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Condensed Consolidating Financial Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Statement Of Cash Flows) (Details) - USD ($)	1 Months Ended			12 Months Ended
	May. 31, 2013	Dec. 31, 2006	Mar. 31, 2004	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows provided by (used in) operating activities:
Net cash provided by operating activities				$ 414,737,000	$ 660,657,000	$ 795,721,000
Cash flows provided by (used in) investing activities
Proceeds from sales and maturities of fixed maturity investments trading				9,481,742,000	7,682,573,000	8,251,405,000
Purchases of fixed maturity investments trading				(9,683,068,000)	(7,639,178,000)	(8,466,467,000)
Proceeds from sales and maturities of fixed maturity investments available for sale				8,688,000	7,088,000	45,178,000
Net (purchases) sales of equity investments trading				(147,558,000)	(20,003,000)	(33,055,000)
Net (purchases) sales of short term investments				669,116,000	45,023,000	(246,971,000)
Net sales of other investments				15,843,000	59,120,000	76,214,000
Net purchases of investments in other ventures				(10,150,000)	1,030,000	(4,000,000)
Net sales of other assets				4,500,000	6,000,000	2,181,000
Dividends and return of capital from subsidiaries				0	0	0
Contributions to subsidiaries				0	0	0
Due (from) to subsidiary				0	0	0
Net purchase of Platinum				(678,152,000)	0	0
Net proceeds related to sale of discontinued operations				0	0	60,000,000
Net cash (used in) provided by investing activities				(339,039,000)	141,653,000	(315,515,000)
Cash flows (used in) provided by financing activities
Dividends paid – RenaissanceRe common shares				(53,967,000)	(45,912,000)	(49,267,000)
Dividends paid – preference shares				(22,381,000)	(22,381,000)	(24,948,000)
RenaissanceRe common share repurchases				(259,874,000)	(514,678,000)	(207,410,000)
Issuance of debt				445,589,000	0	0
Repayment of debt						(102,436,000)
Contribution of capital from parent						0
Net third party redeemable noncontrolling interest share transactions				(193,032,000)	(111,707,000)	(5,750,000)
Net cash used in financing activities				(83,665,000)	(694,678,000)	(398,955,000)
Effect of exchange rate changes on foreign currency cash				(10,732,000)	9,920,000	1,423,000
Net (decrease) increase in cash and cash equivalents				(18,699,000)	117,552,000	82,674,000
Net decrease in cash and cash equivalents of discontinued operations				0	0	21,213,000
Cash and cash equivalents, beginning of period				525,584,000	408,032,000	304,145,000
Cash and cash equivalents, end of period				506,885,000	525,584,000	408,032,000
RenaissanceRe Holdings Ltd. (Parent Guarantor)
Cash flows provided by (used in) operating activities:
Net cash provided by operating activities				(39,213,000)	429,000	(36,508,000)
Cash flows provided by (used in) investing activities
Proceeds from sales and maturities of fixed maturity investments trading				63,824,000	88,273,000	880,749,000
Purchases of fixed maturity investments trading				(161,183,000)	(88,341,000)	(491,768,000)
Proceeds from sales and maturities of fixed maturity investments available for sale				0	0	0
Net (purchases) sales of equity investments trading				0	0	0
Net (purchases) sales of short term investments				(116,461,000)	73,717,000	21,217,000
Net sales of other investments				0	0	0
Net purchases of investments in other ventures				0	0	0
Net sales of other assets				0	0	0
Dividends and return of capital from subsidiaries				1,584,624,000	1,259,224,000	504,241,000
Contributions to subsidiaries				(294,733,000)	(759,456,000)	(500,652,000)
Due (from) to subsidiary				207,996,000	6,315,000	15,988,000
Net purchase of Platinum				(904,433,000)	0	0
Net proceeds related to sale of discontinued operations						0
Net cash (used in) provided by investing activities				379,634,000	579,732,000	429,775,000
Cash flows (used in) provided by financing activities
Dividends paid – RenaissanceRe common shares				(53,967,000)	(45,912,000)	(49,267,000)
Dividends paid – preference shares				(22,381,000)	(22,381,000)	(24,948,000)
RenaissanceRe common share repurchases				(259,874,000)	(514,678,000)	(207,410,000)
Issuance of debt				0
Repayment of debt				0	0	(100,000,000)
Contribution of capital from parent						0
Net third party redeemable noncontrolling interest share transactions				0	0	0
Net cash used in financing activities				(336,222,000)	(582,971,000)	(390,769,000)
Effect of exchange rate changes on foreign currency cash				0	0	0
Net (decrease) increase in cash and cash equivalents				4,199,000	(2,810,000)	2,498,000
Net decrease in cash and cash equivalents of discontinued operations						0
Cash and cash equivalents, beginning of period				5,986,000	8,796,000	6,298,000
Cash and cash equivalents, end of period				10,185,000	5,986,000	8,796,000
RenRe North America Holdings Inc. (Subsidiary Issuer)
Cash flows provided by (used in) operating activities:
