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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
	Mar. 31, 2015	Mar. 31, 2014
Condensed Financial Statements, Captions [Line Items]
Net income	$ 213,100us-gaap_ProfitLoss	$ 199,366us-gaap_ProfitLoss
Change in net unrealized gains on investments	(74)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	(168)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Comprehensive income	213,026us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	199,198us-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	173,364us-gaap_ComprehensiveIncomeNetOfTax	156,430us-gaap_ComprehensiveIncomeNetOfTax
RenaissanceRe Holdings Ltd. (Parent Guarantor)
Condensed Financial Statements, Captions [Line Items]
Net income	173,438us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	156,598us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Change in net unrealized gains on investments	0us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	0us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Comprehensive income	173,438us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	156,598us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net income attributable to noncontrolling interests	0us-gaap_NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsRedeemable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	0us-gaap_NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsRedeemable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Comprehensive income attributable to noncontrolling interests	0us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	0us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Comprehensive income attributable to RenaissanceRe	173,438us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	156,598us-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	0us-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	0us-gaap_NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsRedeemable / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Comprehensive income attributable to noncontrolling interests	0us-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	43,536us-gaap_ProfitLoss / dei_LegalEntityAxis = rnr_SubsidiaryIssuerOneMember	(3,190)us-gaap_ProfitLoss / dei_LegalEntityAxis = rnr_SubsidiaryIssuerOneMember
Change in net unrealized gains on investments	0us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = rnr_SubsidiaryIssuerOneMember	0us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = rnr_SubsidiaryIssuerOneMember
Comprehensive income	43,536us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = rnr_SubsidiaryIssuerOneMember	(3,190)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = rnr_SubsidiaryIssuerOneMember
Net income attributable to noncontrolling interests	0us-gaap_NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsRedeemable / dei_LegalEntityAxis = rnr_SubsidiaryIssuerOneMember	0us-gaap_NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsRedeemable / dei_LegalEntityAxis = rnr_SubsidiaryIssuerOneMember
Comprehensive income attributable to noncontrolling interests	0us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = rnr_SubsidiaryIssuerOneMember	0us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = rnr_SubsidiaryIssuerOneMember
Comprehensive income attributable to RenaissanceRe	43,536us-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	0us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = rnr_SubsidiaryIssuerTwoMember
Comprehensive income	(3,213)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = rnr_SubsidiaryIssuerTwoMember
Net income attributable to noncontrolling interests	0us-gaap_NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsRedeemable / dei_LegalEntityAxis = rnr_SubsidiaryIssuerTwoMember
Comprehensive income attributable to noncontrolling interests	0us-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	0us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = rnr_SubsidiaryIssuerThreeMember
Comprehensive income	(3,335)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = rnr_SubsidiaryIssuerThreeMember
Net income attributable to noncontrolling interests	0us-gaap_NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsRedeemable / dei_LegalEntityAxis = rnr_SubsidiaryIssuerThreeMember
Comprehensive income attributable to noncontrolling interests	0us-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	229,172us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember	206,870us-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	229,098us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember	206,702us-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	189,436us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember	163,934us-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	0us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember	0us-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	0us-gaap_NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsRedeemable / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember	0us-gaap_NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsRedeemable / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Comprehensive income attributable to noncontrolling interests	0us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember	0us-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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Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.

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