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Condensed Consolidating Financial Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Statement of Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Condensed Financial Statements, Captions [Line Items] |  |
Net income | $ 213,100 us-gaap_ProfitLoss | $ 199,366 us-gaap_ProfitLoss
Change in net unrealized gains on investments | (74)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax | (168)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Comprehensive income | 213,026 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest | 199,198 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
Net income attributable to noncontrolling interests | (39,662)us-gaap_NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsRedeemable | (42,768)us-gaap_NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsRedeemable
Comprehensive income attributable to noncontrolling interests | (39,662)us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest | (42,768)us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
Comprehensive income attributable to RenaissanceRe | 173,364 us-gaap_ComprehensiveIncomeNetOfTax | 156,430 us-gaap_ComprehensiveIncomeNetOfTax
RenaissanceRe Holdings Ltd. (Parent Guarantor) |  |
Condensed Financial Statements, Captions [Line Items] |  |
Net income | 173,438 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 156,598 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Change in net unrealized gains on investments | 0 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Comprehensive income | 173,438 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 156,598 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net income attributable to noncontrolling interests | 0 us-gaap_NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsRedeemable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsRedeemable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Comprehensive income attributable to noncontrolling interests | 0 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Comprehensive income attributable to RenaissanceRe | 173,438 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 156,598 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Platinum Underwriters Holdings, Ltd. |  |
Condensed Financial Statements, Captions [Line Items] |  |
Net income | (19,560)us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |
Change in net unrealized gains on investments | 0 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |
Comprehensive income | (19,560)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |
Net income attributable to noncontrolling interests | 0 us-gaap_NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsRedeemable / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |
Comprehensive income attributable to noncontrolling interests | 0 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |
Comprehensive income attributable to RenaissanceRe | (19,560)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |
RenRe North America Holdings Inc. |  |
Condensed Financial Statements, Captions [Line Items] |  |
Net income | 43,536 us-gaap_ProfitLoss / dei_LegalEntityAxis = rnr_SubsidiaryIssuerOneMember | (3,190)us-gaap_ProfitLoss / dei_LegalEntityAxis = rnr_SubsidiaryIssuerOneMember
Change in net unrealized gains on investments | 0 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = rnr_SubsidiaryIssuerOneMember | 0 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = rnr_SubsidiaryIssuerOneMember
Comprehensive income | 43,536 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = rnr_SubsidiaryIssuerOneMember | (3,190)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = rnr_SubsidiaryIssuerOneMember
Net income attributable to noncontrolling interests | 0 us-gaap_NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsRedeemable / dei_LegalEntityAxis = rnr_SubsidiaryIssuerOneMember | 0 us-gaap_NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsRedeemable / dei_LegalEntityAxis = rnr_SubsidiaryIssuerOneMember
Comprehensive income attributable to noncontrolling interests | 0 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = rnr_SubsidiaryIssuerOneMember | 0 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = rnr_SubsidiaryIssuerOneMember
Comprehensive income attributable to RenaissanceRe | 43,536 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = rnr_SubsidiaryIssuerOneMember | (3,190)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = rnr_SubsidiaryIssuerOneMember
Platinum Underwriters Finance, Inc. |  |
Condensed Financial Statements, Captions [Line Items] |  |
Net income | (3,213)us-gaap_ProfitLoss / dei_LegalEntityAxis = rnr_SubsidiaryIssuerTwoMember |
Change in net unrealized gains on investments | 0 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = rnr_SubsidiaryIssuerTwoMember |
Comprehensive income | (3,213)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = rnr_SubsidiaryIssuerTwoMember |
Net income attributable to noncontrolling interests | 0 us-gaap_NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsRedeemable / dei_LegalEntityAxis = rnr_SubsidiaryIssuerTwoMember |
Comprehensive income attributable to noncontrolling interests | 0 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = rnr_SubsidiaryIssuerTwoMember |
Comprehensive income attributable to RenaissanceRe | (3,213)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = rnr_SubsidiaryIssuerTwoMember |
RenaissanceRe Finance, Inc. |  |
Condensed Financial Statements, Captions [Line Items] |  |
Net income | (3,335)us-gaap_ProfitLoss / dei_LegalEntityAxis = rnr_SubsidiaryIssuerThreeMember |
Change in net unrealized gains on investments | 0 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = rnr_SubsidiaryIssuerThreeMember |
Comprehensive income | (3,335)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = rnr_SubsidiaryIssuerThreeMember |
Net income attributable to noncontrolling interests | 0 us-gaap_NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsRedeemable / dei_LegalEntityAxis = rnr_SubsidiaryIssuerThreeMember |
Comprehensive income attributable to noncontrolling interests | 0 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = rnr_SubsidiaryIssuerThreeMember |
Comprehensive income attributable to RenaissanceRe | (3,335)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = rnr_SubsidiaryIssuerThreeMember |
Other RenaissanceRe Holdings Ltd. Subsidiaries And Eliminations (Non-Guarantor Subsidiaries) |  |
Condensed Financial Statements, Captions [Line Items] |  |
Net income | 229,172 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 206,870 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Change in net unrealized gains on investments | (74)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (168)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Comprehensive income | 229,098 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 206,702 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Net income attributable to noncontrolling interests | (39,662)us-gaap_NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsRedeemable / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (42,768)us-gaap_NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsRedeemable / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Comprehensive income attributable to noncontrolling interests | (39,662)us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (42,768)us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Comprehensive income attributable to RenaissanceRe | 189,436 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 163,934 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Consolidating Adjustments |  |
Condensed Financial Statements, Captions [Line Items] |  |
Net income | (206,938)us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (160,912)us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Change in net unrealized gains on investments | 0 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Comprehensive income | (206,938)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (160,912)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Net income attributable to noncontrolling interests | 0 us-gaap_NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsRedeemable / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsRedeemable / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Comprehensive income attributable to noncontrolling interests | 0 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Comprehensive income attributable to RenaissanceRe | $ (206,938)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | $ (160,912)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember

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