
Period End2020-12-31
Value21
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount100.0
Percentage of Assets0.2

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value1897182118571864173016361781189319291880174618181797178718191808189118341792178817401705166816411668166216461626163315941563152714911546151415411493150614791466154815201626161413521384
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets18.317.617.817.416.616.016.918.119.018.918.319.619.719.620.820.023.022.924.924.925.025.025.224.825.526.125.925.525.424.823.723.022.723.422.623.223.523.823.122.523.824.025.123.40.00.0

us-gaap:StockholdersEquity dei:LegalEntity

argo:OtherSubsidiariesAndEliminations


Stockholders
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value567578599639724810857844795790792835849
Percentage of StockholdersEquity30.631.034.639.140.642.844.544.945.543.544.146.846.7
Percentage of Assets5.45.45.86.36.97.88.48.58.38.58.79.19.7
Percentage of Assets argo:OtherSubsidiariesAndEliminations14.413.915.016.417.019.421.121.721.422.822.823.726.3

us-gaap:StockholdersEquity us-gaap:ConsolidatedEntities

srt:ParentCompany


Stockholders
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value18571864173016361781189319291746
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets17.817.416.616.016.918.119.018.3
Percentage of Assets srt:ParentCompany97.593.688.187.890.289.590.291.2

srt:SubsidiaryIssuer


Stockholders
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value13061265123710991173119211861049
Percentage of StockholdersEquity70.367.971.567.265.963.061.560.1
Percentage of Assets12.511.811.910.811.211.411.711.0
Percentage of Assets srt:SubsidiaryIssuer20.119.519.517.618.919.219.618.1

us-gaap:StockholdersEquity us-gaap:ConsolidationItems

srt:ConsolidationEliminations


Stockholders
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value-1874.4-1844.5-1836.9-1738.8-1897.4-2003.1-2044.3-1844.2
Percentage of StockholdersEquity-100.9-98.9-106.2-106.2-106.5-105.8-106.0-105.6
Percentage of Assets-17.9-17.2-17.7-17.0-18.0-19.2-20.1-19.3
Percentage of Assets srt:ConsolidationEliminations99.695.596.596.899.097.598.499.5

us-gaap:StockholdersEquity us-gaap:Restatement

srt:RestatementAdjustment


Stockholders
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-15.8-22.3-23.3-17.4-18.0-17.1-15.3
Percentage of StockholdersEquity-0.8-1.3-1.4-1.0-1.0-0.9-0.8
Percentage of Assets-0.1-0.2-0.2-0.2-0.2-0.2-0.2
Percentage of Assets srt:RestatementAdjustment125.4121.299.6305.3157.9128.6131.9

srt:ScenarioPreviouslyReported


Stockholders
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1864173016361781189319291880
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets17.416.616.016.918.119.018.9
Percentage of Assets srt:ScenarioPreviouslyReported17.416.616.016.918.119.018.9

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value-7.1-8.6-8.6-8.1-8.1-8.1-8.1-6.7-6.7-6.7-6.7-7.7-7.7-6.3-6.3-7.1-7.1-7.1
Percentage of StockholdersEquity-0.4-0.5-0.5-0.4-0.5-0.5-0.5-0.4-0.3-0.4-0.4-0.4-0.4-0.4-0.3-0.4-0.4-0.4
Percentage of Assets-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value65511057944-67.83333381.3-49.0-26.6-23.2-5.612112110572
Percentage of StockholdersEquity3.52.85.74.32.6-4.11.91.82.00.1-2.8-1.5-1.3-0.36.76.75.64.0
Percentage of Assets0.60.51.00.70.4-0.70.30.30.40.0-0.5-0.3-0.3-0.11.41.31.31.0
Percentage of Assets us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-31
Value234.258365.9-101.92.84.78.9-27.6-78.1-58.1-53.9-32.0969780614711108147189139147107-22.275
Percentage of StockholdersEquity1.20.23.22.00.3-6.20.20.20.5-1.5-4.5-3.2-3.0-1.85.35.44.23.42.70.76.69.512.59.59.16.7-1.65.5
Percentage of Assets0.20.00.60.30.1-1.00.00.00.1-0.3-0.8-0.6-0.6-0.41.11.11.00.80.70.21.72.22.82.22.31.60.00.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value-35.4-38.8-37.9-34.9-30.2-26.0-22.6-22.5-22.5-22.2-22.4-23.8-23.0-20.1-19.0-17.8-18.2-17.6
Percentage of StockholdersEquity-1.9-2.1-2.0-1.9-1.7-1.6-1.3-1.2-1.2-1.2-1.3-1.3-1.3-1.1-1.0-1.0-1.0-1.0
Percentage of Assets-0.3-0.4-0.4-0.3-0.3-0.3-0.2-0.2-0.2-0.2-0.2-0.3-0.3-0.2-0.2-0.2-0.2-0.2
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-31
Value1383138113801378137613741376137313691374137213681365136411291129112511221123964836827722716711702694685
Percentage of StockholdersEquity72.975.974.373.979.684.077.372.571.073.178.575.376.076.462.062.559.561.262.757.850.852.947.748.543.743.551.349.5
Percentage of Assets13.313.313.212.813.213.513.113.113.513.814.414.715.014.912.912.513.714.015.614.613.212.610.811.211.010.20.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-31
Value46464646464545454545454545444040404040373434313131313030
Percentage of StockholdersEquity2.42.52.52.52.72.82.62.42.42.42.62.52.52.52.22.22.12.22.22.22.12.22.12.11.91.92.32.2
Percentage of Assets0.40.40.40.40.40.40.40.40.40.50.50.50.50.50.50.40.50.50.60.60.50.50.50.50.50.40.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-31
Value7567006847147567738119259599438629158848519779561026988959985969804776752847779655592
Percentage of StockholdersEquity39.938.536.838.343.747.345.548.949.850.149.450.449.247.753.752.954.253.953.559.158.951.551.350.852.148.348.442.8
Percentage of Assets7.36.86.56.77.37.67.78.99.49.59.09.99.79.311.110.612.512.313.314.915.312.211.611.713.111.30.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-312007-12-31
Value-455.1-455.1-455.1-455.1-455.1-455.1-455.1-455.1-455.1-455.1-455.1-453.4-443.8-442.0-423.4-414.8-381.0-378.2-378.2-331.1-301.4-250.6-205.5-160.9-111.6-5.1-5.10.0
Percentage of StockholdersEquity-24.0-25.0-24.5-24.4-26.3-27.8-25.6-24.0-23.6-24.2-26.1-24.9-24.7-24.7-23.3-22.9-20.1-20.6-21.1-19.8-18.3-16.0-13.6-10.9-6.9-0.3-0.40.0
Percentage of Assets-4.4-4.4-4.3-4.2-4.4-4.5-4.3-4.4-4.5-4.6-4.8-4.9-4.9-4.8-4.8-4.6-4.6-4.7-5.2-5.0-4.7-3.8-3.1-2.5-1.7-0.10.00.0
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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
Value4646464646454545454545454544404040404040393737373736343434343434343131313131313131313131
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 Assets0.40.40.40.40.40.40.40.40.40.50.50.50.50.50.50.40.50.50.60.60.60.50.60.60.60.60.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.4

Additional Paid In Capital Common Stock

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:AdditionalPaidInCapitalCommonStock


Additional
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value138313811380137813761374137613731369137413721368136513641129112911251122112311191117970964961960960836834832829827825823725722721719718716715714713711702
Percentage of AdditionalPaidInCapitalCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets13.313.313.212.813.213.513.113.113.513.814.414.715.014.912.912.513.714.015.615.616.014.214.614.514.715.113.213.113.012.912.612.412.511.010.810.811.311.311.211.011.011.311.010.2

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
Value75670068471475677381192595994386291588485197795610269889599338851007985950920898969914874840804760733804776783773752752753769749847779
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 Assets7.36.86.56.77.37.67.78.99.49.59.09.99.79.311.110.612.512.313.313.012.714.814.914.314.114.115.314.313.613.112.211.411.212.211.611.812.211.911.711.611.811.813.111.3

us-gaap:RetainedEarningsAccumulatedDeficit us-gaap:Restatement

srt:RestatementAdjustment


Retained
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312019-01-012018-01-01
Value-15.8-22.3-23.3-17.4-18.0-17.1-15.3-11.7-6.8
Percentage of RetainedEarningsAccumulatedDeficit-2.2-2.9-3.0-2.1-1.9-1.8-1.60.00.0
Percentage of Assets-0.1-0.2-0.2-0.2-0.2-0.2-0.20.00.0
Percentage of Assets srt:RestatementAdjustment125.4121.299.6305.3157.9128.6131.90.00.0

srt:ScenarioPreviouslyReported


Retained
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312019-01-012018-01-01
Value714756773811925959943862977
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.00.00.0
Percentage of Assets6.77.37.67.78.99.49.50.00.0
Percentage of Assets srt:ScenarioPreviouslyReported6.77.37.67.78.99.49.50.00.0

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
Value234.258365.9-101.92.84.78.9-27.6-78.1-58.1-53.9-32.0969780614771694011237786108136174148147151135202189204157175139114165155147107
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 Assets0.20.00.60.30.1-1.00.00.00.1-0.3-0.8-0.6-0.6-0.41.11.11.00.80.71.01.00.60.20.41.21.41.72.12.72.32.22.32.13.12.83.12.52.82.21.82.52.52.31.6

Treasury Stock Value

us-gaap:TreasuryStockValue

us-gaap:TreasuryStockValue


Treasury
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
Value4554554554554554554554554554554554534434424234143813783783763713503313313263193012922822582502442352172051981881701601481311281115.1
Percentage of TreasuryStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.44.44.34.24.44.54.34.44.54.64.84.94.94.84.84.64.64.75.25.25.35.15.05.05.05.04.74.64.44.03.83.73.63.33.13.03.02.72.52.32.02.01.70.1

Stock Issued During Period Value New Issues

us-gaap:StockIssuedDuringPeriodValueNewIssues

us-gaap:StockIssuedDuringPeriodValueNewIssues


Stock
Period End2020-12-312020-09-30
Value0.0144
Percentage of StockIssuedDuringPeriodValueNewIssues0.0100.0
Percentage of Assets0.00.0

us-gaap:StockIssuedDuringPeriodValueNewIssues us-gaap:StatementEquityComponents

us-gaap:PreferredStock


Stock
Period End2020-12-312020-09-30
Value0.0144
Percentage of StockIssuedDuringPeriodValueNewIssues0.0100.0
Percentage of Assets0.00.0
Percentage of Assets us-gaap:PreferredStock0.00.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-82.770-29.5204-71.7-31.4-12.4200-60.55570105-27.7153-87.4-19.7514614167275895-67.1432.893-12.2-84.0-33.091-22.4-6.0-82.8637.6-5.6-32.675-5.7-40.6
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-15.113.4-5.742.3-15.7-7.2-2.641.2-12.410.917.521.1-6.035.1-19.2-5.113.812.738.018.07.414.325.6-17.912.10.725.6-3.4-24.6-9.426.7-7.0-1.9-26.020.82.3-1.9-10.322.7-1.6-10.9

us-gaap:NetCashProvidedByUsedInOperatingActivities dei:LegalEntity

argo:OtherSubsidiariesAndEliminations


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value-74.3144-25.3-77.1-21.360-36.01724-15.9-70.6
Percentage of NetCashProvidedByUsedInOperatingActivities251.970.835.3245.5171.830.259.531.134.9-15.180.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-14.429.9-5.5-17.7-4.412.4-7.43.46.1-3.2-15.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax argo:OtherSubsidiariesAndEliminations0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetCashProvidedByUsedInOperatingActivities us-gaap:ConsolidatedEntities

srt:ParentCompany


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-30.6151010.09.29.9108.81418
Percentage of NetCashProvidedByUsedInOperatingActivities103.77.5-14.4-31.8-74.24.9-17.415.820.917.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-5.93.22.32.31.92.02.11.73.73.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:ParentCompany0.00.00.00.00.00.00.00.00.00.0

