NONCONTROLLING INTERESTS - Schedule of Activity in Redeemable Noncontrolling Interest (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Activity in redeemable noncontrolling interest
Beginning balance			$ 4,535,389,000
Net income (loss) attributable to redeemable noncontrolling interest	$ 213,695,000	$ (372,429,000)	655,986,000	$ (335,010,000)
Ending balance	5,662,234,000		5,662,234,000
DaVinci
Activity in redeemable noncontrolling interest
Beginning balance	2,267,448,000	1,762,677,000	1,740,300,000	1,499,451,000
Redemption of shares from redeemable noncontrolling interests	(45,777,000)	74,983,000	(123,272,000)	(86,586,000)
Sale of shares to redeemable noncontrolling interests, net of adjustments			250,000,000	500,000,000
Net income (loss) attributable to redeemable noncontrolling interest	107,881,000	(219,191,000)	333,490,000	(185,692,000)
Ending balance	2,331,952,000	1,618,490,000	2,331,952,000	1,618,490,000
DaVinci | Third-Party Investors And RenaissanceRe
Activity in redeemable noncontrolling interest
Sale of shares to redeemable noncontrolling interests, net of adjustments	2,400,000	21,000	381,434,000	391,317,000
Medici
Activity in redeemable noncontrolling interest
Beginning balance	1,540,520,000	1,052,560,000	1,036,218,000	856,820,000
Redemption of shares from redeemable noncontrolling interests	(25,644,000)	(2,522,000)	(43,292,000)	(99,634,000)
Sale of shares to redeemable noncontrolling interests, net of adjustments	16,298,000	22,110,000	430,989,000	347,136,000
Net income (loss) attributable to redeemable noncontrolling interest	60,022,000	(107,461,000)	167,281,000	(139,635,000)
Ending balance	1,591,196,000	964,687,000	1,591,196,000	964,687,000
Vermeer
Activity in redeemable noncontrolling interest
Beginning balance	1,590,408,000	1,269,417,000	1,490,840,000	1,197,782,000
Redemption of shares from redeemable noncontrolling interests	(175,000,000)	0	(175,000,000)	0
Sale of shares to redeemable noncontrolling interests, net of adjustments	0	100,000,000	0	130,000,000
Net income (loss) attributable to redeemable noncontrolling interest	51,959,000	(39,164,000)	151,527,000	2,471,000
Ending balance	1,467,367,000	1,330,253,000	1,467,367,000	1,330,253,000
Fontana
Activity in redeemable noncontrolling interest
Beginning balance	277,886,000	268,143,000	268,031,000	0
Redemption of shares from redeemable noncontrolling interests			0
Sale of shares to redeemable noncontrolling interests, net of adjustments	0	0	0	273,684,000
Net income (loss) attributable to redeemable noncontrolling interest	(6,167,000)	(6,613,000)	3,688,000	(12,154,000)
Ending balance	$ 271,719,000	$ 261,530,000	$ 271,719,000	$ 261,530,000