3.20.2 html 732 441 1 true 118 0 false 9 false false R1.htm 0001000 - Document - Document and Entity Information Sheet http://www.watfordre.com/role/DocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 1002000 - Statement - Consolidated Balance Sheets Sheet http://www.watfordre.com/role/ConsolidatedBalanceSheets Consolidated Balance Sheets Statements 2 false false R3.htm 1002001 - Statement - Consolidated Balance Sheets (Parenthetical) Sheet http://www.watfordre.com/role/ConsolidatedBalanceSheetsParenthetical Consolidated Balance Sheets (Parenthetical) Statements 3 false false R4.htm 1003000 - Statement - Unaudited Consolidated Statements of Income (Loss) Sheet http://www.watfordre.com/role/UnauditedConsolidatedStatementsOfIncomeLoss Unaudited Consolidated Statements of Income (Loss) Statements 4 false false R5.htm 1004000 - Statement - Unaudited Consolidated Statements of Comprehensive Income (Loss) Statement Sheet http://www.watfordre.com/role/UnauditedConsolidatedStatementsOfComprehensiveIncomeLossStatement Unaudited Consolidated Statements of Comprehensive Income (Loss) Statement Statements 5 false false R6.htm 1005000 - Statement - Unaudited Consolidated Statements of Changes in Shareholders' Equity Statement Sheet http://www.watfordre.com/role/UnauditedConsolidatedStatementsOfChangesInShareholdersEquityStatement Unaudited Consolidated Statements of Changes in Shareholders' Equity Statement Statements 6 false false R7.htm 1006000 - Statement - Unaudited Consolidated Statements of Cash Flows Sheet http://www.watfordre.com/role/UnauditedConsolidatedStatementsOfCashFlows Unaudited Consolidated Statements of Cash Flows Statements 7 false false R8.htm 2101100 - Disclosure - Organization Sheet http://www.watfordre.com/role/Organization Organization Notes 8 false false R9.htm 2104100 - Disclosure - Significant accounting policies Sheet http://www.watfordre.com/role/SignificantAccountingPolicies Significant accounting policies Notes 9 false false R10.htm 2107100 - Disclosure - Segment information Sheet http://www.watfordre.com/role/SegmentInformation Segment information Notes 10 false false R11.htm 2110100 - Disclosure - Reinsurance Sheet http://www.watfordre.com/role/Reinsurance Reinsurance Notes 11 false false R12.htm 2113100 - Disclosure - Reserve for losses and loss adjustment expenses Sheet http://www.watfordre.com/role/ReserveForLossesAndLossAdjustmentExpenses Reserve for losses and loss adjustment expenses Notes 12 false false R13.htm 2116100 - Disclosure - Allowance for expected credit losses Sheet http://www.watfordre.com/role/AllowanceForExpectedCreditLosses Allowance for expected credit losses Notes 13 false false R14.htm 2119100 - Disclosure - Investment information Sheet http://www.watfordre.com/role/InvestmentInformation Investment information Notes 14 false false R15.htm 2122100 - Disclosure - Fair value Sheet http://www.watfordre.com/role/FairValue Fair value Notes 15 false false R16.htm 2125100 - Disclosure - Derivatives Sheet http://www.watfordre.com/role/Derivatives Derivatives Notes 16 false false R17.htm 2128100 - Disclosure - Earnings per common share Sheet http://www.watfordre.com/role/EarningsPerCommonShare Earnings per common share Notes 17 false false R18.htm 2131100 - Disclosure - Income taxes Sheet http://www.watfordre.com/role/IncomeTaxes Income taxes Notes 18 false false R19.htm 2134100 - Disclosure - Transactions with related parties Sheet http://www.watfordre.com/role/TransactionsWithRelatedParties Transactions with related parties Notes 19 false false R20.htm 2137100 - Disclosure - Commitments and contingencies Sheet http://www.watfordre.com/role/CommitmentsAndContingencies Commitments and contingencies Notes 20 false false R21.htm 2140100 - Disclosure - Leases Sheet http://www.watfordre.com/role/Leases