v3.26.1
NONCONTROLLING INTERESTS - Schedule of Activity in Redeemable Noncontrolling Interest (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Activity in redeemable noncontrolling interest        
Beginning balance     $ 7,602,092,000  
Net income (loss) attributable to redeemable noncontrolling interest $ 315,260,000 $ 328,339,000 537,711,000 $ 133,087,000
Ending balance 7,343,353,000   7,343,353,000  
Variable Interest Entity, Primary Beneficiary        
Activity in redeemable noncontrolling interest        
Beginning balance     7,602,092,000  
Net income (loss) attributable to redeemable noncontrolling interest 315,260,000 328,339,000 537,711,000 133,087,000
Ending balance 7,343,353,000   7,343,353,000  
DaVinciRe Holdings Ltd. | Variable Interest Entity, Primary Beneficiary        
Activity in redeemable noncontrolling interest        
Beginning balance 3,291,360,000 2,992,338,000 3,701,637,000 3,061,708,000
Redemption of shares from redeemable noncontrolling interests, net of adjustments 0 0 (649,164,000) (26,929,000)
Sale of shares to redeemable noncontrolling interests, net of adjustments 0 0 0 70,000,000
Net income (loss) attributable to redeemable noncontrolling interest, net of consolidation adjustments 205,117,000 218,453,000 444,004,000 106,012,000
Net income (loss) attributable to redeemable noncontrolling interest 205,117,000 218,453,000 362,017,000 106,012,000
Ending balance 3,496,477,000 3,210,791,000 3,496,477,000 3,210,791,000
Medici | Variable Interest Entity, Primary Beneficiary        
Activity in redeemable noncontrolling interest        
Beginning balance 1,433,068,000 1,469,402,000 1,398,166,000 1,646,745,000
Redemption of shares from redeemable noncontrolling interests, net of adjustments (15,031,000) (56,734,000) (45,936,000) (295,529,000)
Sale of shares to redeemable noncontrolling interests, net of adjustments 0 81,329,000 46,000,000 142,932,000
Net income (loss) attributable to redeemable noncontrolling interest 26,313,000 38,993,000 46,120,000 54,156,000
Dividends on common shares 0 0 0 (15,314,000)
Ending balance 1,444,350,000 1,532,990,000 1,444,350,000 1,532,990,000
Vermeer | Variable Interest Entity, Primary Beneficiary        
Activity in redeemable noncontrolling interest        
Beginning balance 1,824,130,000 1,692,777,000 1,922,431,000 1,799,857,000
Sale of shares to redeemable noncontrolling interests, net of adjustments     0 0
Net income (loss) attributable to redeemable noncontrolling interest 64,783,000 57,425,000 116,482,000 (49,655,000)
Dividends on common shares 0 0 (150,000,000) 0
Ending balance 1,888,913,000 1,750,202,000 1,888,913,000 1,750,202,000
Fontana | Variable Interest Entity, Primary Beneficiary        
Activity in redeemable noncontrolling interest        
Beginning balance 494,566,000 535,656,000 579,858,000 469,439,000
Redemption of shares from redeemable noncontrolling interests, net of adjustments 0 0 (79,337,000) (72,044,000)
Sale of shares to redeemable noncontrolling interests, net of adjustments 0 0 0 129,155,000
Net income (loss) attributable to redeemable noncontrolling interest 19,047,000 13,468,000 13,092,000 22,574,000
Ending balance $ 513,613,000 $ 549,124,000 $ 513,613,000 $ 549,124,000