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NONCONTROLLING INTERESTS - Schedule of Activity in Redeemable Noncontrolling Interest (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Activity in redeemable noncontrolling interest
Beginning balance			$ 6,977,749,000
Net income (loss) attributable to redeemable noncontrolling interest	$ 328,339,000	$ 224,731,000	133,087,000	$ 469,558,000
Ending balance	7,043,107,000		7,043,107,000
DaVinci Holdings Ltd.
Activity in redeemable noncontrolling interest
Beginning balance	2,992,338,000	2,634,555,000	3,061,708,000	2,541,482,000
Redemption of shares/capital from redeemable noncontrolling interest, net of adjustments	0	(26,147,000)	(26,929,000)	(381,849,000)
Net income (loss) attributable to redeemable noncontrolling interest	218,453,000	152,511,000	106,012,000	300,524,000
Ending balance	3,210,791,000	2,760,164,000	3,210,791,000	2,760,164,000
DaVinci Holdings Ltd. | Third-Party Investors And RenaissanceRe
Activity in redeemable noncontrolling interest
Sale of shares to redeemable noncontrolling interests, net of adjustments	0	(755,000)	70,000,000	300,007,000
Medici
Activity in redeemable noncontrolling interest
Beginning balance	1,469,402,000	1,778,763,000	1,646,745,000	1,650,229,000
Redemption of shares/capital from redeemable noncontrolling interest, net of adjustments	(56,734,000)	(181,983,000)	(295,529,000)	(227,550,000)
Sale of shares and contribution of capital to/by redeemable noncontrolling interests	81,329,000	21,479,000	142,932,000	167,721,000
Net income (loss) attributable to redeemable noncontrolling interest	38,993,000	13,249,000	54,156,000	59,518,000
Dividends on common shares	0	0	(15,314,000)	(18,410,000)
Ending balance	1,532,990,000	1,631,508,000	1,532,990,000	1,631,508,000
Vermeer
Activity in redeemable noncontrolling interest
Beginning balance	1,692,777,000	1,433,268,000	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	57,425,000	56,624,000	(49,655,000)	109,595,000
Dividends on common shares	0	0	0	(175,000,000)
Ending balance	1,750,202,000	1,489,892,000	1,750,202,000	1,489,892,000
Fontana
Activity in redeemable noncontrolling interest
Beginning balance	535,656,000	451,397,000	469,439,000	353,823,000
Redemption of shares/capital from redeemable noncontrolling interest, net of adjustments	0	0	(72,044,000)	0
Sale of shares and contribution of capital to/by redeemable noncontrolling interests	0	0	129,155,000	100,000,000
Net income (loss) attributable to redeemable noncontrolling interest	13,468,000	2,347,000	22,574,000	(79,000)
Ending balance	$ 549,124,000	$ 453,744,000	$ 549,124,000	$ 453,744,000

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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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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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