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Segment Reporting (Schedule Of Significant Components Of The Company's Revenues And Expenses) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Segment Reporting Information [Line Items] |  |
Gross premiums written | $ 643,578 us-gaap_PremiumsWrittenGross | $ 705,260 us-gaap_PremiumsWrittenGross
Net premiums written | 404,035 us-gaap_PremiumsWrittenNet | 450,347 us-gaap_PremiumsWrittenNet
Net premiums earned | 296,760 us-gaap_PremiumsEarnedNet | 286,534 us-gaap_PremiumsEarnedNet
Net claims and claim expenses incurred | 76,853 us-gaap_PolicyholderBenefitsAndClaimsIncurredNet | 58,915 us-gaap_PolicyholderBenefitsAndClaimsIncurredNet
Acquisition expenses | 43,401 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense | 33,700 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense
Operational expenses | 45,621 us-gaap_OperatingExpenses | 42,624 us-gaap_OperatingExpenses
Underwriting income (loss) | 130,885 rnr_UnderwritingIncomeLossNet | 151,295 rnr_UnderwritingIncomeLossNet
Net investment income | 39,707 us-gaap_NetInvestmentIncome | 38,948 us-gaap_NetInvestmentIncome
Net foreign exchange losses | (3,130)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax | (1,061)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Equity in earnings of other ventures | 5,295 us-gaap_IncomeLossFromEquityMethodInvestments | 4,199 us-gaap_IncomeLossFromEquityMethodInvestments
Other income | 1,539 us-gaap_OtherOperatingIncomeExpenseNet | 62 us-gaap_OtherOperatingIncomeExpenseNet
Net realized and unrealized gains on investments | 41,749 us-gaap_GainLossOnInvestments | 14,927 us-gaap_GainLossOnInvestments
Corporate expenses | (45,598)us-gaap_GeneralAndAdministrativeExpense | (4,545)us-gaap_GeneralAndAdministrativeExpense
Interest expense | (5,251)us-gaap_InterestExpense | (4,293)us-gaap_InterestExpense
Income before taxes | 165,196 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 199,532 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income tax benefit (expense) | 47,904 us-gaap_IncomeTaxExpenseBenefit | (166)us-gaap_IncomeTaxExpenseBenefit
Net income attributable to noncontrolling interests | (39,662)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (42,768)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Dividends on preference shares | (5,595)us-gaap_DividendsPreferredStock | (5,595)us-gaap_DividendsPreferredStock
Net income available to RenaissanceRe common shareholders | 167,843 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 151,003 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Net claims and claim expenses incurred – current accident year | 98,998 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense | 75,608 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense
Net claims and claim expenses incurred – prior accident years | (22,145)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense | (16,693)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense
Net claims and claim expenses incurred – total | 76,853 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1 | 58,915 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1
Net claims and claim expense ratio – current accident year | 33.40%rnr_NetClaimsAndClaimsExpenseRatioCurrentYear | 26.40%rnr_NetClaimsAndClaimsExpenseRatioCurrentYear
Net claims and claim expense ratio – prior accident years | (7.50%)rnr_NetClaimsAndClaimExpenseRatioPriorYears | (5.80%)rnr_NetClaimsAndClaimExpenseRatioPriorYears
Net claims and claim expense ratio – calendar year | 25.90%us-gaap_LossRatio | 20.60%us-gaap_LossRatio
Underwriting expense ratio | 30.00%us-gaap_UnderwritingExpenseRatio | 26.60%us-gaap_UnderwritingExpenseRatio
Combined ratio | 55.90%us-gaap_CombinedRatio | 47.20%us-gaap_CombinedRatio
Intersegment Eliminations |  |
Segment Reporting Information [Line Items] |  |
Gross premiums written | (100)us-gaap_PremiumsWrittenGross / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember |
Catastrophe Reinsurance |  |
Segment Reporting Information [Line Items] |  |
Gross premiums written | 389,247 us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember | 467,711 us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Net premiums written | 222,640 us-gaap_PremiumsWrittenNet / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember | 259,489 us-gaap_PremiumsWrittenNet / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Net premiums earned | 143,767 us-gaap_PremiumsEarnedNet / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember | 164,584 us-gaap_PremiumsEarnedNet / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Net claims and claim expenses incurred | 7,594 us-gaap_PolicyholderBenefitsAndClaimsIncurredNet / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember | 6,455 us-gaap_PolicyholderBenefitsAndClaimsIncurredNet / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Acquisition expenses | 7,654 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember | 7,126 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Operational expenses | 20,363 us-gaap_OperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember | 20,419 us-gaap_OperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Underwriting income (loss) | 108,156 rnr_UnderwritingIncomeLossNet / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember | 130,584 rnr_UnderwritingIncomeLossNet / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Net claims and claim expenses incurred – current accident year | 24,124 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember | 12,529 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Net claims and claim expenses incurred – prior accident years | (16,530)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember | (6,074)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Net claims and claim expenses incurred – total | 7,594 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1 / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember | 6,455 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1 / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Net claims and claim expense ratio – current accident year | 16.80%rnr_NetClaimsAndClaimsExpenseRatioCurrentYear / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember | 7.60%rnr_NetClaimsAndClaimsExpenseRatioCurrentYear / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Net claims and claim expense ratio – prior accident years | (11.50%)rnr_NetClaimsAndClaimExpenseRatioPriorYears / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember | (3.70%)rnr_NetClaimsAndClaimExpenseRatioPriorYears / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Net claims and claim expense ratio – calendar year | 5.30%us-gaap_LossRatio / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember | 3.90%us-gaap_LossRatio / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Underwriting expense ratio | 19.50%us-gaap_UnderwritingExpenseRatio / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember | 16.80%us-gaap_UnderwritingExpenseRatio / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Combined ratio | 24.80%us-gaap_CombinedRatio / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember | 20.70%us-gaap_CombinedRatio / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Specialty Reinsurance |  |
