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Schedule II. Condensed Financial Information Of Registrant (Statements of Cash Flows) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows (used in) provided by operating activities
Net income (loss) attributable to RenaissanceRe	$ (74,717)	$ 42,389	$ 197,384	$ 62,308	$ 2,143	$ (499,217)	$ 176,738	$ 97,947	$ 227,364	$ (222,389)	$ 502,962
Less: equity in net (income) loss of subsidiaries									0	0	0
Adjustments to reconcile net income (loss) to net cash provided by operating activities
Net realized and unrealized losses (gains) on investments	88,654	$ (13,630)	$ 17,901	82,144	7,716	$ (42,052)	$ (58,113)	(43,373)	175,069	(135,822)	(141,328)
Other									(223,280)	518,100	99,943
Net cash provided by operating activities									1,221,701	1,025,787	484,772
Cash flows provided by (used in) investing activities
Proceeds from maturities and sales of fixed maturity investments trading									11,585,576	9,490,669	8,102,514
Purchases of fixed maturity investments trading									(12,489,972)	(10,093,532)	(8,282,720)
Net sales (purchases) of short term investments									(1,436,389)	364,011	(118,617)
Dividends and return of capital from subsidiaries									0	0	0
Net cash used in investing activities									(2,536,613)	(122,434)	(164,532)
Cash flows provided by (used in) financing activities
Dividends paid – RenaissanceRe common shares									(52,841)	(51,370)	(51,583)
Dividends paid – preference shares									(30,088)	(22,381)	(22,381)
RenaissanceRe common share repurchases									0	(188,591)	(309,434)
RenaissanceRe common share issuance									250,000	0	0
Issuance of preference shares, net of expenses									241,448	0
Taxes paid on withholding shares									(7,862)	(15,139)	(14,943)
Net cash provided by (used in) financing activities									1,066,340	28,860	(401,331)
Net (decrease) increase in cash and cash equivalents									(253,670)	940,435	(85,728)
Cash and cash equivalents, beginning of period				1,361,592				421,157	1,361,592	421,157	506,885
Cash and cash equivalents, end of period	1,107,922				1,361,592				1,107,922	1,361,592	421,157
Parent Company
Cash flows (used in) provided by operating activities
Net income (loss) attributable to RenaissanceRe									227,364	(222,389)	502,962
Less: equity in net (income) loss of subsidiaries									(240,495)	212,708	(516,533)
Loss before equity in net income of subsidiaries									(13,131)	(9,681)	(13,571)
Adjustments to reconcile net income (loss) to net cash provided by operating activities
Net realized and unrealized losses (gains) on investments									(633)	1,357	(4,151)
Other									4,105	4,215	14,213
Net cash provided by operating activities									(9,659)	(4,109)	(3,509)
Cash flows provided by (used in) investing activities
Proceeds from maturities and sales of fixed maturity investments trading									384,818	261,601	314,568
Purchases of fixed maturity investments trading									(520,935)	(344,463)	(336,345)
Net sales (purchases) of short term investments									48,600	243,571	(111,814)
Dividends and return of capital from subsidiaries									672,098	478,496	617,239
Contributions to subsidiaries									(785,785)	(669,672)	(108,674)
Due to (from) subsidiary									(200,916)	319,646	23,758
Net cash used in investing activities									(402,120)	289,179	398,732
Cash flows provided by (used in) financing activities
Dividends paid – RenaissanceRe common shares									(52,841)	(51,370)	(51,583)
Dividends paid – preference shares									(30,088)	(22,381)	(22,381)
RenaissanceRe common share repurchases									0	(188,591)	(309,434)
RenaissanceRe common share issuance									250,000	0	0
Issuance of preference shares, net of expenses									241,448	0	0
Taxes paid on withholding shares									(7,862)	(15,139)	(14,943)
Net cash provided by (used in) financing activities									400,657	(277,481)	(398,341)
Net (decrease) increase in cash and cash equivalents									(11,122)	7,589	(3,118)
Cash and cash equivalents, beginning of period				$ 14,656				$ 7,067	14,656	7,067	10,185
Cash and cash equivalents, end of period	$ 3,534				$ 14,656				$ 3,534	$ 14,656	$ 7,067

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