srt:SubsidiaryIssuer


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value7544-56.735-0.3130-35.02931102
Percentage of NetCashProvidedByUsedInOperatingActivities-255.621.879.1-113.72.464.957.953.144.297.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax14.69.2-12.48.2-0.126.7-7.25.87.720.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:SubsidiaryIssuer0.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value129-50.0-105.0-95.11146116-229.5102-31.7-35.0-95.5-9.3-128.54445-25.5-17.6-144.1-34.02.1-34.6-126.284-45.021-40.74594109-151.6317.17930-58.14889-32.03195
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax23.6-9.5-20.3-19.725.114.03.4-47.120.9-6.2-8.7-19.1-2.0-29.49.811.9-6.9-4.8-38.7-9.10.6-8.4-34.022.5-12.55.4-11.212.427.731.2-44.09.82.224.810.1-17.316.428.3-9.68.625.6

us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity

argo:OtherSubsidiariesAndEliminations


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value56-142.1568728-115.571-24.82.510.096
Percentage of NetCashProvidedByUsedInInvestingActivities-53.3149.449.7143.4170.750.369.878.2-7.1-10.5215.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.8-29.412.520.15.8-23.714.6-4.90.62.021.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax argo:OtherSubsidiariesAndEliminations0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetCashProvidedByUsedInInvestingActivities us-gaap:ConsolidatedEntities

srt:ParentCompany


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value43-145.8-0.30.3-0.40.70.81.9-4.11.3
Percentage of NetCashProvidedByUsedInInvestingActivities-41.6153.3-0.30.5-2.4-0.30.8-6.011.7-1.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.5-30.2-0.10.1-0.10.10.20.4-1.00.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:ParentCompany0.00.00.00.00.00.00.00.00.00.0

srt:SubsidiaryIssuer


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-191.64757-26.9-11.2-114.730-8.8-33.4-106.8
Percentage of NetCashProvidedByUsedInInvestingActivities182.5-49.950.6-43.9-68.350.029.427.895.4111.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-37.19.812.7-6.2-2.3-23.56.1-1.7-8.3-21.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:SubsidiaryIssuer0.00.00.00.00.00.00.00.00.00.0

us-gaap:NetCashProvidedByUsedInInvestingActivities us-gaap:ConsolidationItems

srt:ConsolidationEliminations


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-13.1000000000000161450.00.00.00.00.00.00.00.0
Percentage of NetCashProvidedByUsedInInvestingActivities12.5-152.80.00.00.0-0.00.0-0.0-0.0-0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2.530.10.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:ConsolidationEliminations0.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-13.3-13.1-13.06.5-9.9-10.4-10.1-9.9-11.3-10.5-10.6-19.1-10.2-27.7-16.4-28.1-24.7-5.3-7.3-15.6-21.8-13.4-31.4-30.8-6.8-9.2-13.1-21.9-15.3-125.8125-21.4-12.4-16.5-18.0-6.0-21.1-39.7-47.45.0-33.3
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2.4-2.5-2.51.3-2.2-2.4-2.1-2.0-2.3-2.1-2.6-3.8-2.2-6.3-3.6-7.3-6.7-1.4-2.0-4.2-5.9-3.3-8.5-8.2-1.9-2.3-3.6-6.0-4.5-35.936.5-6.7-3.8-5.2-5.9-1.8-7.1-12.5-14.21.4-8.9

us-gaap:NetCashProvidedByUsedInFinancingActivities dei:LegalEntity

argo:OtherSubsidiariesAndEliminations


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value-13.1200.00.00.00.00.0190.0-19.0-60.0
Percentage of NetCashProvidedByUsedInFinancingActivities100.8312.3-0.0-0.0-0.0-0.0-0.0-181.9-0.099.5365.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2.54.20.00.00.00.00.03.80.0-3.8-13.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax argo:OtherSubsidiariesAndEliminations0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetCashProvidedByUsedInFinancingActivities us-gaap:ConsolidatedEntities

srt:ParentCompany


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-13.0131-9.9-10.4-10.1-9.3-11.3-10.5-10.6-19.1
Percentage of NetCashProvidedByUsedInFinancingActivities100.02023.1100.0100.0100.093.9100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2.527.2-2.2-2.4-2.1-1.9-2.3-2.1-2.6-3.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:ParentCompany0.00.00.00.00.00.00.00.00.00.0

us-gaap:NetCashProvidedByUsedInFinancingActivities us-gaap:ConsolidationItems

srt:ConsolidationEliminations


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value13-145.30.00.00.00.00.00.00.00.0
Percentage of NetCashProvidedByUsedInFinancingActivities-100.8-2235.4-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.5-30.10.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:ConsolidationEliminations0.00.00.00.00.00.00.00.00.00.0

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
Value347.9-151.61122920-7.3-37.2291320-8.2
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.21.5-29.323.36.34.8-1.5-7.66.12.75.1-1.6

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect dei:LegalEntity

argo:OtherSubsidiariesAndEliminations


Cash
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-35.51927125.5-53.3341123-23.6
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect23.417.595.558.4-75.3143.3116.986.7111.1287.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-6.94.16.12.81.1-10.97.12.35.7-4.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax argo:OtherSubsidiariesAndEliminations0.00.00.00.00.00.00.00.00.00.0

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect us-gaap:ConsolidatedEntities

srt:ParentCompany


Cash
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value0.11.00.1-0.1-1.31.30.00.20.00.7
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect-0.10.90.3-0.517.8-3.50.01.50.0-8.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.20.0-0.0-0.30.30.00.00.00.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:ParentCompany0.00.00.00.00.00.00.00.00.00.0

srt:SubsidiaryIssuer


Cash
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-116.2921.28.8-11.514-5.01.6-2.314
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect76.681.64.142.1157.5-39.8-16.911.9-11.1-179.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-22.519.00.32.0-2.43.0-1.00.3-0.62.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:SubsidiaryIssuer0.00.00.00.00.00.00.00.00.00.0

Deferred Income Tax Expense Benefit

us-gaap:DeferredIncomeTaxExpenseBenefit

us-gaap:DeferredIncomeTaxExpenseBenefit


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
Value-7.10.31.6-4.81.4-19.8-24.3-5.4-2.15.3-5.2-0.5-3.2-3.7-11.5-1.7-10.76.0-3.4-3.82.23.9-5.512-2.23.84.7183.21.1-0.6-1.63.03.02.4-1.4-0.94.90.13.49.0-2.8-1.6-4.5-1.10.9
Percentage of DeferredIncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Increase Decrease In Other Operating Capital Net

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-2.60000000000000219-14.7-29.6191437-22.02538-28.146-60.3-71.6-15.9-16.5131914-0.6341.3-0.7-3.210-6.8-3.80.0-38.614-2.76.247-28.94.66.6-1.91.40.6-9.7-0.228-4.6-3.7-31.557
Percentage of IncreaseDecreaseInOtherOperatingCapitalNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-82.770-29.5204-71.7-31.4-12.4200-60.55570105-27.7153-87.4-19.7514614167275895-67.1432.893-12.2-84.0-33.091-22.4-6.0-82.8637.6-5.6-32.675-5.7-40.6
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-15.113.4-5.742.3-15.7-7.2-2.641.2-12.410.917.521.1-6.035.1-19.2-5.113.812.738.018.07.414.325.6-17.912.10.725.6-3.4-24.6-9.426.7-7.0-1.9-26.020.82.3-1.9-10.322.7-1.6-10.9

us-gaap:NetCashProvidedByUsedInOperatingActivities dei:LegalEntity

argo:OtherSubsidiariesAndEliminations


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value-74.3144-25.3-77.1-21.360-36.01724-15.9-70.6
Percentage of NetCashProvidedByUsedInOperatingActivities251.970.835.3245.5171.830.259.531.134.9-15.180.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-14.429.9-5.5-17.7-4.412.4-7.43.46.1-3.2-15.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax argo:OtherSubsidiariesAndEliminations0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetCashProvidedByUsedInOperatingActivities us-gaap:ConsolidatedEntities

srt:ParentCompany


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-30.6151010.09.29.9108.81418
Percentage of NetCashProvidedByUsedInOperatingActivities103.77.5-14.4-31.8-74.24.9-17.415.820.917.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-5.93.22.32.31.92.02.11.73.73.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:ParentCompany0.00.00.00.00.00.00.00.00.00.0

srt:SubsidiaryIssuer


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value7544-56.735-0.3130-35.02931102
Percentage of NetCashProvidedByUsedInOperatingActivities-255.621.879.1-113.72.464.957.953.144.297.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax14.69.2-12.48.2-0.126.7-7.25.87.720.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:SubsidiaryIssuer0.00.00.00.00.00.00.00.00.00.0

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value69290.7-29.6-6.4-18.8-103.3-25.12891-43.640412428-61.3463632553027413527585944384047313132-4.71324191.4-12.122-94.512232620
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax12.75.70.1-6.1-1.4-4.3-21.3-5.15.917.9-10.88.19.05.76.3-14.010.28.68.113.28.07.511.29.57.515.814.512.010.311.211.98.58.79.6-1.33.97.56.10.4-4.06.8-31.84.06.97.25.6

us-gaap:NetIncomeLoss dei:LegalEntity

argo:OtherSubsidiariesAndEliminations


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-16.3-25.4-51.4-4.1-67.8-26.620354016-21.6343.2-53.02428
Percentage of NetIncomeLoss-2328.685.8803.121.865.6106.070.538.4-92.440.4-51.7140.311.186.553.978.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-3.2-5.3-11.2-0.9-14.0-5.54.26.910.03.3-4.78.00.7-12.15.56.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax argo:OtherSubsidiariesAndEliminations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:ConsolidatedEntities

srt:ParentCompany


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value0.7-29.6-6.4-18.8-103.3-25.12891-43.64041
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.1-6.1-1.4-4.3-21.3-5.15.917.9-10.88.19.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:ParentCompany0.00.00.00.00.00.00.00.00.00.00.0

srt:SubsidiaryIssuer


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value321.350-4.8-16.56.41959-81.73071
Percentage of NetIncomeLoss4685.7-4.4-789.125.516.0-25.566.365.1187.473.9169.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.30.311.1-1.1-3.41.33.911.7-20.36.015.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:SubsidiaryIssuer0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:ConsolidationItems

srt:ConsolidationEliminations


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-16.5240.98.98420-39.4-94.441-46.4-49.4
Percentage of NetIncomeLoss-2357.1-81.4-14.1-47.3-81.6-80.5-136.8-103.5-95.0-114.3-118.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-3.25.00.22.017.44.1-8.1-18.510.3-9.3-10.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:ConsolidationEliminations0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:Restatement

srt:RestatementAdjustment


Net
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value6.51.0-5.90.6-0.9-1.8-3.6
Percentage of NetIncomeLoss-22.0-15.631.4-0.63.6-6.2-3.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.30.2-1.40.1-0.2-0.4-0.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:RestatementAdjustment0.00.00.00.00.00.00.0

srt:ScenarioPreviouslyReported


Net
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-29.6-6.4-18.8-103.3-25.12891
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-6.1-1.4-4.3-21.3-5.15.917.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:ScenarioPreviouslyReported0.00.00.00.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value69290.7-29.6-6.4-18.8-103.3-25.12891-43.640412428-61.34636
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax12.75.70.1-6.1-1.4-4.3-21.3-5.15.917.9-10.88.19.05.76.3-14.010.28.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Share Based Compensation

us-gaap:ShareBasedCompensation

us-gaap:ShareBasedCompensation


Share
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
Value2.22.31.02.32.52.95.22.94.24.63.93.45.85.21.13.62.74.98.75.52.63.08.35.57.75.26.32.26.84.45.53.26.08.62.63.91.42.62.11.10.80.63.42.41.92.4
Percentage of ShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value129-50.0-105.0-95.11146116-229.5102-31.7-35.0-95.5-9.3-128.54445-25.5-17.6-144.1-34.02.1-34.6-126.284-45.021-40.74594109-151.6317.17930-58.14889-32.03195
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax23.6-9.5-20.3-19.725.114.03.4-47.120.9-6.2-8.7-19.1-2.0-29.49.811.9-6.9-4.8-38.7-9.10.6-8.4-34.022.5-12.55.4-11.212.427.731.2-44.09.82.224.810.1-17.316.428.3-9.68.625.6

