NONCONTROLLING INTERESTS - Schedule of Activity in Redeemable Noncontrolling Interest (Details) - USD ($)	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Activity in redeemable noncontrolling interest
Beginning balance	$ 6,977,749,000
Net income (loss) attributable to redeemable noncontrolling interest	(195,252,000)	$ 244,827,000
Ending balance	6,690,173,000
DaVinci Holdings Ltd.
Activity in redeemable noncontrolling interest
Beginning balance	3,061,708,000	2,541,482,000
Redemption of shares/capital from redeemable noncontrolling interest, net of adjustments	(26,929,000)	(355,702,000)
Net income (loss) attributable to redeemable noncontrolling interest	(112,441,000)	148,013,000
Ending balance	2,992,338,000	2,634,555,000
DaVinci Holdings Ltd. \| Third-Party Investors And RenaissanceRe
Activity in redeemable noncontrolling interest
Sale of shares to redeemable noncontrolling interests, net of adjustments	70,000,000	300,762,000
Medici
Activity in redeemable noncontrolling interest
Beginning balance	1,646,745,000	1,650,229,000
Redemption of shares/capital from redeemable noncontrolling interest, net of adjustments	(238,795,000)	(45,567,000)
Sale of shares and contribution of capital to/by redeemable noncontrolling interests	61,603,000	146,242,000
Net income (loss) attributable to redeemable noncontrolling interest	15,163,000	46,269,000
Dividends on common shares	(15,314,000)	(18,410,000)
Ending balance	1,469,402,000	1,778,763,000
Vermeer
Activity in redeemable noncontrolling interest
Beginning balance	1,799,857,000	1,555,297,000
Sale of shares and contribution of capital to/by redeemable noncontrolling interests	0
Net income (loss) attributable to redeemable noncontrolling interest	(107,080,000)	52,971,000
Dividends on common shares	0	(175,000,000)
Ending balance	1,692,777,000	1,433,268,000
Fontana
Activity in redeemable noncontrolling interest
Beginning balance	469,439,000	353,823,000
Redemption of shares/capital from redeemable noncontrolling interest, net of adjustments	(72,044,000)	0
Sale of shares and contribution of capital to/by redeemable noncontrolling interests	129,155,000	100,000,000
Net income (loss) attributable to redeemable noncontrolling interest	9,106,000	(2,426,000)
Ending balance	$ 535,656,000	$ 451,397,000

Noncontrolling Interest, Increase From Subsidiary Equity Issuance, Net

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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 balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders.

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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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