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