Net cash provided by operating activities				(9,201,000)	(18,114,000)	(9,025,000)
Cash flows provided by (used in) investing activities
Proceeds from sales and maturities of fixed maturity investments trading				49,807,000	20,487,000	185,143,000
Purchases of fixed maturity investments trading				(59,040,000)	(14,969,000)	(160,422,000)
Proceeds from sales and maturities of fixed maturity investments available for sale				0	0	0
Net (purchases) sales of equity investments trading				33,693,000	13,761,000	(81,437,000)
Net (purchases) sales of short term investments				(63,305,000)	225,000	9,399,000
Net sales of other investments				0	0	0
Net purchases of investments in other ventures				0	0	0
Net sales of other assets				0	0	0
Dividends and return of capital from subsidiaries				180,000,000	11,204,000	10,302,000
Contributions to subsidiaries				(8,550,000)	(1,949,000)	(23,821,000)
Due (from) to subsidiary				(118,529,000)	(13,639,000)	57,155,000
Net purchase of Platinum				0
Net proceeds related to sale of discontinued operations						0
Net cash (used in) provided by investing activities				14,076,000	15,120,000	(3,681,000)
Cash flows (used in) provided by financing activities
Dividends paid – RenaissanceRe common shares				0	0	0
Dividends paid – preference shares				0	0	0
RenaissanceRe common share repurchases				0	0	0
Issuance of debt				0
Repayment of debt						0
Contribution of capital from parent						15,205,000
Net third party redeemable noncontrolling interest share transactions				0	0	0
Net cash used in financing activities				0	0	15,205,000
Effect of exchange rate changes on foreign currency cash				0	0	0
Net (decrease) increase in cash and cash equivalents				4,875,000	(2,994,000)	2,499,000
Net decrease in cash and cash equivalents of discontinued operations						0
Cash and cash equivalents, beginning of period				1,033,000	4,027,000	1,528,000
Cash and cash equivalents, end of period				5,908,000	1,033,000	4,027,000
Platinum Underwriters Finance, Inc. (Subsidiary Issuer)
Cash flows provided by (used in) operating activities:
Net cash provided by operating activities				(6,830,000)
Cash flows provided by (used in) investing activities
Proceeds from sales and maturities of fixed maturity investments trading				45,087,000
Purchases of fixed maturity investments trading				0
Proceeds from sales and maturities of fixed maturity investments available for sale				0
Net (purchases) sales of equity investments trading				(269,244,000)
Net (purchases) sales of short term investments				238,177,000
Net sales of other investments				0
Net purchases of investments in other ventures				0
Net sales of other assets				0
Dividends and return of capital from subsidiaries				65,000,000
Contributions to subsidiaries				(66,753,000)
Due (from) to subsidiary				129,000
Net purchase of Platinum				1,537,000
Net cash (used in) provided by investing activities				13,933,000
Cash flows (used in) provided by financing activities
Dividends paid – RenaissanceRe common shares				0
Dividends paid – preference shares				0
RenaissanceRe common share repurchases				0
Issuance of debt				0
Net third party redeemable noncontrolling interest share transactions				0
Net cash used in financing activities				0
Effect of exchange rate changes on foreign currency cash				0
Net (decrease) increase in cash and cash equivalents				7,103,000
Cash and cash equivalents, beginning of period				0
Cash and cash equivalents, end of period				7,103,000	0
RenaissanceRe Finance, Inc. (Subsidiary Issuer)
Cash flows provided by (used in) operating activities:
Net cash provided by operating activities				(17,871,000)
Cash flows provided by (used in) investing activities
Proceeds from sales and maturities of fixed maturity investments trading				0
Purchases of fixed maturity investments trading				0
Proceeds from sales and maturities of fixed maturity investments available for sale				0
Net (purchases) sales of equity investments trading				0
Net (purchases) sales of short term investments				0
Net sales of other investments				0
Net purchases of investments in other ventures				0
Net sales of other assets				0
Dividends and return of capital from subsidiaries				87,553,000
Contributions to subsidiaries				(185,000,000)
Due (from) to subsidiary				(183,405,000)
Net purchase of Platinum				0
Net cash (used in) provided by investing activities				(280,852,000)
Cash flows (used in) provided by financing activities
Dividends paid – RenaissanceRe common shares				0
Dividends paid – preference shares				0
RenaissanceRe common share repurchases				0
Issuance of debt				299,400,000
Net third party redeemable noncontrolling interest share transactions				0
Net cash used in financing activities				299,400,000
Effect of exchange rate changes on foreign currency cash				0
Net (decrease) increase in cash and cash equivalents				677,000
Cash and cash equivalents, beginning of period				0