Leases Notes 21 false false R22.htm 2141100 - Disclosure - Senior notes Notes http://www.watfordre.com/role/SeniorNotes Senior notes Notes 22 false false R23.htm 2142100 - Disclosure - Contingently redeemable preference shares Sheet http://www.watfordre.com/role/ContingentlyRedeemablePreferenceShares Contingently redeemable preference shares Notes 23 false false R24.htm 2143100 - Disclosure - Share Transactions Sheet http://www.watfordre.com/role/ShareTransactions Share Transactions Notes 24 false false R25.htm 2144100 - Disclosure - Legal proceedings Sheet http://www.watfordre.com/role/LegalProceedings Legal proceedings Notes 25 false false R26.htm 2204201 - Disclosure - Significant accounting policies (Policies) Sheet http://www.watfordre.com/role/SignificantAccountingPoliciesPolicies Significant accounting policies (Policies) Policies 26 false false R27.htm 2307301 - Disclosure - Segment information (Tables) Sheet http://www.watfordre.com/role/SegmentInformationTables Segment information (Tables) Tables http://www.watfordre.com/role/SegmentInformation 27 false false R28.htm 2310301 - Disclosure - Reinsurance (Tables) Sheet http://www.watfordre.com/role/ReinsuranceTables Reinsurance (Tables) Tables http://www.watfordre.com/role/Reinsurance 28 false false R29.htm 2313301 - Disclosure - Reserve for losses and loss adjustment expenses (Tables) Sheet http://www.watfordre.com/role/ReserveForLossesAndLossAdjustmentExpensesTables Reserve for losses and loss adjustment expenses (Tables) Tables http://www.watfordre.com/role/ReserveForLossesAndLossAdjustmentExpenses 29 false false R30.htm 2316301 - Disclosure - Allowance for expected credit losses (Tables) Sheet http://www.watfordre.com/role/AllowanceForExpectedCreditLossesTables Allowance for expected credit losses (Tables) Tables http://www.watfordre.com/role/AllowanceForExpectedCreditLosses 30 false false R31.htm 2319301 - Disclosure - Investment information (Tables) Sheet http://www.watfordre.com/role/InvestmentInformationTables Investment information (Tables) Tables http://www.watfordre.com/role/InvestmentInformation 31 false false R32.htm 2322301 - Disclosure - Fair value (Tables) Sheet http://www.watfordre.com/role/FairValueTables Fair value (Tables) Tables http://www.watfordre.com/role/FairValue 32 false false R33.htm 2325301 - Disclosure - Derivatives (Tables) Sheet http://www.watfordre.com/role/DerivativesTables Derivatives (Tables) Tables http://www.watfordre.com/role/Derivatives 33 false false R34.htm 2328301 - Disclosure - Earnings per common share (Tables) Sheet http://www.watfordre.com/role/EarningsPerCommonShareTables Earnings per common share (Tables) Tables http://www.watfordre.com/role/EarningsPerCommonShare 34 false false R35.htm 2334301 - Disclosure - Transactions with related parties (Tables) Sheet http://www.watfordre.com/role/TransactionsWithRelatedPartiesTables Transactions with related parties (Tables) Tables http://www.watfordre.com/role/TransactionsWithRelatedParties 35 false false R36.htm 2340301 - Disclosure - Leases (Tables) Sheet http://www.watfordre.com/role/LeasesTables Leases (Tables) Tables http://www.watfordre.com/role/Leases 36 false false R37.htm 2342301 - Disclosure - Contingently redeemable preference shares (Tables) Sheet http://www.watfordre.com/role/ContingentlyRedeemablePreferenceSharesTables Contingently redeemable preference shares (Tables) Tables http://www.watfordre.com/role/ContingentlyRedeemablePreferenceShares 37 false false R38.htm 2401401 - Disclosure - Organization (Details) Sheet http://www.watfordre.com/role/OrganizationDetails Organization (Details) Details http://www.watfordre.com/role/Organization 38 false false R39.htm 2404402 - Disclosure - Significant accounting policies (Details) Sheet