us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity

argo:OtherSubsidiariesAndEliminations


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value56-142.1568728-115.571-24.82.510.096
Percentage of NetCashProvidedByUsedInInvestingActivities-53.3149.449.7143.4170.750.369.878.2-7.1-10.5215.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.8-29.412.520.15.8-23.714.6-4.90.62.021.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax argo:OtherSubsidiariesAndEliminations0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetCashProvidedByUsedInInvestingActivities us-gaap:ConsolidatedEntities

srt:ParentCompany


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value43-145.8-0.30.3-0.40.70.81.9-4.11.3
Percentage of NetCashProvidedByUsedInInvestingActivities-41.6153.3-0.30.5-2.4-0.30.8-6.011.7-1.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.5-30.2-0.10.1-0.10.10.20.4-1.00.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:ParentCompany0.00.00.00.00.00.00.00.00.00.0

srt:SubsidiaryIssuer


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-191.64757-26.9-11.2-114.730-8.8-33.4-106.8
Percentage of NetCashProvidedByUsedInInvestingActivities182.5-49.950.6-43.9-68.350.029.427.895.4111.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-37.19.812.7-6.2-2.3-23.56.1-1.7-8.3-21.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:SubsidiaryIssuer0.00.00.00.00.00.00.00.00.00.0

us-gaap:NetCashProvidedByUsedInInvestingActivities us-gaap:ConsolidationItems

srt:ConsolidationEliminations


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-13.1000000000000161450.00.00.00.00.00.00.00.0
Percentage of NetCashProvidedByUsedInInvestingActivities12.5-152.80.00.00.0-0.00.0-0.0-0.0-0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2.530.10.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:ConsolidationEliminations0.00.00.00.00.00.00.00.00.00.0

Payments To Acquire Property Plant And Equipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment


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
Value5.67.74.48.25.32.37.07.28.47.3-3.6244.66.410105.14.95.44.0156.8-3.17.6-3.417127.8126.07.06.18.84.27.27.710.09.25.85.04.01.72.84.63.33.9
Percentage of PaymentsToAcquirePropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Payments To Acquire Investments

us-gaap:PaymentsToAcquireInvestments

us-gaap:PaymentsToAcquireInvestments


Payments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value400574328849344680574384171603686687600594821644524600797458565451460557472498458307568481483442370384358508468
Percentage of PaymentsToAcquireInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireInvestments dei:LegalEntity

argo:OtherSubsidiariesAndEliminations


Payments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value70215-23.826613127513713510193224212245264457197
Percentage of PaymentsToAcquireInvestments17.637.5-7.331.338.340.523.935.26.132.132.730.940.944.555.630.7

us-gaap:PaymentsToAcquireInvestments us-gaap:ConsolidatedEntities

srt:SubsidiaryIssuer


Payments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value329359352583212404437249161409
Percentage of PaymentsToAcquireInvestments82.462.5107.368.761.759.576.164.893.967.9

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-13.3-13.1-13.06.5-9.9-10.4-10.1-9.9-11.3-10.5-10.6-19.1-10.2-27.7-16.4-28.1-24.7-5.3-7.3-15.6-21.8-13.4-31.4-30.8-6.8-9.2-13.1-21.9-15.3-125.8125-21.4-12.4-16.5-18.0-6.0-21.1-39.7-47.45.0-33.3
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2.4-2.5-2.51.3-2.2-2.4-2.1-2.0-2.3-2.1-2.6-3.8-2.2-6.3-3.6-7.3-6.7-1.4-2.0-4.2-5.9-3.3-8.5-8.2-1.9-2.3-3.6-6.0-4.5-35.936.5-6.7-3.8-5.2-5.9-1.8-7.1-12.5-14.21.4-8.9

us-gaap:NetCashProvidedByUsedInFinancingActivities dei:LegalEntity

argo:OtherSubsidiariesAndEliminations


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value-13.1200.00.00.00.00.0190.0-19.0-60.0
Percentage of NetCashProvidedByUsedInFinancingActivities100.8312.3-0.0-0.0-0.0-0.0-0.0-181.9-0.099.5365.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2.54.20.00.00.00.00.03.80.0-3.8-13.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax argo:OtherSubsidiariesAndEliminations0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetCashProvidedByUsedInFinancingActivities us-gaap:ConsolidatedEntities

srt:ParentCompany


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-13.0131-9.9-10.4-10.1-9.3-11.3-10.5-10.6-19.1
Percentage of NetCashProvidedByUsedInFinancingActivities100.02023.1100.0100.0100.093.9100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2.527.2-2.2-2.4-2.1-1.9-2.3-2.1-2.6-3.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:ParentCompany0.00.00.00.00.00.00.00.00.00.0

us-gaap:NetCashProvidedByUsedInFinancingActivities us-gaap:ConsolidationItems

srt:ConsolidationEliminations


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value13-145.30.00.00.00.00.00.00.00.0
Percentage of NetCashProvidedByUsedInFinancingActivities-100.8-2235.4-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.5-30.10.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:ConsolidationEliminations0.00.00.00.00.00.00.00.00.00.0

Payments Of Dividends

us-gaap:PaymentsOfDividends

us-gaap:PaymentsOfDividends


Payments
Period End2021-06-042021-03-122020-06-122020-03-16
Value11101010
Percentage of PaymentsOfDividends100.0100.0100.0100.0

us-gaap:PaymentsOfDividends us-gaap:StatementClassOfStock

us-gaap:SeriesAPreferredStock


Payments
Period End2021-06-152021-03-152020-09-15
Value2.72.62.0
Percentage of PaymentsOfDividends0.00.00.0

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
Value111010101010109.811109.59.39.49.38.38.38.38.36.86.76.96.25.65.95.55.74.84.74.74.04.04.04.13.73.03.13.13.13.13.33.33.43.43.53.63.7
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

us-gaap:PaymentsOfDividendsCommonStock us-gaap:ConsolidatedEntities

srt:ParentCompany


Payments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value10101010109.811109.59.3
Percentage of PaymentsOfDividendsCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Effective Income Tax Rate Continuing Operations

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:EffectiveIncomeTaxRateContinuingOperations


Effective
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value11.34.34.4-0.72.0940.128-0.0840.0410.0290.089-0.0970.1020.2690.007-0.4840.070.0940.14100.1130.2210.1620
Percentage of EffectiveIncomeTaxRateContinuingOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.0

us-gaap:EffectiveIncomeTaxRateContinuingOperations us-gaap:StatementGeographical

country:BE


Effective
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value5.422.80.20.688-0.1360.2860.2950.308-0.3330.3080.3640.3580.3880.3610.36600.232-1.60.16302.8750.3140.165-0.0480.962-0.0790.6420.1810.7610.916-0.390.6760.6480.21.3830.2780.0530.2550.0630.173
Percentage of EffectiveIncomeTaxRateContinuingOperations122.7-3257.19.6537.5161.9697.61017.2346.1343.3302.0135.35114.3-80.2515.7389.40.00.0-1415.973.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

country:GB


Effective
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value-54.628.15.815.40.1281.832-0.0130.1310.2670.3150.065-0.050.1010.245-0.0290.1640.5280.0670.031-0.03-0.0570.0150.167-0.585-0.469-0.2190.0770.154-0.194-0.0770.028-1.6470.2590.2550.00412.1740.0070.310.0740.1160.10.183
Percentage of EffectiveIncomeTaxRateContinuingOperations-483.2653.5131.8-2200.06.11431.215.5319.5920.7353.9-67.0-49.037.53500.06.0234.3561.747.50.0-26.5-25.89.30.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

country:US


Effective
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value21.915.7-2.081.60.2320.550.0510.1640.1480.144-0.2110.1340.1710.23-0.250.5290.2330.2690.0290.2420.3090.237-0.0250.1960.270.2020.0720.1620.2410.2060.0470.2290.2670.183-0.0150.210.0970.2790.0050.3640.260.231
Percentage of EffectiveIncomeTaxRateContinuingOperations193.8365.1-45.5-11657.111.1429.7-60.7400.0510.3161.8217.5131.463.63285.751.7755.7247.9190.80.0214.2139.8146.30.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice

argo:StockSettledSARsActivity


Share
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value37.8535.9836.2136.2635.0533.633.6833.4633.7733.8833.1732.531.1330.85
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Liabilities

us-gaap:DeferredTaxLiabilities us-gaap:IncomeTaxAuthority

us-gaap:DeferredTaxLiabilities

us-gaap:DomesticCountry


Deferred
Period End2020-12-312018-12-312017-12-31
Value4.75.632
Percentage of DeferredTaxLiabilities100.0100.0100.0

Unrecognized Tax Benefits

us-gaap:UnrecognizedTaxBenefits

us-gaap:UnrecognizedTaxBenefits


Unrecognized
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-31
Value8200000.02700000.000000000000000000000000000000000
Percentage of UnrecognizedTaxBenefits100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Deferred Tax Assets Valuation Allowance

us-gaap:DeferredTaxAssetsValuationAllowance

us-gaap:DeferredTaxAssetsValuationAllowance


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value282829202525262323242322222423252627275652504949
Percentage of DeferredTaxAssetsValuationAllowance100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

argo:DebtSecuritiesAvailableForSaleAllowanceForCreditLossAdditionalPeriodIncreaseDecrease

argo:DebtSecuritiesAvailableForSaleAllowanceForCreditLossAdditionalPeriodIncreaseDecrease


Debt
Period End2021-06-302021-03-312020-12-31
Value-0.2-1.1-4.4
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossAdditionalPeriodIncreaseDecrease100.0100.0100.0

argo:DebtSecuritiesAvailableForSaleAllowanceForCreditLossAdditionalPeriodIncreaseDecrease us-gaap:InvestmentType

us-gaap:AssetBackedSecurities


Debt
Period End2021-06-302021-03-312020-12-31
Value0.0-0.2-0.8
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossAdditionalPeriodIncreaseDecrease-0.018.218.2

us-gaap:CorporateBondSecurities


Debt
Period End2021-06-302021-03-312020-12-31
Value-0.3-0.7-3.5
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossAdditionalPeriodIncreaseDecrease150.063.679.5

us-gaap:ForeignGovernmentDebtSecurities


Debt
Period End2021-03-312020-12-31
Value-0.10.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossAdditionalPeriodIncreaseDecrease9.1-0.0

us-gaap:USStatesAndPoliticalSubdivisions


Debt
Period End2021-06-302021-03-312020-12-31
Value0.0-0.1-0.1
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossAdditionalPeriodIncreaseDecrease-0.09.12.3

argo:DepositarySharesDividendsPerShareDeclared

argo:DepositarySharesDividendsPerShareDeclared


Depositary
Period End2021-05-062021-02-122020-08-07
Value0.43750.43750.33056
Percentage of DepositarySharesDividendsPerShareDeclared100.0100.0100.0

argo:DisposalGroupNotDiscontinuedOperationGainLossOnDisposalAdjustmentInCurrentPeriod us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

argo:DisposalGroupNotDiscontinuedOperationGainLossOnDisposalAdjustmentInCurrentPeriod

us-gaap:DisposalGroupDisposedOfBySaleNotDiscontinuedOperations, argo:TridentPublicRiskSolutions