Segment Reporting Information [Line Items] |  |
Gross premiums written | 124,291 us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember | 154,290 us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Net premiums written | 103,915 us-gaap_PremiumsWrittenNet / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember | 125,489 us-gaap_PremiumsWrittenNet / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Net premiums earned | 94,876 us-gaap_PremiumsEarnedNet / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember | 69,630 us-gaap_PremiumsEarnedNet / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Net claims and claim expenses incurred | 39,588 us-gaap_PolicyholderBenefitsAndClaimsIncurredNet / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember | 26,081 us-gaap_PolicyholderBenefitsAndClaimsIncurredNet / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Acquisition expenses | 20,689 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember | 16,547 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Operational expenses | 13,290 us-gaap_OperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember | 10,106 us-gaap_OperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Underwriting income (loss) | 21,309 rnr_UnderwritingIncomeLossNet / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember | 16,896 rnr_UnderwritingIncomeLossNet / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Net claims and claim expenses incurred – current accident year | 49,264 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember | 41,922 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Net claims and claim expenses incurred – prior accident years | (9,676)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember | (15,841)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Net claims and claim expenses incurred – total | 39,588 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1 / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember | 26,081 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1 / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Net claims and claim expense ratio – current accident year | 51.90%rnr_NetClaimsAndClaimsExpenseRatioCurrentYear / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember | 60.20%rnr_NetClaimsAndClaimsExpenseRatioCurrentYear / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Net claims and claim expense ratio – prior accident years | (10.20%)rnr_NetClaimsAndClaimExpenseRatioPriorYears / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember | (22.70%)rnr_NetClaimsAndClaimExpenseRatioPriorYears / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Net claims and claim expense ratio – calendar year | 41.70%us-gaap_LossRatio / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember | 37.50%us-gaap_LossRatio / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Underwriting expense ratio | 35.80%us-gaap_UnderwritingExpenseRatio / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember | 38.20%us-gaap_UnderwritingExpenseRatio / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Combined ratio | 77.50%us-gaap_CombinedRatio / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember | 75.70%us-gaap_CombinedRatio / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Lloyd's |  |
Segment Reporting Information [Line Items] |  |
Gross premiums written | 130,130 us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember | 83,259 us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Net premiums written | 77,569 us-gaap_PremiumsWrittenNet / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember | 65,369 us-gaap_PremiumsWrittenNet / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Net premiums earned | 58,206 us-gaap_PremiumsEarnedNet / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember | 52,297 us-gaap_PremiumsEarnedNet / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Net claims and claim expenses incurred | 29,843 us-gaap_PolicyholderBenefitsAndClaimsIncurredNet / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember | 26,281 us-gaap_PolicyholderBenefitsAndClaimsIncurredNet / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Acquisition expenses | 14,693 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember | 10,567 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Operational expenses | 11,940 us-gaap_OperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember | 12,033 us-gaap_OperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Underwriting income (loss) | 1,730 rnr_UnderwritingIncomeLossNet / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember | 3,416 rnr_UnderwritingIncomeLossNet / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Net claims and claim expenses incurred – current accident year | 25,610 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember | 21,157 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Net claims and claim expenses incurred – prior accident years | 4,233 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember | 5,124 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Net claims and claim expenses incurred – total | 29,843 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1 / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember | 26,281 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1 / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Net claims and claim expense ratio – current accident year | 44.00%rnr_NetClaimsAndClaimsExpenseRatioCurrentYear / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember | 40.50%rnr_NetClaimsAndClaimsExpenseRatioCurrentYear / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Net claims and claim expense ratio – prior accident years | 7.30%rnr_NetClaimsAndClaimExpenseRatioPriorYears / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember | 9.80%rnr_NetClaimsAndClaimExpenseRatioPriorYears / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Net claims and claim expense ratio – calendar year | 51.30%us-gaap_LossRatio / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember | 50.30%us-gaap_LossRatio / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Underwriting expense ratio | 45.70%us-gaap_UnderwritingExpenseRatio / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember | 43.20%us-gaap_UnderwritingExpenseRatio / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Combined ratio | 97.00%us-gaap_CombinedRatio / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember | 93.50%us-gaap_CombinedRatio / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Other |  |
