Schedule II. Condensed Financial Information Of Registrant (Statements of Cash Flows) (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows provided by (used in) operating activities:
Net income attributable to RenaissanceRe	$ 532,718,000us-gaap_NetIncomeLoss	$ 690,624,000us-gaap_NetIncomeLoss	$ 600,909,000us-gaap_NetIncomeLoss
Less: equity in net (income) loss of subsidiaries	0	0	0
Adjustments to reconcile net income to net cash provided by operating activities
Net unrealized losses (gains) included in net investment income	1,393,000us-gaap_UnrealizedGainLossOnInvestments	(75,789,000)us-gaap_UnrealizedGainLossOnInvestments	(38,207,000)us-gaap_UnrealizedGainLossOnInvestments
Net unrealized losses (gains) included in other loss	1,612,000us-gaap_UnrealizedGainLossOnSecurities	12,782,000us-gaap_UnrealizedGainLossOnSecurities	(330,000)us-gaap_UnrealizedGainLossOnSecurities
Net realized and unrealized gains on investments	(41,433,000)us-gaap_GainLossOnInvestments	(35,076,000)us-gaap_GainLossOnInvestments	(163,121,000)us-gaap_GainLossOnInvestments
Other	(71,146,000)	159,892,000	(8,074,000)
Net cash provided by operating activities	660,657,000	795,721,000	716,929,000
Cash flows provided by (used in) investing activities
Proceeds from maturities and sales of fixed maturity investments trading	7,682,573,000	8,251,405,000	8,192,867,000
Purchases of fixed maturity investments trading	(7,639,178,000)	(8,466,467,000)	(8,536,238,000)
Net (purchases) sales of short term investments	45,023,000	(246,971,000)	68,777,000
Contributions to subsidiaries	0	0	0
Net cash provided by (used in) investing activities	141,653,000	(315,515,000)	(71,677,000)
Cash flows used in financing activities
Dividends paid – RenaissanceRe common shares	(45,912,000)us-gaap_PaymentsOfDividendsCommonStock	(49,267,000)us-gaap_PaymentsOfDividendsCommonStock	(53,356,000)us-gaap_PaymentsOfDividendsCommonStock
Dividends paid – preference shares	(22,381,000)	(24,948,000)	(34,895,000)
RenaissanceRe common share repurchases	(514,678,000)	(207,410,000)	(463,309,000)
Redemption of preference shares		(125,000,000)	(150,000,000)
Net repayment of debt	0us-gaap_ProceedsFromRepaymentsOfDebt	(102,436,000)us-gaap_ProceedsFromRepaymentsOfDebt	(1,937,000)us-gaap_ProceedsFromRepaymentsOfDebt
Net cash used in financing activities	(694,678,000)	(398,955,000)	(538,570,000)
Net increase (decrease) in cash and cash equivalents	117,552,000	82,674,000	108,374,000
Cash and cash equivalents, beginning of period	408,032,000	304,145,000	181,825,000
Cash and cash equivalents, end of period	525,584,000	408,032,000	304,145,000
Parent Company
Cash flows provided by (used in) operating activities:
Net income attributable to RenaissanceRe	532,718,000	690,624,000	600,909,000
Less: equity in net (income) loss of subsidiaries	(545,839,000)	(713,831,000)	(584,051,000)
Income (loss) before equity in net income (loss) of subsidiaries and taxes	(13,121,000)	(23,207,000)	16,858,000
Adjustments to reconcile net income to net cash provided by operating activities
Net unrealized losses (gains) included in net investment income	0	0	348,000
Net unrealized losses (gains) included in other loss	0	(20,000)	(193,000)
Net realized and unrealized gains on investments	(83,000)	483,000	(14,862,000)
Other	13,633,000	(15,222,000)	126,416,000
Net cash provided by operating activities	429,000	(37,966,000)	128,567,000
Cash flows provided by (used in) investing activities
Proceeds from maturities and sales of fixed maturity investments trading	88,273,000	880,749,000	744,211,000
Purchases of fixed maturity investments trading	(88,341,000)	(491,768,000)	(692,783,000)
Net (purchases) sales of short term investments	73,717,000	21,217,000	(80,485,000)
Dividends and return of capital from subsidiaries	1,259,224,000	504,241,000	979,311,000
Contributions to subsidiaries	(759,456,000)	(500,652,000)	(366,210,000)
Due to (from) subsidiary	6,315,000	17,446,000	(15,359,000)
Net cash provided by (used in) investing activities	579,732,000	431,233,000	568,685,000
Cash flows used in financing activities
Dividends paid – RenaissanceRe common shares	(45,912,000)	(49,267,000)	(53,356,000)
Dividends paid – preference shares	(22,381,000)	(24,948,000)	(34,895,000)
RenaissanceRe common share repurchases	(514,678,000)	(207,410,000)	(463,309,000)
Redemption of preference shares		(125,000,000)	(150,000,000)
Net repayment of debt	0	(100,000,000)	0
Net cash used in financing activities	(582,971,000)	(390,769,000)	(701,560,000)
Net increase (decrease) in cash and cash equivalents	(2,810,000)	2,498,000	(4,308,000)
Cash and cash equivalents, beginning of period	8,796,000	6,298,000	10,606,000
Cash and cash equivalents, end of period	5,986,000	8,796,000	6,298,000
Series C Preferred Stock
Cash flows used in financing activities
Redemption of preference shares	0	(125,000,000)	0
Series C Preferred Stock \| Parent Company
Cash flows used in financing activities
Redemption of preference shares	0	(125,000,000)	0
Series D Preferred Stock
Cash flows used in financing activities
Redemption of preference shares	0	(150,000,000)	(150,000,000)
Series D Preferred Stock \| Parent Company
Cash flows used in financing activities
Redemption of preference shares	0	(150,000,000)	(150,000,000)
Series E Preferred Stock
Cash flows used in financing activities
Issuance of 5.375% Series E preference shares, net of expenses	0	265,856,000	0
Series E Preferred Stock \| Parent Company
Cash flows used in financing activities
Issuance of 5.375% Series E preference shares, net of expenses	$ 0	$ 265,856,000	$ 0

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