Disposal
Period End2021-06-30
Value-16500000.0
Percentage of DisposalGroupNotDiscontinuedOperationGainLossOnDisposalAdjustmentInCurrentPeriod100.0

argo:EquityInUndistributedNetIncomeLossOfSubsidiaries us-gaap:ConsolidatedEntities

argo:EquityInUndistributedNetIncomeLossOfSubsidiaries

srt:ParentCompany


Equity
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value16-24.1-0.9-8.9-136.4-20.23994-80.64649
Percentage of EquityInUndistributedNetIncomeLossOfSubsidiaries100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

argo:EquityInUndistributedNetIncomeLossOfSubsidiaries us-gaap:ConsolidationItems

srt:ConsolidationEliminations


Equity
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-16.5240.98.913620-39.4-94.480-46.4-49.4
Percentage of EquityInUndistributedNetIncomeLossOfSubsidiaries-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0

argo:FeeAndOtherExpense

argo:FeeAndOtherExpense


Fee
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-0.80.10.90.91.01.22.01.21.31.31.61.91.62.02.25.03.34.1
Percentage of FeeAndOtherExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

argo:FeeAndOtherExpense dei:LegalEntity

argo:OtherSubsidiariesAndEliminations


Fee
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0.60.40.40.50.20.50.40.50.00.70.50.60.50.90.10.7
Percentage of FeeAndOtherExpense66.744.440.041.710.041.730.838.50.036.831.230.022.718.03.017.1

argo:FeeAndOtherExpense us-gaap:ConsolidatedEntities

srt:SubsidiaryIssuer


Fee
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value0.30.50.60.71.80.70.90.81.61.21.1
Percentage of FeeAndOtherExpense33.355.660.058.390.058.369.261.5100.063.268.8

argo:FeeAndOtherIncome

argo:FeeAndOtherIncome


Fee
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value2.11.72.02.12.81.92.12.31.83.31.92.02.1133.83.6
Percentage of FeeAndOtherIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

argo:FeeAndOtherIncome dei:LegalEntity

argo:OtherSubsidiariesAndEliminations


Fee
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value1.51.11.41.32.11.21.41.21.11.11.21.21.30.70.90.8
Percentage of FeeAndOtherIncome71.464.770.061.975.063.266.752.261.133.363.260.061.95.423.722.2

argo:FeeAndOtherIncome us-gaap:ConsolidatedEntities

srt:SubsidiaryIssuer


Fee
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value0.60.60.60.80.70.70.71.10.72.20.7
Percentage of FeeAndOtherIncome28.635.330.038.125.036.833.347.838.966.736.8

argo:ForeignCurrencyTransactionLossRealized us-gaap:DerivativeInstrumentRisk

argo:ForeignCurrencyTransactionLossRealized

us-gaap:ForeignExchangeForward


Foreign
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
Value4.316191312304.9106.77.06.78.8158.66.0119.95.5
Percentage of ForeignCurrencyTransactionLossRealized100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

argo:ForeignCurrencyTransactionLossRealized us-gaap:DerivativeInstrumentRisk, us-gaap:InvestmentType

us-gaap:ForeignExchangeForward, argo:AssetManagerInvestmentExposure


Foreign
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0.82.10.90.60.40.20.10.30.2-9.50.95.75.90.93.65.41.4
Percentage of ForeignCurrencyTransactionLossRealized18.610.86.94.91.34.11.04.52.9-141.810.237.068.615.031.954.525.5

us-gaap:ForeignExchangeForward, argo:OperationalCurrencyExposure


Foreign
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
Value3.59.22.11.83.01.72.83.22.52.10.92.73.70.63.74.23.72.2
Percentage of ForeignCurrencyTransactionLossRealized81.455.110.813.724.65.657.130.837.330.013.430.724.07.061.737.237.440.0

us-gaap:ForeignExchangeForward, argo:ReturnStrategy


Foreign
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-2.47.515108.6281.97.13.94.7155.26.02.11.43.50.81.9
Percentage of ForeignCurrencyTransactionLossRealized-55.844.978.579.470.593.038.868.358.267.1228.459.139.024.423.331.08.134.5

argo:GainsLossesInInvestmentUnrealizedAppreciationDepreciationAfterTax

argo:GainsLossesInInvestmentUnrealizedAppreciationDepreciationAfterTax


Gains
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value14-53.52535112-107.0-0.4-4.236
Percentage of GainsLossesInInvestmentUnrealizedAppreciationDepreciationAfterTax100.0100.0100.0100.0100.0100.0100.0100.0100.0

argo:GainsLossesInInvestmentUnrealizedAppreciationDepreciationBeforeTax

argo:GainsLossesInInvestmentUnrealizedAppreciationDepreciationBeforeTax


Gains
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value18-66.12942136-126.2-1.1-4.643
Percentage of GainsLossesInInvestmentUnrealizedAppreciationDepreciationBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0

argo:GainsLossesInInvestmentUnrealizedAppreciationDepreciationBeforeTax us-gaap:InvestmentType

argo:OtherInvestmentsIncludingShortTermInvestments


Gains
Period End2021-06-302021-03-312020-06-302020-03-312019-12-312019-09-302019-06-30
Value0.1-0.40.2-0.20.9-0.84.5
Percentage of GainsLossesInInvestmentUnrealizedAppreciationDepreciationBeforeTax0.60.60.10.2-81.817.410.3

us-gaap:FixedMaturities


Gains
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value18-65.72942136-111.8-2.0-3.839
Percentage of GainsLossesInInvestmentUnrealizedAppreciationDepreciationBeforeTax99.499.498.699.599.988.6181.882.689.7

us-gaap:OtherLongTermInvestments


Gains
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value-0.30.20.0-14.20.04.40.0
Percentage of GainsLossesInInvestmentUnrealizedAppreciationDepreciationBeforeTax-1.00.50.011.3-0.0-95.70.0

argo:GrossRealizedInvestmentOnFixedMaturitiesAndOtherGains

argo:GrossRealizedInvestmentOnFixedMaturitiesAndOtherGains


Gross
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
Value261129184669201111128.6121919-22.4222229
Percentage of GrossRealizedInvestmentOnFixedMaturitiesAndOtherGains100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

argo:GrossRealizedInvestmentOnFixedMaturitiesAndOtherGains us-gaap:InvestmentType

us-gaap:FixedMaturities


Gross
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
Value175.56.67.22.5209.23.75.73.61.94.63.77.56.86.35.57.1
Percentage of GrossRealizedInvestmentOnFixedMaturitiesAndOtherGains65.847.822.240.05.430.145.333.050.929.022.137.719.239.1-30.427.524.324.5

us-gaap:OtherAssets


Gross
Period End2021-06-302020-09-302020-06-302019-06-30
Value3.3-0.20000000000000373320.0
Percentage of GrossRealizedInvestmentOnFixedMaturitiesAndOtherGains12.4-1.169.90.0

us-gaap:OtherLongTermInvestments


Gross
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-03-31
Value5.86.0-38.4101148117.55.58.86.77.4116.2
Percentage of GrossRealizedInvestmentOnFixedMaturitiesAndOtherGains21.852.2-129.360.024.769.954.767.049.171.077.960.760.921.4

argo:GrossRealizedInvestmentOnFixedMaturitiesAndOtherLosses

argo:GrossRealizedInvestmentOnFixedMaturitiesAndOtherLosses


Gross
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
Value221236313264211512-14.8131123157.8161814
Percentage of GrossRealizedInvestmentOnFixedMaturitiesAndOtherLosses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

argo:GrossRealizedInvestmentOnFixedMaturitiesAndOtherLosses us-gaap:InvestmentType

us-gaap:FixedMaturities


Gross
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
Value3.01.59.57.5107.73.01.64.72.41.82.86.54.94.04.85.06.2
Percentage of GrossRealizedInvestmentOnFixedMaturitiesAndOtherLosses13.112.426.224.232.612.014.310.737.9-16.213.724.127.432.251.328.427.643.1

us-gaap:OtherAssets


Gross
Period End2021-06-302020-09-30
Value110.4
Percentage of GrossRealizedInvestmentOnFixedMaturitiesAndOtherLosses50.21.3

us-gaap:OtherLongTermInvestments


Gross
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-03-31
Value8.89.5-48.51213319.58.45.28.15.18.89.37.1
Percentage of GrossRealizedInvestmentOnFixedMaturitiesAndOtherLosses38.478.5-134.040.643.249.545.256.041.9-54.738.975.961.249.3

argo:IncomeTaxExpenseBenefitRelatedToNetRealizedInvestmentAndOtherGains

argo:IncomeTaxExpenseBenefitRelatedToNetRealizedInvestmentAndOtherGains


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value5.22.63.0-0.56.7-8.04.3-0.32.69.78.43.32.4-2.94.12.21.34.3
Percentage of IncomeTaxExpenseBenefitRelatedToNetRealizedInvestmentAndOtherGains100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

argo:IncomeTaxExpenseBenefitRelatedToUnrealizedAppreciationDepreciationNetTaxEffects

argo:IncomeTaxExpenseBenefitRelatedToUnrealizedAppreciationDepreciationNetTaxEffects


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value4.0-12.64.37.024-19.2-0.7000000000000018-0.46.9
Percentage of IncomeTaxExpenseBenefitRelatedToUnrealizedAppreciationDepreciationNetTaxEffects100.0100.0100.0100.0100.0100.0100.0100.0100.0

argo:IncomeTaxReconciliationForeignExchangeAdjustments

argo:IncomeTaxReconciliationForeignExchangeAdjustments


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-300000.0-200000.01500000.0700000.01500000.0-2000000.0-1400000.0700000.0100000.0500000.0600000.0-1000000.00-200000.01000000.01400000.0-900000.0600000.0
Percentage of IncomeTaxReconciliationForeignExchangeAdjustments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0

argo:IncomeTaxReconciliationWithholdingTaxes

argo:IncomeTaxReconciliationWithholdingTaxes


Income
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value100000.0000000100000.00-100000.0200000.0200000.0100000.0100000.00200000.0100000.0
Percentage of IncomeTaxReconciliationWithholdingTaxes100.00.00.00.00.00.00.0100.00.0100.0100.0100.0100.0100.00.0100.0100.0

argo:IncreaseDecreaseInAccruedUnderwritingExpenses

argo:IncreaseDecreaseInAccruedUnderwritingExpenses


Increase
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
Value176.4-36.362-39.9-30.2-13.9-4.36.16.71628-25.6-3.818-20.8-2.5-19.2
Percentage of IncreaseDecreaseInAccruedUnderwritingExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

argo:IncreaseDecreaseInReinsurancePayablesAndFundsHeld

argo:IncreaseDecreaseInReinsurancePayablesAndFundsHeld


Increase
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-180.7158-136.038-44.7-96.0411244.5757571-53.7133-90.912293-36.6
Percentage of IncreaseDecreaseInReinsurancePayablesAndFundsHeld100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

argo:IncreaseDecreaseInSettlementsOfForeignCurrencyExchangeForwardContracts

argo:IncreaseDecreaseInSettlementsOfForeignCurrencyExchangeForwardContracts


Increase
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-7.1-1.70.32.13.93.11.5-11.16.33.6-3.5-0.30.61.7-2.9-0.53.3-2.8
Percentage of IncreaseDecreaseInSettlementsOfForeignCurrencyExchangeForwardContracts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

argo:IncreaseDecreaseInSettlementsOfForeignCurrencyExchangeForwardContracts dei:LegalEntity

argo:OtherSubsidiariesAndEliminations


Increase
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value2.02.23.83.11.2-11.65.83.3-4.5-1.2-0.53.0-0.35.02.5-2.8
Percentage of IncreaseDecreaseInSettlementsOfForeignCurrencyExchangeForwardContracts666.7104.897.4100.080.0104.592.191.7128.6400.0-83.3176.510.3-1000.075.8100.0

argo:IncreaseDecreaseInSettlementsOfForeignCurrencyExchangeForwardContracts us-gaap:ConsolidatedEntities

srt:ParentCompany


Increase
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value0.00.00.10.0-0.10.0-0.10.0-0.70.6
Percentage of IncreaseDecreaseInSettlementsOfForeignCurrencyExchangeForwardContracts0.00.02.60.0-6.7-0.0-1.60.020.0-200.0

srt:SubsidiaryIssuer


Increase
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-1.7-0.10.00.00.40.50.60.31.70.3
Percentage of IncreaseDecreaseInSettlementsOfForeignCurrencyExchangeForwardContracts-566.7-4.80.00.026.7-4.59.58.3-48.6-100.0

argo:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseChangeInParticipationInterest

argo:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseChangeInParticipationInterest


