Investments (Schedule of Contractual Maturities of Fixed Maturity Investments) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Trading Securities [Abstract]
Trading Debt Securities, Amortized Cost, Due in less than one year	$ 211,238
Trading Debt Securities, Amortized Cost, Due after one through five years	3,219,374
Trading Debt Securities, Amortized Cost, Due after five through ten years	1,018,158
Trading Debt Securities, Amortized Cost, Due after ten years	538,096
Trading Debt Securities, Amortized Cost	5,960,109
Trading Debt Securities, Fair Value, Due in less than one year	209,392
Trading Debt Securities, Fair Value, Due after one through five years	3,220,154
Trading Debt Securities, Fair Value, Due after five through ten years	1,018,252
Trading Debt Securities, Fair Value, Due after ten years	544,522
Trading Debt Securities, Fair Value	5,982,843us-gaap_TradingSecurities
Available-for-sale Securities [Abstract]
Available for Sale, Amortized Cost, Due in less than one year	0
Available for Sale, Amortized Cost, Due after one through five years	0
Available for Sale, Amortized Cost, Due after five through ten years	0
Available for Sale, Amortized Cost, Due after ten years	0
Available for Sale, Amortized Cost	22,156	23,772
Available for Sale, Fair Value, Due in less than one year	0
Available for Sale, Fair Value, Due after one through five years	0
Available for Sale, Fair Value, Due after five through ten years	0
Available for Sale, Fair Value, Due after ten years	0
Available for Sale, Fair Value	25,086	26,885
Fixed Maturity Investments [Abstract]
Debt Securities, Amortized Cost, Due in less than one year	211,238
Debt Securities, Amortized Cost, Due after one through five years	3,219,374
Debt Securities, Amortized Cost, Due after five through ten years	1,018,158
Debt Securities, Amortized Cost, Due after ten years	538,096
Debt Securities, Amortized Cost	5,982,265rnr_SecuritiesDebtAmortizedCostBasis
Debt Securities, Fair Value, Due in less than one year	209,392
Debt Securities, Fair Value, Due after one through give years	3,220,154
Debt Securities, Fair Value, Due after five through ten years	1,018,252
Debt Securities, Fair Value, Due after ten years	544,522
Debt Securities, Fair Value	6,007,929rnr_SecuritiesDebt
Mortgage-backed
Trading Securities [Abstract]
Trading Debt Securities, Amortized Cost	933,152
Trading Debt Securities, Fair Value	950,337
Available-for-sale Securities [Abstract]
Available for Sale, Amortized Cost	19,218
Available for Sale, Fair Value	22,038
Fixed Maturity Investments [Abstract]
Debt Securities, Amortized Cost	952,370
Debt Securities, Fair Value	972,375
Asset-backed
Trading Securities [Abstract]
Trading Debt Securities, Amortized Cost	40,091
Trading Debt Securities, Fair Value	40,186
Available-for-sale Securities [Abstract]
Available for Sale, Amortized Cost	2,938
Available for Sale, Fair Value	3,048
Fixed Maturity Investments [Abstract]
Debt Securities, Amortized Cost	43,029
Debt Securities, Fair Value	$ 43,234

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