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Investments (Schedule of Net Realized and Unrealized Gains on Investments and Net Other-Than-Temporary Impairments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Gain (Loss) on Investments [Line Items]
Net realized and unrealized gains on investments	$ 30,475us-gaap_GainLossOnInvestments	$ (31,097)us-gaap_GainLossOnInvestments	$ 27,128us-gaap_GainLossOnInvestments	$ 14,927us-gaap_GainLossOnInvestments	$ 61,864us-gaap_GainLossOnInvestments	$ 28,472us-gaap_GainLossOnInvestments	$ (69,529)us-gaap_GainLossOnInvestments	$ 14,269us-gaap_GainLossOnInvestments	$ 41,433us-gaap_GainLossOnInvestments	$ 35,076us-gaap_GainLossOnInvestments	$ 163,121us-gaap_GainLossOnInvestments
Total other-than-temporary impairments									0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities	0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities	(395)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities
Portion recognized in other comprehensive income (loss), before taxes									0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities	0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities	52us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities
Net other-than-temporary impairments recognized in earnings									0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities	0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities	(343)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities
Fixed maturity investments
Gain (Loss) on Investments [Line Items]
Gross realized gains									45,568rnr_DebtSecuritiesRealizedGain / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_FixedMaturitiesMember	72,492rnr_DebtSecuritiesRealizedGain / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_FixedMaturitiesMember	97,787rnr_DebtSecuritiesRealizedGain / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_FixedMaturitiesMember
Gross realized losses									(14,868)rnr_DebtSecuritiesRealizedLoss / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_FixedMaturitiesMember	(50,206)rnr_DebtSecuritiesRealizedLoss / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_FixedMaturitiesMember	(16,705)rnr_DebtSecuritiesRealizedLoss / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_FixedMaturitiesMember
Net realized gains on fixed maturity investments									30,700rnr_DebtSecuritiesRealizedGainLossNet / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_FixedMaturitiesMember	22,286rnr_DebtSecuritiesRealizedGainLossNet / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_FixedMaturitiesMember	81,082rnr_DebtSecuritiesRealizedGainLossNet / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_FixedMaturitiesMember
Net unrealized gains (losses) on fixed maturity investments trading									19,680us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_FixedMaturitiesMember	(87,827)us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_FixedMaturitiesMember	75,279us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_FixedMaturitiesMember
Investments-related derivatives
Gain (Loss) on Investments [Line Items]
Net realized and unrealized (losses) gains on investments-related derivatives									(30,931)rnr_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsInvestmentPortfolioGainLoss / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_DerivativeMember	31,058rnr_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsInvestmentPortfolioGainLoss / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_DerivativeMember	(866)rnr_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsInvestmentPortfolioGainLoss / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_DerivativeMember
Equity investments
Gain (Loss) on Investments [Line Items]
Net unrealized gains (losses) on fixed maturity investments trading									11,076us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_EquitySecuritiesMember	42,909us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_EquitySecuritiesMember	7,626us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_EquitySecuritiesMember
Net realized gains on equity investments trading									$ 10,908us-gaap_TradingSecuritiesRealizedGain / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_EquitySecuritiesMember	$ 26,650us-gaap_TradingSecuritiesRealizedGain / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_EquitySecuritiesMember	$ 0us-gaap_TradingSecuritiesRealizedGain / us-gaap_GainLossOnInvestmentsByCategoryAxis = us-gaap_EquitySecuritiesMember

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Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments and relating to the entity's investment portfolio.

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The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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