WRB


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:AwardType, us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

us-gaap:GainLossOnInvestments

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

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

us-gaap:IncomeTaxesPaidNet

us-gaap:InsuranceCommissionsAndFees

us-gaap:InterestExpense

us-gaap:NetIncomeLoss
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest

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

us-gaap:OperatingCostsAndExpenses

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossNetOfTax
us-gaap:StatementEquityComponents

us-gaap:OtherIncome

us-gaap:PolicyholderBenefitsAndClaimsIncurredNet

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

us-gaap:ProfitLoss
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents

us-gaap:RealizedInvestmentGainsLosses

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax

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

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

us-gaap:Liabilities
us-gaap:ConsolidatedEntities

us-gaap:LiabilitiesAndStockholdersEquity
us-gaap:ConsolidatedEntities

us-gaap:StockholdersEquity
us-gaap:ConsolidatedEntities

us-gaap:CashAndCashEquivalentsAtCarryingValue
us-gaap:ConsolidatedEntities

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
us-gaap:ConsolidatedEntities

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

us-gaap:Goodwill
us-gaap:BalanceSheetLocation
us-gaap:IntangibleAssetsNetExcludingGoodwill

us-gaap:OperatingLeaseRightOfUseAsset
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:EquitySecuritiesFvNi
us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis, us-gaap:FinancialInstrument
us-gaap:FairValueByMeasurementFrequency

us-gaap:OtherAssets
us-gaap:ConsolidatedEntities

us-gaap:TaxesPayableCurrent
us-gaap:ConsolidatedEntities
us-gaap:DebtInstrument
us-gaap:LongTermDebt
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType

us-gaap:DeferredIncomeTaxLiabilitiesNet
us-gaap:ConsolidatedEntities

us-gaap:MinorityInterest

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:OperatingLeaseLiability

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:StockholdersEquity
us-gaap:ConsolidatedEntities

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
us-gaap:StatementEquityComponents

us-gaap:CommonStockValue

us-gaap:AdditionalPaidInCapitalCommonStock
us-gaap:ConsolidatedEntities

us-gaap:RetainedEarningsAccumulatedDeficit
us-gaap:ConsolidatedEntities

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax
us-gaap:ConsolidatedEntities

us-gaap:TreasuryStockValue
us-gaap:ConsolidatedEntities

us-gaap:MinorityInterest

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetIncomeLoss
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:ProfitLoss
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents

us-gaap:ShareBasedCompensation

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:PaymentsToAcquireRealEstate

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:PaymentsOfDividendsCommonStock
us-gaap:StatementEquityComponents
us-gaap:Dividends

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:DeferredTaxLiabilities

us-gaap:DeferredTaxAssetsNet

us-gaap:DeferredTaxAssetsValuationAllowance
us-gaap:StatementEquityComponents
us-gaap:AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition

us-gaap:AllocatedShareBasedCompensationExpenseNetOfTax

us-gaap:AssumedPremiumsEarned

us-gaap:AssumedPremiumsWritten

us-gaap:CededPremiumsEarned

us-gaap:CededPremiumsWritten
us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded
us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal
us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold
us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesHeldToMaturityCreditLossExpenseReversal

us-gaap:DepreciationAndAmortization

us-gaap:DirectPremiumsEarned

us-gaap:DirectPremiumsWritten

us-gaap:EffectOfExchangeRateOnCashAndCashEquivalents

us-gaap:EquityMethodInvestmentRealizedGainLossOnDisposal
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease

us-gaap:GainLossOnSaleOfOtherInvestments

us-gaap:GainLossOnSalesOfLoansNet

us-gaap:IncomeLossFromEquityMethodInvestments
us-gaap:InvestmentType

us-gaap:IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions

us-gaap:IncreaseDecreaseInBrokerDealerRelatedReceivablesPayablesNet

us-gaap:IncreaseDecreaseInDeferredIncomeTaxes

us-gaap:IncreaseDecreaseInDeferredPolicyAcquisitionCosts

us-gaap:IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve

us-gaap:IncreaseDecreaseInOtherOperatingLiabilities

us-gaap:IncreaseDecreaseInPremiumsReceivable

us-gaap:IncreaseDecreaseInReinsuranceRecoverable

us-gaap:IncreaseDecreaseInTradingSecurities

us-gaap:IncreaseDecreaseInUnearnedPremiums

us-gaap:IncreaseDecreaseInUnearnedPremiumsNet

us-gaap:InterestPaid

us-gaap:InvestmentIncomeInterestAndDividend
us-gaap:InvestmentType

us-gaap:InvestmentIncomeInvestmentExpense
us-gaap:InvestmentType
us-gaap:InvestmentIncomeNet

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1

us-gaap:MarketableSecuritiesGainLoss

us-gaap:MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents
us-gaap:NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance

us-gaap:OperatingLeaseCost

us-gaap:OperatingLeasePayments
us-gaap:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToNoncontrollingInterest

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax
us-gaap:FinancialInstrument
us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
us-gaap:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax
us-gaap:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax

us-gaap:OtherComprehensiveIncomeLossBeforeTax
us-gaap:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax

us-gaap:OtherComprehensiveIncomeLossTax

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
us-gaap:StatementEquityComponents

us-gaap:OtherCostAndExpenseOperating

us-gaap:PaymentsForLossesAndLossAdjustmentExpense

us-gaap:PaymentsForProceedsFromLoansReceivable

us-gaap:PaymentsForProceedsFromOtherInvestingActivities

us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesDebt

us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesEquity

us-gaap:PremiumReceivableCreditLossExpenseReversal

us-gaap:PremiumsWrittenNet

us-gaap:ProceedsFromIssuanceOfDebt

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities

us-gaap:ProceedsFromRepaymentsOfDebt

us-gaap:ProceedsFromSaleOfAvailableForSaleSecuritiesDebt

us-gaap:ProceedsFromSaleOfAvailableForSaleSecuritiesEquity

us-gaap:ProvisionForLoanLossesExpensed
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:StatementEquityComponents
us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax

us-gaap:ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded

us-gaap:ReinsuranceRecoverableCreditLossExpenseReversal

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense
us-gaap:StatementEquityComponents
us-gaap:TreasuryStockValueAcquiredCostMethod

us-gaap:UnrealizedGainLossOnInvestments
us-gaap:StatementEquityComponents
wrb:AdjustmentstoAdditionalPaidinCapitalStockIssuedDuringPeriodValueStockOptionsExercisedValueRestrictedStockIssuedNetofTaxBenefitExpense

wrb:AvailableforSaleandHeldtoMaturityRealizedGainsDebtSecuritiesExcludingOtherthanTemporaryImpairmentsandAllowances

wrb:AvailableforSaleandHeldtoMaturityRealizedLossesDebtSecuritiesExcludingOtherthanTemporaryImpairmentsandAllowances

wrb:AvailableforsaleSecuritiesGrossRealizedGainLossEquitySecuritiesExcludingOtherthanTemporaryImpairments

wrb:ChangeinUnrealizedGainlossonInvestmentsIncludingPortionAttributabletoNoncontrollingInterest

wrb:ChangeinUnrealizedGainlossonInvestmentsIncludingPortionAttributabletoNoncontrollingInterestNetofTax

wrb:ChangeinUnrealizedGainlossonInvestmentstax

wrb:DebtSecuritiesAllowanceforCreditLossPeriodIncreaseDecrease

wrb:ExpensesFromWhollyOwnedInvestees
us-gaap:StatementBusinessSegments
wrb:FavorableReserveDevelopmentNetOfPremiumOffsets

wrb:IncomeBeforeIncomeTaxes
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

wrb:InvestmentsAllowanceforCreditLossPeriodIncreaseDecrease

wrb:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsUndiscountedBasisPriorYearsIncreaseDecrease

wrb:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredLossReserveDiscountAccretion

wrb:LiabilityforUnpaidClaimsandClaimsAdjustmentExpenseForeignExchangeTranslation

wrb:LiabilityforUnpaidClaimsandClaimsAdjustmentExpenseIncurredClaimsAdjustment

wrb:MarketableSecuritiesRealizedGainLossExcludingOtherthanTemporaryImpairmentsNetofTax

wrb:OperatingLeaseRightOfUseAssetAccumulatedDepreciation
us-gaap:StatementEquityComponents
wrb:OtherComprehensiveIncomeLossSecuritiesAvailableforSaleWithAllowanceforCreditLossUnrealizedHoldingGainLossArisingDuringPeriodafterTax

wrb:OtherRevenues
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

wrb:PaymentForStockOptionsExercisedNet

wrb:PaymentsForProceedsFromRealEstate

wrb:PaymentstoAcquirePropertyPlantandEquipmentNet

wrb:ProceedsFromPaymentsToEquityMethodInvestments

wrb:RealEstateRealizedGainLossOnDisposal

wrb:RealizedGainLossonInvestmentsIncludingEquityMethodInvestmentsExcludingOtherthanTemporaryImpairmentsandAllowances

wrb:RealizedGainLossonMarketableSecuritiesEquityMethodInvestmentsandOtherInvestmentsBeforeTax

wrb:RealizedGainLossonMarketableSecuritiesEquityMethodInvestmentsandOtherInvestmentsNetofTax

wrb:RealizedGainLossonMarketableSecuritiesEquityMethodInvestmentsandOtherInvestmentsTax

wrb:RevenuesFromWhollyOwnedInvestees

wrb:RightOfUseAssetsReducedObtainedInExchangeForNewLeaseLiabilities
us-gaap:AwardType
wrb:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodFairValue

wrb:UnfavorableReserveDevelopmentNetOfPremiumOffsets
us-gaap:StatementBusinessSegments

us-gaap:AccruedInvestmentIncomeReceivable
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:AssetsFairValueDisclosure
us-gaap:FairValueByMeasurementFrequency

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis
us-gaap:ConsolidatedEntities
us-gaap:FinancialInstrument
us-gaap:FairValueByMeasurementBasis
us-gaap:AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax
us-gaap:FairValueByMeasurementBasis, us-gaap:FinancialInstrument
us-gaap:FairValueByMeasurementBasis
us-gaap:AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax
us-gaap:FairValueByMeasurementBasis, us-gaap:FinancialInstrument
us-gaap:FairValueByMeasurementBasis
us-gaap:AvailableForSaleEquitySecuritiesAmortizedCostBasis
us-gaap:FairValueByMeasurementBasis, us-gaap:FinancialInstrument
us-gaap:FairValueByMeasurementBasis
us-gaap:AvailableForSaleSecurities
us-gaap:FinancialInstrument
us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
us-gaap:FinancialInstrument, us-gaap:InvestmentSecondaryCategorization
us-gaap:InvestmentSecondaryCategorization
us-gaap:FinancialInstrument
us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
us-gaap:FinancialInstrument
us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue

us-gaap:AvailableForSaleSecuritiesDebtSecurities
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementFrequency
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleSecuritiesEquitySecurities
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis, us-gaap:FinancialInstrument
us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementBasis
us-gaap:CashAndCashEquivalentsFairValueDisclosure
us-gaap:LongtermDebtType
us-gaap:DebtInstrumentFaceAmount

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLoss
us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesAvailableForSaleAndHeldToMaturity
us-gaap:ConsolidatedEntities

us-gaap:DebtSecuritiesHeldToMaturityAllowanceForCreditLoss
us-gaap:FinancialInstrument

us-gaap:DeferredIncomeTaxAssetsNet

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredPolicyAcquisitionCosts

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards
us-gaap:IncomeTaxAuthority
us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration
us-gaap:IncomeTaxAuthority
us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsUnearnedPremiumsReserve

us-gaap:DeferredTaxLiabilitiesDeferredExpenseDeferredPolicyAcquisitionCost

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets

us-gaap:DeferredTaxLiabilitiesInvestments

us-gaap:DeferredTaxLiabilitiesOther

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment

us-gaap:DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities

us-gaap:DepositContractsLiabilities
us-gaap:DerivativeInstrumentRisk, us-gaap:Position
us-gaap:DerivativeFairValueOfDerivativeNet
us-gaap:DerivativeInstrumentRisk, us-gaap:Position
us-gaap:DerivativeNotionalAmount

us-gaap:DevelopmentInProcess
us-gaap:ConsolidatedEntities
us-gaap:DueToAffiliateCurrentAndNoncurrent

us-gaap:EquityMethodInvestments
us-gaap:InvestmentType
us-gaap:FairValueByMeasurementBasis
us-gaap:EquitySecuritiesFvNiCost
us-gaap:FairValueByMeasurementBasis, us-gaap:FinancialInstrument
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FinancialInstrumentsSoldNotYetPurchasedAtFairValue
us-gaap:FairValueByMeasurementFrequency

us-gaap:FinancingReceivableAllowanceForCreditLosses
us-gaap:FinancingReceivablePortfolioSegment

us-gaap:FinancingReceivableRecordedInvestmentNonaccrualStatus

us-gaap:HeldToMaturitySecurities
us-gaap:FinancialInstrument

us-gaap:HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain
us-gaap:FinancialInstrument

us-gaap:HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment
us-gaap:FinancialInstrument

us-gaap:HeldToMaturitySecuritiesFairValue
us-gaap:FinancialInstrument

us-gaap:HeldToMaturitySecuritiesRestricted
us-gaap:FinancialInstrument
us-gaap:StatementBusinessSegments

us-gaap:IncomeTaxReceivable

us-gaap:IncomeTaxesReceivable

us-gaap:Investments

us-gaap:JuniorSubordinatedNotes
us-gaap:ConsolidatedEntities

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear

us-gaap:LessorOperatingLeasePaymentsToBeReceivedFiveYears

us-gaap:LessorOperatingLeasePaymentsToBeReceivedFourYears

us-gaap:LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths

us-gaap:LessorOperatingLeasePaymentsToBeReceivedRemainderOfFiscalYear

us-gaap:LessorOperatingLeasePaymentsToBeReceivedThereafter

us-gaap:LessorOperatingLeasePaymentsToBeReceivedThreeYears

us-gaap:LessorOperatingLeasePaymentsToBeReceivedTwoYears
us-gaap:StatementBusinessSegments
us-gaap:LettersOfCreditOutstandingAmount

us-gaap:LiabilityForAsbestosAndEnvironmentalClaimsNet

us-gaap:LiabilityForClaimsAndClaimsAdjustmentExpense

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet
us-gaap:CumulativeEffectPeriodOfAdoption
wrb:CumulativeEffectPeriodOfAdoption

us-gaap:LoansAndLeasesReceivableGrossCarryingAmount
us-gaap:ConsolidatedEntities
us-gaap:FinancingReceivablePortfolioSegment

us-gaap:LoansReceivableFairValueDisclosure
us-gaap:FairValueByMeasurementBasis
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FairValueByMeasurementBasis
us-gaap:LongTermDebtFairValue
us-gaap:DebtInstrument
us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
us-gaap:DebtInstrument
us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo

us-gaap:MortgageLoansOnRealEstateCommercialAndConsumerNet
us-gaap:FinancingReceivablePortfolioSegment

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent

us-gaap:OperatingLeasesFutureMinimumPaymentsReceivableCurrent

us-gaap:OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears

us-gaap:OperatingLeasesFutureMinimumPaymentsReceivableInFourYears

us-gaap:OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears

us-gaap:OperatingLeasesFutureMinimumPaymentsReceivableInTwoYears

us-gaap:OperatingLeasesFutureMinimumPaymentsReceivableThereafter

us-gaap:OtherLiabilities
us-gaap:ConsolidatedEntities

us-gaap:PremiumsAndOtherReceivablesNet

us-gaap:PremiumsReceivableAllowanceForDoubtfulAccounts

us-gaap:PrepaidReinsurancePremiums

us-gaap:RealEstateInvestmentPropertyAccumulatedDepreciation

us-gaap:RealEstateInvestmentPropertyNet

us-gaap:RealEstateInvestments

us-gaap:ReceivablesFromBrokersDealersAndClearingOrganizations

us-gaap:ReinsurancePayable

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

us-gaap:ReinsuranceRecoverables
us-gaap:CededCreditRisk

us-gaap:ReinsuranceRecoverablesAllowance

us-gaap:ReinsuranceRecoverablesGross

us-gaap:ReinsuranceRecoverablesOnPaidAndUnpaidLosses
us-gaap:ConsolidatedEntities
us-gaap:SeniorNotes

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

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

us-gaap:StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithoutRegulatoryApproval

us-gaap:StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersDeferredPolicyAcquisitionCosts

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersReservesForUnpaidClaimsAndClaimsAdjustmentExpense

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersUnearnedPremiums

us-gaap:SupplementaryInsuranceInformationDeferredPolicyAcquisitionCosts
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:SupplementaryInsuranceInformationLiabilityForFuturePolicyBenefitsLossesClaimsAndLossExpenseReserves
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:SupplementaryInsuranceInformationUnearnedPremiums
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:TaxCreditCarryforwardValuationAllowance

us-gaap:TradingLiabilities
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:TradingLiabilitiesFairValueDisclosure
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementFrequency

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

us-gaap:UndistributedEarningsOfForeignSubsidiaries

us-gaap:UnearnedPremiums
us-gaap:ValuationAllowancesAndReservesType
us-gaap:ValuationAllowancesAndReservesBalance

us-gaap:VariableInterestEntityEntityMaximumLossExposureAmount

us-gaap:WorkersCompensationDiscountAmount
us-gaap:StatementBusinessSegments
us-gaap:ConsolidatedEntities
wrb:AccumulatedUndistributedNetIncomeOfSubsidiaries
us-gaap:FinancialInstrument, us-gaap:InvestmentSecondaryCategorization
wrb:AvailableForSaleEquitySecuritiesContinuousUnrealizedLossPositionAggregateLoss
us-gaap:InvestmentSecondaryCategorization

wrb:AvailableForSaleSecuritiesDebtSecuritiesFairValue
us-gaap:FinancialInstrument

wrb:AvailableForSaleSecuritiesDebtSecuritiesGrossUnrealizedGain
us-gaap:FinancialInstrument

wrb:AvailableForSaleSecuritiesDebtSecuritiesGrossUnrealizedLosses
us-gaap:FinancialInstrument

wrb:BuildingandLeaseObligations

wrb:DebtSecuritiesAllowanceforCreditLoss

wrb:DebtSecuritiesAvailableforsaleandHeldtomaturityAmortizedCost

wrb:DebtSecuritiesAvailableforsaleandHeldtomaturityAmortizedCostNet
us-gaap:ExternalCreditRatingByGrouping, us-gaap:FinancialInstrument
wrb:DebtSecuritiesAvailableforsaleandHeldtomaturityContinuousUnrealizedLossPosition12MonthsorLonger
us-gaap:ExternalCreditRatingByGrouping, us-gaap:FinancialInstrument
wrb:DebtSecuritiesAvailableforsaleandHeldtomaturityContinuousUnrealizedLossPosition12MonthsorLongerAccumulatedLoss
us-gaap:FinancialInstrument
us-gaap:ExternalCreditRatingByGrouping, us-gaap:FinancialInstrument
wrb:DebtSecuritiesAvailableforsaleandHeldtomaturityContinuousUnrealizedLossPositionLessthan12Months
us-gaap:ExternalCreditRatingByGrouping, us-gaap:FinancialInstrument
wrb:DebtSecuritiesAvailableforsaleandHeldtomaturityContinuousUnrealizedLossPositionLessthan12MonthsAccumulatedLoss
us-gaap:FinancialInstrument

wrb:DebtSecuritiesAvailableforsaleandHeldtomaturityFairValue

wrb:DebtSecuritiesAvailableforsaleandHeldtomaturityGrossUnrealizedGains

wrb:DebtSecuritiesAvailableforsaleandHeldtomaturityGrossUnrealizedLosses
us-gaap:ExternalCreditRatingByGrouping, us-gaap:FinancialInstrument
wrb:DebtSecuritiesAvailableforsaleandHeldtomaturityUnrealizedLossPosition
us-gaap:ExternalCreditRatingByGrouping, us-gaap:FinancialInstrument
wrb:DebtSecuritiesAvailableforsaleandHeldtomaturityUnrealizedLossPositionAccumulatedLoss
us-gaap:FinancialInstrument
us-gaap:DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensation
wrb:DeferredCompensationArrangementwithIndividualUnitAwardsEarnedInPeriodValue
us-gaap:FairValueByMeasurementBasis
wrb:DueFromBroker
us-gaap:FairValueByMeasurementBasis
wrb:DueFromBrokerFairValue
us-gaap:FairValueByMeasurementBasis
wrb:DueFromBrokersFairValueDisclosure
us-gaap:FairValueByMeasurementBasis
wrb:DueToBrokerFairValue

wrb:IncreaseDecreaseInEarnedUnbilledAuditPremiums

wrb:LesseeOperatingLeaseLiabilityToBePaidDueAfterYearFour

wrb:LessorOperatingLeasePaymentstobeReceivedSixYears
us-gaap:StatementBusinessSegments
wrb:LiabilityForClaimsAndClaimsAdjustmentExpenseNetOfReinsuranceCurrentAccidentYearLosses

wrb:LiabilityForClaimsAndClaimsAdjustmentExpenseNetOfReinsuranceIncurredButNotReportedIBNRClaimsAmount

wrb:LiabilityForClaimsAndClaimsAdjustmentExpenseNetOfReinsuranceReportedClaimsAmount

wrb:LiabilityforClaimsandClaimsAdjustmentExpenseNetOfReinsurance
us-gaap:StatementBusinessSegments
us-gaap:DebtInstrument
wrb:LongtermDebtMaturitiesRepaymentsofPrincipalafterYearThree

wrb:MarketableSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost

wrb:MarketableSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue
us-gaap:FairValueByMeasurementBasis
wrb:MarketableSecuritiesFairValueDisclosure

wrb:MarketableSecuritiesFixedMaturitiesAfterFiveThroughTenYearsAmortizedCost

wrb:MarketableSecuritiesFixedMaturitiesAfterFiveThroughTenYearsFairValue

wrb:MarketableSecuritiesFixedMaturitiesAfterOneThroughFiveYearsAmortizedCost

wrb:MarketableSecuritiesFixedMaturitiesAfterOneThroughFiveYearsFairValue

wrb:MarketableSecuritiesFixedMaturitiesAfterTenYearsAmortizedCost

wrb:MarketableSecuritiesFixedMaturitiesAfterTenYearsFairValue

wrb:MarketableSecuritiesFixedMaturitiesAmortizedCost

wrb:MarketableSecuritiesFixedMaturitiesFairValue

wrb:MarketableSecuritiesFixedMaturitiesWithinOneYearAmortizedCost

wrb:MarketableSecuritiesFixedMaturitiesWithinOneYearFairValue

wrb:NonconsolidatedLegalEntityUnfundedCommitments

wrb:SeniorNotesAndOtherDebt
us-gaap:AwardType
wrb:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsUnearnedCompensationExpense

wrb:StatutoryAccountingPracticesStatutoryCapitalandSurplusAdjustedCapitalBalance

wrb:StatutoryAccountingPracticesStatutoryCapitalandSurplusAdjustedCapitalBalancePercent

wrb:StatutoryAccountingPracticesStatutoryCapitalandSurplusTotalIncreaseDecreaseEffectonBalance

wrb:TaxCutsandJobsActIncompleteAccountingDeferredTaxLiabilitiesProvisionalUndistributedForeignEarnings
us-gaap:FairValueByMeasurementBasis
wrb:TradingAccountsReceivableFromBrokersFairValueDisclosure

wrb:WorkersCompensationDiscountAfterEffectsOfCededReinsuranceAmount

Plots across concepts


IncomeStatement
Other Comprehensive Income Loss Net Of Tax
Expenses
Interest Expense
Balance Sheet
Operating Lease Right Of Use Asset
Assets
Operating Lease Right Of Use Asset
Current Assets
Cash And Cash Equivalents At Carrying Value
NonCurrent Assets
Deferred Income Tax Assets Net
Liabilities
Operating Lease Liability
Stockholders Equity
Accumulated Other Comprehensive Income Loss Net Of Tax
CashFlow
Net Cash Provided By Used In Financing Activities
NetCashProvidedByUsedInOperatingActivities
Share Based Compensation
NetCashProvidedByUsedInInvestingActivities
Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInFinancingActivities
Net Cash Provided By Used In Financing Activities
Shares
Weighted Average Number Of Shares Outstanding Basic
DividendsAndRepurchase
Payments For Repurchase Of Common Stock
LesseeOperatingLeaseLiabilityPaymentsDue
Lessee Operating Lease Liability Payments Remainder Of Fiscal Year