http://www.watfordre.com/role/SignificantAccountingPoliciesDetails Significant accounting policies (Details) Details http://www.watfordre.com/role/SignificantAccountingPoliciesPolicies 39 false false R40.htm 2407402 - Disclosure - Segment information (Details) Sheet http://www.watfordre.com/role/SegmentInformationDetails Segment information (Details) Details http://www.watfordre.com/role/SegmentInformationTables 40 false false R41.htm 2410402 - Disclosure - Reinsurance - Effects of reinsurance (Details) Sheet http://www.watfordre.com/role/ReinsuranceEffectsOfReinsuranceDetails Reinsurance - Effects of reinsurance (Details) Details 41 false false R42.htm 2410403 - Disclosure - Reinsurance - Ceded credit risk (Details) Sheet http://www.watfordre.com/role/ReinsuranceCededCreditRiskDetails Reinsurance - Ceded credit risk (Details) Details 42 false false R43.htm 2413402 - Disclosure - Reserve for losses and loss adjustment expenses - Reconciliation of beginning and ending balances of loss reserves (Details) Sheet http://www.watfordre.com/role/ReserveForLossesAndLossAdjustmentExpensesReconciliationOfBeginningAndEndingBalancesOfLossReservesDetails Reserve for losses and loss adjustment expenses - Reconciliation of beginning and ending balances of loss reserves (Details) Details 43 false false R44.htm 2413403 - Disclosure - Reserve for losses and loss adjustment expenses - Prior year development (Details) Sheet http://www.watfordre.com/role/ReserveForLossesAndLossAdjustmentExpensesPriorYearDevelopmentDetails Reserve for losses and loss adjustment expenses - Prior year development (Details) Details 44 false false R45.htm 2416402 - Disclosure - Allowance for expected credit losses - Premiums receivable (Details) Sheet http://www.watfordre.com/role/AllowanceForExpectedCreditLossesPremiumsReceivableDetails Allowance for expected credit losses - Premiums receivable (Details) Details 45 false false R46.htm 2416403 - Disclosure - Allowance for expected credit losses - Reinsurance recoverable (Details) Sheet http://www.watfordre.com/role/AllowanceForExpectedCreditLossesReinsuranceRecoverableDetails Allowance for expected credit losses - Reinsurance recoverable (Details) Details 46 false false R47.htm 2419402 - Disclosure - Investment information - Summary of available for sale securities (Details) Sheet http://www.watfordre.com/role/InvestmentInformationSummaryOfAvailableForSaleSecuritiesDetails Investment information - Summary of available for sale securities (Details) Details 47 false false R48.htm 2419403 - Disclosure - Investment information - Aging of available for sale securities in an unrealized loss position (Details) Sheet http://www.watfordre.com/role/InvestmentInformationAgingOfAvailableForSaleSecuritiesInUnrealizedLossPositionDetails Investment information - Aging of available for sale securities in an unrealized loss position (Details) Details 48 false false R49.htm 2419404 - Disclosure - Investment information - Maturity profile of available for sale securities (Details) Sheet http://www.watfordre.com/role/InvestmentInformationMaturityProfileOfAvailableForSaleSecuritiesDetails Investment information - Maturity profile of available for sale securities (Details) Details 49 false false R50.htm 2419405 - Disclosure - Investment information - Fair value option (Details) Sheet http://www.watfordre.com/role/InvestmentInformationFairValueOptionDetails Investment information - Fair value option (Details) Details 50 false false R51.htm 2419406 - Disclosure - Investment information - Maturity profile of investments other than available for sale (Details) Sheet http://www.watfordre.com/role/InvestmentInformationMaturityProfileOfInvestmentsOtherThanAvailableForSaleDetails Investment information - Maturity profile of investments other than available for sale (Details) Details 