Cash and cash equivalents, end of period				677,000	0
Other RenaissanceRe Holdings Ltd. Subsidiaries And Eliminations (Non-Guarantor Subsidiaries)
Cash flows provided by (used in) operating activities:
Net cash provided by operating activities				487,852,000	678,342,000	841,254,000
Cash flows provided by (used in) investing activities
Proceeds from sales and maturities of fixed maturity investments trading				9,323,024,000	7,573,813,000	7,185,513,000
Purchases of fixed maturity investments trading				(9,462,845,000)	(7,535,868,000)	(7,814,277,000)
Proceeds from sales and maturities of fixed maturity investments available for sale				8,688,000	7,088,000	45,178,000
Net (purchases) sales of equity investments trading				87,993,000	(33,764,000)	48,382,000
Net (purchases) sales of short term investments				610,705,000	(28,919,000)	(277,587,000)
Net sales of other investments				15,843,000	59,120,000	76,214,000
Net purchases of investments in other ventures				(10,150,000)	1,030,000	(4,000,000)
Net sales of other assets				4,500,000	6,000,000	2,181,000
Dividends and return of capital from subsidiaries				(1,917,177,000)	(1,270,428,000)	(514,543,000)
Contributions to subsidiaries				555,036,000	761,405,000	524,473,000
Due (from) to subsidiary				93,809,000	7,324,000	(73,143,000)
Net purchase of Platinum				224,744,000
Net proceeds related to sale of discontinued operations						60,000,000
Net cash (used in) provided by investing activities				(465,830,000)	(453,199,000)	(741,609,000)
Cash flows (used in) provided by financing activities
Dividends paid – RenaissanceRe common shares				0	0	0
Dividends paid – preference shares				0	0	0
RenaissanceRe common share repurchases				0	0	0
Issuance of debt				146,189,000
Repayment of debt						(2,436,000)
Contribution of capital from parent						(15,205,000)
Net third party redeemable noncontrolling interest share transactions				(193,032,000)	(111,707,000)	(5,750,000)
Net cash used in financing activities				(46,843,000)	(111,707,000)	(23,391,000)
Effect of exchange rate changes on foreign currency cash				(10,732,000)	9,920,000	1,423,000
Net (decrease) increase in cash and cash equivalents				(35,553,000)	123,356,000	77,677,000
Net decrease in cash and cash equivalents of discontinued operations						21,213,000
Cash and cash equivalents, beginning of period				518,565,000	395,209,000	296,319,000
Cash and cash equivalents, end of period				483,012,000	518,565,000	395,209,000
Series C Preferred Stock
Cash flows (used in) provided by financing activities
Redemption of preference shares				0	0	(125,000,000)
Issuance of 5.375% Series E preference shares, net of expenses			$ 250,000,000
Series C Preferred Stock | RenaissanceRe Holdings Ltd. (Parent Guarantor)
Cash flows (used in) provided by financing activities
Redemption of preference shares				0	0	(125,000,000)
Series C Preferred Stock | RenRe North America Holdings Inc. (Subsidiary Issuer)
Cash flows (used in) provided by financing activities
Redemption of preference shares						0
Series C Preferred Stock | Other RenaissanceRe Holdings Ltd. Subsidiaries And Eliminations (Non-Guarantor Subsidiaries)
Cash flows (used in) provided by financing activities
Redemption of preference shares						0
Series D Preferred Stock
Cash flows (used in) provided by financing activities
Redemption of preference shares				0	0	(150,000,000)
Issuance of 5.375% Series E preference shares, net of expenses		$ 300,000,000
Series D Preferred Stock | RenaissanceRe Holdings Ltd. (Parent Guarantor)
Cash flows (used in) provided by financing activities
Redemption of preference shares				0	0	(150,000,000)
Series D Preferred Stock | RenRe North America Holdings Inc. (Subsidiary Issuer)
Cash flows (used in) provided by financing activities
Redemption of preference shares						0
Series D Preferred Stock | Other RenaissanceRe Holdings Ltd. Subsidiaries And Eliminations (Non-Guarantor Subsidiaries)
Cash flows (used in) provided by financing activities
Redemption of preference shares						0
Series E Preferred Stock
Cash flows (used in) provided by financing activities
Issuance of 5.375% Series E preference shares, net of expenses	$ 275,000,000			0	0	265,856,000
Series E Preferred Stock | RenaissanceRe Holdings Ltd. (Parent Guarantor)
Cash flows (used in) provided by financing activities
Issuance of 5.375% Series E preference shares, net of expenses				$ 0	$ 0	265,856,000
Series E Preferred Stock | RenRe North America Holdings Inc. (Subsidiary Issuer)
Cash flows (used in) provided by financing activities
Issuance of 5.375% Series E preference shares, net of expenses						0
Series E Preferred Stock | Other RenaissanceRe Holdings Ltd. Subsidiaries And Eliminations (Non-Guarantor Subsidiaries)
Cash flows (used in) provided by financing activities
Issuance of 5.375% Series E preference shares, net of expenses						$ 0

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