Tables

  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
us-gaap:CommonStockValue ██████████▁▁▁▁70.53570.53570.53570.53570.53570.53570.53570.53570.53570.53547.02447.02447.02447.024
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding █▁187.106186.83NA187.717187.862190.287NA193.589193.059192.669NA128.561128.339128.125
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic ▁█185.155185.195NA185.765185.979190.287NA190.862190.512190.4NA126.827126.517126.375
us-gaap:EarningsPerShareBasic ▆▆█▄▃▁▄▅▆▅▅▆▇▇1.281.241.670.820.38-0.020.620.871.140.951.041.281.421.32
us-gaap:EarningsPerShareDiluted ▆▆█▄▃▁▄▅▆▅▅▆▇▆1.271.231.66000000000000010.810.38-0.020.620.851.120.941.031.261.41.3
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
us-gaap:ComprehensiveIncomeNetOfTax ▇▆█▆█▁▆▅▇▇▅▅▅▅263.048143.445420.864230.148411.433-361.594184.111103.658320.836326.30396.91782.82443.21553.412
us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest ▂▅▁▂▂▂▂▁▂▂█▅▂▃0.4392.1910.340.6850.3950.8930.4850.0660.7480.8453.9552.4630.6661.188
us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest ▇▆█▆█▁▆▅▇▇▅▅▅▅263.487145.636421.204230.833411.828-360.701184.596103.724321.584327.148100.87285.28743.88154.6
us-gaap:GainLossOnInvestments ▅▅█▅▆▁▄▅▆▆▅▅▆▆24.06434.839163.31138.97877.885-177.174-22.9881.46573.57468.65314.05922.33469.63148.464
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest ▆▆█▅▃▁▄▅▆▅▄▅▅▅299.94296.068399.407206.414105.449-6.468146.763202.982273.736229.439162.639209.223229.242210.99
us-gaap:IncomeTaxExpenseBenefit ▆▆█▅▄▁▃▄▆▅▃▅▅▅62.26264.35286.91754.04833.793-2.94226.9737.83156.30947.82526.36744.7848.46443.417
us-gaap:IncomeTaxesPaidNet NANANA96.00.00.0NA44.48282.80.0NA62.0111.00.0
us-gaap:InsuranceCommissionsAndFees ▃▅▂▂▁▅▂▃▃▄▅█▇█22.25625.80821.52121.63519.8725.75121.2423.68122.44625.31226.58230.78229.71930.675
us-gaap:InterestExpense ▅▄▃▇▆▄▁▆███▇▇▄38.09636.65135.66339.76838.37336.73433.49638.47540.71840.72140.57739.84839.70537.056
us-gaap:NetIncomeLoss ▆▆█▄▃▁▄▅▆▅▄▅▅▅237.238229.525312.15151.67871.26-4.418119.306165.208216.709180.722132.357161.92180.075166.396
us-gaap:NetIncomeLossAttributableToNoncontrollingInterest ▂▅▂▂▂▃▂▁▂▃█▆▂▃0.442.1910.340.6880.3960.8920.487-0.0570.7180.8923.9152.5230.7031.177
us-gaap:NetInvestmentIncome ▇▆▇▅▁▇▅▆█▆▆█▆▇168.187158.577180.977142.6585.431174.763137.335161.692188.333158.254159.816186.124153.777174.518
us-gaap:OperatingCostsAndExpenses █▅▆▄▄▄▄▃▃▂▃▂▁▁1996.1461860.8011913.0641833.4051830.5771817.0781829.3111762.7341749.6481707.5831788.9461728.6791681.6741680.257
us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax ▅▅█▇▆▁█▄▅▆▄▆▁▆2.5374.0566.4840.19421.447-98.19468.58-36.682-14.49219.76-36.12915.686-104.45512.799
us-gaap:OtherComprehensiveIncomeLossNetOfTax ▅▄▆▅█▁▅▄▆▆▄▄▃▃25.809-86.08108.71478.467340.172-357.17564.803-61.427104.157145.534-35.4-79.156-136.897-112.973
us-gaap:OtherIncome ▃▂▁▁▁▆▁▁█▁▂▁▁▁0.8330.2590.150.140.1832.1230.170.1882.8930.120.6220.0090.0380.011
us-gaap:PolicyholderBenefitsAndClaimsIncurredNet █▆▅▅▆▅▄▃▃▂▃▃▁▁1203.6471121.5921111.6951114.6321135.1261107.2531072.1661041.4711028.83988.651020.1271017.72973.636963.219
us-gaap:PremiumsEarnedNet █▆▅▄▃▃▄▃▂▁▂▂▁▁1971.6241849.9561813.591748.9211676.9151691.4181716.7811676.811646.8411592.8561619.5581603.4851581.0531567.408
us-gaap:ProfitLoss ▆▆█▄▃▁▄▅▆▅▄▅▅▅237.678231.716312.49152.36671.656-3.526119.793165.151217.427181.614136.272164.443180.778167.573
us-gaap:RealizedInvestmentGainsLosses ▁█24.06434.839NA38.97877.885-177.174NA1.46573.57368.653NA22.33469.63148.464
us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax █▇▇▅▄▄▆▃▂▂▁▂▁▁106.834101.68102.51189.10485.59381.04594.08176.00173.09271.01766.82168.93865.92266.356
us-gaap:Revenues █▆█▄▃▁▃▃▄▃▃▃▂▂2296.0862156.8692312.4712039.8191936.0261810.611976.0741965.7162023.3841937.0221951.5861937.9021910.9161891.247
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
us-gaap:Assets █▇▆▅▄▃▄▃▃▂▁▁▁▁30297.91729791.27428606.91328212.3727323.29226089.92926643.42826218.51126487.90325585.2624895.97724855.64924621.14424587.832
us-gaap:Liabilities █▇▆▆▅▃▃▃▃▂▁▁▁▁23709.96323360.9922281.11622172.69821477.90120552.38520525.08620119.06820467.82519782.46419416.17919376.61619155.51619095.652
us-gaap:LiabilitiesAndStockholdersEquity █▇▆▅▄▃▄▃▃▂▁▁▁▁30297.91729791.27428606.91328212.3727323.29226089.92926643.42826218.51126487.90325585.2624895.97724855.64924621.14424587.832
us-gaap:StockholdersEquity █▇▆▄▃▁▅▅▄▃▁▁▁▁6578.2766414.66310.8025995.1125801.1165493.4756074.9396056.2965976.765759.9525437.8515437.8485426.1185451.776
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
us-gaap:CashAndCashEquivalentsAtCarryingValue ▅▆▇█▇▂▂▁▃▁▁▁▁▂1790.1992014.9112372.3662571.4472430.826965.0121023.71812.551258.174937.428817.602819.366911.202956.603
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents ▅▆▇█▇▂▂▁▃▁▁▁▁▂1790.1992014.9112372.3662571.4472430.826965.0121023.71812.551258.174937.428817.602819.366911.202956.603
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
us-gaap:PropertyPlantAndEquipmentNet █▂▃▄▅▆▆▅▁▃▅▇█▇428.723404.281405.93410.228414.335422.012422.091416.966398.885406.841416.372424.754427.619424.751
 us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures us-gaap:ConsolidatedEntities srt:ParentCompanyNANA7957.501NANANA7623.639NANANA6786.999NANANA
us-gaap:Goodwill ▁▁▁▁▁▁▁▁▄▄▄▂██169.652169.652169.652169.652169.652169.652169.652169.652173.037173.037173.037171.095178.975178.945
 us-gaap:IntangibleAssetsNetExcludingGoodwill us-gaap:BalanceSheetLocation us-gaap:OtherAssetsNANA93.0NANANA99.0NANANA104.0NANANA
us-gaap:OperatingLeaseRightOfUseAsset ▁▂▃▅▆▆██▆▇148.455156.942164.476172.473180.011184.544193.311194.553179.984185.012NANANANA
 us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByAssetClass,us-gaap:FairValueByFairValueHierarchyLevel,us-gaap:FairValueByMeasurementFrequency us-gaap:CommonStock,us-gaap:FairValueInputsLevel1,us-gaap:FairValueMeasurementsRecurringNANA340.966NANANA157.752NANANA89.596NANANA
 us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByAssetClass,us-gaap:FairValueByFairValueHierarchyLevel,us-gaap:FairValueByMeasurementFrequency us-gaap:CommonStock,us-gaap:FairValueInputsLevel3,us-gaap:FairValueMeasurementsRecurringNANA9.215NANANA9.053NANANA8.596NANANA
 us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByAssetClass,us-gaap:FairValueByFairValueHierarchyLevel,us-gaap:FairValueByMeasurementFrequency us-gaap:PreferredStock,us-gaap:FairValueInputsLevel2,us-gaap:FairValueMeasurementsRecurringNANA266.155NANANA307.31NANANA176.869NANANA
 us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByAssetClass,us-gaap:FairValueByFairValueHierarchyLevel,us-gaap:FairValueByMeasurementFrequency us-gaap:PreferredStock,us-gaap:FairValueInputsLevel3,us-gaap:FairValueMeasurementsRecurringNANA9.331NANANA6.505NANANA3.945NANANA
 us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByAssetClass,us-gaap:FairValueByMeasurementFrequency us-gaap:CommonStock,us-gaap:FairValueMeasurementsRecurringNANA350.181NANANA166.805NANANA98.192NANANA
 us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByAssetClass,us-gaap:FairValueByMeasurementFrequency us-gaap:PreferredStock,us-gaap:FairValueMeasurementsRecurringNANA275.486NANANA313.815NANANA180.814NANANA
 us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByFairValueHierarchyLevel,us-gaap:FairValueByMeasurementFrequency us-gaap:FairValueInputsLevel1,us-gaap:FairValueMeasurementsRecurringNANA340.966NANANA157.752NANANA89.596NANANA
 us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByFairValueHierarchyLevel,us-gaap:FairValueByMeasurementFrequency us-gaap:FairValueInputsLevel2,us-gaap:FairValueMeasurementsRecurringNANA266.155NANANA307.31NANANA176.869NANANA
 us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByFairValueHierarchyLevel,us-gaap:FairValueByMeasurementFrequency us-gaap:FairValueInputsLevel3,us-gaap:FairValueMeasurementsRecurringNANA18.546NANANA15.558NANANA12.541NANANA
 us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByMeasurementBasis us-gaap:CarryingReportedAmountFairValueDisclosureNANA625.667NANANA480.62NANANA279.006NANANA
 us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByMeasurementBasis us-gaap:EstimateOfFairValueFairValueDisclosureNANA625.667NANANA480.62NANANA279.006NANANA
 us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByMeasurementBasis,us-gaap:FinancialInstrument us-gaap:CarryingReportedAmountFairValueDisclosure,us-gaap:CommonStockNANA350.181NANANA166.805NANANA98.192NANANA
 us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByMeasurementBasis,us-gaap:FinancialInstrument us-gaap:CarryingReportedAmountFairValueDisclosure,us-gaap:PreferredStockNANA275.486NANANA313.815NANANA180.814NANANA
 us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByMeasurementBasis,us-gaap:FinancialInstrument us-gaap:EstimateOfFairValueFairValueDisclosure,us-gaap:CommonStockNANA350.181NANANA166.805NANANA98.192NANANA
 us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByMeasurementBasis,us-gaap:FinancialInstrument us-gaap:EstimateOfFairValueFairValueDisclosure,us-gaap:PreferredStockNANA275.486NANANA313.815NANANA180.814NANANA
 us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByMeasurementFrequency us-gaap:FairValueMeasurementsRecurringNANA625.667NANANA480.62NANANA279.006NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
us-gaap:TaxesPayableCurrent NANA41.282NANANA10.006NANANANANANANA
 us-gaap:TaxesPayableCurrent us-gaap:ConsolidatedEntities srt:ParentCompanyNANA15.662NANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
 us-gaap:LongTermDebt us-gaap:DebtInstrument wrb:SubsidiaryDebtNANA110.987NANANA108.805NANANA123.992NANANA
 us-gaap:LongTermDebt us-gaap:DebtInstrument,us-gaap:LongtermDebtType wrb:SeniorNotesDueFebruary152037,us-gaap:SeniorNotesNANA248.226NANANA248.116NANANA248.006NANANA
 us-gaap:LongTermDebt us-gaap:DebtInstrument,us-gaap:LongtermDebtType wrb:SeniorNotesDueJanuary12022,us-gaap:SeniorNotesNANA76.419NANANA76.343NANANA76.273NANANA
 us-gaap:LongTermDebt us-gaap:DebtInstrument,us-gaap:LongtermDebtType wrb:SeniorNotesDueMaarch152022,us-gaap:SeniorNotesNANA349.505NANANA349.088NANANA348.67NANANA
 us-gaap:LongTermDebt us-gaap:DebtInstrument,us-gaap:LongtermDebtType wrb:SeniorNotesDueMay122050,us-gaap:SeniorNotesNANA492.236NANANANANANANANANANANA
 us-gaap:LongTermDebt us-gaap:DebtInstrument,us-gaap:LongtermDebtType wrb:SeniorNotesdueAugust12044,us-gaap:SeniorNotesNANA345.652NANANA345.467NANANA345.283NANANA
 us-gaap:LongTermDebt us-gaap:DebtInstrument,us-gaap:LongtermDebtType wrb:SubordinatedDebenturedueJune12056,us-gaap:SubordinatedDebtNANA282.003NANANA281.777NANANA281.551NANANA
 us-gaap:LongTermDebt us-gaap:DebtInstrument,us-gaap:LongtermDebtType wrb:SubordinatedDebenturedueMarch12056,us-gaap:SubordinatedDebtNANA106.365NANANA106.262NANANA106.159NANANA
 us-gaap:LongTermDebt us-gaap:DebtInstrument,us-gaap:LongtermDebtType wrb:SubordinatedDebtDueDecember302059,us-gaap:SubordinatedDebtNANA290.702NANANA290.464NANANA0.0NANANA
 us-gaap:LongTermDebt us-gaap:DebtInstrument,us-gaap:LongtermDebtType wrb:SubordinatedDebtDueMarch302058,us-gaap:SubordinatedDebtNANA179.006NANANA178.845NANANA178.684NANANA
 us-gaap:LongTermDebt us-gaap:DebtInstrument,us-gaap:LongtermDebtType wrb:SubordinatedDebtDueSeptember302060,us-gaap:SubordinatedDebtNANA244.233NANANANANANANANANANANA
 us-gaap:LongTermDebt us-gaap:LongtermDebtType us-gaap:SubordinatedDebtNANA1102.309NANANA1198.704NANANA907.491NANANA
 us-gaap:LongTermDebt us-gaap:LongtermDebtType wrb:SeniorNotesandOtherDebtNANA1623.025NANANA1427.575NANANA1882.028NANANA
us-gaap:DeferredIncomeTaxLiabilitiesNet NA76.66742.161NA10.9210.017.70615.27938.43743.2430.00.00.0NA
 us-gaap:DeferredIncomeTaxLiabilitiesNet us-gaap:ConsolidatedEntities srt:ParentCompanyNANA31.851NANANA22.846NANANA0.0NANANA
us-gaap:MinorityInterest ▁▂▂███████▇▇▇▇9.67815.68414.99544.5644.27544.06943.40343.14743.31842.84441.94741.18539.5140.404
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo ▁▄▃█39.08141.88741.44246.835NANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree ▁▅▅█32.46738.21837.84341.637NANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour ▁▅▅█23.22731.69431.28337.737NANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive NA22.88122.45231.439NANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive NA56.21758.12478.806NANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
us-gaap:StockholdersEquity █▇▆▄▃▁▅▅▄▃▁▁▁▁6578.2766414.66310.8025995.1125801.1165493.4756074.9396056.2965976.765759.9525437.8515437.8485426.1185451.776
us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest █▇▆▅▃▁▅▅▄▃▁▁▁▁6587.9546430.2846325.7976039.6725845.3915537.5446118.3426099.4436020.0785802.7965479.7985479.0335465.6285492.18
us-gaap:CommonStockValue ██████████▁▁▁▁70.53570.53570.53570.53570.53570.53570.53570.53570.53570.53547.02447.02447.02447.024
us-gaap:AdditionalPaidInCapitalCommonStock ▃▂▁▇█▇▆▅▆▆▇▆▆▆1035.1661023.5561012.4831064.7191076.0431063.0841056.0421045.4481058.4161053.3721063.1441058.0741060.3081057.23
us-gaap:RetainedEarningsAccumulatedDeficit █▇▆▅▄▄▄▄▄▃▂▂▂▁8682.0888556.6218348.3818057.5567927.287877.3717932.3727971.0197826.0157721.0397558.6197505.7067423.1627322.201
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▇▇█▇▆▁▅▅▅▄▂▃▄▅-122.444-148.252-62.172-170.886-249.35-589.521-257.299-322.1-260.796-364.983-510.47-474.938-395.842-258.982
 us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax us-gaap:ConsolidatedEntities srt:ParentCompanyNANA-62.172NANANA-257.299NANANA-510.47NANANA
us-gaap:TreasuryStockValue ██▇▇▇▅▂▁▁▁▁▁▁▁3087.0693087.863058.4253026.8123023.3922927.9942726.7112708.6062717.412720.0112720.4662698.0182708.5342715.697
us-gaap:MinorityInterest ▁▂▂███████▇▇▇▇9.67815.68414.99544.5644.27544.06943.40343.14743.31842.84441.94741.18539.5140.404
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities ▆▅▇█▆▃▅▆▅▂▅▄▃▁384.819310.99479.741557.094427.281152.57348.749392.398324.31678.33277.675223.162139.397-20.035
us-gaap:NetCashProvidedByUsedInInvestingActivities ▄▁▄▃█▅▄▄▅▅▄▄▅▅-206.411-1195.231-245.764-520.848855.48630.822-232.921-254.56720.82641.791-187.781-310.039-84.94-131.484
us-gaap:NetCashProvidedByUsedInFinancingActivities ▂█▂▅▆▃▅▁▅▅▄▅▄▆-404.247528.217-449.64398.975174.781-221.95686.001-575.344-22.874-0.976-99.117-22.666-43.03157.41
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect ▂▁▂▃█▂▃▁▄▃▃▂▂▃-224.712-357.455-199.081140.6211465.814-58.698211.16-445.624320.746119.826-1.764-91.836-45.4016.132
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities ▆▅▇█▆▃▅▆▅▂▅▄▃▁384.819310.99479.741557.094427.281152.57348.749392.398324.31678.33277.675223.162139.397-20.035
us-gaap:NetIncomeLoss ▆▆█▄▃▁▄▅▆▅▄▅▅▅237.238229.525312.15151.67871.26-4.418119.306165.208216.709180.722132.357161.92180.075166.396
us-gaap:ProfitLoss ▆▆█▄▃▁▄▅▆▅▄▅▅▅237.678231.716312.49152.36671.656-3.526119.793165.151217.427181.614136.272164.443180.778167.573
us-gaap:ShareBasedCompensation ▄▅▅▅▇▅▄▄▆█▁▂▃▂11.30511.81711.81612.11114.04811.68310.83411.112.51214.8288.0638.80610.2889.434
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
us-gaap:NetCashProvidedByUsedInInvestingActivities ▄▁▄▃█▅▄▄▅▅▄▄▅▅-206.411-1195.231-245.764-520.848855.48630.822-232.921-254.56720.82641.791-187.781-310.039-84.94-131.484
us-gaap:PaymentsToAcquireRealEstate NANANA12.2275.92924.249-29.78658.76564.87252.90159.65435.38982.42336.601
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
us-gaap:NetCashProvidedByUsedInFinancingActivities ▂█▂▅▆▃▅▁▅▅▄▅▄▆-404.247528.217-449.64398.975174.781-221.95686.001-575.344-22.874-0.976-99.117-22.666-43.03157.41
us-gaap:PaymentsOfDividendsCommonStock ▁▂▂▂▂▂█▅▂▁▇▂▃▂0.021.28521.32521.40221.35120.069178.156111.73318.3020.0158.8218.25860.85717.016
 us-gaap:Dividends us-gaap:StatementEquityComponents us-gaap:RetainedEarnings▆▁▁▁▁▁█▁▆▁▄▄▄▁111.77121.28521.32521.40221.35120.069157.95320.204111.73318.30279.44479.37679.11417.016
us-gaap:PaymentsForRepurchaseOfCommonStock ▁▂▂▁▄█▂▁▁▁▂▁▁▁0.029.68334.49812.95796.281202.62118.2250.00.00.017.9510.00.06.799
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31

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
Value7070707070707070707047474747474747474747474747474747474747474747474747474747474747474747
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 Assets0.20.20.20.30.30.30.30.30.30.30.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.30.30.30.30.30.3

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value187186187187190193193192128128128128128128128128128128129132133133135140141141141143143144147147154157
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value185185185185190190190190126126126125125121122122122123123125127127129135135136136138137138141141147151
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic us-gaap:AwardType, us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:RestrictedStockUnitsRSU, us-gaap:TrustForBenefitOfEmployees


Weighted
Period End2020-12-312019-12-312018-12-312017-03-31
Value7.7678747.5751684.9265214.847303
Percentage of WeightedAverageNumberOfSharesOutstandingBasic0.00.00.04.0

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
Value1.281.241.670.820.38-0.020.620.871.140.951.041.281.421.321.221.290.871.011.261.80.890.970.891.240.990.940.871.481.411.310.971.010.850.861.220.740.790.980.860.560.590.830.880.640.730.77
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted

us-gaap:EarningsPerShareDiluted


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1.271.231.660.810.38-0.020.620.851.120.941.031.261.41.31.211.260.850.961.21.720.850.930.851.180.950.890.831.421.351.250.930.970.820.831.170.710.760.940.820.530.560.790.850.610.70.74
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

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
Value263143420230411-361.59418410332032696824353771821721372211531581941494578620128254239102144-102.4179122192131173137721601036.52234175146
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 RevenueFromContractWithCustomerIncludingAssessedTax246.2141.10.0258.3480.7-446.20.0136.4438.9459.50.0120.165.680.50.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value439000.02191000.0340000.0685000.0395000.0893000.0485000.066000.0748000.0845000.03955000.02463000.0666000.01188000.0-1721000.0-731000.0-602000.0-1208000.0-887000.044000.056000.0-723000.0549000.0-35000.0-24000.0-115000.01350000.0-334000.0-235000.0-29000.05785000.0-1223000.0865000.023000.016000.0104000.071000.0-63000.0-38000.0-40000.04000.0-51000.038000.053000.019000.0177000.0
Percentage of ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.42.20.00.80.51.10.00.11.01.20.03.61.01.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value263145421230411-360.701184103321327100854354711831731382191531581951594578620128255239107145-103.27579122192132173136721601036.558234175147
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax246.6143.20.0259.1481.1-445.10.0136.5440.0460.70.0123.766.682.30.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Gain Loss On Investments

us-gaap:GainLossOnInvestments

us-gaap:GainLossOnInvestments


Gain
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value24341633877-177.174-22.9881.465736814226948591834052771756.3157.3435327191911622244752212229335.204115.912
Percentage of GainLossOnInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax22.534.30.043.791.0-218.60.01.9100.796.70.032.4105.673.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value299296399206105-6.468146202273229162209229210201226160184231331158174156228178168162278263247181198158160232133148
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax280.8291.20.0231.7123.2-8.00.0267.1374.5323.10.0303.5347.7318.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedOtherComprehensiveIncome


