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Investments (Schedule of Contractual Maturities of Fixed Maturity Investments) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Trading Securities [Abstract]    
Fixed maturity investments trading, Due in less than one year, Amortized cost $ 153,250rnr_TradingSecuritiesDebtMaturitiesWithinOneYearAmortizedCostBasis  
Fixed maturity investments trading, Due after one through five years, Amortized cost 2,976,602rnr_TradingSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCostBasis  
Fixed maturity investments trading, Due after five through ten years, Amortized cost 544,285rnr_TradingSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCostBasis  
Fixed maturity investments trading, Due after ten years, Amortized cost 140,294rnr_TradingSecuritiesDebtMaturitiesAfterTenYearsAmortizedCostBasis  
Fixed maturity investments trading, Amortized cost 4,749,613us-gaap_TradingSecuritiesDebtAmortizedCost 4,781,712us-gaap_TradingSecuritiesDebtAmortizedCost
Fixed maturity investments trading, Due in less than one year, Fair value 151,803rnr_TradingSecuritiesDebtMaturitiesWithinOneYearFairValue  
Fixed maturity investments trading, Due after one through five years, Fair value 2,969,828rnr_TradingSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue  
Fixed maturity investments trading, Due after five through ten years, Fair value 537,636rnr_TradingSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue  
Fixed maturity investments trading, Due after ten years, Fair value 145,972rnr_TradingSecuritiesDebtMaturitiesAfterTenYearsFairValue  
Fixed maturity investments trading, Fair value 4,756,685us-gaap_TradingSecurities  
Available-for-sale Securities [Abstract]    
Fixed maturity investments available-for-sale, Due in less than one year, Amortized Cost 0us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost  
Fixed maturity investments available-for-sale, Due after one through five years, Amortized cost 0us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost  
Fixed maturity investments available-for-sale, Due after five through ten years, Amortized cost 0us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost  
Fixed maturity investments available-for-sale, Due after ten years, Amortized cost 0us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost  
Fixed maturity investments available-for-sale, Amortized cost 23,772us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis 30,273us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Fixed maturity investments available-for-sale, Due in less than one year, Fair value 0us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue  
Fixed maturity investments available-for-sale, Due after one through five years, Fair value 0us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue  
Fixed maturity investments available-for-sale, Due after five through ten years, Fair value 0us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue  
Fixed maturity investments available-for-sale, Due after ten years, Fair value 0us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue  
Fixed maturity investments available-for-sale, Fair value 26,885us-gaap_AvailableForSaleSecuritiesDebtSecurities 34,241us-gaap_AvailableForSaleSecuritiesDebtSecurities
Fixed Maturity Investments [Abstract]    
Fixed maturity investments, Due in less than one year, Amortized cost 153,250rnr_SecuritiesDebtMaturitiesWithinOneYearAmortizedCostBasis  
Fixed maturity investments, Due after one through five years, Amortized cost 2,976,602rnr_SecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCostBasis  
Fixed maturity investments, Due after five through ten years, Amortized cost 544,285rnr_SecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCostBasis  
Fixed maturity investments, Due after ten years, Amortized cost 140,294rnr_SecuritiesDebtMaturitiesAfterTenYearsAmortizedCostBasis  
Fixed maturity investments, Amortized cost 4,773,385rnr_SecuritiesDebtAmortizedCostBasis  
Fixed maturity investments, Due in less than one year, Fair value 151,803rnr_SecuritiesDebtMaturitiesWithinOneYearFairValue  
Fixed maturity investments, Due after one through give years, Fair value 2,969,828rnr_SecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue  
Fixed maturity investments, Due after five through ten years, Fair value 537,636rnr_SecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue  
Fixed maturity investments, Due after ten years, Fair value 145,972rnr_SecuritiesDebtMaturitiesAfterTenYearsFairValue  
Fixed maturity investments, Fair value 4,783,570rnr_SecuritiesDebt  
Mortgage-backed    
Trading Securities [Abstract]    
Fixed maturity investments trading, Amortized cost 910,897us-gaap_TradingSecuritiesDebtAmortizedCost
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesMember
 
Fixed maturity investments trading, Fair value 927,040us-gaap_TradingSecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesMember
 
Available-for-sale Securities [Abstract]    
Fixed maturity investments available-for-sale, Amortized cost 20,697us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesMember
 
Fixed maturity investments available-for-sale, Fair value 23,681us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesMember
 
Fixed Maturity Investments [Abstract]    
Fixed maturity investments, Amortized cost 931,594rnr_SecuritiesDebtAmortizedCostBasis
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesMember
 
Fixed maturity investments, Fair value 950,721rnr_SecuritiesDebt
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesMember
 
Asset-backed    
Trading Securities [Abstract]    
Fixed maturity investments trading, Amortized cost 24,285us-gaap_TradingSecuritiesDebtAmortizedCost
/ us-gaap_DebtSecurityAxis
= us-gaap_AssetBackedSecuritiesMember
 
Fixed maturity investments trading, Fair value 24,406us-gaap_TradingSecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_AssetBackedSecuritiesMember
 
Available-for-sale Securities [Abstract]    
Fixed maturity investments available-for-sale, Amortized cost 3,075us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_DebtSecurityAxis
= us-gaap_AssetBackedSecuritiesMember
 
Fixed maturity investments available-for-sale, Fair value 3,204us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_AssetBackedSecuritiesMember
 
Fixed Maturity Investments [Abstract]    
Fixed maturity investments, Amortized cost 27,360rnr_SecuritiesDebtAmortizedCostBasis
/ us-gaap_DebtSecurityAxis
= us-gaap_AssetBackedSecuritiesMember
 
Fixed maturity investments, Fair value $ 27,610rnr_SecuritiesDebt
/ us-gaap_DebtSecurityAxis
= us-gaap_AssetBackedSecuritiesMember