Liability
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-7.019-0.200000000000003730.00.5320.00.00.2-14.63.90.0-12.5-16.90.00.00.0-23.2
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseChangeInParticipationInterest100.0100.0100.00.0100.0100.00.00.0100.0100.0100.00.0100.0100.00.00.00.0100.0

argo:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNetReserveCededInReinsuranceToCloseTransaction

argo:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNetReserveCededInReinsuranceToCloseTransaction


Liability
Period End2021-06-302021-03-31
Value0.0207
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNetReserveCededInReinsuranceToCloseTransaction0.0100.0

argo:NetIncomeLossBeforeEquityInEarningsOfSubsidiaries

argo:NetIncomeLossBeforeEquityInEarningsOfSubsidiaries


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0.7-29.6-6.4-18.8-103.3-25.12891-43.640412428-61.34636
Percentage of NetIncomeLossBeforeEquityInEarningsOfSubsidiaries100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

argo:NetIncomeLossBeforeEquityInEarningsOfSubsidiaries dei:LegalEntity

argo:OtherSubsidiariesAndEliminations


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-16.3-25.4-51.4-4.1-67.8-26.620354016-21.6343.2-53.02428
Percentage of NetIncomeLossBeforeEquityInEarningsOfSubsidiaries-2328.685.8803.121.865.6106.070.538.4-92.440.4-51.7140.311.186.553.978.2

argo:NetIncomeLossBeforeEquityInEarningsOfSubsidiaries us-gaap:ConsolidatedEntities

srt:ParentCompany


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-15.8-5.5-5.5-9.933-4.9-10.6-3.237-5.8-7.6
Percentage of NetIncomeLossBeforeEquityInEarningsOfSubsidiaries-2257.118.685.952.7-32.019.5-36.8-3.5-84.9-14.3-18.2

srt:SubsidiaryIssuer


Net
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value321.350-4.8-16.56.41959-81.73071
Percentage of NetIncomeLossBeforeEquityInEarningsOfSubsidiaries4685.7-4.4-789.125.516.0-25.566.365.1187.473.9169.9

argo:NetLossesAndAdjustmentExpensesRelatedToPandemic

argo:NetLossesAndAdjustmentExpensesRelatedToPandemic


Net
Period End2020-09-302020-06-30
Value1617
Percentage of NetLossesAndAdjustmentExpensesRelatedToPandemic100.0100.0

argo:NetRealizedInvestmentGainsLossesNetOfIncomeTaxes

argo:NetRealizedInvestmentGainsLossesNetOfIncomeTaxes


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value191011-5.213-28.117-5.99.442-89.4108.1-12.8103.83.210
Percentage of NetRealizedInvestmentGainsLossesNetOfIncomeTaxes100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

argo:NetSupplementaryInsuranceInformationAmortizationDeferralOfDeferredPolicyAcquisitionCosts

argo:NetSupplementaryInsuranceInformationAmortizationDeferralOfDeferredPolicyAcquisitionCosts


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-1.66.7-7.09999999999999816-4.44.2-1.1-6.0-5.30.0-6.613-1.44.9-7.26.29.23.7
Percentage of NetSupplementaryInsuranceInformationAmortizationDeferralOfDeferredPolicyAcquisitionCosts100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0

argo:OtherComprehensiveIncomeLossNetofTaxIncludingCumulativeEffectofAdoption

argo:OtherComprehensiveIncomeLossNetofTaxIncludingCumulativeEffectofAdoption


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
Value19-54.42131107-110.4-1.9-4.2365076-4.2-118.5-32.0
Percentage of OtherComprehensiveIncomeLossNetofTaxIncludingCumulativeEffectofAdoption100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

argo:OtherComprehensiveIncomeLossNetofTaxIncludingCumulativeEffectofAdoption us-gaap:StatementEquityComponents

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value14-53.52535112-107.0-0.4-4.2365073-3.4-114.2-30.9
Percentage of OtherComprehensiveIncomeLossNetofTaxIncludingCumulativeEffectofAdoption74.298.3116.1115.2103.996.921.1100.0100.899.695.181.096.496.6

us-gaap:AccumulatedTranslationAdjustment


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
Value3.4-0.9-3.0-4.7-4.2-3.4-0.10.0-0.30.21.4-0.8-2.9-1.1
Percentage of OtherComprehensiveIncomeLossNetofTaxIncludingCumulativeEffectofAdoption17.91.7-13.8-15.2-3.93.15.3-0.0-0.80.41.819.02.43.4

argo:OtherCorporateExpenseCivilPenalties

argo:OtherCorporateExpenseCivilPenalties


Other
Period End2020-09-302020-06-30
Value0900000.0
Percentage of OtherCorporateExpenseCivilPenalties0.0100.0

argo:OtherUnderwritingAcquisitionAndInsuranceExpenses

argo:OtherUnderwritingAcquisitionAndInsuranceExpenses


Other
Period End2021-06-302021-03-312020-06-302020-03-31
Value10410698107
Percentage of OtherUnderwritingAcquisitionAndInsuranceExpenses100.0100.0100.0100.0

argo:PaymentsForProceedsFromChangeInForeignRegulatoryDepositsAndVoluntaryPools

argo:PaymentsForProceedsFromChangeInForeignRegulatoryDepositsAndVoluntaryPools


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-45.09.14.95.5-1.1-3.92.34.0-6.60.30.4-0.3-8.0-5.1-20.0174.35.2
Percentage of PaymentsForProceedsFromChangeInForeignRegulatoryDepositsAndVoluntaryPools100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

argo:PaymentsForProceedsFromChangeInForeignRegulatoryDepositsVoluntaryPoolsShorttermInvestments

argo:PaymentsForProceedsFromChangeInForeignRegulatoryDepositsVoluntaryPoolsShorttermInvestments


Payments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value17-79.8-101.3-116.249271-36.0-38.085-33.8-93.4161-35.336-180.1-120.3
Percentage of PaymentsForProceedsFromChangeInForeignRegulatoryDepositsVoluntaryPoolsShorttermInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

argo:PaymentsForProceedsFromChangeInForeignRegulatoryDepositsVoluntaryPoolsShorttermInvestments dei:LegalEntity

argo:OtherSubsidiariesAndEliminations


Payments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-121.3984012106324.3-0.842-95.3-92.41561.9-4.8-173.7-54.3
Percentage of PaymentsForProceedsFromChangeInForeignRegulatoryDepositsVoluntaryPoolsShorttermInvestments-701.2-123.7-39.9-11.121.645.2-11.92.149.2282.098.997.2-5.4-13.396.445.1

argo:PaymentsForProceedsFromChangeInForeignRegulatoryDepositsVoluntaryPoolsShorttermInvestments us-gaap:ConsolidatedEntities

srt:ParentCompany


Payments
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value0.50.4-0.30.3-0.7-0.9-1.93.4-0.7
Percentage of PaymentsForProceedsFromChangeInForeignRegulatoryDepositsVoluntaryPoolsShorttermInvestments-0.6-0.40.30.1-1.02.55.04.02.1

srt:SubsidiaryIssuer


Payments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value139-179.0-142.1-128.838640-39.4-35.34062
Percentage of PaymentsForProceedsFromChangeInForeignRegulatoryDepositsVoluntaryPoolsShorttermInvestments804.6224.3140.3110.878.455.8109.492.946.8-184.0

argo:PaymentsForProceedsFromPurchasesOfFixedAssetAndOtherInvestingActivities

argo:PaymentsForProceedsFromPurchasesOfFixedAssetAndOtherInvestingActivities


Payments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312017-09-302017-06-302017-03-31
Value-6.50.57.55.149-44.910270.34.524-1.7361.3
Percentage of PaymentsForProceedsFromPurchasesOfFixedAssetAndOtherInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

argo:PaymentsForProceedsFromPurchasesOfFixedAssetAndOtherInvestingActivities dei:LegalEntity

argo:OtherSubsidiariesAndEliminations


Payments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312017-09-302017-06-302017-03-31
Value11-26.1232210-39.87.22419-19.23.25.75.019
Percentage of PaymentsForProceedsFromPurchasesOfFixedAssetAndOtherInvestingActivities-175.4-5220.0316.0441.220.388.666.788.06600.0-426.713.3-335.313.71530.8

argo:PaymentsForProceedsFromPurchasesOfFixedAssetAndOtherInvestingActivities us-gaap:ConsolidatedEntities

srt:SubsidiaryIssuer


Payments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-17.926-16.2-17.439-5.13.63.3-19.523
Percentage of PaymentsForProceedsFromPurchasesOfFixedAssetAndOtherInvestingActivities275.45320.0-216.0-341.279.711.433.312.0-6500.0526.7

argo:PaymentsToAcquireEquitySecuritiesFVNI

argo:PaymentsToAcquireEquitySecuritiesFVNI


Payments
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value0.5108.84712111720121442
Percentage of PaymentsToAcquireEquitySecuritiesFVNI100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

argo:PremiumReceivableAllowanceForCreditLossForeignExchangeAdjustments

argo:PremiumReceivableAllowanceForCreditLossForeignExchangeAdjustments


Premium
Period End2020-12-31
Value100000.0
Percentage of PremiumReceivableAllowanceForCreditLossForeignExchangeAdjustments100.0

argo:PremiumTaxesBoardsAndBureaus

argo:PremiumTaxesBoardsAndBureaus


Premium
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value5.89.46.58.06.0107.98.35.39.88.19.36.4116.77.4
Percentage of PremiumTaxesBoardsAndBureaus100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

argo:ProceedsFromSaleOfDepositaryShares

argo:ProceedsFromSaleOfDepositaryShares


Proceeds
Period End2020-07-09
Value144
Percentage of ProceedsFromSaleOfDepositaryShares100.0

argo:ProceedsFromSaleOfInvestments

argo:ProceedsFromSaleOfInvestments


Proceeds
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value118242210638671365542272182392469555451319504454
Percentage of ProceedsFromSaleOfInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

argo:ProceedsFromSaleOfInvestments dei:LegalEntity

argo:OtherSubsidiariesAndEliminations


Proceeds
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-11.7115653281181281911157879143230294181218225
Percentage of ProceedsFromSaleOfInvestments-9.947.531.251.517.735.135.442.542.820.330.641.565.356.843.449.6

argo:ProceedsFromSaleOfInvestments us-gaap:ConsolidatedEntities

srt:SubsidiaryIssuer


Proceeds
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value129127144309553237350156104312
Percentage of ProceedsFromSaleOfInvestments109.952.568.848.582.364.964.657.557.279.7

argo:ProceedsfromSaleAndMaturityOfEquitySecuritiesFVNI

argo:ProceedsfromSaleAndMaturityOfEquitySecuritiesFVNI


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
Value18147.210-16.7243083417157360
Percentage of ProceedsfromSaleAndMaturityOfEquitySecuritiesFVNI100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

argo:UnderwritingAcquisitionAndInsuranceExpenseGross

argo:UnderwritingAcquisitionAndInsuranceExpenseGross


Underwriting
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
Value175183178180157172167161163160163181155165153172163157
Percentage of UnderwritingAcquisitionAndInsuranceExpenseGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

argo:UnderwritingAcquisitionAndInsuranceExpenses

argo:UnderwritingAcquisitionAndInsuranceExpenses


Underwriting
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
Value177176185164161168180167168160169168156160161166154153
Percentage of UnderwritingAcquisitionAndInsuranceExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

argo:UnderwritingAcquisitionAndInsuranceExpenses dei:LegalEntity

argo:OtherSubsidiariesAndEliminations


Underwriting
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value74575660746256558679558888869287
Percentage of UnderwritingAcquisitionAndInsuranceExpenses39.834.835.036.041.537.133.534.851.047.435.454.955.052.159.756.6

argo:UnderwritingAcquisitionAndInsuranceExpenses us-gaap:ConsolidatedEntities

srt:ParentCompany


Underwriting
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value6.94.53.25.8-9.62.08.20.2-0.23.35.8
Percentage of UnderwritingAcquisitionAndInsuranceExpenses3.72.72.03.5-5.31.24.90.1-0.12.03.7

