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Derivative Instruments (Narrative) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Long | Interest Rate Futures |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | $ 587.0 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateContractMember / us-gaap_PositionAxis = us-gaap_LongMember | $ 1,169.3 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateContractMember / us-gaap_PositionAxis = us-gaap_LongMember
Long | Foreign Currency Forward Contracts, Underwriting and Non-investment Operations |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 144.8 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = rnr_ForeignCurrencyForwardContractsUnderwritingAndNonInvestmentOperationsMember / us-gaap_PositionAxis = us-gaap_LongMember | 263.6 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = rnr_ForeignCurrencyForwardContractsUnderwritingAndNonInvestmentOperationsMember / us-gaap_PositionAxis = us-gaap_LongMember
Long | Foreign Currency Forward Contracts, Investment Operations |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 35.8 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = rnr_ForeignCurrencyForwardContractsInvestmentOperationsMember / us-gaap_PositionAxis = us-gaap_LongMember | 39.6 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = rnr_ForeignCurrencyForwardContractsInvestmentOperationsMember / us-gaap_PositionAxis = us-gaap_LongMember
Long | Credit Default Swaps |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 4.6 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CreditDefaultSwapMember / us-gaap_PositionAxis = us-gaap_LongMember | 7.1 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CreditDefaultSwapMember / us-gaap_PositionAxis = us-gaap_LongMember
Short | Interest Rate Futures |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 617.4 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateContractMember / us-gaap_PositionAxis = us-gaap_ShortMember | 356.6 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateContractMember / us-gaap_PositionAxis = us-gaap_ShortMember
Short | Foreign Currency Forward Contracts, Underwriting and Non-investment Operations |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 121.6 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = rnr_ForeignCurrencyForwardContractsUnderwritingAndNonInvestmentOperationsMember / us-gaap_PositionAxis = us-gaap_ShortMember | 139.8 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = rnr_ForeignCurrencyForwardContractsUnderwritingAndNonInvestmentOperationsMember / us-gaap_PositionAxis = us-gaap_ShortMember
Short | Foreign Currency Forward Contracts, Investment Operations |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 150.1 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = rnr_ForeignCurrencyForwardContractsInvestmentOperationsMember / us-gaap_PositionAxis = us-gaap_ShortMember | 159.1 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = rnr_ForeignCurrencyForwardContractsInvestmentOperationsMember / us-gaap_PositionAxis = us-gaap_ShortMember
Short | Credit Default Swaps |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 19.4 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CreditDefaultSwapMember / us-gaap_PositionAxis = us-gaap_ShortMember | 18.4 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CreditDefaultSwapMember / us-gaap_PositionAxis = us-gaap_ShortMember
Short | Weather Contract |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | $ 2.2 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = rnr_WeatherContractMember / us-gaap_PositionAxis = us-gaap_ShortMember | $ 6.4 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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