Segment Reporting Information [Line Items] |  |
Gross premiums written | (90)us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 0 us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Net premiums written | (89)us-gaap_PremiumsWrittenNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 0 us-gaap_PremiumsWrittenNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Net premiums earned | (89)us-gaap_PremiumsEarnedNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 23 us-gaap_PremiumsEarnedNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Net claims and claim expenses incurred | (172)us-gaap_PolicyholderBenefitsAndClaimsIncurredNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 98 us-gaap_PolicyholderBenefitsAndClaimsIncurredNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Acquisition expenses | 365 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (540)us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Operational expenses | 28 us-gaap_OperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 66 us-gaap_OperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Underwriting income (loss) | (310)rnr_UnderwritingIncomeLossNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 399 rnr_UnderwritingIncomeLossNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Net investment income | 39,707 us-gaap_NetInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 38,948 us-gaap_NetInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Net foreign exchange losses | (3,130)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (1,061)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Equity in earnings of other ventures | 5,295 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 4,199 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Other income | 1,539 us-gaap_OtherOperatingIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 62 us-gaap_OtherOperatingIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Net realized and unrealized gains on investments | 41,749 us-gaap_GainLossOnInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 14,927 us-gaap_GainLossOnInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Corporate expenses | (45,598)us-gaap_GeneralAndAdministrativeExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (4,545)us-gaap_GeneralAndAdministrativeExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Interest expense | (5,251)us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (4,293)us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Income tax benefit (expense) | 47,904 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (166)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Net income attributable to noncontrolling interests | (39,662)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (42,768)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Dividends on preference shares | (5,595)us-gaap_DividendsPreferredStock / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (5,595)us-gaap_DividendsPreferredStock / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Net claims and claim expenses incurred – current accident year | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Net claims and claim expenses incurred – prior accident years | (172)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 98 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Net claims and claim expenses incurred – total | $ (172)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1 / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | $ 98 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1 / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Net claims and claim expense ratio – current accident year | 0.00%rnr_NetClaimsAndClaimsExpenseRatioCurrentYear / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 0.00%rnr_NetClaimsAndClaimsExpenseRatioCurrentYear / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Net claims and claim expense ratio – prior accident years | 193.30%rnr_NetClaimsAndClaimExpenseRatioPriorYears / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 426.10%rnr_NetClaimsAndClaimExpenseRatioPriorYears / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Net claims and claim expense ratio – calendar year | 193.30%us-gaap_LossRatio / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 426.10%us-gaap_LossRatio / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Underwriting expense ratio | (441.60%)us-gaap_UnderwritingExpenseRatio / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (2060.90%)us-gaap_UnderwritingExpenseRatio / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Combined ratio | (248.30%)us-gaap_CombinedRatio / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (1634.80%)us-gaap_CombinedRatio / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember

X
- Definition Net claims and claim expense ratio - prior accident years is derived by dividing net claims and claim expenses - prior accident years by net premiums earned. + References No definition available. + Details
Name: | rnr_NetClaimsAndClaimExpenseRatioPriorYears
Namespace Prefix: | rnr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Net claims and claim expense ratio - current accident year is derived by dividing net claims and claim expense - current accident year by net premiums earned. + References No definition available. + Details
Name: | rnr_NetClaimsAndClaimsExpenseRatioCurrentYear
Namespace Prefix: | rnr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Net premiums earned less net claims and claim expenses incurred, acquisition expenses and operational expenses directly related to underwriting activities. + References No definition available. + Details
Name: | rnr_UnderwritingIncomeLossNet
Namespace Prefix: | rnr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Ratio of non-life losses and loss expenses, non-life acquisition expenses and non-life general and administrative expenses, to non-life net premiums earned. + References No definition available. + Details
Name: | us-gaap_CombinedRatio
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
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