NONCONTROLLING INTERESTS - Schedule of Noncontrolling Interests (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Redeemable Noncontrolling Interest [Line Items]
Redeemable noncontrolling interests	$ 5,676,262		$ 5,676,262			$ 4,535,389
Net income (loss) attributable to redeemable noncontrolling interest	174,907	$ 49,331	442,291	$ 37,419
DaVinciRe Holdings Ltd.
Redeemable Noncontrolling Interest [Line Items]
Redeemable noncontrolling interests	2,267,448	1,762,677	2,267,448	1,762,677	$ 2,234,541	1,740,300	$ 1,775,503	$ 1,499,451
Net income (loss) attributable to redeemable noncontrolling interest	59,527	58,822	225,609	33,499
Medici
Redeemable Noncontrolling Interest [Line Items]
Redeemable noncontrolling interests	1,540,520	1,052,560	1,540,520	1,052,560	1,307,741	1,036,218	941,912	856,820
Net income (loss) attributable to redeemable noncontrolling interest	62,190	(26,887)	107,259	(32,174)
Vermeer Reinsurance Ltd.
Redeemable Noncontrolling Interest [Line Items]
Redeemable noncontrolling interests	1,590,408	1,269,417	1,590,408	1,269,417	1,538,245	1,490,840	1,246,480	1,197,782
Net income (loss) attributable to redeemable noncontrolling interest	52,163	22,937	99,568	41,635
Fontana
Redeemable Noncontrolling Interest [Line Items]
Redeemable noncontrolling interests	277,886	268,143	277,886	268,143	$ 276,859	$ 268,031	$ 0	$ 0
Net income (loss) attributable to redeemable noncontrolling interest	$ 1,027	$ (5,541)	$ 9,855	$ (5,541)