NONCONTROLLING INTERESTS - Schedule of Redeemable Noncontrolling Interest (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Activity in redeemable noncontrolling interest
Beginning balance			$ 4,535,389,000
Net income (loss) attributable to redeemable noncontrolling interest	$ 174,907,000	$ 49,331,000	442,291,000	$ 37,419,000
Ending balance	5,676,262,000		5,676,262,000
DaVinciRe Holdings Ltd.
Activity in redeemable noncontrolling interest
Beginning balance	2,234,541,000	1,775,503,000	1,740,300,000	1,499,451,000
Redemption of shares from redeemable noncontrolling interests	(27,320,000)	(74,141,000)	(77,495,000)	(161,569,000)
Sale of shares to redeemable noncontrolling interests, net of adjustments			250,000,000	500,000,000
Net income (loss) attributable to redeemable noncontrolling interest	59,527,000	58,822,000	225,609,000	33,499,000
Ending balance	2,267,448,000	1,762,677,000	2,267,448,000	1,762,677,000
DaVinciRe Holdings Ltd. | Third-Party Investors And RenaissanceRe
Activity in redeemable noncontrolling interest
Sale of shares to redeemable noncontrolling interests, net of adjustments	700,000	2,493,000	379,034,000	391,296,000
Medici
Activity in redeemable noncontrolling interest
Beginning balance	1,307,741,000	941,912,000	1,036,218,000	856,820,000
Redemption of shares from redeemable noncontrolling interests	0	(20,204,000)	(17,648,000)	(97,112,000)
Sale of shares to redeemable noncontrolling interests, net of adjustments	170,589,000	157,739,000	414,691,000	325,026,000
Net income (loss) attributable to redeemable noncontrolling interest	62,190,000	(26,887,000)	107,259,000	(32,174,000)
Ending balance	1,540,520,000	1,052,560,000	1,540,520,000	1,052,560,000
Vermeer Reinsurance Ltd.
Activity in redeemable noncontrolling interest
Beginning balance	1,538,245,000	1,246,480,000	1,490,840,000	1,197,782,000
Sale of shares to redeemable noncontrolling interests, net of adjustments	0	0	0	30,000,000
Net income (loss) attributable to redeemable noncontrolling interest	52,163,000	22,937,000	99,568,000	41,635,000
Ending balance	1,590,408,000	1,269,417,000	1,590,408,000	1,269,417,000
Fontana
Activity in redeemable noncontrolling interest
Beginning balance	276,859,000	0	268,031,000	0
Sale of shares to redeemable noncontrolling interests, net of adjustments	0	273,684,000	0	273,684,000
Net income (loss) attributable to redeemable noncontrolling interest	1,027,000	(5,541,000)	9,855,000	(5,541,000)
Ending balance	$ 277,886,000	$ 268,143,000	$ 277,886,000	$ 268,143,000