Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows provided by (used in) operating activities
Net income (loss)	$ (1,159,816)	$ (103,440)	$ 993,058
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities
Amortization, accretion and depreciation	(26,950)	(20,989)	16,652
Equity in undistributed (earnings) losses of other ventures	10,723	13,200	1,561
Net realized and unrealized (gains) losses on investments	1,635,192	205,897	(820,636)
Loss on sale of RenaissanceRe UK	0	0	30,242
Change in:
Premiums receivable	(1,357,929)	(886,911)	(293,581)
Prepaid reinsurance premiums	(166,690)	(31,140)	(55,801)
Reinsurance recoverable	(442,256)	(1,342,659)	(138,361)
Deferred acquisition costs	(322,578)	(215,639)	30,442
Reserve for claims and claim expenses	2,597,943	2,913,492	1,155,615
Unearned premiums	1,027,894	767,614	232,949
Reinsurance balances payable	67,318	372,611	662,281
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 provided by (used in) investing activities
Proceeds from sales and maturities 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 sales (purchases) of equity investments	(202,309)	206,595	829
Net sales (purchases) of short term investments	640,411	(252,833)	(581,473)
Net sales (purchases) of other investments	(618,790)	(617,782)	(216,760)
Net sales (purchases) of investments in other ventures	(773)	(23,835)	(3,698)
Return of investment from investment in other ventures	2,248	8,345	9,255
Net proceeds from sale of RenaissanceRe UK	0	0	136,744
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
Repayment of debt	0	0	(250,000)
Drawdown of Medici Revolving Credit Facility	0	30,000	0
Redemption of preference shares	0	(275,000)	(125,000)
Issuance of preference shares, net of expenses	0	488,653	0
Net third-party redeemable noncontrolling interest share transactions	1,002,988	594,279	119,071
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
Supplemental disclosure of cash flow information
Income taxes paid (refunded)	3,129	(4,261)	5,668
Interest paid	$ 46,247	$ 21,172	$ 48,805