srt:SubsidiaryIssuer


Underwriting
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value104102101101103103104104838595
Percentage of UnderwritingAcquisitionAndInsuranceExpenses56.462.563.060.657.461.761.764.849.150.660.9

argo:UnderwritingAcquisitionAndInsuranceExpenses us-gaap:Restatement

srt:RestatementAdjustment


Underwriting
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value0.2-0.10.10.00.00.2
Percentage of UnderwritingAcquisitionAndInsuranceExpenses0.1-0.10.10.00.00.1

srt:ScenarioPreviouslyReported


Underwriting
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value164161168180164161
Percentage of UnderwritingAcquisitionAndInsuranceExpenses100.0100.0100.0100.097.895.6

argo:UndistributedEarningsFromAlternativeInvestmentPortfolio

argo:UndistributedEarningsFromAlternativeInvestmentPortfolio


Undistributed
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-29.9-20.7-10.2-19.323-2.5-0.5-8.0-9.5-1.90.9-6.8-5.2-8.7-10.9-5.7-24.6-8.3
Percentage of UndistributedEarningsFromAlternativeInvestmentPortfolio100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtAndEquitySecuritiesGainLossExcludingOtherThanTemporaryImpairmentLoss

us-gaap:DebtAndEquitySecuritiesGainLossExcludingOtherThanTemporaryImpairmentLoss


Debt
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value14-5.720-36.130-1.21456
Percentage of DebtAndEquitySecuritiesGainLossExcludingOtherThanTemporaryImpairmentLoss100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value-0.12.10.9-17.57.824
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded100.0100.0100.0100.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded us-gaap:InvestmentType

us-gaap:CorporateBondSecurities


Debt
Period End2021-06-302021-03-312020-12-31
Value-0.12.10.9
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded100.0100.0100.0

us-gaap:ForeignGovernmentDebtSecurities


Debt
Period End2020-12-31
Value0.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded0.0

us-gaap:USStatesAndPoliticalSubdivisions


Debt
Period End2020-12-31
Value0.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded0.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossPeriodIncreaseDecrease

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossPeriodIncreaseDecrease


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-06-302019-03-31
Value-0.41.1-3.1107.8240.00.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossPeriodIncreaseDecrease100.0100.0100.0100.0100.0100.00.00.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossPeriodIncreaseDecrease us-gaap:IncomeStatementLocation

us-gaap:GainLossOnInvestmentsMember1


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value-0.41.1-3.1107.824
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossPeriodIncreaseDecrease100.0100.0100.0100.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossPeriodIncreaseDecrease us-gaap:InvestmentType

argo:OtherThanTemporaryImpairmentLossesOnFixedMaturities


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value-0.41.1-3.1107.8245.02.54.3
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossPeriodIncreaseDecrease100.0100.0100.0100.0100.0100.00.00.00.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold


Debt
Period End2021-06-302021-03-312020-12-31
Value-500000.0-400000.0-23600000.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold100.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold us-gaap:InvestmentType

us-gaap:CorporateBondSecurities


Debt
Period End2021-06-302021-03-312020-12-31
Value-500000.0-400000.0-23500000.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold100.0100.099.6

us-gaap:ForeignGovernmentDebtSecurities


Debt
Period End2020-12-31
Value0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold-0.0

us-gaap:DepreciationAndAmortization

us-gaap:DepreciationAndAmortization


Depreciation
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
Value112.98.500000000000004109.15.06.96.67.16.78.89.37.76.19.48.57.68.38.09.67.810.08.011108.99.49.87.61010109.09.78.7117.98.49.49.07.26.37.98.68.07.8
Percentage of DepreciationAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DividendsCash dei:LegalEntity

us-gaap:DividendsCash

argo:RockwoodCasualtyInsuranceCompany


Dividends
Period End2020-12-312019-12-312018-12-312016-12-31
Value10.0302018
Percentage of DividendsCash100.0100.0100.0100.0

us-gaap:DividendsCommonStockCash

us-gaap:DividendsCommonStockCash


Dividends
Period End2021-06-302021-03-312020-12-312020-09-112020-09-302020-06-122020-06-302020-03-162020-03-312019-12-312019-09-132019-09-302019-06-212019-06-302019-03-152019-03-312018-12-312018-09-142018-09-302018-06-152018-06-302018-03-232018-02-202018-03-312017-12-312017-09-152017-09-302017-06-262017-06-302017-03-152017-03-312016-08-292016-06-172016-03-152015-09-152015-06-152015-03-192014-12-312014-09-152014-06-162014-03-172013-12-162013-12-312013-09-162013-09-302013-06-202013-06-302013-03-152013-03-312012-12-172012-12-312012-09-182012-09-302012-06-152012-06-302012-03-152012-03-312011-12-312011-09-302011-06-302011-03-31
Value11101010101010101010109.8111110109.59.39.39.49.49.39.39.38.38.38.38.38.38.38.36.76.96.25.65.65.74.84.74.74.04.04.04.04.04.14.13.73.73.03.03.03.03.13.13.23.13.23.33.33.3
Percentage of DividendsCommonStockCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DividendsCommonStockCash us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Dividends
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
Value111010101010109.811109.59.39.49.38.38.38.38.3
Percentage of DividendsCommonStockCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DividendsPreferredStockCash

us-gaap:DividendsPreferredStockCash


Dividends
Period End2021-06-302021-03-312020-12-312020-09-30
Value2700000.02600000.02600000.02000000.0
Percentage of DividendsPreferredStockCash100.0100.0100.0100.0

us-gaap:DividendsPreferredStockCash us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Dividends
Period End2021-06-302021-03-312020-12-312020-09-30
Value2700000.02600000.02600000.02000000.0
Percentage of DividendsPreferredStockCash100.0100.0100.0100.0

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Effect
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
Value900000.0800000.0-4100000.0-3200000.0-3900000.01400000.0-1200000.01600000.0-600000.0100000.0-4000000.01300000.0
Percentage of EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents dei:LegalEntity

argo:OtherSubsidiariesAndEliminations


Effect
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-4100000.0-3200000.0-3900000.01400000.0-1200000.01600000.0-600000.0100000.0-4000000.01300000.0
Percentage of EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquitySecuritiesFvNiGainLoss

us-gaap:EquitySecuritiesFvNiGainLoss


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value2113217.35.8-40.922-2.41354-13.61314
Percentage of EquitySecuritiesFvNiGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquitySecuritiesFvNiRealizedGainLoss

us-gaap:EquitySecuritiesFvNiRealizedGainLoss


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value0.7-1.8-1.3-3.2-11.0-1.61216.40.60.7-9.19.110
Percentage of EquitySecuritiesFvNiRealizedGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquitySecuritiesFvNiUnrealizedGainLoss

us-gaap:EquitySecuritiesFvNiUnrealizedGainLoss


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value2015221016-39.3-98.8-8.81254-4.54.54.3
Percentage of EquitySecuritiesFvNiUnrealizedGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquitySecuritiesFvNiUnrealizedGainLoss us-gaap:Restatement

srt:RestatementAdjustment


Equity
Period End2020-09-302020-06-30
Value0.0-1.7
Percentage of EquitySecuritiesFvNiUnrealizedGainLoss0.0-10.1

srt:ScenarioPreviouslyReported


Equity
Period End2020-09-302020-06-30
Value1016
Percentage of EquitySecuritiesFvNiUnrealizedGainLoss100.0100.0

us-gaap:ExtinguishmentOfDebtAmount

us-gaap:ExtinguishmentOfDebtAmount


Extinguishment
Period End2020-09-17
Value125
Percentage of ExtinguishmentOfDebtAmount100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value8.5-2.3-4.3-1.70.10.0-2.30.0-0.20.50.40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0-0.10.00.00.0-13.9
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1100.0100.0100.0100.0100.00.0100.00.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0100.00.00.00.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 us-gaap:InvestmentType

us-gaap:EquitySecurities


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value8.5-2.3-4.3-1.70.10.0-1.90.0-0.20.50.40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0-0.10.00.00.00.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1100.0100.0100.0100.0100.00.082.60.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0100.00.00.00.0-0.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss


Fair
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value0.0-0.50.9-0.91.1-0.4-0.10.00.40.00.00.20.0-0.10.00.00.00.00.00.00.00.00.0-0.10.00.00.00.00.1-0.10.00.00.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss0.0100.0100.0100.0100.0100.0100.00.0100.00.00.0100.00.0100.00.00.00.00.00.00.00.00.00.0100.00.00.00.00.0100.0100.00.00.00.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss us-gaap:InvestmentType

argo:CreditFinancial


Fair
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-06-302018-03-31
Value0.0-0.50.00.01.1-0.4-0.10.00.40.00.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss0.0100.00.0-0.0100.0100.0100.00.0100.00.00.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value0.00.1-7.65.27.70.00.00.11.80.0-3.35.80.01.70.00.00.00.02.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0-11.36.54.89.00.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases0.0100.0100.0100.0100.00.00.0100.0100.00.0100.0100.00.0100.00.00.00.00.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0100.0100.0100.0100.00.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases us-gaap:InvestmentType

argo:CreditFinancial


Fair
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-06-302018-03-31
Value0.00.10.00.00.00.11.80.0-2.21.70.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases-0.01.90.00.00.0100.0100.00.066.729.30.0

us-gaap:EquitySecurities


Fair
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value-7.65.17.70.00.00.00.00.0-1.14.10.01.70.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases100.098.1100.00.00.00.00.00.033.370.70.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0-0.00.00.00.00.0

us-gaap:ShortTermInvestments


Fair
Period End2021-06-302021-03-31
Value0.00.1
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases0.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales


Fair
Period End2021-06-302021-03-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value3100000.0400000.000100000.0300000.0001600000.0400000.0000000100000.0100000.0100000.0100000.000100000.0200000.0100000.0100000.0100000.00600000.0-3300000.03300000.0-550000.02500000.02400000.0-900000.0-11100000.0-500000.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales100.0100.00.00.0100.0100.00.00.0100.0100.00.00.00.00.00.00.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales us-gaap:InvestmentType

argo:CreditFinancial


Fair
Period End2021-06-302021-03-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-06-302018-03-31
Value3100000.0400000.000100000.0300000.000000
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales100.0100.00.00.0100.0100.00.00.00.00.00.0

us-gaap:ForeignCurrencyTransactionGainLossBeforeTax

us-gaap:ForeignCurrencyTransactionGainLossBeforeTax


Foreign
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-4.4-1.3-0.4-11.6-6.43.04.51.65.3-0.7-2.21.75.5-4.9-2.3-0.1-4.60.79.01.5-4.5-1.59.91.8-3.09.65.06.0-3.40.2-3.5-3.85.93.1-7.19.79.8-2.97.61.9-3.4-9.6-8.1-3.48.56.8
Percentage of ForeignCurrencyTransactionGainLossBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ForeignCurrencyTransactionGainLossBeforeTax dei:LegalEntity

argo:OtherSubsidiariesAndEliminations


Foreign
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-0.4-11.0-6.42.03.81.75.2-0.4-2.21.75.6-4.8-2.0-0.2-4.70.8
Percentage of ForeignCurrencyTransactionGainLossBeforeTax100.094.8100.066.784.4106.298.157.1100.0100.0101.898.087.0200.0102.2114.3

us-gaap:ForeignCurrencyTransactionGainLossBeforeTax us-gaap:ConsolidatedEntities

srt:SubsidiaryIssuer


Foreign
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value0.0-0.60.01.0-0.4-0.10.1-0.30.00.0-0.1
Percentage of ForeignCurrencyTransactionGainLossBeforeTax-0.05.2-0.033.3-8.9-6.21.942.9-0.00.0-1.8

us-gaap:ForeignCurrencyTransactionGainLossBeforeTax us-gaap:Restatement

srt:RestatementAdjustment


Foreign
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value3.22.1-3.91.1-0.7-1.51.3
Percentage of ForeignCurrencyTransactionGainLossBeforeTax-27.6-32.8-130.024.4-43.8-28.3-185.7