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value14115.898-1.538-21.257502.8840.22-1.7280.595-3.796-9.599-50.216-43.286-39.566-44.346-5.546-41.09-13.101-2.1346.4710.852-3.087-12.771-17.619-21.524-19.424-6.012-13.482-41.13-19.143-17.283
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest4.83.81.5-0.7-20.2-774.01.40.1-0.80.3-1.7-4.5-24.9-19.1-24.6-24.1-2.4-12.4-8.3-1.24.10.4-1.7-7.6-10.8-7.7-7.4-2.4-7.4-20.7-12.1-10.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax13.611.00.0-1.7-24.861.83.80.3-2.40.9-5.8-14.50.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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
Value6264865433-2.942263756472644484345635159-302.5931104954467655505189837746604343663239523220274448273541
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 RevenueFromContractWithCustomerIncludingAssessedTax58.363.30.060.739.5-3.60.049.877.067.30.065.073.565.40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value3.0442.3551.239-0.323-4.46410-2.4450.6060.046-0.3631.1480.125-0.797-2.016-17.576-15.15-13.84815-41.369144.5850.747-8.239-0.2981.08-4.47-7.254-8.621-7.886-2.422-6.474-15.3727.807-6.896
Percentage of IncomeTaxExpenseBenefit4.93.71.4-0.6-13.2-357.3-9.11.60.1-0.84.40.3-1.6-4.6-38.9-23.9-26.926.013.713.09.31.4-17.8-0.42.0-8.9-14.0-9.6-9.5-3.1-14.0-25.617.9-15.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax2.82.30.0-0.4-5.213.00.00.80.1-0.50.00.2-1.2-3.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedOtherComprehensiveIncome


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value3.0442.3551.239-0.323-4.46410-2.4450.6060.046-0.3631.1480.125-0.797-2.016-17.576-15.15-13.848-15.521-1.941-14.382-4.585-0.7472.2650.298-1.08-4.47-6.167-7.533-6.798-2.104-4.717-14.3966.831-5.918
Percentage of IncomeTaxExpenseBenefit4.93.71.4-0.6-13.2-357.3-9.11.60.1-0.84.40.3-1.6-4.6-38.9-23.9-26.9-26.00.6-13.0-9.3-1.44.90.4-2.0-8.9-11.9-8.4-8.2-2.7-10.2-24.015.7-13.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax2.82.30.0-0.4-5.213.00.00.80.1-0.50.00.2-1.2-3.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Income Taxes Paid Net

us-gaap:IncomeTaxesPaidNet

us-gaap:IncomeTaxesPaidNet


Income
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value960.00.044820.0621110.0371431.6112815.64442494.769851447.4939113231846643.2495.2035.281307.3342-14.276
Percentage of IncomeTaxesPaidNet100.00.00.0100.0100.00.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax107.70.00.058.5113.30.089.9168.40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Insurance Commissions And Fees

us-gaap:InsuranceCommissionsAndFees

us-gaap:InsuranceCommissionsAndFees


Insurance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value22252121192521232225263029303433333329323640313535363526262827262726262627232322252221222021
Percentage of InsuranceCommissionsAndFees100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax20.825.40.024.323.231.80.031.230.735.60.044.745.146.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Interest Expense

us-gaap:InterestExpense

us-gaap:InterestExpense


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value38363539383633384040403939373636363636373432313133343432303030303131323232282828282828262626
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 RevenueFromContractWithCustomerIncludingAssessedTax35.736.00.044.644.845.30.050.655.757.30.057.860.255.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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
Value23722931215171-4.418119165216180132161180166154162109123152220108119109152123118110188179169130136115116165100108135117778311612693110118
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 RevenueFromContractWithCustomerIncludingAssessedTax222.1225.70.0170.283.3-5.50.0217.4296.5254.50.0234.9273.2250.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:ConsolidationItems

srt:ConsolidationEliminations


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-71.209-52.606-57.781-47.823-33.755-37.184-62.519-55.032-45.862-47.917-65.17
Percentage of NetIncomeLoss-30.0-22.9-38.1-67.1764.0-22.5-28.8-30.5-28.3-26.6-39.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-66.7-51.7-64.8-55.9-41.6-48.9-85.5-77.5-66.5-72.7-98.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax srt:ConsolidationEliminations0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, wrb:InsuranceDomesticSegment


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value23019817113048140162162179145165178156181153123124134144144123139129130120114124154121138125118106999394103
Percentage of NetIncomeLoss97.186.654.985.968.2-3171.5136.098.782.780.8125.1110.386.7109.299.376.0114.2108.694.365.4113.6116.5117.785.598.097.1112.882.167.781.496.686.391.885.256.794.095.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax215.6195.40.0146.256.8172.90.0214.5245.2205.60.0259.0236.9273.70.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:OperatingSegments wrb:InsuranceDomesticSegment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, wrb:ReinsuranceandMonolineExcessSegment


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value59547549102936384135
Percentage of NetIncomeLoss25.023.724.332.415.0-660.630.523.119.319.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax55.553.60.055.112.536.00.050.357.350.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:OperatingSegments wrb:ReinsuranceandMonolineExcessSegment0.00.00.00.00.00.00.00.00.00.0

Net Income Loss Attributable To Noncontrolling Interest

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value440000.02191000.0340000.0688000.0396000.0892000.0487000.0-57000.0718000.0892000.03915000.02523000.0703000.01177000.01683000.0764000.0569000.01227000.0880000.013000.0-61000.0737000.0133000.0129000.014000.0137000.0240000.0252000.0216000.011000.05009000.01214000.0-830000.0-17000.010000.061000.066000.0-86000.028000.0-39000.0-64000.05000.041000.050000.017000.0171000.0
Percentage of NetIncomeLossAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.42.20.00.80.51.10.0-0.11.01.30.03.71.11.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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
Value16815818014285174137161188158159186153174149142135148159145129130127133127124114179138168138125143135151116161157117114149146146119129143
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 RevenueFromContractWithCustomerIncludingAssessedTax157.4156.00.0160.199.8215.60.0212.7257.7222.80.0270.0233.3263.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetInvestmentIncome us-gaap:ConsolidationItems

srt:ConsolidationEliminations


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value4.60515141713181118151714
Percentage of NetInvestmentIncome2.79.910.220.97.811.36.111.88.611.38.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax4.315.416.320.916.824.115.726.223.226.321.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax srt:ConsolidationEliminations0.00.00.00.00.00.00.00.00.00.00.0

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

us-gaap:OperatingSegments, wrb:InsuranceDomesticSegment


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value116105120874412397991321001221461141351151051021111321171001058993938281125103118104941079710982120
Percentage of NetInvestmentIncome69.466.466.461.651.670.670.961.670.363.276.578.674.377.877.574.375.975.283.180.677.680.970.470.173.066.571.570.274.370.075.474.974.871.972.171.274.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax109.2103.50.098.651.5152.30.0131.1181.1140.90.0212.2173.4204.70.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:OperatingSegments wrb:InsuranceDomesticSegment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, wrb:ReinsuranceandMonolineExcessSegment


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value46374440233736434439
Percentage of NetInvestmentIncome27.923.824.628.327.521.626.427.123.625.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax43.937.10.045.227.446.50.057.660.855.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:OperatingSegments wrb:ReinsuranceandMonolineExcessSegment0.00.00.00.00.00.00.00.00.00.0

Operating Costs And Expenses

us-gaap:OperatingCostsAndExpenses

us-gaap:OperatingCostsAndExpenses


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value199618601913183318301817182917621749170717881728168116801733180516871686173916881697163216541632161115751621156215331459151414351412134613761286126711911220118211601073105510541017992
Percentage of OperatingCostsAndExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1868.51830.10.02057.62138.72242.10.02319.42393.82404.50.02507.62551.02532.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value2.5374.05664021-98.19468-36.682-14.49219-36.12915-104.45512-6.868282022-46.804-19.47-55.87-2.047-48.031-62.53533-47.805-33.535-49.3824-4.0251.60344-23.156-46.6230.18126-17.25715
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax2.44.00.045.125.1-121.20.0-48.3-19.827.80.022.8-158.519.30.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedTranslationAdjustment


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value2.5374.05664021-98.19468-36.682-14.49219-36.12915-104.45512-6.868282022-46.804-19.47-55.87-2.047-48.031-62.53533-47.805-33.535-49.3824-4.0251.60344-23.156-46.6230.18126-17.25715
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax2.44.00.045.125.1-121.20.0-48.3-19.827.80.022.8-158.519.30.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Other Comprehensive Income Loss Net Of Tax

us-gaap:OtherComprehensiveIncomeLossNetOfTax

us-gaap:OtherComprehensiveIncomeLossNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value25-86.0810878340-357.17564-61.427104145-35.4-79.156-136.897-112.973-85.21820631365-67.1464974-94.741-58.038-65.993-31.514-90.081-60.2727569-28.0747.263-218.402-36.999-42.515912338
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax24.2-84.70.088.1397.4-440.70.0-80.8142.5204.90.0-114.8-207.7-170.30.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value23-90.134238318-258.981-3.777-24.7451181250.729-94.842-32.442-125.772-78.35-8.16843-8.831112-47.67610576-46.714.497-99.6216-58.566-12.9124872-32.935-38.879-197.067.81
Percentage of OtherComprehensiveIncomeLossNetOfTax90.2104.738.848.893.772.5-5.840.3113.986.4-2.1119.823.7111.391.9-40.068.3-63.5171.571.0213.6102.749.3-7.7151.0-51.765.021.464.2104.9117.3-535.390.2-21.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax21.8-88.60.043.0372.4-319.60.0-32.6162.3177.10.0-137.6-49.2-189.50.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value25-86.0810878340-357.17564-61.427104145-35.4-79.156-136.897-112.973-85.21820631365-67.1464974-94.741-58.038-65.993-31.514-90.081-60.2727569-28.0747.263-218.402-36.999
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax24.2-84.70.088.1397.4-440.70.0-80.8142.5204.90.0-114.8-207.7-170.30.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value2.5374.05664021-98.19468-36.682-14.49219-36.12915-104.45512-6.868282022-46.804-19.47-55.87-2.047-48.031-62.53533-47.805-33.535-49.3824-4.0251.60344-23.156-46.623
Percentage of OtherComprehensiveIncomeLossNetOfTax9.8-4.761.251.26.327.5105.859.7-13.913.6102.1-19.876.3-11.38.1140.031.7163.5-71.529.0-113.6-2.750.7107.7-51.0151.737.281.933.1-5.8-5.7610.310.6126.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax2.44.00.045.125.1-121.20.0-48.3-19.827.80.022.8-158.519.30.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NoncontrollingInterest


Other
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value-0.0010.0-0.003-0.0010.001-0.0020.1230.03-0.0470.04-0.06-0.0370.0110.038-0.0330.033-0.0190.007-0.0570.005-0.0140.068-0.0940.01-0.022-0.0860.0820.0190.0180.0140.009-0.0350.040.0060.0430.0050.023
Percentage of OtherComprehensiveIncomeLossNetOfTax-0.00.0-0.0-0.0-0.0-0.0-0.20.0-0.0-0.10.10.0-0.0-0.0-0.20.1-0.10.00.10.0-0.0-0.10.2-0.00.10.1-0.10.00.0-0.00.10.0-0.1-0.00.00.00.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-0.00.0-0.0-0.00.00.00.20.0-0.10.0-0.1-0.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:NoncontrollingInterest0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Other Income

us-gaap:OtherIncome

us-gaap:OtherIncome


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.8330.2590.150.140.1832.1230.170.1882.8930.120.6220.0090.0380.0110.110.0060.1880.50.3760.00.0540.2580.0020.030.0460.2590.3770.4050.240.2860.2720.2480.2250.2810.361.4280.3840.3920.40.4060.5740.3840.4040.310.3560.452
Percentage of OtherIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.80.30.00.20.22.60.00.24.00.20.00.00.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Policyholder Benefits And Claims Incurred Net

us-gaap:PolicyholderBenefitsAndClaimsIncurredNet

us-gaap:PolicyholderBenefitsAndClaimsIncurredNet


Policyholder
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value120311211111111411351107107210411028988102010179739639761081964979993965964922922926906900913887867822848798805744801736731679693683674607591597570549
Percentage of PolicyholderBenefitsAndClaimsIncurredNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1126.71103.10.01250.91326.21366.20.01370.31407.61392.10.01476.31477.01451.60.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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
Value19711849181317481676169117161676164615921619160315811567159115811568157016201585155915271543153114931472150214601417136313831328128212321239118611471099110510551017982989967948930
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 RevenueFromContractWithCustomerIncludingAssessedTax1845.51819.40.01962.81959.22087.00.02206.32253.12242.90.02326.02398.42362.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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

us-gaap:OperatingSegments, wrb:InsuranceDomesticSegment


Premiums
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value1727160415861531146514841523149314751427148714881456143214431433141514131446143113991375120011811159111711331093104110031013958925884886873846
Percentage of PremiumsEarnedNet87.686.887.587.587.487.888.889.189.689.691.992.892.191.490.790.790.290.089.290.389.790.077.777.277.775.975.474.973.573.673.272.272.271.871.573.673.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1616.71578.50.01718.31711.61832.30.01965.62018.32009.40.02159.42208.72158.60.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:OperatingSegments wrb:InsuranceDomesticSegment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, wrb:ReinsuranceandMonolineExcessSegment


Premiums
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value244244227217211206193182171165
Percentage of PremiumsEarnedNet12.413.212.512.512.612.211.210.910.410.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax228.8240.90.0244.5247.5254.80.0240.7234.9233.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:OperatingSegments wrb:ReinsuranceandMonolineExcessSegment0.00.00.00.00.00.00.00.00.00.0

us-gaap:PremiumsEarnedNet us-gaap:ProductOrService, us-gaap:StatementBusinessSegments

wrb:Casualty, wrb:ReinsuranceandMonolineExcessSegment


Premiums
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value1521491301301221069590
Percentage of PremiumsEarnedNet7.78.17.47.87.36.45.85.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax142.8147.2146.1152.4151.4140.2130.1127.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax wrb:Casualty wrb:ReinsuranceandMonolineExcessSegment0.00.00.00.00.00.00.00.0

wrb:CommercialAutomobile, wrb:InsuranceDomesticSegment


Premiums
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value237220203190189191188180185175175163161158164159156136138138134140134127124124125119116116116112
Percentage of PremiumsEarnedNet12.011.911.611.411.211.411.411.411.511.111.210.310.310.110.410.310.38.89.09.39.29.49.29.09.19.09.59.39.49.49.89.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax222.3217.1227.9222.4234.0251.5257.6254.8268.5266.7264.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax wrb:CommercialAutomobile wrb:InsuranceDomesticSegment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

wrb:MonolineExcess, wrb:ReinsuranceandMonolineExcessSegment


Premiums
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value48454443414241403938
Percentage of PremiumsEarnedNet2.42.52.52.52.42.52.42.42.42.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax45.245.10.048.948.052.00.053.553.954.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax wrb:MonolineExcess wrb:ReinsuranceandMonolineExcessSegment0.00.00.00.00.00.00.00.00.00.0

wrb:OtherInsuranceLiabilities, wrb:InsuranceDomesticSegment


Premiums
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value638601584561544547539527505490490482474464465466460451467465443422399395379372378368362339341314307295292280257
Percentage of PremiumsEarnedNet32.432.532.232.132.532.331.431.430.730.830.330.130.029.629.229.529.328.828.929.328.427.725.925.825.425.325.225.225.524.924.723.724.024.023.623.722.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax597.6592.00.0630.3636.1675.10.0693.7691.8690.90.0699.5720.1699.50.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax wrb:OtherInsuranceLiabilities wrb:InsuranceDomesticSegment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

wrb:ProductsLiability, wrb:InsuranceDomesticSegment


Premiums
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value219190185168155151152143144139141142139131139137136132133128122118979487907876667170666464656362
Percentage of PremiumsEarnedNet11.210.310.29.69.38.98.98.58.88.88.88.98.88.48.78.78.78.58.28.17.97.76.36.25.96.15.25.24.75.35.15.05.05.35.35.45.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax205.9187.00.0189.3181.8186.40.0188.4198.3196.70.0206.8212.0198.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax wrb:ProductsLiability wrb:InsuranceDomesticSegment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

wrb:Property, wrb:ReinsuranceandMonolineExcessSegment


Premiums
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value43494444404139353736
Percentage of PremiumsEarnedNet2.22.72.42.52.42.52.32.12.32.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax40.948.60.049.547.151.30.047.150.850.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax wrb:Property wrb:ReinsuranceandMonolineExcessSegment0.00.00.00.00.00.00.00.00.00.0

wrb:ShortTailLines, wrb:InsuranceDomesticSegment


Premiums
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value339324326295295310305
Percentage of PremiumsEarnedNet17.217.618.617.617.518.518.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax318.1319.4365.9345.8364.6408.4418.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax wrb:ShortTailLines wrb:InsuranceDomesticSegment0.00.00.00.00.00.00.0

wrb:WorkersCompensation, wrb:InsuranceDomesticSegment


Premiums
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value291267395271278301322321330326367378377365374378366361361355346345329322325292302291270263272252241229231223224
Percentage of PremiumsEarnedNet14.814.521.815.516.617.818.819.220.120.522.723.623.923.323.623.923.423.022.322.422.222.621.321.121.819.920.119.919.119.319.719.018.818.618.718.819.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax272.8263.00.0305.0325.6372.10.0423.5452.2460.00.0549.7572.4551.50.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax wrb:WorkersCompensation wrb:InsuranceDomesticSegment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Profit Loss

us-gaap:ProfitLoss

us-gaap:ProfitLoss


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value23723131215271-3.526119165217181136164180167156162109124153220108120109152123118110188180169135138115116165101108135117778311612693110118
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax222.5227.90.0171.083.7-4.40.0217.3297.5255.70.0238.5274.2252.50.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ProfitLoss us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value118.8614.659-1.215-16.79339-9.1962.2780.174-1.3654.320.47-2.999-7.583-32.64-28.136-25.718-28.825-3.605-26.708-8.516-1.3874.2060.554-2.007-8.301-13.472-16.011-14.646-4.499-12.023-28.548-14.126-13.179
Percentage of ProfitLoss4.83.81.5-0.8-23.4-1121.7-7.71.40.1-0.83.20.3-1.7-4.5-20.9-17.3-23.5-23.1-2.3-12.1-7.8-1.23.80.4-1.6-7.0-12.1-8.5-8.1-2.7-8.9-20.7-12.3-11.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax10.78.70.0-1.4-19.648.80.03.00.2-1.90.00.7-4.5-11.40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedOtherComprehensiveIncome


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value118.8614.659-1.215-16.79339-9.1962.2780.174-1.3654.320.47-2.999-7.583-32.64-28.136-25.718-28.825-3.605-26.708-8.516-1.3874.2060.554-2.007-8.301-11.452-13.991-12.626-3.908-8.765-26.734-12.312-11.365
Percentage of ProfitLoss4.83.81.5-0.8-23.4-1121.7-7.71.40.1-0.83.20.3-1.7-4.5-20.9-17.3-23.5-23.1-2.3-12.1-7.8-1.23.80.4-1.6-7.0-10.3-7.4-7.0-2.3-6.5-19.3-10.7-9.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax10.78.70.0-1.4-19.648.80.03.00.2-1.90.00.7-4.5-11.40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ProfitLoss us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302011-03-312010-03-31
Value0.442.1910.340.6880.3960.8920.487-0.0570.7180.8923.9152.5230.7031.1771.6830.7640.5691.2270.880.013-0.0610.7370.1330.1290.0140.1370.240.2520.2160.0115.743-1.2140.864-0.0170.092-0.0610.0050.171
Percentage of ProfitLoss0.20.90.10.50.6-25.30.4-0.00.30.52.91.50.40.71.10.50.51.00.60.0-0.10.60.10.10.00.10.20.10.10.04.2-0.90.8-0.00.1-0.10.00.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.42.20.00.80.51.10.0-0.11.01.30.03.71.11.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:NoncontrollingInterest0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value23722931215171-4.418119165216180132161180166154162109123152220108119109152123118110188179169130136115116165100108135117778311612693110118
Percentage of ProfitLoss99.899.199.999.599.4125.399.6100.099.799.597.198.599.699.398.999.599.599.099.4100.0100.199.499.999.9100.099.999.899.999.9100.096.399.1100.7100.0100.099.999.9100.1100.0100.1100.1100.0100.099.9100.099.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax222.1225.70.0170.283.3-5.50.0217.4296.5254.50.0234.9273.2250.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Realized Investment Gains Losses

us-gaap:RealizedInvestmentGainsLosses

us-gaap:RealizedInvestmentGainsLosses


Realized
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value24343877-177.1741.4657368226948591834052771756.3157.343-8.1815327192072109522443331911622244752212229335.204115.912
Percentage of RealizedInvestmentGainsLosses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax22.534.343.791.0-218.61.9100.796.732.4105.673.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Revenue From Contract With Customer Including Assessed Tax

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1061011028985819476737166686566
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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
Value2296215623122039193618101976196520231937195119371910189119342031184818701971201918551807181118601789174417841840179617061696163415701506160814201415137813701279127012341231117611631153
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 RevenueFromContractWithCustomerIncludingAssessedTax2149.22121.22255.82289.32261.92234.12100.42586.42768.32727.52920.62811.12898.82850.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Revenues us-gaap:ConsolidationItems

srt:ConsolidationEliminations


Revenuesus-gaap:
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value12812011410512613211212212210595
Percentage of Revenues5.65.65.65.57.06.75.66.36.35.55.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax120.4118.9128.3123.4156.4174.3153.8172.7177.7159.4144.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax srt:ConsolidationEliminations0.00.00.00.00.00.00.00.00.00.00.0

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

us-gaap:OperatingSegments, wrb:InsuranceDomesticSegment


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value18521718171616281517161616301605162115401625165415891587164615391541154315991571152715071313129812771225123912451171115011441079106110081021982994
Percentage of Revenues80.779.774.279.878.489.382.581.780.179.583.385.483.283.985.175.883.482.581.177.882.383.472.569.871.470.369.567.765.267.467.566.067.667.063.569.270.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1733.61690.11674.41827.51772.51995.01733.02111.92218.12168.92433.12399.92410.52391.90.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:OperatingSegments wrb:InsuranceDomesticSegment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, wrb:InsuranceInternationalSegment


Revenuesus-gaap:
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value221196183149168185179170176176183166168184187179200211201210217225213201193200193183189168165
Percentage of Revenues9.69.19.07.79.39.48.88.89.19.29.78.29.19.89.39.611.111.311.312.012.212.311.911.811.412.312.312.211.811.811.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax206.9192.8205.4174.1207.3243.4244.9239.4255.3267.0275.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:OperatingSegments wrb:InsuranceInternationalSegment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, wrb:ReinsuranceInternational


Revenuesus-gaap:
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value90887765696562595155564950494850
Percentage of Revenues3.94.13.83.43.83.33.13.02.62.93.02.42.72.62.42.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax84.286.586.475.985.185.584.883.174.083.484.40.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:OperatingSegments wrb:ReinsuranceInternational0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, wrb:ReinsuranceandMonolineExcessSegment


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value291282271258235244229226216205
Percentage of Revenues12.713.111.712.712.213.511.611.510.710.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax272.7278.0264.9289.7274.9301.3243.8298.3295.7289.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:OperatingSegments wrb:ReinsuranceandMonolineExcessSegment0.00.00.00.00.00.00.00.00.00.0

