Schedule II. Condensed Financial Information Of Registrant - Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net income (loss) attributable to RenaissanceRe	$ 2,561,132	$ (1,061,203)	$ (40,155)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities
Net realized and unrealized (gains) losses on investments	(482,794)	1,635,192	205,897
Other	(579,280)	(259,168)	(437,221)
Net cash provided by (used in) operating activities	1,911,634	1,603,683	1,234,815
Net Cash Provided by (Used in) Investing Activities [Abstract]
Proceeds from maturities and sales of fixed maturity investments trading	21,796,577	22,086,168	15,543,565
Purchases of fixed maturity investments trading	(24,771,411)	(24,923,131)	(15,680,351)
Net sales (purchases) of short term investments	1,843,180	640,411	(252,833)
Return of investment from investment in other ventures	5,554	2,248	8,345
Net purchase of Validus	(2,433,746)	0	0
Net cash provided by (used in) investing activities	(3,822,636)	(3,016,176)	(816,296)
Cash flows provided by (used in) financing activities
Dividends paid – RenaissanceRe common shares	(75,112)	(64,675)	(67,828)
Dividends paid – preference shares	(35,375)	(35,396)	(32,889)
Issuance of debt, net of expenses	740,581	0	0
RenaissanceRe common share repurchases	0	(166,664)	(1,027,505)
RenaissanceRe common share issuance	1,351,608	0	0
Redemption of preference shares	0	0	(275,000)
Issuance of preference shares, net of expenses	0	0	488,653
Taxes paid on withholding shares	(20,518)	(10,911)	(12,171)
Net cash provided by (used in) financing activities	2,588,639	725,342	(302,461)
Effect of exchange rate changes on foreign currency cash	5,542	22,471	6,148
Net increase (decrease) in cash and cash equivalents	683,179	(664,680)	122,206
Cash and cash equivalents, beginning of year	1,194,339	1,859,019	1,736,813
Cash and cash equivalents, end of year	1,877,518	1,194,339	1,859,019
Parent Company
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net income (loss) attributable to RenaissanceRe	2,561,131	(1,061,204)	(40,155)
Less: equity in net income of subsidiaries	(2,708,061)	988,610	10,670
Loss before equity in net income of subsidiaries	(146,930)	(72,594)	(29,485)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities
Net realized and unrealized (gains) losses on investments	67,868	2,051	4,898
Other	72,691	36,601	59,873
Net cash provided by (used in) operating activities	(6,371)	(33,942)	35,286
Net Cash Provided by (Used in) Investing Activities [Abstract]
Proceeds from maturities and sales of fixed maturity investments trading	1,613,740	198,341	436,122
Purchases of fixed maturity investments trading	(1,505,160)	(375,804)	(421,323)
Net sales (purchases) of short term investments	(211,370)	(21,037)	78,904
Return of investment from investment in other ventures	1,097,301	1,009,108	1,104,831
Contributions to subsidiaries	(169,204)	(349,336)	(351,548)
Due to (from) subsidiary	(7,088)	(178,470)	50,472
Net cash provided by (used in) investing activities	(1,916,781)	282,802	897,458
Cash flows provided by (used in) financing activities
Dividends paid – RenaissanceRe common shares	(75,112)	(64,675)	(67,828)
Dividends paid – preference shares	(35,375)	(35,396)	(32,889)
Issuance of debt, net of expenses	740,581	0	0
RenaissanceRe common share repurchases	0	(166,664)	(1,027,505)
RenaissanceRe common share issuance	1,351,608	0	0
Redemption of preference shares	0	0	(275,000)
Issuance of preference shares, net of expenses	0	0	488,653
Taxes paid on withholding shares	(20,518)	(10,911)	(12,171)
Net cash provided by (used in) financing activities	1,961,184	(277,646)	(926,740)
Effect of exchange rate changes on foreign currency cash	0	0	0
Net increase (decrease) in cash and cash equivalents	38,032	(28,786)	6,004
Cash and cash equivalents, beginning of year	7,048	35,834	29,830
Cash and cash equivalents, end of year	45,080	7,048	35,834
Parent Company | Validus Specialty
Net Cash Provided by (Used in) Investing Activities [Abstract]
Due to (from) subsidiary	(45,467)	0	0
Parent Company | Validus Holdings, Ltd and Talbot Underwriting Limited
Net Cash Provided by (Used in) Investing Activities [Abstract]
Net purchase of Validus	$ (2,689,533)	$ 0	$ 0