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Investments (Schedule of Other Investments) (Details) (USD $) | 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
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other investments | $ 504,147,000 us-gaap_OtherInvestments |  |  |  | $ 573,264,000 us-gaap_OtherInvestments |  |  |  | $ 504,147,000 us-gaap_OtherInvestments | $ 573,264,000 us-gaap_OtherInvestments |
Net investment income | 25,886,000 us-gaap_NetInvestmentIncome | 24,941,000 us-gaap_NetInvestmentIncome | 34,541,000 us-gaap_NetInvestmentIncome | 38,948,000 us-gaap_NetInvestmentIncome | 78,732,000 us-gaap_NetInvestmentIncome | 59,931,000 us-gaap_NetInvestmentIncome | 26,163,000 us-gaap_NetInvestmentIncome | 43,202,000 us-gaap_NetInvestmentIncome | 124,316,000 us-gaap_NetInvestmentIncome | 208,028,000 us-gaap_NetInvestmentIncome | 165,725,000 us-gaap_NetInvestmentIncome
Net unrealized gains (losses) recognized in earnings |  |  |  |  |  |  |  |  | (1,393,000)us-gaap_UnrealizedGainLossOnInvestments | 75,789,000 us-gaap_UnrealizedGainLossOnInvestments | 38,207,000 us-gaap_UnrealizedGainLossOnInvestments
Initial commitments | 623,800,000 rnr_PrivateEquityPartnershipsAndOtherEntitiesInitialCommitments |  |  |  |  |  |  |  | 623,800,000 rnr_PrivateEquityPartnershipsAndOtherEntitiesInitialCommitments |  |
Fulfilled commitments | 544,100,000 rnr_PrivateEquityPartnershipsAndOtherEntitiesCommitmentsFulfilled |  |  |  |  |  |  |  | 544,100,000 rnr_PrivateEquityPartnershipsAndOtherEntitiesCommitmentsFulfilled |  |
Unfunded commitments | 84,000,000 rnr_PrivateEquityPartnershipsAndOtherEntitiesUnfundedCommitments |  |  |  |  |  |  |  | 84,000,000 rnr_PrivateEquityPartnershipsAndOtherEntitiesUnfundedCommitments |  |
Other Investments |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | 30,000,000 us-gaap_NetInvestmentIncome / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_OtherInvestmentsMember | 119,500,000 us-gaap_NetInvestmentIncome / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_OtherInvestmentsMember | 71,800,000 us-gaap_NetInvestmentIncome / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_OtherInvestmentsMember
Net investment income | Other Investments |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net unrealized gains (losses) recognized in earnings |  |  |  |  |  |  |  |  | (1,400,000)us-gaap_UnrealizedGainLossOnInvestments / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_OtherInvestmentsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InvestmentIncomeMember | 75,800,000 us-gaap_UnrealizedGainLossOnInvestments / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_OtherInvestmentsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InvestmentIncomeMember | 38,200,000 us-gaap_UnrealizedGainLossOnInvestments / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_OtherInvestmentsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InvestmentIncomeMember
Private equity partnerships |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other investments |  |  |  |  | 322,391,000 us-gaap_OtherInvestments / us-gaap_InvestmentTypeAxis = us-gaap_PrivateEquityFundsMember |  |  |  |  | 322,391,000 us-gaap_OtherInvestments / us-gaap_InvestmentTypeAxis = us-gaap_PrivateEquityFundsMember |
Catastrophe bonds |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other investments |  |  |  |  | 229,016,000 us-gaap_OtherInvestments / us-gaap_InvestmentTypeAxis = rnr_CatastropheBondsMember |  |  |  |  | 229,016,000 us-gaap_OtherInvestments / us-gaap_InvestmentTypeAxis = rnr_CatastropheBondsMember |
Senior secured bank loan funds |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other investments |  |  |  |  | 18,048,000 us-gaap_OtherInvestments / us-gaap_InvestmentTypeAxis = rnr_SeniorSecuredBankLoanFundsMember |  |  |  |  | 18,048,000 us-gaap_OtherInvestments / us-gaap_InvestmentTypeAxis = rnr_SeniorSecuredBankLoanFundsMember |
Hedge funds |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other investments |  |  |  |  | 3,809,000 us-gaap_OtherInvestments / us-gaap_InvestmentTypeAxis = us-gaap_HedgeFundsMember |  |  |  |  | 3,809,000 us-gaap_OtherInvestments / us-gaap_InvestmentTypeAxis = us-gaap_HedgeFundsMember |
Change in estimate of fair value | Other Investments |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | (600,000)us-gaap_NetInvestmentIncome / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_OtherInvestmentsMember / us-gaap_InvestmentTypeAxis = us-gaap_ChangeDuringPeriodFairValueDisclosureMember | (3,700,000)us-gaap_NetInvestmentIncome / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_OtherInvestmentsMember / us-gaap_InvestmentTypeAxis = us-gaap_ChangeDuringPeriodFairValueDisclosureMember | (4,700,000)us-gaap_NetInvestmentIncome / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_OtherInvestmentsMember / us-gaap_InvestmentTypeAxis = us-gaap_ChangeDuringPeriodFairValueDisclosureMember
Private equity partnerships |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other investments | 281,932,000 us-gaap_OtherInvestments / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_PrivateEquityFundsMember |  |  |  | 322,391,000 us-gaap_OtherInvestments / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_PrivateEquityFundsMember |  |  |  | 281,932,000 us-gaap_OtherInvestments / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_PrivateEquityFundsMember | 322,391,000 us-gaap_OtherInvestments / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_PrivateEquityFundsMember |
Catastrophe bonds |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other investments | 200,329,000 us-gaap_OtherInvestments / us-gaap_FairValueByMeasurementBasisAxis = rnr_CatastropheBondsMember |  |  |  | 229,016,000 us-gaap_OtherInvestments / us-gaap_FairValueByMeasurementBasisAxis = rnr_CatastropheBondsMember |  |  |  | 200,329,000 us-gaap_OtherInvestments / us-gaap_FairValueByMeasurementBasisAxis = rnr_CatastropheBondsMember | 229,016,000 us-gaap_OtherInvestments / us-gaap_FairValueByMeasurementBasisAxis = rnr_CatastropheBondsMember |
Senior secured bank loan funds |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other investments | 19,316,000 us-gaap_OtherInvestments / us-gaap_FairValueByMeasurementBasisAxis = rnr_SeniorSecuredBankLoanFundsMember |  |  |  | 18,048,000 us-gaap_OtherInvestments / us-gaap_FairValueByMeasurementBasisAxis = rnr_SeniorSecuredBankLoanFundsMember |  |  |  | 19,316,000 us-gaap_OtherInvestments / us-gaap_FairValueByMeasurementBasisAxis = rnr_SeniorSecuredBankLoanFundsMember | 18,048,000 us-gaap_OtherInvestments / us-gaap_FairValueByMeasurementBasisAxis = rnr_SeniorSecuredBankLoanFundsMember |
Hedge funds |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other investments | $ 2,570,000 us-gaap_OtherInvestments / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_HedgeFundsMember |  |  |  | $ 3,809,000 us-gaap_OtherInvestments / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_HedgeFundsMember |  |  |  | $ 2,570,000 us-gaap_OtherInvestments / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_HedgeFundsMember | $ 3,809,000 us-gaap_OtherInvestments / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_HedgeFundsMember |

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