Noncontrolling Interests - Schedule of Redeemable Noncontrolling Interest Activity (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Activity in redeemable noncontrolling interest
Beginning balance	$ 4,535,389
Net income (loss) attributable to redeemable noncontrolling interest	1,058,995	$ (98,613)	$ (63,285)
Ending balance	6,100,831	4,535,389
DaVinci Holdings Ltd.
Activity in redeemable noncontrolling interest
Beginning balance	1,740,300	1,499,451
Redemption of shares from redeemable noncontrolling interests	(123,272)	(161,570)
Sale of shares to redeemable noncontrolling interests, net of adjustments	250,000	500,000
Net income (loss) attributable to redeemable noncontrolling interest	545,812	(65,514)	(102,932)
Ending balance	2,541,482	1,740,300	1,499,451
DaVinci Holdings Ltd. \| Third-Party Investors And RenaissanceRe
Activity in redeemable noncontrolling interest
Sale of shares to redeemable noncontrolling interests, net of adjustments	378,642	467,933
Medici
Activity in redeemable noncontrolling interest
Beginning balance	1,036,218	856,820
Redemption of shares from redeemable noncontrolling interests	(107,549)	(100,234)
Sale of shares to redeemable noncontrolling interests, net of adjustments	482,310	350,136
Net income (loss) attributable to redeemable noncontrolling interest	239,250	(70,504)	1,492
Ending balance	1,650,229	1,036,218	856,820
Vermeer Reinsurance Ltd.
Activity in redeemable noncontrolling interest
Beginning balance	1,490,840	1,197,782
Redemption of shares from redeemable noncontrolling interests	(175,000)	0
Sale of shares to redeemable noncontrolling interests, net of adjustments	0	250,000
Net income (loss) attributable to redeemable noncontrolling interest	239,457	43,058	38,155
Ending balance	1,555,297	1,490,840	1,197,782
Fontana Holdings L.P.
Activity in redeemable noncontrolling interest
Beginning balance	268,031	0
Sale of shares to redeemable noncontrolling interests, net of adjustments	51,316	273,684
Net income (loss) attributable to redeemable noncontrolling interest	34,476	(5,653)	0
Ending balance	$ 353,823	$ 268,031	$ 0

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests).

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Amount of Net Income (Loss) attributable to redeemable noncontrolling interest.

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Amount of increase in noncontrolling interest from subsidiary issuance of equity interests to noncontrolling interest holders.

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As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

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