srt:ScenarioPreviouslyReported


Foreign
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-11.6-6.43.03.41.65.3-0.7
Percentage of ForeignCurrencyTransactionGainLossBeforeTax100.0100.0100.075.6100.0100.0100.0

us-gaap:ForeignCurrencyTransactionGainLossRealized us-gaap:DerivativeInstrumentRisk

us-gaap:ForeignCurrencyTransactionGainLossRealized

us-gaap:ForeignExchangeForward


Foreign
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
Value4.11322148.9316.89.66.87.78.97.414118.06.54.25.6163.5169.59.58.64.214
Percentage of ForeignCurrencyTransactionGainLossRealized100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ForeignCurrencyTransactionGainLossRealized us-gaap:DerivativeInstrumentRisk, us-gaap:InvestmentType

us-gaap:ForeignExchangeForward, argo:AssetManagerInvestmentExposure


Foreign
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
Value0.91.01.20.00.20.8-0.41.80.31.1-8.61.48.74.30.40.60.00.5
Percentage of ForeignCurrencyTransactionGainLossRealized22.07.55.40.02.22.6-5.918.84.414.3-96.618.959.238.45.09.20.08.9

us-gaap:ForeignExchangeForward, argo:OperationalCurrencyExposure


Foreign
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
Value3.23.93.14.20.55.43.51.30.60.33.30.41.74.34.91.83.72.0
Percentage of ForeignCurrencyTransactionGainLossRealized78.029.113.829.05.617.351.513.58.83.937.15.411.638.461.227.788.135.7

us-gaap:ForeignExchangeForward, argo:ReturnStrategy


Foreign
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-2.48.518108.2253.76.55.96.3145.64.32.62.74.10.53.1
Percentage of ForeignCurrencyTransactionGainLossRealized-58.563.480.871.092.180.154.467.786.881.8159.675.729.323.233.863.111.955.4

us-gaap:GainLossOnDerivativeInstrumentsNetPretax us-gaap:DerivativeInstrumentRisk

us-gaap:GainLossOnDerivativeInstrumentsNetPretax

us-gaap:ForeignExchangeForward


Gain
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value-0.2-3.32.91.4-3.31.11.9-0.80.10.72.2-1.4-0.72.62.0-4.8-5.70.1130.30.0-11.82.24.7-2.810
Percentage of GainLossOnDerivativeInstrumentsNetPretax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0

us-gaap:GainLossOnDispositionOfAssets1

us-gaap:GainLossOnDispositionOfAssets1


Gain
Period End2020-12-312020-09-302020-06-302020-03-312019-06-302019-03-31
Value-1500000.0-200000.00-200000.0-100000.00
Percentage of GainLossOnDispositionOfAssets1100.0100.00.0100.0100.00.0

us-gaap:GoodwillWrittenOffRelatedToSaleOfBusinessUnit us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

us-gaap:GoodwillWrittenOffRelatedToSaleOfBusinessUnit

us-gaap:DisposalGroupDisposedOfBySaleNotDiscontinuedOperations, argo:ArielRe


Goodwill
Period End2020-11-25
Value9200000.0
Percentage of GoodwillWrittenOffRelatedToSaleOfBusinessUnit100.0

us-gaap:ImpairmentOfIntangibleAssetsExcludingGoodwill us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

us-gaap:ImpairmentOfIntangibleAssetsExcludingGoodwill

us-gaap:DisposalGroupDisposedOfBySaleNotDiscontinuedOperations, argo:ArielRe


Impairment
Period End2020-11-25
Value30
Percentage of ImpairmentOfIntangibleAssetsExcludingGoodwill100.0

us-gaap:IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance

us-gaap:IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-1200000.0-800000.0-700000.01200000.000-2700000.02200000.00-600000.02100000.0-200000.0-700000.0-2700000.0-600000.0800000.0-1000000.0-100000.0
Percentage of IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance100.0100.0100.0100.00.00.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeTaxReconciliationChangeInEnactedTaxRate

us-gaap:IncomeTaxReconciliationChangeInEnactedTaxRate


Income
Period End2021-06-302017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value-7.4-18.70.8-1.8-0.71.5-0.90.9-1.5-0.60.80.35.5590.8-2.630
Percentage of IncomeTaxReconciliationChangeInEnactedTaxRate100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate

us-gaap:IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-30
Value166.31.2-6.58.60.8-5.4-4.13.614-18.68.418-0.4-0.2-5.5107.2109.87.65.84.73.76.211166.19.8
Percentage of IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses

us-gaap:IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses


Income
Period End2020-12-312020-09-302020-06-302019-06-30
Value001000000.00
Percentage of IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses0.00.0100.00.0

us-gaap:IncomeTaxReconciliationOtherAdjustments

us-gaap:IncomeTaxReconciliationOtherAdjustments


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value700000.0-1300000.0-700000.01400000.01200000.0-1500000.04900000.0500000.0-2700000.0-5500000.0-100000.0-100000.0-2500000.03900000.01300000.00-1100000.0100000.0100000.0100000.00200000.00100000.00200000.0300000.0-100000.0-1000000.0100000.01700000.0-500000.00-900000.01000000.0100000.0200000.0500000.0-1400000.0800000.00900000.0-200000.01000000.00
Percentage of IncomeTaxReconciliationOtherAdjustments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.00.0100.00.0100.00.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.0

us-gaap:IncomeTaxReconciliationPriorYearIncomeTaxes

us-gaap:IncomeTaxReconciliationPriorYearIncomeTaxes


Income
Period End2020-09-302020-03-312019-09-302019-03-312018-09-302017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-312014-09-302013-12-312013-09-30
Value900000.0000-2200000.0-1200000.00-700000.0-100000.0-800000.00-1500000.00-600000.0200000.0-1100000.0-1600000.00
Percentage of IncomeTaxReconciliationPriorYearIncomeTaxes100.00.00.00.0100.0100.00.0100.0100.0100.00.0100.00.0100.0100.0100.0100.00.0

us-gaap:IncomeTaxReconciliationTaxContingencies

us-gaap:IncomeTaxReconciliationTaxContingencies


Income
Period End2021-06-302021-03-312020-12-312020-09-30
Value600000.0-2400000.0-2000000.02700000.0
Percentage of IncomeTaxReconciliationTaxContingencies100.0100.0100.0100.0

us-gaap:IncomeTaxReconciliationTaxExemptIncome

us-gaap:IncomeTaxReconciliationTaxExemptIncome


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value100000.0200000.0200000.0200000.0200000.0100000.0100000.0400000.0300000.0400000.0500000.0400000.0500000.0500000.01200000.01100000.01100000.01300000.0
Percentage of IncomeTaxReconciliationTaxExemptIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccruedIncomeTaxesPayable

us-gaap:IncreaseDecreaseInAccruedIncomeTaxesPayable


Increase
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
Value7.21.3-4.7-38.39.2161.03.51.23.2-14.9-6.1113.6-12.4-2.45.40.50.2106.72.45.6-11.01.07.715-22.12.3-15.519-6.34.7-0.78.40.3-5.4-5.03.7-1.1-2.5-6.8-1.2-2.4-2.28.8
Percentage of IncreaseDecreaseInAccruedIncomeTaxesPayable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccruedInterestReceivableNet

us-gaap:IncreaseDecreaseInAccruedInterestReceivableNet


Increase
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-1700000.0600000.0-400000.0-1200000.0200000.0-2500000.0-2000000.01000000.0-800000.0300000.0800000.01500000.0500000.0700000.00600000.01200000.0900000.0-1200000.01200000.0-600000.0-300000.0600000.0400000.0-300000.0-1200000.0100000.0-2000000.0200000.0-1700000.0-300000.0-2100000.0-6300000.03400000.01500000.0-2100000.0600000.0-2000000.0800000.0-1200000.01200000.0-2000000.01600000.0-2100000.02400000.0800000.0
Percentage of IncreaseDecreaseInAccruedInterestReceivableNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInDeferredPolicyAcquisitionCosts

us-gaap:IncreaseDecreaseInDeferredPolicyAcquisitionCosts


Increase
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-2.16.5-7.116-4.0-1.10.5-4.0-4.00.5-7.913-1.02.5-8.25.97.76.1-8.53.17.93.9-9.12.69.65.4-5.74.48.60.0-1.43.512-0.4-8.33.02.60.6-10.50.82.2-6.5-20.6-6.2-8.7-10.5
Percentage of IncreaseDecreaseInDeferredPolicyAcquisitionCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInFuturePolicyBenefitReserves

us-gaap:IncreaseDecreaseInFuturePolicyBenefitReserves


Increase
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
Value97-268.212169177-78.8314111681535751-28.4-42.7-102.66716223661033614183443-2.2-14.3-22.337-182.5-10.3-10.729-17.8-4.34.2-41.9-36.9-58.5-6.56.9197-78.115-17.128
Percentage of IncreaseDecreaseInFuturePolicyBenefitReserves100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInPremiumsReceivable

us-gaap:IncreaseDecreaseInPremiumsReceivable


Increase
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
Value91-242.5-149.996186-217.6177120163-1.84099554-0.9-88.2587126-22.8627011371204110712-42.6-45.192-261.0-90.2-14.2-59.4779.71090-136.32.81684-155.8-55.7-15.931-213.8
Percentage of IncreaseDecreaseInPremiumsReceivable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInPrepaidReinsurancePremiums

us-gaap:IncreaseDecreaseInPrepaidReinsurancePremiums


Increase
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
Value3.211-87.34.94.1111-59.31031104-67.027-6.493-61.624-2.143-8.6-0.53.656-12.62.55.051-18.8-16.1-7.955-34.5-8.784-37.3-19.4-1.8-3.939-48.331310.6-19.9-11.01.9-4.7
Percentage of IncreaseDecreaseInPrepaidReinsurancePremiums100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInUnearnedPremiums

us-gaap:IncreaseDecreaseInUnearnedPremiums


Increase
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
Value40-33.6-113.1942359-86.0945943-103.01121947-77.0109467.3-40.2534619-46.5406913-48.529553.3-67.437747.1-56.856693.8-65.25827-16.4-95.6-3.5-10.3-40.1
Percentage of IncreaseDecreaseInUnearnedPremiums100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements


Incremental
Period End2021-06-302021-03-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value192130.0225360.000-608610.00584740.0753610.0-10439.0699630.0730410.0871590.0-22892.00846620.0894330.017508.0709750.0622560.0593620.017881.0557920.0521760.0547690.08680.0480330.0466760.0451980.0-13351.01137400.01047200.0827330.097791.0529690.0386330.0304900.000345090.0035086.0371450.0400360.0
Percentage of IncrementalCommonSharesAttributableToShareBasedPaymentArrangements100.0100.00.00.0100.00.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.00.0100.0100.0100.0

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1


Liability
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value263365625272607355345071118331247661276350402463523319301-186.94327331
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1


Liability
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value145230233181187263190183211221196142140186186122135155133103155144129122172141986-725.8140150983
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseForeignCurrencyTranslationGainLoss

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseForeignCurrencyTranslationGainLoss


Liability
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value-6.90.8-10.7-31.5-17.125-10.1133.99.124-3.2230.8-19.5-17.11.8-3.6113.4-8.03.67.513
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseForeignCurrencyTranslationGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1


Liability
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value2713073253282732803593382842372802772452372703262302222142071961911912001901831306-927.11851821296
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1 dei:LegalEntity

argo:OtherSubsidiariesAndEliminations


Liability
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value1311171059016916111379103140131141180227158146
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims140.235.738.632.247.247.639.933.636.950.753.459.866.769.668.665.8

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1 us-gaap:ConsolidatedEntities

srt:SubsidiaryIssuer


Liability
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value194211167190189177171158177136114
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims159.864.361.467.852.852.460.166.463.149.346.6

us-gaap:NoninterestExpenseCommissionExpense

us-gaap:NoninterestExpenseCommissionExpense


Noninterest
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
Value717666795765635856636788566854706961555962574956675853596354545765514255514940495044354655
Percentage of NoninterestExpenseCommissionExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax

us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax


Other
Period End2021-06-30
Value400000.0
Percentage of OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax100.0