51 false false R52.htm 2419407 - Disclosure - Investment information - Credit quality of investments (Details) Sheet http://www.watfordre.com/role/InvestmentInformationCreditQualityOfInvestmentsDetails Investment information - Credit quality of investments (Details) Details 52 false false R53.htm 2419408 - Disclosure - Investment information - Net investment income (Details) Sheet http://www.watfordre.com/role/InvestmentInformationNetInvestmentIncomeDetails Investment information - Net investment income (Details) Details 53 false false R54.htm 2419409 - Disclosure - Investment information - Narrative (Details) Sheet http://www.watfordre.com/role/InvestmentInformationNarrativeDetails Investment information - Narrative (Details) Details 54 false false R55.htm 2422402 - Disclosure - Fair value - Fair value hierarchy (Details) Sheet http://www.watfordre.com/role/FairValueFairValueHierarchyDetails Fair value - Fair value hierarchy (Details) Details 55 false false R56.htm 2422403 - Disclosure - Fair value - Level 3 rollforward (Details) Sheet http://www.watfordre.com/role/FairValueLevel3RollforwardDetails Fair value - Level 3 rollforward (Details) Details 56 false false R57.htm 2422404 - Disclosure - Fair value - Narrative (Details) Sheet http://www.watfordre.com/role/FairValueNarrativeDetails Fair value - Narrative (Details) Details 57 false false R58.htm 2425402 - Disclosure - Derivatives - Fair values and notional amounts of derivatives (Details) Sheet http://www.watfordre.com/role/DerivativesFairValuesAndNotionalAmountsOfDerivativesDetails Derivatives - Fair values and notional amounts of derivatives (Details) Details 58 false false R59.htm 2425403 - Disclosure - Derivatives - Summary of realized and unrealized gains and losses on derivatives (Details) Sheet http://www.watfordre.com/role/DerivativesSummaryOfRealizedAndUnrealizedGainsAndLossesOnDerivativesDetails Derivatives - Summary of realized and unrealized gains and losses on derivatives (Details) Details 59 false false R60.htm 2425404 - Disclosure - Derivatives - Narrative (Details) Sheet http://www.watfordre.com/role/DerivativesNarrativeDetails Derivatives - Narrative (Details) Details 60 false false R61.htm 2428402 - Disclosure - Earnings per common share - Computation of basic and diluted earnings per common share (Details) Sheet http://www.watfordre.com/role/EarningsPerCommonShareComputationOfBasicAndDilutedEarningsPerCommonShareDetails Earnings per common share - Computation of basic and diluted earnings per common share (Details) Details 61 false false R62.htm 2428403 - Disclosure - Earnings per common share - Narrative (Details) Sheet http://www.watfordre.com/role/EarningsPerCommonShareNarrativeDetails Earnings per common share - Narrative (Details) Details 62 false false R63.htm 2431401 - Disclosure - Income taxes (Details) Sheet http://www.watfordre.com/role/IncomeTaxesDetails Income taxes (Details) Details http://www.watfordre.com/role/IncomeTaxes 63 false false R64.htm 2434402 - Disclosure - Transactions with related parties - Transactions with ACGL (Details) Sheet http://www.watfordre.com/role/TransactionsWithRelatedPartiesTransactionsWithAcglDetails Transactions with related parties - Transactions with ACGL (Details) Details 64 false false R65.htm 2434403 - Disclosure - Transactions with related parties - Transactions with other ACGL entities (Details) Sheet http://www.watfordre.com/role/TransactionsWithRelatedPartiesTransactionsWithOtherAcglEntitiesDetails Transactions with related parties - Transactions with other ACGL entities (Details) Details 65 false false R66.htm 2434404 - Disclosure - Transactions with related parties - Transactions with HPS (Details) Sheet http://www.watfordre.com/role/TransactionsWithRelatedPartiesTransactionsWithHpsDetails Transactions