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

X

- 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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- Details

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- Details

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- Details

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