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312014-03-312013-12-312013-09-302013-06-302013-03-31
Value14-53.52535112-107.0-0.4-4.23650-17.3-8.5-18.8-30.91.36116-65.013
Percentage of OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value14-53.52535112-107.0-0.4-4.23650-17.3-8.5-18.8-30.9
Percentage of OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax


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
Value32-51.21927121-105.1-3.9-6.73447-24.6-2.1-34.3-21.83.2282024-26.8112932-13.4-55.4-2.3-24.6-22.5-36.2381.16515-55.513
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value27-50.32231125-101.7-2.4-6.73547-27.0-1.3-31.4-20.73.6282124-27.8122731-14.1-51.4-2.8-21.5-17.9-33.9381.3
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax85.098.2118.1117.4103.596.861.5100.0100.999.6109.861.991.595.0112.598.6105.997.6103.7108.992.295.4105.292.8121.787.479.693.698.4118.2

us-gaap:AccumulatedTranslationAdjustment


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value3.4-0.9-3.0-4.7-4.2-3.4-0.10.0-0.30.21.4-0.8-2.9-1.1-1.20.4-1.20.61.2-1.02.31.50.6-4.00.5-3.1-2.2-2.30.6-0.2
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax10.41.8-15.5-17.4-3.53.22.6-0.0-0.90.4-5.738.18.55.0-37.51.4-5.92.4-4.5-8.97.84.6-4.57.2-21.712.69.86.41.6-18.2

us-gaap:OtherComprehensiveIncomeLossBeforeTax

us-gaap:OtherComprehensiveIncomeLossBeforeTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value23-67.02538132-129.6-3.0-4.64360-22.3-5.6-24.5-38.30.3212318-36.81.84132-16.1-73.6-19.3-24.9-36.3-46.9344.8-4.119-98.423-22.763-19.44839-62.713
Percentage of OtherComprehensiveIncomeLossBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value3400000.0-900000.0-3000000.0-4700000.0-4200000.0-3400000.0-100000.00-300000.0200000.01400000.0-800000.0-2900000.0-1100000.0-1200000.0400000.0-1200000.0600000.01200000.0-1000000.02300000.01500000.0600000.0-4000000.0500000.0-3100000.0-2200000.0-2300000.0600000.0-200000.0-600000.0-300000.0-1900000.00100000.0900000.0-4400000.01100000.0-1500000.0-5000000.0100000.0
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax


Other
Period End2021-06-30
Value1900000.0
Percentage of OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax100.0

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value154.0-2.6-4.5163.4-2.2-2.8-1.8-3.1-5.22.4-15.1125.3172.716-1.9170.37.80.3-0.19.5-2.58.65.8160.1413.3140.73.31.74.0
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value1.50.8-0.52.6-1.9-0.2-0.3-0.2-0.5-0.60.3-2.52.31.75.51.05.21.47.9-0.24.11.71.72.80.12.74.13.00.1122.04.8-0.10.80.41.2
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossTax

us-gaap:OtherComprehensiveIncomeLossTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value4.4-12.64.1999999999999987.024-19.2-1.1-0.46.99.6-2.3-1.4-2.8-6.30.74.65.14.6-13.3-0.3123.7-4.1-20.0-10.3-2.9-7.9-9.08.83.7-0.13.4-31.510-8.117-1.61214-11.63.80.1-11.4226.74.4
Percentage of OtherComprehensiveIncomeLossTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeOtherNetOfTax

us-gaap:OtherComprehensiveIncomeOtherNetOfTax


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
Value4900000.0-900000.0-3500000.0-4700000.0-4200000.0-3400000.0-1500000.00-300000.0200000.0-2700000.04300000.0-2900000.0-1100000.0
Percentage of OtherComprehensiveIncomeOtherNetOfTax100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeOtherNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value4900000.0-900000.0-3500000.0-4700000.0-4200000.0-3400000.0-1500000.00-300000.0200000.0-2700000.04300000.0-2900000.0-1100000.0
Percentage of OtherComprehensiveIncomeOtherNetOfTax100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value33-62.12638152-122.8-3.3-7.44156-30.1-2.4-36.7-24.75.6382734-39.6193938-16.8-69.7-10.3-24.3-21.8-38.8495.13623-82.224-19.564-10.15253-50.0379.8-33.3861123
Percentage of OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value5.5-11.84.16.527-21.1-0.9-0.76.79.1-3.1-1.1-5.3-4.02.0106.19.8-11.87.6127.8-2.7-18.3-7.5-2.8-3.9-4.9113.8115.4-26.710-7.317-0.11418-9.2110.6-10.3237.78.8
Percentage of OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherNonoperatingExpense

us-gaap:OtherNonoperatingExpense


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value101.9-0.40.42.53.3253.77.50.50.00.00.0
Percentage of OtherNonoperatingExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0

us-gaap:OtherNonoperatingExpense us-gaap:ConsolidatedEntities

srt:ParentCompany


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-1.00.22.62.6153.77.50.5
Percentage of OtherNonoperatingExpense250.050.0104.078.858.7100.0100.0100.0

srt:SubsidiaryIssuer


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.60.2-0.10.7100.10.00.0
Percentage of OtherNonoperatingExpense-150.050.0-4.021.241.32.70.00.0

us-gaap:PaymentsForLossesAndLossAdjustmentExpense

us-gaap:PaymentsForLossesAndLossAdjustmentExpense


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-312013-12-31
Value17226329824424033625025726625524621325921931019919718219715319516919217412871302
Percentage of PaymentsForLossesAndLossAdjustmentExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsForProceedsFromOtherInvestingActivities

us-gaap:PaymentsForProceedsFromOtherInvestingActivities


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
Value83-45.9-10.9-7.72.22.842-52.12.4203.9-20.325-8.913-12.131-3.610.0-32.8-13.3149.31.2-9.1-9.54.46.4-3.018-27.0-4.9-0.91.32.6-3.0-4.04.32.813-15.81.71.419-30.713
Percentage of PaymentsForProceedsFromOtherInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsForProceedsFromShortTermInvestments

us-gaap:PaymentsForProceedsFromShortTermInvestments


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
Value47-59.712-85.3-100.2-112.349067-29.4-38.385-33.5-85.4166-15.318-184.4-125.511565-41.154-116.02251-3.7-91.845-73.8446926445.2-137.57517-14.0-54.8-28.9-8.416-68.98293-170.6
Percentage of PaymentsForProceedsFromShortTermInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsOfDividendsPreferredStockAndPreferenceStock

us-gaap:PaymentsOfDividendsPreferredStockAndPreferenceStock


Payments
Period End2021-06-302021-03-312020-12-31
Value2700000.02600000.02600000.0
Percentage of PaymentsOfDividendsPreferredStockAndPreferenceStock100.0100.0100.0

us-gaap:PaymentsOfDividendsPreferredStockAndPreferenceStock us-gaap:ConsolidatedEntities

srt:ParentCompany


Payments
Period End2020-12-31
Value2600000.0
Percentage of PaymentsOfDividendsPreferredStockAndPreferenceStock100.0

us-gaap:PaymentsToAcquireAdditionalInterestInSubsidiaries us-gaap:ConsolidatedEntities

us-gaap:PaymentsToAcquireAdditionalInterestInSubsidiaries

srt:ParentCompany


Payments
Period End2020-12-31
Value0.0
Percentage of PaymentsToAcquireAdditionalInterestInSubsidiaries0.0

us-gaap:PaymentsToAcquireAdditionalInterestInSubsidiaries us-gaap:ConsolidationItems

srt:ConsolidationEliminations


Payments
Period End2020-12-31
Value0.0
Percentage of PaymentsToAcquireAdditionalInterestInSubsidiaries0.0

us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesDebt

us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesDebt


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
Value3656173785552728313246465293581495496216165475357806014865317293895393953935143344784282905584314553783543653364454064154023812933185311028
Percentage of PaymentsToAcquireAvailableForSaleSecuritiesDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireOtherInvestments

us-gaap:PaymentsToAcquireOtherInvestments


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
Value102011108.45.99.11625138.4101210138.47.59.36.013433310.05.538229915259.41.7422.3262.91.53.57.7210.3501.46.82.3150.2
Percentage of PaymentsToAcquireOtherInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PreferredStockDividendRatePercentage us-gaap:StatementClassOfStock, us-gaap:SubsequentEventType

us-gaap:PreferredStockDividendRatePercentage

us-gaap:SeriesAPreferredStock, us-gaap:SubsequentEvent


Preferred
Period End2020-07-09
Value0.07
Percentage of PreferredStockDividendRatePercentage100.0

us-gaap:PreferredStockDividendsPerShareDeclared us-gaap:StatementClassOfStock

us-gaap:PreferredStockDividendsPerShareDeclared

us-gaap:SeriesAPreferredStock


Preferred
Period End2021-05-062021-02-122020-08-07
Value437.5437.5330.56
Percentage of PreferredStockDividendsPerShareDeclared100.0100.0100.0

us-gaap:PremiumReceivableCreditLossExpenseReversal

us-gaap:PremiumReceivableCreditLossExpenseReversal


Premium
Period End2021-06-302021-03-312020-12-31
Value100000.0-200000.02600000.0
Percentage of PremiumReceivableCreditLossExpenseReversal100.0100.0100.0

us-gaap:PremiumsReceivableAllowanceForDoubtfulAccountsWriteOffsAgainstAllowance

us-gaap:PremiumsReceivableAllowanceForDoubtfulAccountsWriteOffsAgainstAllowance


Premiums
Period End2021-06-302021-03-31
Value100000.0500000.0
Percentage of PremiumsReceivableAllowanceForDoubtfulAccountsWriteOffsAgainstAllowance100.0100.0

us-gaap:ProceedsFromContributedCapital dei:LegalEntity

us-gaap:ProceedsFromContributedCapital

argo:OtherSubsidiariesAndEliminations


Proceeds
Period End2020-12-31
Value0.0
Percentage of ProceedsFromContributedCapital0.0

us-gaap:ProceedsFromContributedCapital us-gaap:ConsolidationItems

srt:ConsolidationEliminations


Proceeds
Period End2020-12-31
Value0.0
Percentage of ProceedsFromContributedCapital0.0

us-gaap:ProceedsFromIncomeTaxRefunds

us-gaap:ProceedsFromIncomeTaxRefunds


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312012-09-302011-09-302010-09-30
Value0100000.0200000.0900000.0700000.000100000.0000000100000.0200000.002200000.0000
Percentage of ProceedsFromIncomeTaxRefunds0.0100.0100.0100.0100.00.00.0100.00.00.00.00.00.00.0100.0100.00.0100.00.00.00.0

us-gaap:ProceedsFromIssuanceOfPreferredStockAndPreferenceStock

us-gaap:ProceedsFromIssuanceOfPreferredStockAndPreferenceStock


Proceeds
Period End2020-12-31
Value0.0
Percentage of ProceedsFromIssuanceOfPreferredStockAndPreferenceStock0.0

us-gaap:ProceedsFromIssuanceOfPreferredStockAndPreferenceStock us-gaap:ConsolidatedEntities

srt:ParentCompany


Proceeds
Period End2020-12-31
Value0.0
Percentage of ProceedsFromIssuanceOfPreferredStockAndPreferenceStock0.0

us-gaap:ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans

us-gaap:ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans


Proceeds
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
Value500000.0300000.0400000.0400000.0700000.0300000.0500000.0500000.0600000.0300000.0600000.0800000.00200000.0500000.0400000.0300000.0200000.0400000.0400000.0-100000.0300000.0300000.02900000.0-2300000.0900000.01300000.01000000.01500000.0800000.01200000.0-100000.0200000.01300000.0500000.0500000.0200000.00200000.0200000.0200000.0500000.02700000.0700000.0500000.0400000.0
Percentage of ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans us-gaap:ConsolidatedEntities

srt:ParentCompany


Proceeds
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value400000.0400000.0700000.0300000.0500000.0500000.0600000.0300000.0600000.0800000.0
Percentage of ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities


Proceeds
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
Value19819515915596158230123103654386143</