Assets

us-gaap:Assets

us-gaap:Assets


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value3029729791286062821227323260892664326218264872558524895248552462124587242992433623993235472336423345230252223021730217382168921847217162209721167207042055120523202112012020155199321946219133184871833018195179831752817328
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Assets us-gaap:ConsolidatedEntities

srt:ParentCompany


Assetsus-gaap:
Period End2020-12-312019-12-312018-12-31
Value915688418335
Percentage of Assets32.033.233.5
Percentage of Assets32.033.233.5
Percentage of Assets srt:ParentCompany100.0100.0100.0

us-gaap:Assets us-gaap:ConsolidationItems

srt:ConsolidationEliminations


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value28553127221524542341219819131824246924812310
Percentage of Assets9.410.57.78.78.68.47.27.09.39.79.3
Percentage of Assets9.410.57.78.78.68.47.27.09.39.79.3
Percentage of Assets srt:ConsolidationEliminations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

wrb:CorporateReconcilingItemsAndEliminations


Assetsus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value22151930231018661702
Percentage of Assets7.77.29.37.77.3
Percentage of Assets7.77.29.37.77.3
Percentage of Assets wrb:CorporateReconcilingItemsAndEliminations100.0100.0100.0100.0100.0

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

us-gaap:OperatingSegments, wrb:InsuranceDomesticSegment


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value22771219852173921060204221948520003197781944418591196341951119219193221926319136186871893219137189721847518232163511629816105160111606516074155651517715247150971484914661
Percentage of Assets75.273.876.074.674.774.775.175.473.472.778.978.578.178.679.378.677.980.481.981.380.282.075.275.074.373.374.072.773.573.374.273.673.572.7
Percentage of Assets75.273.876.074.674.774.775.175.473.472.778.978.578.178.679.378.677.980.481.981.380.282.075.275.074.373.374.072.773.573.374.273.673.572.7
Percentage of Assets us-gaap:OperatingSegments wrb:InsuranceDomesticSegment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, wrb:ReinsuranceandMonolineExcessSegment


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-31
Value46704678465246974559440547094371
Percentage of Assets15.415.716.316.616.716.917.717.6
Percentage of Assets15.415.716.316.616.716.917.717.6
Percentage of Assets us-gaap:OperatingSegments wrb:ReinsuranceandMonolineExcessSegment100.0100.0100.0100.0100.0100.0100.0100.0

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
Value2370923360222812217221477205522052520119204671978219416193761915519095188481886518667183281828318383180861744217097171211715317234170921735416512162931618216128159451571015820155991524514998144711446114275141841381813726
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 Assets78.378.477.978.678.678.877.076.777.377.378.078.077.877.777.677.577.877.878.378.778.578.578.778.879.178.978.778.578.078.778.778.678.978.178.578.378.378.478.378.978.578.978.879.2

us-gaap:Liabilities us-gaap:ConsolidatedEntities

srt:ParentCompany


Liabilitiesus-gaap:
Period End2020-12-312019-12-312018-12-31
Value284527662897
Percentage of Liabilities12.813.514.9
Percentage of Assets9.910.411.6
Percentage of Assets srt:ParentCompany31.131.334.8

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
Value3029729791286062821227323260892664326218264872558524895248552462124587242992433623993235472336423345230252223021730217382168921847217162209721167207042055120523202112012020155199321946219133184871833018195179831752817328
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilitiesAndStockholdersEquity us-gaap:ConsolidatedEntities

srt:ParentCompany


Liabilities
Period End2020-12-312019-12-312018-12-31
Value915688418335
Percentage of LiabilitiesAndStockholdersEquity32.033.233.5
Percentage of Assets32.033.233.5
Percentage of Assets srt:ParentCompany100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value65786414631059955801549360746056597657595437543754265451541154305286517950474925490247514600458345024578458947084619437543364367423843784306432442074126400838623912379137023596
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets21.721.522.121.221.221.122.823.122.622.521.821.922.022.222.322.322.022.021.621.121.321.421.221.120.821.021.121.321.821.121.121.321.021.821.421.721.621.621.721.121.521.121.120.8

us-gaap:StockholdersEquity us-gaap:ConsolidatedEntities

srt:ParentCompany


Stockholders
Period End2020-12-312019-12-312018-12-31
Value631060745437
Percentage of StockholdersEquity100.0100.0100.0
Percentage of Assets22.122.821.8
Percentage of Assets srt:ParentCompany68.968.765.2

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashAndCashEquivalentsAtCarryingValue


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value179020142372257124309651023812125893781781991195695077378860879587394883776387975661467413428426438399666589459051189101210829118667946306429227814415151134951
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.96.88.39.18.93.73.83.14.73.73.33.33.73.93.93.23.32.63.43.74.13.83.54.03.52.83.16.14.03.14.14.73.34.74.56.05.25.74.94.74.43.53.70.00.00.03.00.00.0

us-gaap:CashAndCashEquivalentsAtCarryingValue us-gaap:ConsolidatedEntities

srt:ParentCompany


Cash
Period End2020-12-312019-12-312018-12-312017-12-312011-12-30
Value2963898345124
Percentage of CashAndCashEquivalentsAtCarryingValue12.538.110.34.70.0
Percentage of Assets1.01.50.30.20.0
Percentage of Assets srt:ParentCompany3.24.41.00.00.0

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value1790201423722571243096510238121258937817819911956950
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.96.88.39.18.93.73.83.14.73.73.33.33.73.93.9

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents us-gaap:ConsolidatedEntities

srt:ParentCompany


Cash
Period End2020-12-312019-12-312018-12-312017-12-31
Value2963898345
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents12.538.110.34.7
Percentage of Assets1.01.50.30.2
Percentage of Assets srt:ParentCompany3.24.41.00.0

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:PropertyPlantAndEquipmentNet


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value428404405410414422422416398406416424427424422399424356349348346346348336332327332333335337339336291271267258264268262263254256254246
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.41.41.41.51.51.61.61.61.51.61.71.71.71.71.71.61.81.51.51.51.51.61.61.51.51.51.51.51.61.61.71.61.41.31.31.31.41.41.41.41.41.41.51.4

us-gaap:PropertyPlantAndEquipmentNet us-gaap:ConsolidatedEntities

srt:ParentCompany


Property
Period End2020-12-312019-12-312018-12-31
Value111213
Percentage of PropertyPlantAndEquipmentNet2.82.93.2
Percentage of Assets0.00.00.1
Percentage of Assets srt:ParentCompany0.10.10.2

Investments In Affiliates Subsidiaries Associates And Joint Ventures

us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures us-gaap:ConsolidatedEntities

us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures

srt:ParentCompany


Investments
Period End2020-12-312019-12-312018-12-31
Value795776236786
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures100.0100.0100.0
Percentage of Assets27.828.627.3
Percentage of Assets srt:ParentCompany86.986.281.4

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
Value16916916916916916916916917317317317117817817817314414414413415415315315315015015010310311011011311210787878790909090909090
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 Assets0.60.60.60.60.60.70.60.60.70.70.70.70.70.70.70.70.60.60.60.60.70.70.70.70.70.70.70.50.50.50.50.60.60.50.40.40.50.50.50.50.50.50.50.5

Intangible Assets Net Excluding Goodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill us-gaap:BalanceSheetLocation

us-gaap:IntangibleAssetsNetExcludingGoodwill

us-gaap:OtherAssets


Intangible
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value93991041078294967231
Percentage of IntangibleAssetsNetExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.30.40.40.40.40.40.40.40.2
Percentage of Assets us-gaap:OtherAssets0.00.00.00.00.00.00.00.00.0

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
Value148156164172180184193194179185
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.50.50.60.60.70.70.70.70.70.7

Equity Securities Fv Ni

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

us-gaap:EquitySecuritiesFvNi

us-gaap:CommonStock, us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring


Equity
Period End2020-12-312019-12-312018-12-31
Value34015789
Percentage of EquitySecuritiesFvNi100.0100.0100.0
Percentage of Assets1.20.60.4
Percentage of Assets us-gaap:CommonStock us-gaap:FairValueInputsLevel1 us-gaap:FairValueMeasurementsRecurring0.00.00.0

us-gaap:CommonStock, us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring


Equity
Period End2020-12-312019-12-312018-12-31
Value9.2159.0538.596
Percentage of EquitySecuritiesFvNi2.75.79.6
Percentage of Assets0.00.00.0
Percentage of Assets us-gaap:CommonStock us-gaap:FairValueInputsLevel3 us-gaap:FairValueMeasurementsRecurring0.00.00.0

us-gaap:PreferredStock, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Equity
Period End2020-12-312019-12-312018-12-31
Value266307176
Percentage of EquitySecuritiesFvNi78.1194.8197.4
Percentage of Assets0.91.20.7
Percentage of Assets us-gaap:PreferredStock us-gaap:FairValueInputsLevel2 us-gaap:FairValueMeasurementsRecurring0.00.00.0

us-gaap:PreferredStock, us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring


Equity
Period End2020-12-312019-12-312018-12-31
Value9.3316.5053.945
Percentage of EquitySecuritiesFvNi2.74.14.4
Percentage of Assets0.00.00.0
Percentage of Assets us-gaap:PreferredStock us-gaap:FairValueInputsLevel3 us-gaap:FairValueMeasurementsRecurring0.00.00.0

us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency

us-gaap:CommonStock, us-gaap:FairValueMeasurementsRecurring


Equity
Period End2020-12-312019-12-312018-12-31
Value35016698
Percentage of EquitySecuritiesFvNi102.7105.7109.6
Percentage of Assets1.20.60.4
Percentage of Assets us-gaap:CommonStock us-gaap:FairValueMeasurementsRecurring0.00.00.0

us-gaap:PreferredStock, us-gaap:FairValueMeasurementsRecurring


Equity
Period End2020-12-312019-12-312018-12-31
Value275313180
Percentage of EquitySecuritiesFvNi80.8198.9201.8
Percentage of Assets1.01.20.7
Percentage of Assets us-gaap:PreferredStock us-gaap:FairValueMeasurementsRecurring0.00.00.0

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

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring


Equity
Period End2020-12-312019-12-312018-12-31
Value34015789
Percentage of EquitySecuritiesFvNi100.0100.0100.0
Percentage of Assets1.20.60.4
Percentage of Assets us-gaap:FairValueInputsLevel1 us-gaap:FairValueMeasurementsRecurring0.00.00.0

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Equity
Period End2020-12-312019-12-312018-12-31
Value266307176
Percentage of EquitySecuritiesFvNi78.1194.8197.4
Percentage of Assets0.91.20.7
Percentage of Assets us-gaap:FairValueInputsLevel2 us-gaap:FairValueMeasurementsRecurring0.00.00.0

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring


Equity
Period End2020-12-312019-12-312018-12-31
Value181512
Percentage of EquitySecuritiesFvNi5.49.914.0
Percentage of Assets0.10.10.1
Percentage of Assets us-gaap:FairValueInputsLevel3 us-gaap:FairValueMeasurementsRecurring0.00.00.0

us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure


Equity
Period End2020-12-312019-12-312018-12-31
Value625480279
Percentage of EquitySecuritiesFvNi183.5304.7311.4
Percentage of Assets2.21.81.1
Percentage of Assets us-gaap:CarryingReportedAmountFairValueDisclosure0.00.00.0

us-gaap:EstimateOfFairValueFairValueDisclosure


Equity
Period End2020-12-312019-12-312018-12-31
Value625480279
Percentage of EquitySecuritiesFvNi183.5304.7311.4
Percentage of Assets2.21.81.1
Percentage of Assets us-gaap:EstimateOfFairValueFairValueDisclosure0.00.00.0

us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByMeasurementBasis, us-gaap:FinancialInstrument

us-gaap:CarryingReportedAmountFairValueDisclosure, us-gaap:CommonStock


Equity
Period End2020-12-312019-12-312018-12-31
Value35016698
Percentage of EquitySecuritiesFvNi102.7105.7109.6
Percentage of Assets1.20.60.4
Percentage of Assets us-gaap:CarryingReportedAmountFairValueDisclosure us-gaap:CommonStock0.00.00.0

us-gaap:CarryingReportedAmountFairValueDisclosure, us-gaap:PreferredStock


Equity
Period End2020-12-312019-12-312018-12-31
Value275313180
Percentage of EquitySecuritiesFvNi80.8198.9201.8
Percentage of Assets1.01.20.7
Percentage of Assets us-gaap:CarryingReportedAmountFairValueDisclosure us-gaap:PreferredStock0.00.00.0

us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:CommonStock


Equity
Period End2020-12-312019-12-312018-12-31
Value35016698
Percentage of EquitySecuritiesFvNi102.7105.7109.6
Percentage of Assets1.20.60.4
Percentage of Assets us-gaap:EstimateOfFairValueFairValueDisclosure us-gaap:CommonStock0.00.00.0

us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:PreferredStock


Equity
Period End2020-12-312019-12-312018-12-31
Value275313180
Percentage of EquitySecuritiesFvNi80.8198.9201.8
Percentage of Assets1.01.20.7
Percentage of Assets us-gaap:EstimateOfFairValueFairValueDisclosure us-gaap:PreferredStock0.00.00.0

us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring


Equity
Period End2020-12-312019-12-312018-12-31
Value625480279
Percentage of EquitySecuritiesFvNi183.5304.7311.4
Percentage of Assets2.21.81.1
Percentage of Assets us-gaap:FairValueMeasurementsRecurring0.00.00.0

Other Assets

us-gaap:OtherAssets

us-gaap:OtherAssets


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value675715700698769764762708734695501478477483434423433501402408530517442434430414369529327295335343376320242154153195192190192216198171
Percentage of OtherAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.22.42.42.52.82.92.92.72.82.72.01.91.92.01.81.71.82.11.71.82.32.32.02.02.01.91.72.41.51.41.61.71.91.61.20.80.81.01.01.01.11.21.11.0

us-gaap:OtherAssets us-gaap:ConsolidatedEntities

srt:ParentCompany


Other
Period End2020-12-312019-12-312018-12-31
Value111312
Percentage of OtherAssets1.61.72.5
Percentage of Assets0.00.00.0
Percentage of Assets srt:ParentCompany0.10.20.1

Taxes Payable Current

us-gaap:TaxesPayableCurrent

us-gaap:TaxesPayableCurrent


Taxes
Period End2020-12-312019-12-312012-06-302012-03-312011-12-31
Value411015530.0
Percentage of TaxesPayableCurrent100.0100.0100.0100.00.0
Percentage of Assets0.10.00.10.30.0

us-gaap:TaxesPayableCurrent us-gaap:ConsolidatedEntities

srt:ParentCompany


Taxes
Period End2020-12-31
Value15
Percentage of TaxesPayableCurrent37.9
Percentage of Assets0.1
Percentage of Assets srt:ParentCompany0.2

Long Term Debt

us-gaap:LongTermDebt us-gaap:DebtInstrument

us-gaap:LongTermDebt

wrb:SubsidiaryDebt


Long
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value110108123125.554811547757
Percentage of LongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.40.40.50.10.00.40.70.40.3
Percentage of Assets wrb:SubsidiaryDebt0.00.00.00.00.00.00.00.00.0

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

wrb:SeniorNotesDueFebruary152037, us-gaap:SeniorNotes


Long
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value248248248247247247247247247
Percentage of LongTermDebt223.7228.0200.01980.64461.4303.0160.5320.7428.0
Percentage of Assets0.90.91.01.01.11.11.11.21.2
Percentage of Assets wrb:SeniorNotesDueFebruary152037 us-gaap:SeniorNotes0.00.00.00.00.00.00.00.00.0

wrb:SeniorNotesDueJanuary12022, us-gaap:SeniorNotes


Long
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value767676767676767675
Percentage of LongTermDebt68.970.261.5608.91371.193.149.398.5131.4
Percentage of Assets0.30.30.30.30.30.40.40.40.4
Percentage of Assets wrb:SeniorNotesDueJanuary12022 us-gaap:SeniorNotes0.00.00.00.00.00.00.00.00.0

wrb:SeniorNotesDueMaarch152022, us-gaap:SeniorNotes


Long
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value349349348348347347346346346
Percentage of LongTermDebt314.9320.8281.22782.56262.8425.0225.0449.1598.9
Percentage of Assets1.21.31.41.41.51.61.61.71.7
Percentage of Assets wrb:SeniorNotesDueMaarch152022 us-gaap:SeniorNotes0.00.00.00.00.00.00.00.00.0

wrb:SeniorNotesDueMay122050, us-gaap:SeniorNotes


Long
Period End2020-12-31
Value492
Percentage of LongTermDebt443.5
Percentage of Assets1.7
Percentage of Assets wrb:SeniorNotesDueMay122050 us-gaap:SeniorNotes0.0

wrb:SeniorNotesdueAugust12044, us-gaap:SeniorNotes


Long
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value3453453453453443443440.0
Percentage of LongTermDebt311.4317.5278.52757.36210.2421.7223.40.0
Percentage of Assets1.21.31.41.41.51.61.60.0
Percentage of Assets wrb:SeniorNotesdueAugust12044 us-gaap:SeniorNotes0.00.00.00.00.00.00.00.0

wrb:SubordinatedDebenturedueJune12056, us-gaap:SubordinatedDebt


Long
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value282281281281281
Percentage of LongTermDebt254.1259.0227.12247.75061.2
Percentage of Assets1.01.11.11.21.2
Percentage of Assets wrb:SubordinatedDebenturedueJune12056 us-gaap:SubordinatedDebt0.00.00.00.00.0

wrb:SubordinatedDebenturedueMarch12056, us-gaap:SubordinatedDebt


Long
Period End2020-12-312019-12-312018-12-312017-12-31
Value106106106106
Percentage of LongTermDebt95.897.785.6847.4
Percentage of Assets0.40.40.40.4
Percentage of Assets wrb:SubordinatedDebenturedueMarch12056 us-gaap:SubordinatedDebt0.00.00.00.0

wrb:SubordinatedDebtDueDecember302059, us-gaap:SubordinatedDebt


Long
Period End2020-12-312019-12-312018-12-31
Value2902900.0
Percentage of LongTermDebt261.9267.00.0
Percentage of Assets1.01.10.0
Percentage of Assets wrb:SubordinatedDebtDueDecember302059 us-gaap:SubordinatedDebt0.00.00.0

wrb:SubordinatedDebtDueMarch302058, us-gaap:SubordinatedDebt


Long
Period End2020-12-312019-12-312018-12-312017-12-31
Value1791781780.0
Percentage of LongTermDebt161.3164.4144.10.0
Percentage of Assets0.60.70.70.0
Percentage of Assets wrb:SubordinatedDebtDueMarch302058 us-gaap:SubordinatedDebt0.00.00.00.0

wrb:SubordinatedDebtDueSeptember302060, us-gaap:SubordinatedDebt


Long
Period End2020-12-31
Value244
Percentage of LongTermDebt220.1
Percentage of Assets0.9
Percentage of Assets wrb:SubordinatedDebtDueSeptember302060 us-gaap:SubordinatedDebt0.0

us-gaap:LongTermDebt us-gaap:LongtermDebtType

us-gaap:SubordinatedDebt


Long
Period End2020-12-312019-12-312018-12-312017-12-31
Value11021198907728
Percentage of LongTermDebt993.21101.7731.95818.3
Percentage of Assets3.94.53.63.0
Percentage of Assets us-gaap:SubordinatedDebt0.00.00.00.0

wrb:SeniorNotesandOtherDebt


Long
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value162314271882176917601844211516921871
Percentage of LongTermDebt1462.41312.01517.914134.331699.62256.41371.72193.03238.2
Percentage of Assets5.75.47.67.37.58.59.78.29.3
Percentage of Assets wrb:SeniorNotesandOtherDebt0.00.00.00.00.00.00.00.00.0

Deferred Income Tax Liabilities Net

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:DeferredIncomeTaxLiabilitiesNet


Deferred
Period End2021-03-312020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value7642100.0171538430.00.00.098
Percentage of DeferredIncomeTaxLiabilitiesNet100.0100.0100.00.0100.0100.0100.0100.00.00.00.0100.0
Percentage of Assets0.30.10.00.00.10.10.10.20.00.00.00.4

us-gaap:DeferredIncomeTaxLiabilitiesNet us-gaap:ConsolidatedEntities

srt:ParentCompany


Deferred
Period End2020-12-312019-12-312018-12-31
Value31220.0
Percentage of DeferredIncomeTaxLiabilitiesNet75.5129.00.0
Percentage of Assets0.10.10.0
Percentage of Assets srt:ParentCompany0.30.30.0

Minority Interest

us-gaap:MinorityInterest

us-gaap:MinorityInterest


Minority
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value9.678151444444443434342414139403940393833363636323334343434343433282732299.4469.0588.5397.5267.4157.2657.1936.985.879
Percentage of MinorityInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.10.10.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.10.20.20.20.20.20.20.20.20.20.20.20.20.10.10.20.10.00.00.00.00.00.00.00.00.0

Lessee Operating Lease Liability Payments Due Year Two

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value39414146
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo100.0100.0100.0100.0
Percentage of Assets0.10.10.10.2

Lessee Operating Lease Liability Payments Due Year Three

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value32383741
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree100.0100.0100.0100.0
Percentage of Assets0.10.10.10.1

Lessee Operating Lease Liability Payments Due Year Four

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value23313137
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour100.0100.0100.0100.0
Percentage of Assets0.10.10.10.1

Lessee Operating Lease Liability Payments Due Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive


Lessee
Period End2021-03-312020-12-312020-09-30
Value222231
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive100.0100.0100.0
Percentage of Assets0.10.10.1

Lessee Operating Lease Liability Payments Due After Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive


Lessee
Period End2021-03-312020-12-312020-09-30
Value565878
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive100.0100.0100.0
Percentage of Assets0.20.20.3

Operating Lease Liability

us-gaap:OperatingLeaseLiability

us-gaap:OperatingLeaseLiability


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value185195203211219224230226209215
Percentage of OperatingLeaseLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.60.70.70.80.80.90.90.90.80.8

Lessee Operating Lease Liability Payments Due

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value220226238248
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue100.0100.0100.0100.0
Percentage of Assets0.70.80.80.9

Lessee Operating Lease Liability Undiscounted Excess Amount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value34303436
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount100.0100.0100.0100.0
Percentage of Assets0.10.10.10.1

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value65786414631059955801549360746056597657595437543754265451541154305286517950474925490247514600458345024578458947084619437543364367423843784306432442074126400838623912379137023596
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets21.721.522.121.221.221.122.823.122.622.521.821.922.022.222.322.322.022.021.621.121.321.421.221.120.821.021.121.321.821.121.121.321.021.821.421.721.621.621.721.121.521.121.120.8

us-gaap:StockholdersEquity us-gaap:ConsolidatedEntities

srt:ParentCompany


Stockholders
Period End2020-12-312019-12-312018-12-31
Value631060745437
Percentage of StockholdersEquity100.0100.0100.0
Percentage of Assets22.122.821.8
Percentage of Assets srt:ParentCompany68.968.765.2

Stockholders Equity Including Portion Attributable To Noncontrolling Interest

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value65876430632560395845553761186099602058025479547954655492545154705325521850814961493947884633461645364613462447434654441043694395426544104335433342164135401538693920379837093601
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets21.721.622.121.421.421.223.023.322.722.722.022.022.222.322.422.522.222.221.721.321.521.521.321.220.921.121.321.522.021.321.321.421.121.921.521.721.721.621.721.121.521.121.220.8

