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NONCONTROLLING INTERESTS - Schedule of Activity in Redeemable Noncontrolling Interest (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Activity in redeemable noncontrolling interest
Beginning balance			$ 6,977,749,000
Net income (loss) attributable to redeemable noncontrolling interest	$ 415,200,000	$ 450,176,000	548,287,000	$ 919,734,000
Ending balance	7,469,059,000		7,469,059,000
Variable Interest Entity, Primary Beneficiary
Activity in redeemable noncontrolling interest
Beginning balance			6,977,749,000
Net income (loss) attributable to redeemable noncontrolling interest	415,200,000	450,176,000	548,287,000	919,734,000
Ending balance	7,469,059,000		7,469,059,000
DaVinciRe Holdings Ltd. | Variable Interest Entity, Primary Beneficiary
Activity in redeemable noncontrolling interest
Beginning balance	3,210,791,000	2,760,164,000	3,061,708,000	2,541,482,000
Redemption of shares/capital from redeemable noncontrolling interest, net of adjustments	0	(25,000,000)	(26,929,000)	(406,849,000)
Sale of shares to redeemable noncontrolling interests, net of adjustments	0	0	70,000,000	300,007,000
Net income (loss) attributable to redeemable noncontrolling interest	243,464,000	223,288,000	349,476,000	523,812,000
Ending balance	3,454,255,000	2,958,452,000	3,454,255,000	2,958,452,000
Medici | Variable Interest Entity, Primary Beneficiary
Activity in redeemable noncontrolling interest
Beginning balance	1,532,990,000	1,631,508,000	1,646,745,000	1,650,229,000
Redemption of shares/capital from redeemable noncontrolling interest, net of adjustments	(7,143,000)	(83,614,000)	(302,672,000)	(311,164,000)
Sale of shares and contribution of capital to/by redeemable noncontrolling interests	17,895,000	15,319,000	160,827,000	183,040,000
Net income (loss) attributable to redeemable noncontrolling interest	79,573,000	123,497,000	133,729,000	183,015,000
Dividends on common shares	0	(6,190,000)	(15,314,000)	(24,600,000)
Ending balance	1,623,315,000	1,680,520,000	1,623,315,000	1,680,520,000
Vermeer | Variable Interest Entity, Primary Beneficiary
Activity in redeemable noncontrolling interest
Beginning balance	1,750,202,000	1,489,892,000	1,799,857,000	1,555,297,000
Sale of shares and contribution of capital to/by redeemable noncontrolling interests	0	175,000,000	0	175,000,000
Net income (loss) attributable to redeemable noncontrolling interest	70,981,000	73,534,000	21,326,000	183,129,000
Dividends on common shares	0	0	0	(175,000,000)
Ending balance	1,821,183,000	1,738,426,000	1,821,183,000	1,738,426,000
Fontana | Variable Interest Entity, Primary Beneficiary
Activity in redeemable noncontrolling interest
Beginning balance	549,124,000	453,744,000	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	21,182,000	29,857,000	43,756,000	29,778,000
Ending balance	$ 570,306,000	$ 483,601,000	$ 570,306,000	$ 483,601,000

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Noncontrolling Interest, Increase From Subsidiary Equity Issuance, Net

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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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