with related parties - Transactions with HPS (Details) Details 66 false false R67.htm 2434405 - Disclosure - Transactions with related parties - Transactions with Artex (Details) Sheet http://www.watfordre.com/role/TransactionsWithRelatedPartiesTransactionsWithArtexDetails Transactions with related parties - Transactions with Artex (Details) Details 67 false false R68.htm 2437401 - Disclosure - Commitments and contingencies - Concentrations of credit risk (Details) Sheet http://www.watfordre.com/role/CommitmentsAndContingenciesConcentrationsOfCreditRiskDetails Commitments and contingencies - Concentrations of credit risk (Details) Details 68 false false R69.htm 2437402 - Disclosure - Commitments and contingencies - Credit facilities (Details) Sheet http://www.watfordre.com/role/CommitmentsAndContingenciesCreditFacilitiesDetails Commitments and contingencies - Credit facilities (Details) Details 69 false false R70.htm 2437403 - Disclosure - Commitments and contingencies - Custodian facility (Details) Sheet http://www.watfordre.com/role/CommitmentsAndContingenciesCustodianFacilityDetails Commitments and contingencies - Custodian facility (Details) Details 70 false false R71.htm 2437404 - Disclosure - Commitments and contingencies - Investment commitments (Details) Sheet http://www.watfordre.com/role/CommitmentsAndContingenciesInvestmentCommitmentsDetails Commitments and contingencies - Investment commitments (Details) Details 71 false false R72.htm 2440402 - Disclosure - Leases - Additional information regarding real estate operating leases (Details) Sheet http://www.watfordre.com/role/LeasesAdditionalInformationRegardingRealEstateOperatingLeasesDetails Leases - Additional information regarding real estate operating leases (Details) Details 72 false false R73.htm 2440403 - Disclosure - Leases - Contractual maturity of lease liability (Details) Sheet http://www.watfordre.com/role/LeasesContractualMaturityOfLeaseLiabilityDetails Leases - Contractual maturity of lease liability (Details) Details 73 false false R74.htm 2441401 - Disclosure - Senior notes (Details) Notes http://www.watfordre.com/role/SeniorNotesDetails Senior notes (Details) Details http://www.watfordre.com/role/SeniorNotes 74 false false R75.htm 2442402 - Disclosure - Contingently redeemable preference shares - Reconciliation of beginning and ending balances of preference shares (Details) Sheet http://www.watfordre.com/role/ContingentlyRedeemablePreferenceSharesReconciliationOfBeginningAndEndingBalancesOfPreferenceSharesDetails Contingently redeemable preference shares - Reconciliation of beginning and ending balances of preference shares (Details) Details 75 false false R76.htm 2442403 - Disclosure - Contingently redeemable preference shares - Narrative (Details) Sheet http://www.watfordre.com/role/ContingentlyRedeemablePreferenceSharesNarrativeDetails Contingently redeemable preference shares - Narrative (Details) Details 76 false false R77.htm 2443401 - Disclosure - Share Transactions - Share-based compensation (Details) Sheet http://www.watfordre.com/role/ShareTransactionsShareBasedCompensationDetails Share Transactions - Share-based compensation (Details) Details 77 false false R78.htm 2443402 - Disclosure - Share Transactions - Share repurchase program (Details) Sheet http://www.watfordre.com/role/ShareTransactionsShareRepurchaseProgramDetails Share Transactions - Share repurchase program (Details) Details 78 false false All Reports Book All Reports wtre-20200630.xml wtre-20200630.xsd wtre-20200630_cal.xml wtre-20200630_def.xml wtre-20200630_lab.xml wtre-20200630_pre.xml http://xbrl.sec.gov/currency/2019-01-31 http://xbrl.sec.gov/country/2017-01-31 http://xbrl.sec.gov/dei/2019-01-31 http://fasb.org/us-gaap/2019-01-31 http://fasb.org/srt/2019-01-31 true true