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents

us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-312008-12-31
Value222199289247209-109.51412412815234-91.491-92.0882.69435375453461418427314362257180227222322306364377329256289328525517556491452430412387309334450328219-142.216
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest3.43.14.64.13.6-2.02.02.12.50.6-1.7-1.70.00.66.98.38.78.08.46.37.35.43.94.94.97.06.67.78.17.55.96.67.711.911.912.811.710.910.710.79.98.29.00.00.06.10.0
Percentage of Assets0.70.71.00.90.8-0.40.50.50.60.1-0.4-0.40.00.11.51.91.91.81.81.31.61.20.81.01.01.51.41.71.81.61.21.41.62.62.62.82.52.42.32.32.11.71.90.00.01.30.0
Percentage of Assets us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-312011-03-312010-12-312010-03-312009-12-312008-12-312007-12-31
Value222199289247209-109.51412412815234-91.491-92.0882.69435375453461427309334259219-142.21652
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest3.43.14.64.13.6-2.02.02.12.50.6-1.7-1.70.00.66.98.38.78.48.29.00.06.10.00.0
Percentage of Assets0.70.71.00.90.8-0.40.50.50.60.1-0.4-0.40.00.11.51.91.91.81.71.90.01.30.00.0
Percentage of Assets us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-03-312009-12-312008-12-31
Value-122.444-148.252-62.172-170.886-249.35-589.521-257.299-322.1-260.796-364.983-510.47-474.938-395.842-258.982681531336955-9.808578.124-66.6982886152183273333258189217210428465508416393354335340263276396191163-228.959
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-1.9-2.3-1.0-2.8-4.3-10.6-4.2-5.3-4.3-6.3-9.3-8.7-7.2-4.71.32.82.51.31.1-0.21.20.2-1.40.61.93.34.05.87.25.94.34.94.99.710.711.79.99.58.88.78.76.97.50.00.04.50.0
Percentage of Assets-0.4-0.5-0.2-0.6-0.9-2.3-1.0-1.2-1.0-1.4-2.1-1.9-1.6-1.10.30.60.60.30.2-0.00.20.0-0.30.10.40.70.81.21.61.30.91.11.02.12.32.52.12.11.91.81.91.51.60.00.00.90.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value-345.299-347.836-351.886-418.366-458.56-480.007-381.813-450.393-413.711-399.219-418.979-382.85-398.536-294.081-306.88-300.012-328.604-348.851-371.586-324.782-305.31-249.44-247.393-199.362-136.827-170.454-122.649-89.114-39.734-64.549-60.524-62.127-106.455-83.299-36.676-36.857-62.913-45.656-61.239-63.592-32.635-31.628-42.488-39.606-57.591-52.65-40.371-72.47518
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-5.2-5.4-5.6-6.9-7.8-8.7-6.2-7.4-6.9-6.9-7.6-7.0-7.3-5.4-5.6-5.5-6.2-6.7-7.3-6.5-6.2-5.2-5.3-4.3-3.0-3.7-2.7-1.9-0.9-1.5-1.4-1.4-2.5-1.9-0.8-0.9-1.5-1.1-1.5-1.6-0.8-0.8-1.10.00.00.0-1.10.00.0
Percentage of Assets-1.1-1.2-1.2-1.5-1.7-1.8-1.4-1.7-1.6-1.6-1.7-1.5-1.6-1.2-1.3-1.2-1.4-1.5-1.6-1.4-1.3-1.1-1.1-0.9-0.6-0.8-0.6-0.4-0.2-0.3-0.3-0.3-0.5-0.4-0.2-0.2-0.3-0.2-0.3-0.3-0.2-0.2-0.20.00.00.0-0.20.00.0
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value103510231012106410761063105610451058105310631058106010571048104010571047103710271021101310059891003998991982974970967961956949945936944938941927923925935933926924926920907
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest15.715.916.017.618.419.217.317.117.618.219.419.319.419.219.219.019.920.120.420.720.721.221.721.422.121.621.420.720.922.022.121.922.421.521.821.622.422.723.424.023.624.425.20.00.00.025.70.00.0
Percentage of Assets3.43.43.53.83.94.14.04.04.04.14.34.34.34.34.34.34.44.44.44.44.44.64.64.64.64.64.64.44.64.74.74.74.74.74.74.74.94.95.15.15.15.15.30.00.00.05.30.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-03-312020-12-312020-06-302020-03-312019-12-312019-06-302019-03-312018-12-312018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-312008-12-312007-12-31
Value707070707070707070704747474747474747474747474747474747474747
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest1.11.11.21.31.21.21.21.31.31.30.90.91.01.01.11.11.11.11.11.11.21.21.21.21.30.00.01.30.00.0
Percentage of Assets0.20.20.30.30.30.30.30.30.30.30.20.20.20.20.20.20.20.20.20.20.30.30.30.30.30.00.00.30.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NoncontrollingInterest


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value9.678151444444443434342414139403940393833363636323334343434343433282732299.4469.0588.5397.5267.4157.2657.1936.986.7096.4485.8325.8795.36135
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest0.10.20.20.70.80.80.70.70.70.70.80.80.70.70.70.70.70.70.70.70.70.80.70.70.80.70.70.70.70.80.80.60.60.70.70.20.20.20.20.20.20.20.20.00.00.00.20.00.0
Percentage of Assets0.00.10.10.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.10.20.20.20.20.20.20.20.20.20.20.20.20.10.10.20.10.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:NoncontrollingInterest0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value8682855683488057792778777932797178267721755875057423732269566880673567036595651963756282617860835945583657325762558754215265514850244922481748004711461545464439437243014194407739943894378535143271
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest131.8133.1132.0133.4135.6142.3129.6130.7130.0133.1137.9137.0135.8133.3127.6125.8126.5128.5129.8131.4129.1131.2133.3131.8131.1126.5124.0121.5120.1122.9120.5117.1117.8111.6111.1110.8111.7111.6113.2114.7111.6113.2113.10.00.00.0105.10.00.0
Percentage of Assets28.728.729.228.629.030.229.830.429.530.230.430.230.129.828.628.328.128.528.227.927.728.328.428.027.426.726.426.126.426.225.625.124.924.523.924.124.224.124.624.224.023.923.90.00.00.021.80.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value-3087.069-3087.86-3058.425-3026.812-3023.392-2927.994-2726.711-2708.606-2717.41-2720.011-2720.466-2698.018-2708.534-2715.697-2709.386-2690.884-2686.813-2688.173-2688.817-2658.452-2599.312-2600.377-2563.605-2564.536-2579.764-2455.433-2364.551-2356.176-2323.828-2322.181-2132.835-2006.75-1999.294-1969.179-1969.411-1968.227-1911.694-1867.223-1880.79-1887.007-1771.933-1745.264-1750.494-1627.413-1541.82-1411.643-1325.71-1206.518-686.228
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-46.9-48.0-48.3-50.1-51.7-52.9-44.6-44.4-45.1-46.9-49.6-49.2-49.6-49.4-49.7-49.2-50.4-51.5-52.9-53.6-52.6-54.3-55.3-55.5-56.9-53.2-51.1-49.7-49.9-52.6-48.8-45.7-46.9-44.6-45.4-45.4-45.3-45.2-46.8-48.8-45.2-45.9-47.20.00.00.0-36.80.00.0
Percentage of Assets-10.2-10.4-10.7-10.7-11.1-11.2-10.2-10.3-10.3-10.6-10.9-10.9-11.0-11.0-11.1-11.1-11.2-11.4-11.5-11.4-11.3-11.7-11.8-11.8-11.9-11.2-10.9-10.7-11.0-11.2-10.4-9.8-9.9-9.8-9.8-9.9-9.8-9.8-10.2-10.3-9.7-9.7-10.00.00.00.0-7.70.00.0
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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
Value7070707070707070707047474747474747474747474747474747474747474747474747474747474747474747
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 Assets0.20.20.20.30.30.30.30.30.30.30.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.30.30.30.30.30.3

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
Value103510231012106410761063105610451058105310631058106010571048104010571047103710271021101310059891003998991982974970967961956949945936944938941927923925935926
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 Assets3.43.43.53.83.94.14.04.04.04.14.34.34.34.34.34.34.44.44.44.44.44.64.64.64.64.64.64.44.64.74.74.74.74.74.74.74.94.95.15.15.15.15.35.3

us-gaap:AdditionalPaidInCapitalCommonStock us-gaap:ConsolidatedEntities

srt:ParentCompany


Additional
Period End2020-12-312019-12-312018-12-31
Value101210561039
Percentage of AdditionalPaidInCapitalCommonStock100.0100.097.8
Percentage of Assets3.54.04.2
Percentage of Assets srt:ParentCompany11.111.912.5

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
Value86828556834880577927787779327971782677217558750574237322695668806735670365956519637562826178608359455836573257625587542152655148502449224817480047114615454644394372430141943785
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 Assets28.728.729.228.629.030.229.830.429.530.230.430.230.129.828.628.328.128.528.227.927.728.328.428.027.426.726.426.126.426.225.625.124.924.523.924.124.224.124.624.224.023.923.921.8

us-gaap:RetainedEarningsAccumulatedDeficit us-gaap:ConsolidatedEntities

srt:ParentCompany


Retained
Period End2020-12-312019-12-312018-12-31
Value834879327558
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0
Percentage of Assets29.229.830.4
Percentage of Assets srt:ParentCompany91.289.790.7

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value-122.444-148.252-62.172-170.886-249.35-589.521-257.299-322.1-260.796-364.983-510.47-474.938-395.842-258.982681531336955-9.808578.124-66.6982886152183273333258189217210428465508416393354335340263276163
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 Assets-0.4-0.5-0.2-0.6-0.9-2.3-1.0-1.2-1.0-1.4-2.1-1.9-1.6-1.10.30.60.60.30.2-0.00.20.0-0.30.10.40.70.81.21.61.30.91.11.02.12.32.52.12.11.91.81.91.51.60.9

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax us-gaap:ConsolidatedEntities

srt:ParentCompany


Accumulated
Period End2020-12-312019-12-312018-12-31
Value-62.172-257.299-510.47
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0
Percentage of Assets-0.2-1.0-2.1
Percentage of Assets srt:ParentCompany-0.7-2.9-6.1

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
Value30873087305830263023292727262708271727202720269827082715270926902686268826882658259926002563256425792455236423562323232221322006199919691969196819111867188018871771174517501325
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 Assets10.210.410.710.711.111.210.210.310.310.610.910.911.011.011.111.111.211.411.511.411.311.711.811.811.911.210.910.711.011.210.49.89.99.89.89.99.89.810.210.39.79.710.07.7

us-gaap:TreasuryStockValue us-gaap:ConsolidatedEntities

srt:ParentCompany


Treasury
Period End2020-12-312019-12-312018-12-31
Value305827262720
Percentage of TreasuryStockValue100.0100.0100.0
Percentage of Assets10.710.210.9
Percentage of Assets srt:ParentCompany33.430.832.6

Minority Interest

us-gaap:MinorityInterest

us-gaap:MinorityInterest


Minority
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value9.678151444444443434342414139403940393833363636323334343434343433282732299.4469.0588.5397.5267.4157.2657.1936.985.879
Percentage of MinorityInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.10.10.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.10.20.20.20.20.20.20.20.20.20.20.20.20.10.10.20.10.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value38431047955742715234839232478277223139-20.035189297149751213941911402602872716116032011114319331219811522214023873185268160556020412957
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax360.2305.9468.0625.2499.2188.3370.7516.3443.7110.3415.6323.7211.5-30.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-206.411-1195.231-245.764-520.84885530-232.921-254.5672041-187.781-310.039-84.94-131.484100-209.76345-269.7557.383-372.5-323.821-105.55-341.837-106.3682715.476-589.45-177.47392-133.995-169.359-4.342-515.095143-361.785101-236.385-278.594-120.801-49.10140-75.028-184.134-133.988365-10.124
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-193.2-1175.5-239.7-584.5999.538.0-247.6-335.028.558.8-281.0-449.7-128.8-198.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-404.247528-449.64398174-221.95686-575.344-22.874-0.976-99.117-22.666-43.03157-107.714-108.879-15.737-2.756-191.313-97.08825427-7.769-28.84-409.32-109.389-222.781370-13.782-203.891-144.72-34.88747-198.642-145.823-85.917-37.573366-16.175-135.082-56.91312-154.14560-149.122-116.749
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-378.4519.5-438.6111.1204.2-273.991.4-757.0-31.3-1.4-148.3-32.9-65.3237.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-224.712-357.455-199.0811401465-58.698211-445.624320119-1.764-91.836-45.4016.132
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-210.3-351.5-194.2157.81712.5-72.4224.4-586.3438.8168.7-2.6-133.2-68.99.2

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value38431047955742715234839232478277223139-20.035189297149751213941911402602872716116032011114319331219811522214023873185268160556020412957
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax360.2305.9468.0625.2499.2188.3370.7516.3443.7110.3415.6323.7211.5-30.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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
Value23722931215171-4.418119165216180132161180166154162109123152220108119109152123118110188179169130136115116165100108135117778311612693110118
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 RevenueFromContractWithCustomerIncludingAssessedTax222.1225.7304.5170.283.3-5.5126.8217.4296.5254.5198.1234.9273.2250.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:ConsolidationItems

srt:ConsolidationEliminations


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-71.209-52.606-57.781-47.823-33.755-37.184-62.519-55.032-45.862-47.917-65.17
Percentage of NetIncomeLoss-30.0-22.9-38.1-67.1764.0-22.5-28.8-30.5-28.3-26.6-39.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-66.7-51.7-64.8-55.9-41.6-48.9-85.5-77.5-66.5-72.7-98.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax srt:ConsolidationEliminations0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, wrb:InsuranceDomesticSegment


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value23019817113048140162162179145165178156181153123124134144144123139129130120114124154121138125118106999394103
Percentage of NetIncomeLoss97.186.654.985.968.2-3171.5136.098.782.780.8125.1110.386.7109.299.376.0114.2108.694.365.4113.6116.5117.785.598.097.1112.882.167.781.496.686.391.885.256.794.095.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax215.6195.4167.2146.256.8172.9172.5214.5245.2205.6247.9259.0236.9273.70.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:OperatingSegments wrb:InsuranceDomesticSegment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, wrb:ReinsuranceandMonolineExcessSegment


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value59547549102936384135
Percentage of NetIncomeLoss25.023.724.332.415.0-660.630.523.119.319.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax55.553.673.955.112.536.038.750.357.350.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:OperatingSegments wrb:ReinsuranceandMonolineExcessSegment0.00.00.00.00.00.00.00.00.00.0

Profit Loss

us-gaap:ProfitLoss

us-gaap:ProfitLoss


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value23723131215271-3.526119165217181136164180167156162109124153220108120109152123118110188180169135138115116165101108135117778311612693110118
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax222.5227.9304.8171.083.7-4.4127.3217.3297.5255.7203.9238.5274.2252.50.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ProfitLoss us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value118.8614.659-1.215-16.79339-9.1962.2780.174-1.3654.320.47-2.999-7.583-32.64-28.136-25.718-28.825-3.605-26.708-8.516-1.3874.2060.554-2.007-8.301-13.472-16.011-14.646-4.499-12.023-28.548-14.126-13.179
Percentage of ProfitLoss4.83.81.5-0.8-23.4-1121.7-7.71.40.1-0.83.20.3-1.7-4.5-20.9-17.3-23.5-23.1-2.3-12.1-7.8-1.23.80.4-1.6-7.0-12.1-8.5-8.1-2.7-8.9-20.7-12.3-11.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax10.78.74.5-1.4-19.648.8-9.83.00.2-1.96.50.7-4.5-11.40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedOtherComprehensiveIncome


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value118.8614.659-1.215-16.79339-9.1962.2780.174-1.3654.320.47-2.999-7.583-32.64-28.136-25.718-28.825-3.605-26.708-8.516-1.3874.2060.554-2.007-8.301-11.452-13.991-12.626-3.908-8.765-26.734-12.312-11.365
Percentage of ProfitLoss4.83.81.5-0.8-23.4-1121.7-7.71.40.1-0.83.20.3-1.7-4.5-20.9-17.3-23.5-23.1-2.3-12.1-7.8-1.23.80.4-1.6-7.0-10.3-7.4-7.0-2.3-6.5-19.3-10.7-9.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax10.78.74.5-1.4-19.648.8-9.83.00.2-1.96.50.7-4.5-11.40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ProfitLoss us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302011-03-312010-03-31
Value0.442.1910.340.6880.3960.8920.487-0.0570.7180.8923.9152.5230.7031.1771.6830.7640.5691.2270.880.013-0.0610.7370.1330.1290.0140.1370.240.2520.2160.0115.743-1.2140.864-0.0170.092-0.0610.0050.171
Percentage of ProfitLoss0.20.90.10.50.6-25.30.4-0.00.30.52.91.50.40.71.10.50.51.00.60.0-0.10.60.10.10.00.10.20.10.10.04.2-0.90.8-0.00.1-0.10.00.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.42.20.30.80.51.10.5-0.11.01.35.93.71.11.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:NoncontrollingInterest0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value23722931215171-4.418119165216180132161180166154162109123152220108119109152123118110188179169130136115116165100108135117778311612693110118
Percentage of ProfitLoss99.899.199.999.599.4125.399.6100.099.799.597.198.599.699.398.999.599.599.099.4100.0100.199.499.999.9100.099.999.899.999.9100.096.399.1100.7100.0100.099.999.9100.1100.0100.1100.1100.0100.099.9100.099.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax222.1225.7304.5170.283.3-5.5126.8217.4296.5254.5198.1234.9273.2250.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Share Based Compensation

us-gaap:ShareBasedCompensation

us-gaap: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
Value111111121411101112148.0638.806109.4348.6079.3751110109.1579.118.7668.0719.0796.8028.1716.5197.9347.4286.1875.6215.7687.4064.9895.6935.2438.387.4477.4486.7016.5586.4687.057.996.9885.379
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 End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-206.411-1195.231-245.764-520.84885530-232.921-254.5672041-187.781-310.039-84.94-131.484100-209.76345-269.7557.383-372.5-323.821-105.55-341.837-106.3682715.476-589.45-177.47392-133.995-169.359-4.342-515.095143-361.785101-236.385-278.594-120.801-49.10140-75.028-184.134-133.988365-10.124
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-193.2-1175.5-239.7-584.5999.538.0-247.6-335.028.558.8-281.0-449.7-128.8-198.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Payments To Acquire Real Estate

us-gaap:PaymentsToAcquireRealEstate

us-gaap:PaymentsToAcquireRealEstate


Payments
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-03-31
Value125.92924-29.786586452593582336774961489193605371664044-39.848189283560333.08910185559.8645.611-251.0558
Percentage of PaymentsToAcquireRealEstate100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-404.247528-449.64398174-221.95686-575.344-22.874-0.976-99.117-22.666-43.03157-107.714-108.879-15.737-2.756-191.313-97.08825427-7.769-28.84-409.32-109.389-222.781370-13.782-203.891-144.72-34.88747-198.642-145.823-85.917-37.573366-16.175-135.082-56.91312-154.14560-149.122-116.749
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-378.4519.5-438.6111.1204.2-273.991.4-757.0-31.3-1.4-148.3-32.9-65.3237.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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
Value0.02121212120178111180.01581860179477150.0153-0.0011514141414131401314121327120.014824110.01010119.911181.7511018
Percentage of PaymentsOfDividendsCommonStock0.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0

Dividends

us-gaap:Dividends us-gaap:StatementEquityComponents

us-gaap:Dividends

us-gaap:RetainedEarnings


Dividendsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1112121212120157201111879797917771777157677151414141413140131412131313121481212111010119.9139.96410109.189
Percentage of Dividends100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Payments For Repurchase Of Common Stock

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:PaymentsForRepurchaseOfCommonStock


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.029341296202180.00.00.0170.00.06.79919280.00.032620.0370.05.52126912.23394.5861921278.008310.06.30173480.09.51511835231518713595
Percentage of PaymentsForRepurchaseOfCommonStock0.0100.0100.0100.0100.0100.0100.00.00.00.0100.00.00.0100.0100.0100.00.00.0100.0100.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Liabilities

us-gaap:DeferredTaxLiabilities

us-gaap:DeferredTaxLiabilities


Deferred
Period End2020-12-312019-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value1317861346.811370.0507464325
Percentage of DeferredTaxLiabilities100.0100.0100.0100.0100.0100.00.0100.0100.0100.0

Deferred Tax Assets Net

us-gaap:DeferredTaxAssetsNet

us-gaap:DeferredTaxAssetsNet


Deferred
Period End2020-12-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value4133920.00.00.0369370.5763144710.00.00.04512.021290.04470.00.00.04316367-104.81447-69.968-31.665-1.7014330.0147665190
Percentage of DeferredTaxAssetsNet100.0100.00.00.00.0100.0100.0100.0100.0100.00.00.00.0100.0100.0100.00.0100.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0

Deferred Tax Assets Valuation Allowance

us-gaap:DeferredTaxAssetsValuationAllowance

us-gaap:DeferredTaxAssetsValuationAllowance


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value793335165.4574.0371.3350.00.00.02.328
Percentage of DeferredTaxAssetsValuationAllowance100.0100.0100.0100.0100.0100.0100.00.00.00.0100.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition us-gaap:StatementEquityComponents

us-gaap:AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition

us-gaap:AdditionalPaidInCapital


Adjustments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value11111312111112157.093147.9278.8158.2339.4348.629.3889.97810109.0817.5818.7697.2629.0796.1798.1717.518.0016.2526.2035.856.3375.7014.9935.6935.243
Percentage of AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AllocatedShareBasedCompensationExpenseNetOfTax

us-gaap:AllocatedShareBasedCompensationExpenseNetOfTax


Allocated
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-30
Value11121211121110.0158.09.09.09.010.0119.07.09.08.07.08.08.06.06.05.06.05.05.0
Percentage of AllocatedShareBasedCompensationExpenseNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssumedPremiumsEarned

us-gaap:AssumedPremiumsEarned


Assumed
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value259259242237232228224209198188208177180188207202193208265216225218213217211203218216224225199226217214211193186
Percentage of AssumedPremiumsEarned100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssumedPremiumsWritten

us-gaap:AssumedPremiumsWritten


Assumed
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value266307222244239266213239206216192181162192180194160215193224230246204221207204219225191240189251212231207226181200172191150193121158159
Percentage of AssumedPremiumsWritten100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CededPremiumsEarned

us-gaap:CededPremiumsEarned


Ceded
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value439412406366360366354330325318325310304296304313291251312277275259268261264256268261256243251249236222220214202
Percentage of CededPremiumsEarned100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CededPremiumsWritten

us-gaap:CededPremiumsWritten


Ceded
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value449434424383392385372343346336327303323314301302322289269261296291265251267276249253282279236243276254224218239198165180187186136134152
Percentage of CededPremiumsWritten100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CededPremiumsWritten us-gaap:RelatedPartyTransactionsByRelatedParty

wrb:LifsonRe


Ceded
Period End2021-06-302021-03-31
Value8653
Percentage of CededPremiumsWritten19.212.2

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value0.0190.0960.2610.36118
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded0.0100.0100.0100.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded us-gaap:FinancialInstrument

us-gaap:CorporateDebtSecurities


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value0.00.0160.00.2610.3616.436
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded0.00.10.0100.0100.034.0

us-gaap:ForeignGovernmentDebtSecurities


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value0.0180.0960.00.012
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded0.099.9100.00.00.066.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value-0.604-0.7740.004-0.261-19.5816
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal100.0100.0100.0100.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal us-gaap:FinancialInstrument

us-gaap:CorporateDebtSecurities


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value-0.004-0.513-0.074-0.009-3.7580.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal0.766.3-1850.03.419.20.0

us-gaap:ForeignGovernmentDebtSecurities


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value-0.6-0.2610.078-0.252-15.82216
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal99.333.71950.096.680.8100.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value0.4940.0050.014432.6443.588
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold100.0100.0100.0100.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold us-gaap:FinancialInstrument

us-gaap:CorporateDebtSecurities


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value0.00.0050.0140.372.3150.0
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold0.0100.0100.00.887.60.0

us-gaap:ForeignGovernmentDebtSecurities


Debt
Period End2021-06-302020-12-312020-09-302020-06-302020-03-31
Value0.4940.0430.3293.588
Percentage of DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold100.00.099.212.4100.0

us-gaap:DebtSecuritiesHeldToMaturityCreditLossExpenseReversal

us-gaap:DebtSecuritiesHeldToMaturityCreditLossExpenseReversal


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value-277000.0-68000.0-73000.0-77000.0841000.038000.0
Percentage of DebtSecuritiesHeldToMaturityCreditLossExpenseReversal100.0100.0100.0100.0100.0100.0

