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

- Details

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