Schedule II. Condensed Financial Information Of Registrant - Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows (used in) provided by operating activities
Net income (loss) attributable to RenaissanceRe	$ (1,061,203)	$ (40,155)	$ 762,405
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities
Net realized and unrealized (gains) losses on investments	1,635,192	205,897	(820,636)
Other	(259,168)	(437,221)	178,314
Net cash provided by (used in) operating activities	1,603,683	1,234,815	1,992,735
Cash flows used in investing activities
Proceeds from maturities and sales of fixed maturity investments trading	22,086,168	15,543,565	15,186,952
Purchases of fixed maturity investments trading	(24,923,131)	(15,680,351)	(16,836,538)
Net purchases of short term investments	640,411	(252,833)	(581,473)
Net cash provided by (used in) investing activities	(3,016,176)	(816,296)	(2,304,689)
Cash flows provided by (used in) financing activities
Dividends paid – RenaissanceRe common shares	(64,675)	(67,828)	(68,490)
Dividends paid – preference shares	(35,396)	(32,889)	(30,923)
RenaissanceRe common share repurchases	(166,664)	(1,027,505)	(62,621)
RenaissanceRe common share issuance	0	0	1,095,507
Redemption of preference shares	0	(275,000)	(125,000)
Issuance of preference shares, net of expenses	0	488,653	0
Taxes paid on withholding shares	(10,911)	(12,171)	(12,330)
Net cash provided by (used in) financing activities	725,342	(302,461)	665,214
Effect of exchange rate changes on foreign currency cash	22,471	6,148	4,485
Net increase (decrease) in cash and cash equivalents	(664,680)	122,206	357,745
Cash and cash equivalents, beginning of year	1,859,019	1,736,813	1,379,068
Cash and cash equivalents, end of year	1,194,339	1,859,019	1,736,813
Parent Company
Cash flows (used in) provided by operating activities
Net income (loss) attributable to RenaissanceRe	(1,061,204)	(40,155)	762,405
Less: equity in net income of subsidiaries	988,610	10,670	(786,552)
Loss before equity in net income of subsidiaries	(72,594)	(29,485)	(24,147)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities
Net realized and unrealized (gains) losses on investments	2,051	4,898	4,556
Other	36,601	59,873	37,782
Net cash provided by (used in) operating activities	(33,942)	35,286	18,191
Cash flows used in investing activities
Proceeds from maturities and sales of fixed maturity investments trading	198,341	436,122	370,905
Purchases of fixed maturity investments trading	(375,804)	(421,323)	(384,415)
Net purchases of short term investments	(21,037)	78,904	64,209
Dividends and return of capital from subsidiaries	1,009,108	1,104,831	827,626
Contributions to subsidiaries	(349,336)	(351,548)	(1,623,708)
Due (to) from subsidiary	(178,470)	50,472	(65,438)
Net cash provided by (used in) investing activities	282,802	897,458	(810,821)
Cash flows provided by (used in) financing activities
Dividends paid – RenaissanceRe common shares	(64,675)	(67,828)	(68,490)
Dividends paid – preference shares	(35,396)	(32,889)	(30,923)
Issuance of debt, net of expenses	0	0	0
RenaissanceRe common share repurchases	(166,664)	(1,027,505)	(62,621)
RenaissanceRe common share issuance	0	0	1,095,507
Redemption of preference shares	0	(275,000)	(125,000)
Issuance of preference shares, net of expenses	0	488,653	0
Taxes paid on withholding shares	(10,911)	(12,171)	(12,330)
Net cash provided by (used in) financing activities	(277,646)	(926,740)	796,143
Effect of exchange rate changes on foreign currency cash	0	0	(143)
Net increase (decrease) in cash and cash equivalents	(28,786)	6,004	3,370
Cash and cash equivalents, beginning of year	35,834	29,830	26,460
Cash and cash equivalents, end of year	$ 7,048	$ 35,834	$ 29,830