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
Value37333832392571-9.2822327542027293433261816221630192323192512252523292920381724223024112218212120
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:DirectPremiumsEarned

us-gaap:DirectPremiumsEarned


Direct
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value2151200319771877180418291846179717731723173617351705167416881692166616131667164716091568159915751545152415521505144913811435135113011240124812081163
Percentage of DirectPremiumsEarned100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DirectPremiumsWritten

us-gaap:DirectPremiumsWritten


Direct
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value239521771998201818921964182018531883182916541746178517871598167917271721158516431708170915591601160316471485155315801565140414151405140012451267124912011083111410941076933962953
Percentage of DirectPremiumsWritten100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EffectOfExchangeRateOnCashAndCashEquivalents

us-gaap:EffectOfExchangeRateOnCashAndCashEquivalents


Effect
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1.127-1.431165.48.266-20.1349.331-8.111-1.5220.6817.45917-56.8280.241-5.457.2850.87110-15.715-0.25-10.60811-27.666-28.6787.156-16.845-15.674-13.7578.812-1.441-5.61233-18.365-20.081.60520-34.8788.992-2.448-13.41920-6.173-1.5669.735-5.566-4.669
Percentage of EffectOfExchangeRateOnCashAndCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquityMethodInvestmentRealizedGainLossOnDisposal

us-gaap:EquityMethodInvestmentRealizedGainLossOnDisposal


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value-0.3470.1820.2030.91330-2.427-0.4560.0410.0170.052-0.03-0.3530.1190.04124-0.1121.26767-3.788-4.793-0.460.7087023-1.5110.52950-1.07645-0.027-0.03410191970.2772.1911.310.8220.9151.060.9650.810.640.496
Percentage of EquityMethodInvestmentRealizedGainLossOnDisposal100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1

us-gaap:CommonStock, us-gaap:FairValueInputsLevel3


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value0.7010.1260.8651.454-1.9710.881.993-0.3760.1970.191-0.260.157-0.181-0.2640.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:EquitySecurities, us-gaap:FairValueInputsLevel3


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value0.7030.1260.8681.277-1.9710.881.971-0.3870.1880.191-0.110.106-0.18-0.264-0.0110.0190.00.0-0.0120.0170.0170.0160.0-0.0510.01-0.048-0.025-0.0310.0090.03-0.02-0.005
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1100.3100.0100.387.8100.0100.098.9102.995.4100.042.367.599.4100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:PreferredStock, us-gaap:FairValueInputsLevel3


Fair
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value0.003-0.1770.00.0-0.022-0.011-0.0090.00.15-0.0510.0010.0-0.0110.0190.00.0-0.0120.0170.0170.0160.0-0.0510.01-0.048-0.025-0.0310.0090.03-0.02-0.005
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings10.3-12.2-0.00.0-1.12.9-4.60.0-57.7-32.5-0.6-0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TradingAssetsExcludingDebtAndEquitySecurities, us-gaap:FairValueInputsLevel3


Fair
Period End2021-06-302021-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value0.00.0010.0-9.140.2510.1580.0230.00.011-0.040.00.086-0.0780.00.0-0.015-0.115-0.046-0.4240.062-0.16-0.277-0.023.723-0.413-1.0162.170.103
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings10.00.80.02430.9127.482.7-8.80.0-6.115.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel3


Fair
Period End2021-06-302021-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value0.7030.1271.971-9.5550.4390.351-0.0870.106-0.173-0.302-0.010.105-0.0770.001-0.0120.003-0.0970.148-0.420.011-0.15-0.31-0.0473.698-0.373-0.9742.2190.77
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1100.3100.898.92541.2222.8183.833.567.595.6114.40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases

us-gaap:EquitySecurities, us-gaap:FairValueInputsLevel3


Fair
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value0.03.00.00.00.02.6020.00.00.00.00.00.06.9980.1750.00.00.00.00.7650.00.00.00.00.00.0140.00.00.00.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases0.0100.00.00.00.0100.00.00.00.00.00.00.0100.0100.00.00.00.00.0100.00.00.00.00.00.00.0100.00.00.00.00.0

us-gaap:PreferredStock, us-gaap:FairValueInputsLevel3


Fair
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value0.03.00.00.00.02.6020.00.00.00.00.06.9980.1750.00.00.00.00.00.00.00.00.00.00.03.430.00.00.00.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases0.0100.00.00.00.0100.00.00.00.00.00.0100.0100.00.00.00.00.00.00.00.00.00.00.00.023.20.00.00.00.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales

us-gaap:CommonStock, us-gaap:FairValueInputsLevel3


Fair
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value0.00.00.01.0660.01.5480.00.00.2270.00.00.00.00.00.00.00.00.00.00.00.3080.00.00.00.00.4560.4730.00.001-0.001
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales0.00.00.0100.00.0100.00.00.0100.00.00.00.00.00.00.00.00.00.00.00.0100.00.00.00.00.0100.0100.00.0100.0100.0

us-gaap:CorporateDebtSecurities, us-gaap:FairValueInputsLevel3


Fair
Period End2021-06-302021-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value0.01.00.00.00.00.00.00.00.00.3310.00.00.00.00.09.9979.834-4.5870.9861.19
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.02192.32079.10.098600.0-119000.0

us-gaap:DebtSecurities, us-gaap:FairValueInputsLevel3


Fair
Period End2021-06-302021-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value0.01.00.00.0120.00.122-0.0080.010.10.0150.0050.0150.0130.0150.00.00.00.3310.00.00.00.00.09.9970.664.5870.9861.19
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales0.00.00.00.80.00.0-3.50.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.02192.3139.50.098600.0-119000.0

us-gaap:EquitySecurities, us-gaap:FairValueInputsLevel3


Fair
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value0.00.00.01.0660.01.5480.00.00.2276.9980.00.00.00.00.00.00.00.00.00.00.3080.00.00.00.03.8860.517-0.0220.001-0.001
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales0.00.00.0100.00.0100.00.00.0100.00.00.00.00.00.00.00.00.00.00.00.0100.00.00.00.00.0852.2109.30.0100.0100.0

us-gaap:TradingAssetsExcludingDebtAndEquitySecurities, us-gaap:FairValueInputsLevel3


Fair
Period End2021-06-302021-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value0.00.0010.0173.686170.00.00.0110.00.00.0080.00.00.00.00.00.00.00.055710.00.014.8339.230.00.0-0.001
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales0.00.00.01108.60.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.01059.91951.40.00.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel3


Fair
Period End2021-06-302021-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value0.5611.0010.0183.686170.2197.0080.1110.0150.0050.0230.0130.0150.00.00.00.3310.3080.055710.00.0118104.6090.9871.188
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales0.00.00.01209.40.00.096.50.00.00.00.00.00.00.00.00.00.00.0100.00.00.00.00.04104.42190.90.098700.0-118800.0

us-gaap:FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease

us-gaap:FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value2228000.01239000.0406000.02876000.0-4791000.0-2139000.00-144000.0-1093000.000000000-14000.0175000.0467000.093000.0568000.0-311000.019000.0-53000.0-47000.0-57000.0-24000.016000.0463000.0171000.072000.0-30000.062000.0-65000.0-7280000.0123000.06896000.0-411000.0-9000.00000
Percentage of FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease100.0100.0100.0100.0100.0100.00.0100.0100.00.00.00.00.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.0

us-gaap:GainLossOnSaleOfOtherInvestments

us-gaap:GainLossOnSaleOfOtherInvestments


Gain
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value-19.0710.773-7.268-6.982-5.374-18.398-1.530.1731.32-0.291-0.359-0.0571.8190.5740.855141.3633.4341.656137-1.5290.644-2.417-3.3780.7877.7840.00.00.00.012-0.0160.482-0.5-0.020.00.018
Percentage of GainLossOnSaleOfOtherInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.0100.0100.0100.0100.0100.00.0100.0

us-gaap:GainLossOnSalesOfLoansNet

us-gaap:GainLossOnSalesOfLoansNet


Gain
Period End2021-06-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value-881000.00000-970000.0449000.01000.02058000.0000
Percentage of GainLossOnSalesOfLoansNet100.00.00.00.00.0100.0100.0100.0100.00.00.00.0

us-gaap:IncomeLossFromEquityMethodInvestments

us-gaap:IncomeLossFromEquityMethodInvestments


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value61385218-57.55240-8.091946111541534017503526382518161122216.061-3.5835922532211221026-13.118
Percentage of IncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeLossFromEquityMethodInvestments us-gaap:InvestmentType

us-gaap:RealEstateFunds


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value6.0724.4345.403-1.881-2.7696.791.8754.2012.60210111435261430194.5321710
Percentage of IncomeLossFromEquityMethodInvestments9.911.410.2-10.34.816.7-23.222.15.691.874.734.767.564.682.760.454.917.044.742.0

wrb:EnergyFunds


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value6.1723.322.657.279-25.3814.413-7.794-3.242-3.697-3.4030.2371.664-1.2560.074-12.763-8.6393.245
Percentage of IncomeLossFromEquityMethodInvestments10.18.55.039.944.110.996.3-17.0-7.9-29.81.64.1-2.40.2-25.2-24.312.2

wrb:FinancialServicesFunds


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value31173110-22.0915-7.51113211.5282.843
Percentage of IncomeLossFromEquityMethodInvestments51.944.059.455.838.437.592.869.546.513.418.6

wrb:OtherFunds


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
Value6.277.811101.547-0.039113.369-30.664474.3383.6282518146.0193224186.4135.8377.186.375
Percentage of IncomeLossFromEquityMethodInvestments10.220.120.08.50.128.4-41.6-161.1102.338.023.861.334.935.334.564.769.467.616.523.138.938.3

wrb:TransportationFunds


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value106.2282.9051.106-7.2732.6461.9712.6860.9348.6024.12
Percentage of IncomeLossFromEquityMethodInvestments17.916.05.56.112.66.5-24.414.12.075.427.0

us-gaap:IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions

us-gaap:IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value61385218-57.55140-8.091946111541124017168.89526382518161122216.061-18.8536625581915221026-13.1193527-17.04141-40.081134.239-53.07625-3.185
Percentage of IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInBrokerDealerRelatedReceivablesPayablesNet

us-gaap:IncreaseDecreaseInBrokerDealerRelatedReceivablesPayablesNet


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
Value86-151.77663-60.943-9.9963451-35.524-41.107221.3394111-58.54464-126.4972281-51.06317-69.64266-25.131-20.952.65235-40.09823-51.557-11.3993149-43.325105-40.644-22.554-16.146138-49.1361.675-74.98656-0.683-67.612
Percentage of IncreaseDecreaseInBrokerDealerRelatedReceivablesPayablesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInDeferredIncomeTaxes

us-gaap:IncreaseDecreaseInDeferredIncomeTaxes


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
Value118-47.372-22.89866-21.88712-23.5791933-36.18-25.1846089-50.5051.442-27.17593-50.59579-80.73838-46.7833-31.658-4.311-44.618-19.72-3.3562-70.07-81.677-21.24669-22.471-13.435-4.049-9.35613-17.808-5.298-21.447-0.392-44.211-5.4625-39.902
Percentage of IncreaseDecreaseInDeferredIncomeTaxes100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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
Value3338-5.264125.33926-10.486.9055.917-15.254-3.6864.3016.851-25.86-6.719-3.896.126-25.8831.2171733-10.3565.9711221-1.298127.461240.4951710233.813131011-1.793121022-5.5471.0266.68113
Percentage of IncreaseDecreaseInDeferredPolicyAcquisitionCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve

us-gaap:IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value402303296353325200168922311191081063.519120153209110-1012.682200131108-760.53977132152-654.159104
Percentage of IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOtherOperatingLiabilities

us-gaap:IncreaseDecreaseInOtherOperatingLiabilities


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
Value102-206.345846696-204.878-1.4028946-154.4095537102-243.22198-13.991159-177.8051114472-181.969842372-243.584856.41140-190.577-9.7688371-148.321121-26.1749-36.92857463.661-97.246924251-128.316
Percentage of IncreaseDecreaseInOtherOperatingLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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
Value22596-2.018-28.56710797-17.716-16.90467156-63.534-45.4857874-44.668-47.40710059-31.969-82.4399579-38.599-33.6866271-21.145-71.6859799-23.633-1.19386763553429711-36.733608819-47.4693335
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:IncreaseDecreaseInReinsuranceRecoverable

us-gaap:IncreaseDecreaseInReinsuranceRecoverable


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
Value72105109857543493.67892205037-23.239100247732-67.20580547426-30.3421.677144646-13.024-49.526492.410133341264429164358-43.892102-3.8063.32982-41.38
Percentage of IncreaseDecreaseInReinsuranceRecoverable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInTradingSecurities

us-gaap:IncreaseDecreaseInTradingSecurities


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
Value12316271428-2.4556.1315.6257.0447.7534.2986.9248.368-0.4972.0610.3954.79-2.355.8562.4742.686-0.3833.0163.4558.394-7.69252-14.73712-0.042101.8392.895-4.485-0.9310.82-1.4112.94639-146.904-13.415129-113.017-26.159266.342
Percentage of IncreaseDecreaseInTradingSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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
Value2532198.72914795163-35.30982118135-92.5945.26854116-117.423-18.81626113-119.604-7.528105171-55.8352456117-67.6954798198-40.1949395174-4.9229673115-26.1826150152-69.166191636
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:IncreaseDecreaseInUnearnedPremiumsNet

us-gaap:IncreaseDecreaseInUnearnedPremiumsNet


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value-240.557-200.08216-130.395-62.903-154.42856-73.096-96.623-116.74599-20.729-43.051-97.93112104.452-76.796110-21.421-82.776-136.38744-39.479-50.884-103.38946-64.578-72.131-162.26825-94.763-59.383-144.84711-89.354-43.634
Percentage of IncreaseDecreaseInUnearnedPremiumsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestPaid

us-gaap:InterestPaid


Interest
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value26455318546814626410611061106112607.141565.36856115611481148104811539.955531045104411441041
Percentage of InterestPaid100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentIncomeInterestAndDividend

us-gaap:InvestmentIncomeInterestAndDividend


Investment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value17016018314487177139162189159161187154176151144137150160147132132130135130127116180142171143127145137153117162158117114150146138119130
Percentage of InvestmentIncomeInterestAndDividend100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentIncomeInterestAndDividend us-gaap:InvestmentType

us-gaap:EquityMethodInvestments


Investment
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value385218-57.55240-8.091946111541124017158.89526382518161122216.061-3.583592253225.492221026-13.11835
Percentage of InvestmentIncomeInterestAndDividend24.328.812.6-65.922.9-5.811.724.77.19.521.98.222.911.510.56.517.724.217.113.912.68.716.916.84.8-3.132.715.731.415.74.315.57.917.5-11.121.9

us-gaap:EquitySecurities


Investment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value7.2126.183.9781.9072.7261.5631.4551.3921.3031.2881.0221.0040.5590.6460.5050.6040.6020.6390.8111.0691.280.8681.1111.1091.2241.181.3081.3692.1031.9462.3073.1923.6342.2475.4394.0013.829
Percentage of InvestmentIncomeInterestAndDividend4.23.92.21.33.10.91.00.90.70.80.60.50.40.40.30.40.40.40.50.71.00.70.90.80.90.91.10.81.51.11.62.52.51.63.53.42.4

us-gaap:RealEstate


Investment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value0.8721.1615.227.6665.0456.0966.757.9875.1744.3073.2525.5973.1746.5685.0815.0425.2864.5662.5020.5851.252.7172.0244.3892.1142.7671.0213.0423.0633.1023.1553.0863.1163.1413.4763.0973.348
Percentage of InvestmentIncomeInterestAndDividend0.50.72.85.35.83.44.84.92.72.72.03.02.13.73.43.53.93.01.60.40.92.11.63.21.62.20.91.72.21.82.22.42.12.32.32.62.1

wrb:ArbitrageTradingAccount


Investment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value3.914192519311.1388.4018.47.199107.0017.6328.3335.1912.914.4185.4576.365.816.4413.2523.195.4212.608-0.1178.9799.930.0476.9425.5196.166114.993.783-0.6522.3970.06
Percentage of InvestmentIncomeInterestAndDividend2.311.914.113.535.80.66.05.23.86.64.34.15.42.91.93.14.04.23.64.42.52.44.21.9-0.17.18.50.04.93.24.39.23.42.7-0.42.00.0

wrb:FixedMaturitySecuritiesCashCashEquivalentsandLoansReceivable


Investment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value96949597105128130125128132134131129123125118116112112114108108110104105108107117107106109104111117118121119
Percentage of InvestmentIncomeInterestAndDividend57.059.252.067.2121.172.293.977.468.182.783.570.584.070.082.882.585.274.670.177.481.782.384.777.280.785.192.564.975.862.476.281.676.485.477.1103.173.7

us-gaap:InvestmentIncomeInvestmentExpense

us-gaap:InvestmentIncomeInvestmentExpense


Investment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value2.1181.452.7821.781.9352.6292.1281.0771.0861.4561.2540.950.671.4871.8591.6191.7721.7021.5251.9913.5312.1132.5672.7542.5192.8771.9981.5993.4952.5534.3161.9071.7822.0121.7371.8121.4411.0990.8640.6661.0860.8530.6850.8041.217
Percentage of InvestmentIncomeInvestmentExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentIncomeNet us-gaap:InvestmentType

us-gaap:InvestmentIncomeNet

us-gaap:EquityMethodInvestments


Investment
Period End2021-06-302020-06-30
Value61-57.552
Percentage of InvestmentIncomeNet100.0100.0

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1


Liability
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value182973502812048421721925229536628120511139931221797439132220259
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1


Liability
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value690794599532681864765707633567593578716810565564659773470742632555
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1

us-gaap:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1


Liability
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value120311211111111411351107107210411028988102010179739639761081964979993965964922
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:MarketableSecuritiesGainLoss

us-gaap:MarketableSecuritiesGainLoss


Marketable
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value24343877-177.1741.4657368
Percentage of MarketableSecuritiesGainLoss100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments

us-gaap:MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments


Marketable
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-30
Value2051-7.77261-143.2851.465736822694818340521756.3152566271972109524333191724
Percentage of MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Marketable
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value14115.898-1.538-21.257502.8840.22-1.7280.595-3.796-9.599-50.216-43.286-39.566-44.346-5.546-41.09-13.101-2.1346.4710.852-3.087-12.771-20.726-24.632-22.532-6.921-18.497-43.92-21.933-20.075
Percentage of MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments70.821.70.019.8-34.5-34.9196.90.3-2.52.7-5.5-19.80.0-23.5-97.8-84.70.0-23.4-207.5-8.40.01.3-11.2-67.10.0-34.1-20.6-13.10.0-100.1-66.3-100.5

us-gaap:NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance

us-gaap:NoncontrollingInterest


Noncontrolling
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-30
Value-6445000.0-1502000.0-400000.0-189000.0-227000.0-237000.0-274000.052000.0-788000.0-1560000.0-603000.0-49000.0-106000.03801000.0-449000.0-235000.03158000.0-809000.0-294000.0111000.0-608000.0-304000.01526000.0-50000.0-4173000.02817000.0284000.0
Percentage of NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLeaseCost

us-gaap:OperatingLeaseCost


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value11111111101111101011
Percentage of OperatingLeaseCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLeasePayments

us-gaap:OperatingLeasePayments


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1111111111106.053111111
Percentage of OperatingLeasePayments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToNoncontrollingInterest

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Other
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-1000.00-3000.0-1000.01000.0-2000.0123000.030000.0-47000.0-132000.060000.037000.0-11000.0033000.0-33000.019000.0-125000.057000.0-5000.014000.0-68000.094000.0-10000.022000.086000.0-82000.0-19000.0-18000.0-14000.0-9000.035000.0-40000.0
Percentage of OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToNoncontrollingInterest100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-1000.00-3000.0-1000.01000.0-2000.0123000.030000.0-47000.0-132000.060000.037000.0-11000.0033000.0-33000.019000.0-125000.057000.0-5000.014000.0-68000.094000.0-10000.022000.086000.0-82000.0-19000.0-18000.0-14000.0-9000.035000.0-40000.0
Percentage of OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToNoncontrollingInterest100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value28-113.7355248395-332.85-25.769-28.592147169-4.573-96.828-40.488-160.848-9.571180-72.188156114-57.0-7.731-151.99124-90.762-25.02976112-50.669-59.814-303.16912
Percentage of OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax us-gaap:FinancialInstrument

us-gaap:DebtSecurities


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
Value28-122.5684446369-326.416-37.12-12.178146174-0.019-100.49-36.848-159.727
Percentage of OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax99.0107.884.694.393.498.1144.042.699.7103.10.4103.891.099.3

us-gaap:EquityMethodInvestments


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
Value0.762-1.025.912-0.1984.212-7.64619-16.7980.361-5.165-4.5693.669-3.638-1.134
Percentage of OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax2.60.911.2-0.41.12.3-74.958.80.2-3.199.9-3.89.00.7

us-gaap:OtherDebtSecurities


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value-0.4-0.502-2.022-1.653-0.329-14.109-5.401-6.955
Percentage of OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax-1.40.4-4.1-0.40.149.3-3.7-4.1

wrb:DebtSecuritiesPreviouslyImpaired


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-0.069101.9775.036231.541-0.0270.3840.081-0.069-0.136-0.007-0.0020.013
Percentage of OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax-0.2-9.13.710.35.9-0.50.1-1.30.1-0.03.00.00.0-0.0

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value28-113.73548395-332.85-28.592147169-96.828-40.488-160.848-8.56368-9.571-72.188156
Percentage of OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value23-90.1338318-258.981-24.745118125-94.842-32.442-125.772-8.16843-8.831-47.676105
Percentage of OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value5.532-23.6051076-73.869-3.8472843-1.986-8.046-35.076-0.39524-0.74-24.51251
Percentage of OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value11-98.9913739335-298.5315.419-27.023118127-3.591-95.312-29.443-118.189-45.71196919115-20.96811378-50.9163.943-97.61324-45.0943.0996277-20.912-10.331-182.93420
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:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value14-94.94110479356-396.72573-63.705103146-39.72-79.626-133.898-105.39-52.57848894269-40.4385776-98.947-58.592-63.986-23.213-78.629-46.2818773-19.30933-206.09-25.634
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax121.595.9276.9201.8106.4132.91365.5235.787.8115.51106.183.5454.889.2115.0243.2129.2213.759.6192.950.897.4194.3-1486.065.6-94.4174.4-1493.4139.594.892.3-329.1112.7-122.1

us-gaap:AccumulatedTranslationAdjustment


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value2.5374.05664021-98.19468-36.682-14.49219-36.12915-104.45512-6.868282022-46.804-19.47-55.87-2.047-48.031-62.53533-47.805-33.535-49.3824-4.0251.60344-23.156-46.623
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax21.5-4.1176.9101.86.432.91265.5135.7-12.215.51006.1-16.5354.8-10.815.0143.229.2113.7-40.492.9-49.2-2.694.3-1586.0-34.4-194.474.4-1593.439.5-5.2-7.7-429.112.7-222.1

us-gaap:OtherComprehensiveIncomeLossBeforeTax

us-gaap:OtherComprehensiveIncomeLossBeforeTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value31-109.68511989417-431.04442-65.274132189-40.702-81.142-144.943-148.049-126.441208813133-91.658100112-105.031-70.266-118.364-23.269-121.19-71.301104109-44.051-12.696-323.535-31.816
Percentage of OtherComprehensiveIncomeLossBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax

us-gaap:AccumulatedTranslationAdjustment


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value2.5374.054021-98.194-36.682-14.4921915-104.45512282022-19.47-55.87
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossTax

us-gaap:OtherComprehensiveIncomeLossTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value5.532-23.605101076-73.869-21.992-3.8472843-5.302-1.986-8.046-35.076-41.223-0.395240.7419724-51.572-37.535-122.9981252-8.2458411-29.278-39.664-255.79519105-5.183
Percentage of OtherComprehensiveIncomeLossTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax


