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Derivative Instruments (Narrative) (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Interest Rate Contracts | Long |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | $ 1,624.5 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateContractMember / us-gaap_PositionAxis = us-gaap_LongMember | $ 587.0 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateContractMember / us-gaap_PositionAxis = us-gaap_LongMember
Interest Rate Contracts | Short |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 1,378.0 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateContractMember / us-gaap_PositionAxis = us-gaap_ShortMember | 617.4 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateContractMember / us-gaap_PositionAxis = us-gaap_ShortMember
Foreign Currency Forward Contracts, Underwriting and Non-investment Operations | Long |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 281.5 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = rnr_ForeignCurrencyForwardContractsUnderwritingAndNonInvestmentOperationsMember / us-gaap_PositionAxis = us-gaap_LongMember | 144.8 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = rnr_ForeignCurrencyForwardContractsUnderwritingAndNonInvestmentOperationsMember / us-gaap_PositionAxis = us-gaap_LongMember
Foreign Currency Forward Contracts, Underwriting and Non-investment Operations | Short |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 255.2 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = rnr_ForeignCurrencyForwardContractsUnderwritingAndNonInvestmentOperationsMember / us-gaap_PositionAxis = us-gaap_ShortMember | 121.6 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = rnr_ForeignCurrencyForwardContractsUnderwritingAndNonInvestmentOperationsMember / us-gaap_PositionAxis = us-gaap_ShortMember
Foreign Currency Forward Contracts, Investment Operations | Long |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 13.7 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = rnr_ForeignCurrencyForwardContractsInvestmentOperationsMember / us-gaap_PositionAxis = us-gaap_LongMember | 35.8 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = rnr_ForeignCurrencyForwardContractsInvestmentOperationsMember / us-gaap_PositionAxis = us-gaap_LongMember
Foreign Currency Forward Contracts, Investment Operations | Short |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 107.7 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = rnr_ForeignCurrencyForwardContractsInvestmentOperationsMember / us-gaap_PositionAxis = us-gaap_ShortMember | 150.1 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = rnr_ForeignCurrencyForwardContractsInvestmentOperationsMember / us-gaap_PositionAxis = us-gaap_ShortMember
Credit Default Swaps | Long |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 0 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CreditDefaultSwapMember / us-gaap_PositionAxis = us-gaap_LongMember | 4.6 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CreditDefaultSwapMember / us-gaap_PositionAxis = us-gaap_LongMember
Credit Default Swaps | Short |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 31.3 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CreditDefaultSwapMember / us-gaap_PositionAxis = us-gaap_ShortMember | 19.4 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CreditDefaultSwapMember / us-gaap_PositionAxis = us-gaap_ShortMember
Weather Contract | Short |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | $ 2.0 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = rnr_WeatherContractMember / us-gaap_PositionAxis = us-gaap_ShortMember | $ 2.2 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = rnr_WeatherContractMember / us-gaap_PositionAxis = us-gaap_ShortMember

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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