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
Value23-90.134238318-258.981-3.777-24.7451181250.729-94.842-32.442-125.772-78.35-8.16843-8.831112-47.67610576-46.714.497-99.6216-58.566-12.9124872-32.935-38.879-197.067.8135795553523992-6.217-93.6731257643
Percentage of OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value23-100.4853035295-260.521-3.752-25.0051181250.733-94.775-32.403-125.796-78.34-8.19642-8.913113-46.84810376784.559-99.6416-58.43-13.1174872-33.114-39.083-189.554-0.04-39.3563
Percentage of OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax100.3111.572.791.792.6100.699.3101.1100.0100.0100.599.999.9100.0100.0100.398.2100.9100.698.398.8100.1-168.4101.4100.0100.199.8101.699.799.5100.5100.596.2-0.5-109.779.4

us-gaap:OtherCostAndExpenseOperating

us-gaap:OtherCostAndExpenseOperating


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
Value647616637593580578601581591588601577593610615600616603625606581582591573573551563544534515520504494481467451448431428405402384388369370367
Percentage of OtherCostAndExpenseOperating100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsForLossesAndLossAdjustmentExpense

us-gaap:PaymentsForLossesAndLossAdjustmentExpense


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value872892949814886948983926885863960860922921964876877871910874853815
Percentage of PaymentsForLossesAndLossAdjustmentExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsForProceedsFromLoansReceivable

us-gaap:PaymentsForProceedsFromLoansReceivable


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
Value37-9.256-0.265-0.2391.914-2.877-0.325-3.016-0.8660.726-1.141-1.96518-2.0585.439-21.84-7.587-3.147-7.199-28.861-6.53-123.737-13.1726-21.357-41.244-21.288-312.39128229-68.38252-6.551531844-32.04893-20.373-28.103-38.891-4.809-1.066-16.09-3.781-2.38
Percentage of PaymentsForProceedsFromLoansReceivable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsForProceedsFromOtherInvestingActivities

us-gaap:PaymentsForProceedsFromOtherInvestingActivities


Payments
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value20000.01000.0-86000.0-45000.000
Percentage of PaymentsForProceedsFromOtherInvestingActivities100.0100.0100.0100.00.00.0

us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesDebt

us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesDebt


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value2148411814771884159125981499121911041528149011241977208514103365139717671260204112061032106712191073109411931064902113199998413178961106851
Percentage of PaymentsToAcquireAvailableForSaleSecuritiesDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesEquity

us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesEquity


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
Value7469175420.33135106246.53535-1.4490.0424410160.6840.103750.8891251.108-8.22829-0.3398.8822.601-19.8782919-28.272737635663311668485.196202470922010
Percentage of PaymentsToAcquireAvailableForSaleSecuritiesEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PremiumReceivableCreditLossExpenseReversal

us-gaap:PremiumReceivableCreditLossExpenseReversal


Premium
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value544000.01381000.0-150000.0927000.0582000.0431000.0
Percentage of PremiumReceivableCreditLossExpenseReversal100.0100.0100.0100.0100.0100.0

us-gaap:PremiumsWrittenNet

us-gaap:PremiumsWrittenNet


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
Value221220501797187917391845166017491743170915191624162416651478157115641646151016071642166314991571154315751455152514891525135714231341137612281275119012031090112610571083918986961983
Percentage of PremiumsWrittenNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromIssuanceOfDebt

us-gaap:ProceedsFromIssuanceOfDebt


Proceeds
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302013-09-30
Value-4.326914482944.2590.00.00.0-1.933191810.00.00.0-2.053278110-1.8583.7490.0426-22.5
Percentage of ProceedsFromIssuanceOfDebt100.0100.0100.0100.0100.00.00.00.0100.0100.0100.00.00.00.0100.0100.0100.0100.0100.00.0100.0100.0

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value153316239871017803105565578780368671865112079769619720.08880.09977364552711192879655718673667546473683893667631736
Percentage of ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities


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
Value-5.222-1.503-37.76-14.325-3.936-0.204-0.641-15.202-4.572-0.976-13.502-2.475-1.219-0.544-2.208-2.5750.021-1.281-2.447-0.45-4.0843.1581.743-3.2531.095-1.187-0.578-0.45-0.2591.6240.1520.017-0.3657.63816-3.7019.05410130.2020.1410.2150.019-0.004-0.204-0.028
Percentage of ProceedsFromPaymentsForOtherFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromRepaymentsOfDebt

us-gaap:ProceedsFromRepaymentsOfDebt


Proceeds
Period End2021-06-302021-03-312020-09-302019-12-312019-09-302013-03-312012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-395230000.0-110000000.0-301290000.0-7951000.0-448410000.0-206280000.01684000.0-1684000.0-1310000.0-624000.04296000.0-3672000.02475000.0-154380000.0-3203000.0-7572000.0
Percentage of ProceedsFromRepaymentsOfDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromSaleOfAvailableForSaleSecuritiesDebt

us-gaap:ProceedsFromSaleOfAvailableForSaleSecuritiesDebt


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value35811153063311620157475121346973683687692004953101113497191365357334381622-28.342327466863318432845333592463288178
Percentage of ProceedsFromSaleOfAvailableForSaleSecuritiesDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromSaleOfAvailableForSaleSecuritiesEquity

us-gaap:ProceedsFromSaleOfAvailableForSaleSecuritiesEquity


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
Value415747-0.272615.311391.6061.34137481651311525847375119108121.88-7.9450.231139.7853.323-2.6621066.4574515528381761623732471137635814613.109
Percentage of ProceedsFromSaleOfAvailableForSaleSecuritiesEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProvisionForLoanLossesExpensed

us-gaap:ProvisionForLoanLossesExpensed


Provision
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value-2228000.0-1239000.0-406000.0-2876000.04791000.02139000.0
Percentage of ProvisionForLoanLossesExpensed100.0100.0100.0100.0100.0100.0

us-gaap:ProvisionForLoanLossesExpensed us-gaap:FinancingReceivablePortfolioSegment

us-gaap:CommercialPortfolioSegment


Provision
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value-2121000.0-1164000.0-330000.0-317000.01908000.01301000.0
Percentage of ProvisionForLoanLossesExpensed95.293.981.311.039.860.8

us-gaap:CommercialRealEstatePortfolioSegment


Provision
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value-107000.0-75000.0-76000.0-2559000.02883000.0838000.0
Percentage of ProvisionForLoanLossesExpensed4.86.118.789.060.239.2

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax us-gaap:StatementEquityComponents

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Reclassification
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-11.449-8.861-4.6591.21516-39.559.196-2.278-0.1741.365-4.32-0.472.999-7.583197-28.136-25.718-28.82576-26.708-8.516-1.387150.554-2.007-8.30183-16.011-14.646-4.499123-28.548-14.126-13.179
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedOtherComprehensiveIncome


Reclassification
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-11.449-8.861-4.6591.21516-39.559.196-2.278-0.1741.365-4.32-0.472.999-7.583197-28.136-25.718-28.82576-26.708-8.516-1.387150.554-2.007-8.30172-13.991-12.626-3.908109-26.734-12.312-11.365
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.086.587.486.286.988.693.687.286.2

us-gaap:ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded

us-gaap:ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded


Reinsurance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value255298277209232235252172239173243186161238176247142352002131671261271231311181561288910011618614211021911410985129134801146388135
Percentage of ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ReinsuranceRecoverableCreditLossExpenseReversal

us-gaap:ReinsuranceRecoverableCreditLossExpenseReversal


Reinsurance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value-90000.0-428000.060000.0566000.0375000.0183000.0
Percentage of ReinsuranceRecoverableCreditLossExpenseReversal100.0100.0100.0100.0100.0100.0

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability


Right
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.033.2311.3442.6821.6121.786232.9184.966
Percentage of RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised

us-gaap:TreasuryStock


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value0.7910.2489.5370.8831.3388.8042.0490.455106.4750.48824
Percentage of StockIssuedDuringPeriodValueStockOptionsExercised100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense


Supplemental
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value119311151104110611251097105010271008971100910019599569641072967958987960961916
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense

us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense


Supplemental
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value1.03.0-11.3735.03.04.0173.07.07.0-20.1698.07.012-36.1657.4212.0-71.904131612
Percentage of SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:TreasuryStockValueAcquiredCostMethod us-gaap:StatementEquityComponents

us-gaap:TreasuryStockValueAcquiredCostMethod

us-gaap:TreasuryStock


Treasury
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.029341296202180.00.00.0170.00.06.79919280.00.032620.0370.05.52126918.614334.5861921278.008310.06.373486.5329.51511835231518713595
Percentage of TreasuryStockValueAcquiredCostMethod0.0100.0100.0100.0100.0100.0100.00.00.00.0100.00.00.0100.0100.0100.00.00.0100.0100.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:UnrealizedGainLossOnInvestments

us-gaap:UnrealizedGainLossOnInvestments


Unrealized
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value-18.239-24.3353061-154.4674.2266942-131.513-54.652-94.2050.00.00.0
Percentage of UnrealizedGainLossOnInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0

wrb:AdjustmentstoAdditionalPaidinCapitalStockIssuedDuringPeriodValueStockOptionsExercisedValueRestrictedStockIssuedNetofTaxBenefitExpense us-gaap:StatementEquityComponents

wrb:AdjustmentstoAdditionalPaidinCapitalStockIssuedDuringPeriodValueStockOptionsExercisedValueRestrictedStockIssuedNetofTaxBenefitExpense

us-gaap:AdditionalPaidInCapital


Adjustmentsto
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value-0.5970.5251123-1.2044.591.711282.0490.4552.857115.1550.4870.912250.6890.6670.1733.23-0.4610.652-7.938230.6171.678-1.8980.6912.3543.3382.571-1.117-0.5440.23346-12.591
Percentage of AdjustmentstoAdditionalPaidinCapitalStockIssuedDuringPeriodValueStockOptionsExercisedValueRestrictedStockIssuedNetofTaxBenefitExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

wrb:AvailableforSaleandHeldtoMaturityRealizedGainsDebtSecuritiesExcludingOtherthanTemporaryImpairmentsandAllowances

wrb:AvailableforSaleandHeldtoMaturityRealizedGainsDebtSecuritiesExcludingOtherthanTemporaryImpairmentsandAllowances


Availablefor
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value5.448.244.2333.811144.931132.13.1575.2463.342.1527.921136.4228.7637.4275.6055.243331023151.3413.6124.14621131.9412.0629.217199.147109.2494.4395.652
Percentage of AvailableforSaleandHeldtoMaturityRealizedGainsDebtSecuritiesExcludingOtherthanTemporaryImpairmentsandAllowances100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

wrb:AvailableforSaleandHeldtoMaturityRealizedLossesDebtSecuritiesExcludingOtherthanTemporaryImpairmentsandAllowances

wrb:AvailableforSaleandHeldtoMaturityRealizedLossesDebtSecuritiesExcludingOtherthanTemporaryImpairmentsandAllowances


Availablefor
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value2.2362.0712.853399.2344.8471.7574.9843.3773.5183.1212.7474.1253.741.180.1970.03.9650.8641.151.482.941.2552.1710.4841.0770.6932.2080.4641.5982.4650.7395.55.9662.1931.9371.763
Percentage of AvailableforSaleandHeldtoMaturityRealizedLossesDebtSecuritiesExcludingOtherthanTemporaryImpairmentsandAllowances100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

wrb:AvailableforsaleSecuritiesGrossRealizedGainLossEquitySecuritiesExcludingOtherthanTemporaryImpairments

wrb:AvailableforsaleSecuritiesGrossRealizedGainLossEquitySecuritiesExcludingOtherthanTemporaryImpairments


Availableforsale
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value6.2568.572-0.1765.7270.0-0.011-0.00623149119122443432421.1648.4414.4710.1250.0-0.021-0.0429.702-1.0149.729236.45711251815381418
Percentage of AvailableforsaleSecuritiesGrossRealizedGainLossEquitySecuritiesExcludingOtherthanTemporaryImpairments100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

wrb:ChangeinUnrealizedGainlossonInvestmentsIncludingPortionAttributabletoNoncontrollingInterest

wrb:ChangeinUnrealizedGainlossonInvestmentsIncludingPortionAttributabletoNoncontrollingInterest


Changein
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value1000.003000.01000.0-1000.02000.0-123000.0-30000.047000.0132000.0-60000.0-37000.011000.00-5000.05000.0-19000.07000.0-57000.05000.0-14000.068000.0-94000.010000.0-22000.0-86000.082000.019000.018000.014000.09000.0-35000.040000.06000.043000.05000.0
Percentage of ChangeinUnrealizedGainlossonInvestmentsIncludingPortionAttributabletoNoncontrollingInterest100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

wrb:ChangeinUnrealizedGainlossonInvestmentsIncludingPortionAttributabletoNoncontrollingInterestNetofTax

wrb:ChangeinUnrealizedGainlossonInvestmentsIncludingPortionAttributabletoNoncontrollingInterestNetofTax


Changein
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value23-90.134238318-258.98-3.779-24.6221181250.425-94.682-32.333-125.783-78.35-8.13543-8.812112-47.61810576-46.784.593-99.6316-58.48-12.9944872-32.949-38.888-197.0257.77-39.216439
Percentage of ChangeinUnrealizedGainlossonInvestmentsIncludingPortionAttributabletoNoncontrollingInterestNetofTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

wrb:ChangeinUnrealizedGainlossonInvestmentstax

wrb:ChangeinUnrealizedGainlossonInvestmentstax


Changein
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value5.532-23.605101076-73.869-21.992-3.8472843-5.13-2.086-8.118-35.076-41.223-0.42324-0.7460-24.4935137-10.29-12.229-52.378.245-32.196-12.1172839-16.762-16.884-103.418-0.994-20.0343420
Percentage of ChangeinUnrealizedGainlossonInvestmentstax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

wrb:DebtSecuritiesAllowanceforCreditLossPeriodIncreaseDecrease

wrb:DebtSecuritiesAllowanceforCreditLossPeriodIncreaseDecrease


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-06-302019-03-31
Value1.375-18.159-0.0134321-31.750.00.0
Percentage of DebtSecuritiesAllowanceforCreditLossPeriodIncreaseDecrease100.0100.0100.0100.0100.0100.00.00.0

wrb:ExpensesFromWhollyOwnedInvestees

wrb:ExpensesFromWhollyOwnedInvestees


Expenses
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value106861288576941221018890126937569104866866847811695108100988910997101911151038189746654517164555347604948
Percentage of ExpensesFromWhollyOwnedInvestees100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

wrb:FavorableReserveDevelopmentNetOfPremiumOffsets us-gaap:StatementBusinessSegments

wrb:FavorableReserveDevelopmentNetOfPremiumOffsets

wrb:InsuranceDomesticSegment


Favorable
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value6.06.05.07.14.97.02.81.07.69.68.08.510166.0122326
Percentage of FavorableReserveDevelopmentNetOfPremiumOffsets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

wrb:IncomeBeforeIncomeTaxes

wrb:IncomeBeforeIncomeTaxes


Income
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value299296206105-6.46820227322920922921022616018433115817415622817816816227826324718119815816023213314818715097110160175121145160
Percentage of IncomeBeforeIncomeTaxes100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

wrb:IncomeBeforeIncomeTaxes us-gaap:ConsolidationItems

srt:ConsolidationEliminations


Income
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-90.208-64.529-73.067-61.548-41.755-47.736-78.344-68.585-54.759-59.744-81.094
Percentage of IncomeBeforeIncomeTaxes-30.1-21.8-35.4-58.4645.6-23.5-28.6-29.9-26.2-26.1-38.4

wrb:IncomeBeforeIncomeTaxes us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, wrb:InsuranceDomesticSegment


Income
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value29125717876175202225184226198229198171186199217215183205190191175166188228176202182172152141153132144
Percentage of IncomeBeforeIncomeTaxes97.186.886.772.6-2720.399.782.580.4108.486.4108.50.075.8115.6108.50.065.0115.8117.9121.883.798.798.9116.182.067.181.7100.686.996.088.266.199.197.4

us-gaap:OperatingSegments, wrb:ReinsuranceandMonolineExcessSegment


Income
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value7468611236465244
Percentage of IncomeBeforeIncomeTaxes24.923.229.811.9-564.523.119.219.5

wrb:InvestmentsAllowanceforCreditLossPeriodIncreaseDecrease

wrb:InvestmentsAllowanceforCreditLossPeriodIncreaseDecrease


Investments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-06-302019-03-31
Value3.603-16.920.3934616-33.8890.00.0
Percentage of InvestmentsAllowanceforCreditLossPeriodIncreaseDecrease100.0100.0100.0100.0100.0100.00.00.0

wrb:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsUndiscountedBasisPriorYearsIncreaseDecrease

wrb:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsUndiscountedBasisPriorYearsIncreaseDecrease


Liability
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value115.02.0114.04.07.03.012-3.05.7384.1320.53-6.66262-15.736-19.7144.841104
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsUndiscountedBasisPriorYearsIncreaseDecrease100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

wrb:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredLossReserveDiscountAccretion

wrb:LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredLossReserveDiscountAccretion


Liability
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-8.121-7.278-7.807-9.677-8.361-9.297-9.802-8.669-10.214-10.363-9.3-11.12-10.342-10.62-9.534-10.07-36.55812-12.004-13.544-12.263-11.273
Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredLossReserveDiscountAccretion100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

wrb:LiabilityforUnpaidClaimsandClaimsAdjustmentExpenseForeignExchangeTranslation

wrb:LiabilityforUnpaidClaimsandClaimsAdjustmentExpenseForeignExchangeTranslation


Liabilityfor
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-1.374-14.779672431-77.16726-47.227-2.065-0.163-16.777-28.72-74.8522.501-3.533201323-39.96713-40.52820
Percentage of LiabilityforUnpaidClaimsandClaimsAdjustmentExpenseForeignExchangeTranslation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

wrb:LiabilityforUnpaidClaimsandClaimsAdjustmentExpenseIncurredClaimsAdjustment

wrb:LiabilityforUnpaidClaimsandClaimsAdjustmentExpenseIncurredClaimsAdjustment


Liabilityfor
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-2.3890.8590.2221.201-1.617-0.433-11.739-5.576-10.283-6.481-1.569-5.508-3.3363.582-2.4831.19-2.2698.7276.3868.0079.915.601
Percentage of LiabilityforUnpaidClaimsandClaimsAdjustmentExpenseIncurredClaimsAdjustment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

wrb:MarketableSecuritiesRealizedGainLossExcludingOtherthanTemporaryImpairmentsNetofTax

wrb:MarketableSecuritiesRealizedGainLossExcludingOtherthanTemporaryImpairmentsNetofTax


Marketable
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value18283059-139.9671.158585417553811926341144.1064.773-5.3173517121346703411282112751415
Percentage of MarketableSecuritiesRealizedGainLossExcludingOtherthanTemporaryImpairmentsNetofTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

wrb:OperatingLeaseRightOfUseAssetAccumulatedDepreciation

wrb:OperatingLeaseRightOfUseAssetAccumulatedDepreciation


Operating
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value4.7324.896.0427.1566.62-0.065.5043.4274.3916.9693.815
Percentage of OperatingLeaseRightOfUseAssetAccumulatedDepreciation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

wrb:OtherComprehensiveIncomeLossSecuritiesAvailableforSaleWithAllowanceforCreditLossUnrealizedHoldingGainLossArisingDuringPeriodafterTax us-gaap:StatementEquityComponents

wrb:OtherComprehensiveIncomeLossSecuritiesAvailableforSaleWithAllowanceforCreditLossUnrealizedHoldingGainLossArisingDuringPeriodafterTax

us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value-0.069103.159231.5410.3830.082-0.069
Percentage of OtherComprehensiveIncomeLossSecuritiesAvailableforSaleWithAllowanceforCreditLossUnrealizedHoldingGainLossArisingDuringPeriodafterTax100.0100.0100.0100.0100.0100.0100.0100.0

wrb:OtherRevenues

wrb:OtherRevenues


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value156148317148173-55.5711211271881851721481761491943071441511922881671491391961691481672002401741741791441382161171071211481091041051038985
Percentage of OtherRevenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

wrb:OtherRevenues us-gaap:ConsolidationItems

srt:ConsolidationEliminations


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value12410599871131141001041068781
Percentage of OtherRevenues79.370.967.350.5-203.689.753.655.971.849.854.8

wrb:OtherRevenues us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, wrb:InsuranceDomesticSegment


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
Value8.2128.2799.6589.4638.0188.4739.30811131315191818860.0221820222726232324252426262827262726262627
Percentage of OtherRevenues5.35.63.06.44.6-15.27.69.17.37.19.113.110.612.744.60.016.012.110.87.916.517.916.911.714.417.214.713.211.216.515.514.519.119.312.022.225.2

wrb:PaymentForStockOptionsExercisedNet

wrb:PaymentForStockOptionsExercisedNet


Payment
Period End2021-03-312020-03-312019-03-31
Value525000.03321000.00
Percentage of PaymentForStockOptionsExercisedNet100.0100.00.0

wrb:PaymentsForProceedsFromRealEstate

wrb:PaymentsForProceedsFromRealEstate


Payments
Period End2021-06-302021-03-312020-06-302020-03-31
Value-192.328-9.7875.92924
Percentage of PaymentsForProceedsFromRealEstate100.0100.0100.0100.0

wrb:PaymentstoAcquirePropertyPlantandEquipmentNet

wrb:PaymentstoAcquirePropertyPlantandEquipmentNet


Paymentsto
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value37107.1248.0418.3691458-9.0027.5053.299
Percentage of PaymentstoAcquirePropertyPlantandEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

wrb:ProceedsFromPaymentsToEquityMethodInvestments

wrb:ProceedsFromPaymentsToEquityMethodInvestments


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value5236-86.97716-31.96997.34219010-13.874-76.131.491-38.6913321560-11.29
Percentage of ProceedsFromPaymentsToEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

wrb:RealEstateRealizedGainLossOnDisposal

wrb:RealEstateRealizedGainLossOnDisposal


Real
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value49123.841-7.137-0.6870.4173.021
Percentage of RealEstateRealizedGainLossOnDisposal100.0100.0100.0100.0100.0100.0100.0

wrb:RealizedGainLossonInvestmentsIncludingEquityMethodInvestmentsExcludingOtherthanTemporaryImpairmentsandAllowances

wrb:RealizedGainLossonInvestmentsIncludingEquityMethodInvestmentsExcludingOtherthanTemporaryImpairmentsandAllowances


Realized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value2051162-7.77261-143.285-22.9881.465736819226948591834052771756.3152512662719207210952304333191161724
Percentage of RealizedGainLossonInvestmentsIncludingEquityMethodInvestmentsExcludingOtherthanTemporaryImpairmentsandAllowances100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

wrb:RealizedGainLossonMarketableSecuritiesEquityMethodInvestmentsandOtherInvestmentsBeforeTax

wrb:RealizedGainLossonMarketableSecuritiesEquityMethodInvestmentsandOtherInvestmentsBeforeTax


Realized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value24341633877-177.174-22.9881.465736814226948591834052771756.3157.343-8.181532719207210952244333191162224
Percentage of RealizedGainLossonMarketableSecuritiesEquityMethodInvestmentsandOtherInvestmentsBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

wrb:RealizedGainLossonMarketableSecuritiesEquityMethodInvestmentsandOtherInvestmentsNetofTax

wrb:RealizedGainLossonMarketableSecuritiesEquityMethodInvestmentsandOtherInvestmentsNetofTax


Realized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value18281283059-139.967-18.1611.157585411175538381192634501144.1054.773-5.3173517121346703411282112751415
Percentage of RealizedGainLossonMarketableSecuritiesEquityMethodInvestmentsandOtherInvestmentsNetofTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

wrb:RealizedGainLossonMarketableSecuritiesEquityMethodInvestmentsandOtherInvestmentsTax

wrb:RealizedGainLossonMarketableSecuritiesEquityMethodInvestmentsandOtherInvestmentsTax


Realized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value5.2645.887358.85518-37.207-4.8270.30815142.9524.6914102064141827612.212.57-2.864189.6456.6657.2352538181315116.989417.4158.436
Percentage of RealizedGainLossonMarketableSecuritiesEquityMethodInvestmentsandOtherInvestmentsTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

wrb:RevenuesFromWhollyOwnedInvestees

wrb:RevenuesFromWhollyOwnedInvestees


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
Value109871328775931231018991130957670101896965848012310111510710592111101104921221098391736855497265565347615251
Percentage of RevenuesFromWhollyOwnedInvestees100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

wrb:RightOfUseAssetsReducedObtainedInExchangeForNewLeaseLiabilities

wrb:RightOfUseAssetsReducedObtainedInExchangeForNewLeaseLiabilities


Right
Period End2021-06-302020-06-30
Value-181000.02682000.0
Percentage of RightOfUseAssetsReducedObtainedInExchangeForNewLeaseLiabilities100.0100.0

wrb:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodFairValue us-gaap:AwardType

wrb:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodFairValue

us-gaap:RestrictedStockUnitsRSU


Share
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-30
Value0.0350.04590.00.057590.2480.06560.6730.29580.2760.129560.6780.286530.5990.503490.390.6891.6450.7971.51574
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodFairValue100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

wrb:UnfavorableReserveDevelopmentNetOfPremiumOffsets

wrb:UnfavorableReserveDevelopmentNetOfPremiumOffsets


Unfavorable
Period End2021-03-31
Value3.0
Percentage of UnfavorableReserveDevelopmentNetOfPremiumOffsets100.0

wrb:UnfavorableReserveDevelopmentNetOfPremiumOffsets us-gaap:StatementBusinessSegments

wrb:ReinsuranceandMonolineExcessSegment


Unfavorable
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1.02.11.93.01.0-2.60.72.9
Percentage of UnfavorableReserveDevelopmentNetOfPremiumOffsets0.00.00.00.00.00.00.00.0

us-gaap:AccruedInvestmentIncomeReceivable

us-gaap:AccruedInvestmentIncomeReceivable


Accrued
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value122123120128128140138144140150144148141143136139136135127133127130123128129139120138123130118128126126127131135132133133139135138130
Percentage of AccruedInvestmentIncomeReceivable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetsFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:AssetsFairValueDisclosure

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value1059881639460503618538614555494442633726745814685768660654347455274286259437321360306357384351490509514
Percentage of AssetsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value15778156631439414373136291397614429144631400913897137861385013587137351383114197139001402513404139301318212888125771252312826132891282913087125731246011919119271208311969
Percentage of AssetsFairValueDisclosure1489.11777.52251.63121.82708.92260.52678.02353.62523.12808.33112.62186.21871.51841.71698.72069.71809.52123.12048.84005.02895.14691.24392.24820.12930.14128.43557.24274.83513.93242.03388.02433.62372.92327.6

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value18181917131515153916291219232013121212111211111213873542444349515662
Percentage of AssetsFairValueDisclosure1.82.13.13.82.72.52.92.57.13.36.82.02.73.22.52.01.71.91.93.42.74.24.24.93.227.110.014.012.411.414.110.411.012.1

us-gaap:AssetsFairValueDisclosure us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-312013-12-31
Value1685716563150531485114146146101498315093146041440814259144971433314504146661489614681146981407114290136501317412875127961322512320
Percentage of AssetsFairValueDisclosure1590.81879.62354.63225.62811.62363.02780.92456.22630.12911.63219.42288.31974.31944.91801.22171.71911.12225.02150.74108.42997.84795.44496.44925.03667.13502.1

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value152761505313682134621294013739138971376613400134551359613561131061319413242134791310713061128691301912311122181201211886119171202612122117801148211467111901112311100108511111511038110591085810639105781073310737
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis us-gaap:ConsolidatedEntities

srt:ParentCompany


Available
Period End2020-12-312019-12-312018-12-31
Value7927181317
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis5.85.29.7

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis us-gaap:FinancialInstrument

srt:IndustrialProperty


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value30192986245622401922217522602298217821122295
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis19.819.818.016.614.915.816.316.716.315.716.9

us-gaap:AssetBackedSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value43333952321833473170312328022758271926582462
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis28.426.323.524.924.522.720.220.020.319.818.1

us-gaap:CommercialMortgageBackedSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value137172181199211284304356303351345
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis0.91.11.31.51.62.12.22.62.32.62.5

us-gaap:CorporateDebtSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value51865083446940703633400940384022394939474188
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis34.033.832.730.228.129.229.129.229.529.330.8

us-gaap:Corporation


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value156164206223224254255243238252272
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis1.01.11.51.71.71.91.81.81.81.92.0

us-gaap:DebtSecurities


Available
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value21952153228323432371232223922396
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis16.316.616.616.917.217.317.817.6

us-gaap:DomesticCorporateDebtSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value15831517151314711399148214471397143114751502
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis10.410.111.110.910.810.810.410.210.711.011.1

us-gaap:ForeignGovernmentDebtSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value11031072993889918809924841818820822
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis7.27.17.36.67.15.96.76.16.16.16.0

us-gaap:MortgageBackedSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value909106299410481125145316021680154615781609
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis6.07.17.37.88.710.611.512.211.511.711.8

us-gaap:OtherAggregatedInvestments


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value1771531093218245.21919274260
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis1.21.00.80.20.10.20.00.10.20.30.4

us-gaap:PublicUtilityBonds


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value406426389325293327325306312317330
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis2.72.82.82.42.32.42.32.22.32.42.4

us-gaap:ResidentialMortgageBackedSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value771889813848913116912981323124212261264
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis5.15.95.96.37.18.59.39.69.39.19.3

us-gaap:RevenueSubjectToRefund


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value225231250257299311364280298337408
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis1.51.51.81.92.32.32.62.02.22.53.0

us-gaap:SovereignDebtLocalGovernmentUnspecified


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value419432410396394412432426427406403
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis2.72.93.02.93.03.03.13.13.23.03.0

us-gaap:SovereignDebtStateGovernmentUnspecified


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value378399417356350365359340320334335
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis2.52.73.12.62.72.72.62.52.42.52.5

us-gaap:USStatesAndPoliticalSubdivisions


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value32543340342134303422362737543662360737223815
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis21.322.225.025.526.426.427.026.626.927.728.1

us-gaap:USTreasuryAndGovernment


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value488541586676670715775800760728697
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis3.23.64.35.05.25.25.65.85.75.45.1

wrb:SpecialRevenue


Available
Period End2021-06-302021-03-312020-12-312019-12-312018-12-31
Value20742112213723432396
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis13.614.015.616.917.6

us-gaap:AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax us-gaap:FairValueByMeasurementBasis

us-gaap:AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax

us-gaap:EstimateOfFairValueFairValueDisclosure


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value9694124108855216520318811776101232285375
Percentage of AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax us-gaap:FairValueByMeasurementBasis, us-gaap:FinancialInstrument

us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:CommonStock


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value8860288.0425.7396.71816148.0927.0524.335
Percentage of AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax91.364.423.17.46.712.910.37.34.36.05.7

us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:PreferredStock


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value8.3983395100794514818818011072
Percentage of AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax8.735.676.992.693.387.189.792.795.794.094.3

us-gaap:AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax us-gaap:FairValueByMeasurementBasis

us-gaap:AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax

us-gaap:EstimateOfFairValueFairValueDisclosure


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value298.97114344271293726252610109.1924.557
Percentage of AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax us-gaap:FairValueByMeasurementBasis, us-gaap:FinancialInstrument

us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:CommonStock


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value5.9568.345143133602633211919
Percentage of AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax20.293.096.691.379.285.087.989.579.874.974.5

us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:PreferredStock


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value230.6260.4923.0038.764103.5993.915.3776.4296.751
Percentage of AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax79.87.03.48.720.815.012.110.520.225.125.5

us-gaap:AvailableForSaleEquitySecuritiesAmortizedCostBasis us-gaap:FairValueByMeasurementBasis

us-gaap:AvailableForSaleEquitySecuritiesAmortizedCostBasis

us-gaap:EstimateOfFairValueFairValueDisclosure


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value575536516361319375345277254249228234250219206
Percentage of AvailableForSaleEquitySecuritiesAmortizedCostBasis100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleEquitySecuritiesAmortizedCostBasis us-gaap:FairValueByMeasurementBasis, us-gaap:FinancialInstrument

us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:CommonStock


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value367339335184144200175166153148113
Percentage of AvailableForSaleEquitySecuritiesAmortizedCostBasis63.863.365.050.945.353.451.060.060.259.449.6

us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:PreferredStock


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value208196180177174174169111101101115
Percentage of AvailableForSaleEquitySecuritiesAmortizedCostBasis36.236.735.049.154.746.649.040.039.840.650.4

us-gaap:AvailableForSaleSecurities us-gaap:FairValueByMeasurementBasis

us-gaap:AvailableForSaleSecurities

us-gaap:CarryingReportedAmountFairValueDisclosure


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value642621625435362356480443416341279325472496576614612611669158286141150177153174170222257322283338434376
Percentage of AvailableForSaleSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EstimateOfFairValueFairValueDisclosure


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value642621625435362356480443416341279325472496576614612611669158286141150177153174170222257322283338434376
Percentage of AvailableForSaleSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue us-gaap:FinancialInstrument

us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue

us-gaap:AssetBackedSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value31882456204621081943262915291399158218482030
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CorporateDebtSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value10161527652676581194142835646815162685
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue31.962.231.932.129.973.828.025.529.682.0132.2

us-gaap:DebtSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value51575033330034083060614133412902305753387861
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue161.8204.9161.3161.6157.4233.6218.4207.4193.1288.8387.2

us-gaap:ForeignGovernmentDebtSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value388329149133117139271237214263326
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue12.213.47.36.36.05.317.817.013.614.316.1

us-gaap:MortgageBackedSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value2963522361451126964814203577701046
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue9.314.411.66.95.826.531.530.122.641.751.5

us-gaap:USStatesAndPoliticalSubdivisions


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value2283081682292627154923653347281446
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue7.212.68.210.913.527.232.226.121.239.471.2

us-gaap:USTreasuryAndGovernment


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value395847115422013612198210326
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue1.22.42.35.52.20.89.08.76.211.416.1

us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue us-gaap:FinancialInstrument, us-gaap:InvestmentSecondaryCategorization

us-gaap:AssetBackedSecurities, wrb:NoninvestmentGradeInvestmentsatLossLessthan5Million


Available
Period End2021-06-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value0.1130.2790.3611.3111014
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue0.00.00.00.10.70.8

us-gaap:CorporateDebtSecurities, wrb:NoninvestmentGradeInvestmentsatLossLessthan5Million


Available
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value3625284755326583
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue1.11.01.42.42.12.44.24.5

us-gaap:ForeignGovernmentDebt, wrb:NoninvestmentGradeInvestmentsatLossLessthan5Million


Available
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value1087991524678114140
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue3.43.24.32.71.85.67.27.6

us-gaap:MortgageBackedSecurities, wrb:NoninvestmentGradeInvestmentsatLossLessthan5Million


Available
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value0.2760.541.6596.348140.297.177.656
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue0.00.00.10.30.50.00.50.4

us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue us-gaap:InvestmentSecondaryCategorization

wrb:NoninvestmentGradeInvestmentsatLossLessthan5Million


Available
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-30
Value14510512110611711219824526715612565221068914017619611429698479136170
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue4.64.35.85.54.58.012.513.30.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue us-gaap:FinancialInstrument

us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue

us-gaap:AssetBackedSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value258118031389144312902014755778101012501687
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CorporateDebtSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value972141461263653118863071991392231730
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue37.778.444.144.141.293.740.725.613.817.8102.5

us-gaap:DebtSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value44424195255226432236527919771532138418694895
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue172.1232.6183.8183.2173.3262.1261.8196.9137.0149.5290.1

us-gaap:ForeignGovernmentDebtSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value37630914312778114164133140192246
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue14.617.110.38.86.15.721.817.113.915.414.6

us-gaap:MortgageBackedSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value266322212116556093011592336334
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue10.317.915.38.14.330.339.920.52.32.919.8

us-gaap:USStatesAndPoliticalSubdivisions


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value2052881472042376403652066470701
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue8.016.010.614.218.431.848.426.56.45.641.6

us-gaap:USTreasuryAndGovernment


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value385747115421383556.17597195
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue1.53.23.48.03.30.711.17.20.67.811.6

us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue us-gaap:FinancialInstrument

us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue

us-gaap:AssetBackedSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value606652656665653614774621572598342
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CorporateDebtSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value44113394049541211573281293954
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue7.317.46.16.07.68.815.725.357.4216.2278.5

us-gaap:DebtSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value71583774776482386213631370167234682965
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue117.9128.4113.8114.8126.1140.3176.1220.4292.3579.8865.1

us-gaap:ForeignGovernmentDebtSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value11206.2185.7063824107103737080
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue2.03.10.90.95.94.013.816.712.911.823.3

us-gaap:MortgageBackedSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value293023285786180261334734712
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue4.94.73.64.38.814.123.342.058.5122.7207.8

us-gaap:USStatesAndPoliticalSubdivisions


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value222020242474127159270658744
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue3.73.13.13.63.812.216.425.747.3110.0217.3

us-gaap:USTreasuryAndGovernment


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value0.5240.4620.0170.0180.027.145536592113130
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue0.10.10.00.00.01.26.910.616.219.038.2

us-gaap:AvailableForSaleSecuritiesDebtSecurities

us-gaap:AvailableForSaleSecuritiesDebtSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value155791532714086138201320313587141021400713654135621352813493131391326313471137941343413334131021352812866126481234812267122941255012603122961198611885115151151011533115621184111789117101143811196111151116311093
Percentage of AvailableForSaleSecuritiesDebtSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtSecurities us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:AssetBackedSecurities, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value431739443194330630982938279027482701263024382549235421012111238821912027190722681916184417042005
Percentage of AvailableForSaleSecuritiesDebtSecurities27.725.722.723.923.521.619.819.619.819.418.018.917.915.815.717.316.315.214.616.814.914.613.815.9

us-gaap:CorporateDebtSecurities, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value5340521846704239377239784156413640363973411140653978411043894320427142444068391437393568347451585143521051795017458743994159385438093287
Percentage of AvailableForSaleSecuritiesDebtSecurities34.334.033.230.728.629.329.529.529.629.330.430.130.331.032.631.331.831.831.128.929.128.228.142.041.841.541.140.838.337.036.133.533.027.8

us-gaap:CorporateDebtSecurities, us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring


Available
Period End2020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value1.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.1540.1540.1541.932024373842465059
Percentage of AvailableForSaleSecuritiesDebtSecurities0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.20.20.30.30.40.40.40.5

us-gaap:ForeignGovernmentDebtSecurities, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value10681029975869871727847779815811808825801873848940892901902965898897837884967938941962968911879117311211111
Percentage of AvailableForSaleSecuritiesDebtSecurities6.96.76.96.36.65.46.05.66.06.06.06.16.16.66.36.86.66.86.97.17.07.16.87.27.97.57.57.88.17.77.610.29.79.4

us-gaap:MortgageBackedSecurities, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value923107610201082116114551625171015751580159415481458138612991320119112111189126311351155119911271169119812951298130613481329149315591715
Percentage of AvailableForSaleSecuritiesDebtSecurities5.97.07.27.88.810.711.512.211.511.711.811.511.110.59.69.68.99.19.19.38.89.19.79.29.59.510.310.610.911.311.513.013.514.5

us-gaap:USStatesAndPoliticalSubdivisions, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value3426350236203625360437483895381637473826387240174064431144454413444244614519456146164584446044234298444843624180422042574218411841474768
Percentage of AvailableForSaleSecuritiesDebtSecurities22.022.925.726.227.327.627.627.227.428.228.629.830.932.533.032.033.133.534.533.735.936.236.136.135.035.434.634.035.235.836.635.836.040.3

us-gaap:USTreasuryAndGovernment, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-31
Value502555603697693739786816777738702487481479377411443486513554560597670672715803
Percentage of AvailableForSaleSecuritiesDebtSecurities3.23.64.35.05.35.45.65.85.75.45.23.63.73.62.83.03.33.63.94.14.44.75.45.55.86.4

us-gaap:AvailableForSaleSecuritiesDebtSecurities us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency

us-gaap:AssetBackedSecurities, us-gaap:FairValueMeasurementsRecurring


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value431739443194330630982938279027482701263024382549235421012111238821922028190722681916184417052025
Percentage of AvailableForSaleSecuritiesDebtSecurities27.725.722.723.923.521.619.819.619.819.418.018.917.915.815.717.316.315.214.616.814.914.613.816.1

us-gaap:CorporateDebtSecurities, us-gaap:FairValueMeasurementsRecurring


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-312013-12-31
Value53405218467142393772397841564136403639734111406539784110438943204271424440683914373935683475515852004202
Percentage of AvailableForSaleSecuritiesDebtSecurities34.334.033.230.728.629.329.529.529.629.330.430.130.331.032.631.331.831.831.128.929.128.228.142.041.336.5

us-gaap:ForeignGovernmentDebtSecurities, us-gaap:FairValueMeasurementsRecurring


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-312013-12-31
Value10681029975869871727847779815811808825801873848940892901902965898897837884941879
Percentage of AvailableForSaleSecuritiesDebtSecurities6.96.76.96.36.65.46.05.66.06.06.06.16.16.66.36.86.66.86.97.17.07.16.87.27.57.6

us-gaap:MortgageBackedSecurities, us-gaap:FairValueMeasurementsRecurring


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-312013-12-31
Value9231076102010821161145516251710157515801594154814581386129913201191121111891263113511551199112712951329
Percentage of AvailableForSaleSecuritiesDebtSecurities5.97.07.27.88.810.711.512.211.511.711.811.511.110.59.69.68.99.19.19.38.89.19.79.210.311.5

us-gaap:USStatesAndPoliticalSubdivisions, us-gaap:FairValueMeasurementsRecurring


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-312013-12-31
Value34263502362036253604374838953816374738263872401740644311444544134442446145194561461645844460442343624218
Percentage of AvailableForSaleSecuritiesDebtSecurities22.022.925.726.227.327.627.627.227.428.228.629.830.932.533.032.033.133.534.533.735.936.236.136.134.636.6

us-gaap:USTreasuryAndGovernment, us-gaap:FairValueMeasurementsRecurring


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value502555603697693739786816777738702487481479377411443486513554560597670672803
Percentage of AvailableForSaleSecuritiesDebtSecurities3.23.64.35.05.35.45.65.85.75.45.23.63.73.62.83.03.33.63.94.14.44.75.45.56.4

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

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value15579153271408513820132031358714102140071365413562135281349313139132631347113794134341333313101135281286612648123471226712294125491258312272119491184711472114641148211781
Percentage of AvailableForSaleSecuritiesDebtSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.099.899.899.799.799.699.699.699.5

us-gaap:FairValueInputsLevel3, us-gaap:FairValueMeasurementsRecurring


Available
Period End2020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value1.00.00.00.00.00.0250.0250.0990.1010.1010.1630.1720.1740.1730.1790.1830.1850.1880.1970.3530.1540.1541.932024373842465059
Percentage of AvailableForSaleSecuritiesDebtSecurities0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.20.20.30.30.40.40.40.5

us-gaap:AvailableForSaleSecuritiesDebtSecurities us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-312013-12-31
Value1557915327140861382013203135871410214007136541356213528134931313913263134711379413434133341310213528128661264812348122671260311515
Percentage of AvailableForSaleSecuritiesDebtSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtSecurities us-gaap:FinancialInstrument

srt:IndustrialProperty


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value31063060256423261999215123292365223021302257
Percentage of AvailableForSaleSecuritiesDebtSecurities19.920.018.216.815.115.816.516.916.315.716.7

us-gaap:AssetBackedSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value43173944319433063098293827902748270126302438
Percentage of AvailableForSaleSecuritiesDebtSecurities27.725.722.723.923.521.619.819.619.819.418.0

us-gaap:CommercialMortgageBackedSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value143179187206217275309363309352342
Percentage of AvailableForSaleSecuritiesDebtSecurities0.91.21.31.51.62.02.22.62.32.62.5

us-gaap:CorporateDebtSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value53405218467142393772397841564136403639734111
Percentage of AvailableForSaleSecuritiesDebtSecurities34.334.033.230.728.629.329.529.529.629.330.4

us-gaap:Corporation


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value165172214232232258261250244256274
Percentage of AvailableForSaleSecuritiesDebtSecurities1.11.11.51.71.81.91.91.81.81.92.0

us-gaap:DebtSecurities


Available
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value22862234232824032438238324332406
Percentage of AvailableForSaleSecuritiesDebtSecurities16.516.917.117.017.417.517.917.8

us-gaap:DomesticCorporateDebtSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value16331564157515241431146714811427145314781463
Percentage of AvailableForSaleSecuritiesDebtSecurities10.510.211.211.010.810.810.510.210.610.910.8

us-gaap:ForeignGovernmentDebtSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value10681029975869871727847779815811808
Percentage of AvailableForSaleSecuritiesDebtSecurities6.96.76.96.36.65.46.05.66.06.06.0

us-gaap:MortgageBackedSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value9231076102010821161145516251710157515801594
Percentage of AvailableForSaleSecuritiesDebtSecurities5.97.07.27.88.810.711.512.211.511.711.8

us-gaap:OtherAggregatedInvestments


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value1771531103219245.44921284360
Percentage of AvailableForSaleSecuritiesDebtSecurities1.11.00.80.20.10.20.00.20.20.30.4

us-gaap:PublicUtilityBonds


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value423439421355322334340322324321329
Percentage of AvailableForSaleSecuritiesDebtSecurities2.72.93.02.62.42.52.42.32.42.42.4

us-gaap:ResidentialMortgageBackedSecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value780896832876944117913161347126612281251
Percentage of AvailableForSaleSecuritiesDebtSecurities5.05.95.96.37.28.79.39.69.39.19.3

us-gaap:RevenueSubjectToRefund


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value242248271279320329384300318355424
Percentage of AvailableForSaleSecuritiesDebtSecurities1.61.61.92.02.42.42.72.12.32.63.1

us-gaap:SovereignDebtLocalGovernmentUnspecified


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value452467450438436446464461458430420
Percentage of AvailableForSaleSecuritiesDebtSecurities2.93.03.23.23.33.33.33.33.43.23.1

us-gaap:SovereignDebtStateGovernmentUnspecified


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value407426450387380385381365342350346
Percentage of AvailableForSaleSecuritiesDebtSecurities2.62.83.22.82.92.82.72.62.52.62.6

us-gaap:USStatesAndPoliticalSubdivisions


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value34263502362036253604374838953816374738263872
Percentage of AvailableForSaleSecuritiesDebtSecurities22.022.925.726.227.327.627.627.227.428.228.6

us-gaap:USTreasuryAndGovernment


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value502555603697693739786816777738702
Percentage of AvailableForSaleSecuritiesDebtSecurities3.23.64.35.05.35.45.65.85.75.45.2

wrb:SpecialRevenue


Available
Period End2021-06-302021-03-312020-12-312019-12-312018-12-31
Value21572187223324032406
Percentage of AvailableForSaleSecuritiesDebtSecurities13.814.315.917.017.8

us-gaap:AvailableForSaleSecuritiesEquitySecurities

us-gaap:AvailableForSaleSecuritiesEquitySecurities


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value642621625435362356480443416341279325472496576614612611669158286141150177153174170222257322283338434399376425561489443438511510561401
Percentage of AvailableForSaleSecuritiesEquitySecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesEquitySecurities us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap