v3.26.3
NONCONTROLLING INTERESTS - Schedule of Activity in Redeemable Noncontrolling Interest (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Activity in redeemable noncontrolling interest        
Beginning balance     $ 7,602,092,000  
Net income (loss) attributable to redeemable noncontrolling interest $ 150,700,000 $ 415,200,000 688,411,000 $ 548,287,000
Ending balance 7,433,760,000   7,433,760,000  
Variable Interest Entity, Primary Beneficiary        
Activity in redeemable noncontrolling interest        
Beginning balance     7,602,092,000  
Net income (loss) attributable to redeemable noncontrolling interest 150,700,000 415,200,000 688,411,000 548,287,000
Ending balance 7,433,760,000   7,433,760,000  
DaVinciRe Holdings Ltd. | Variable Interest Entity, Primary Beneficiary        
Activity in redeemable noncontrolling interest        
Beginning balance 3,496,477,000 3,210,791,000 3,701,637,000 3,061,708,000
Redemption of shares from redeemable noncontrolling interest, net of adjustments 0 0 (649,164,000) (26,929,000)
Sale of shares to redeemable noncontrolling interest, net of adjustments 0 0 0 70,000,000
Net income (loss) attributable to redeemable noncontrolling interest, net of consolidation adjustments 75,569,000 243,464,000 519,573,000 349,476,000
Net income (loss) attributable to redeemable noncontrolling interest 75,569,000 243,464,000 437,586,000 349,476,000
Ending balance 3,572,046,000 3,454,255,000 3,572,046,000 3,454,255,000
Vermeer | Variable Interest Entity, Primary Beneficiary        
Activity in redeemable noncontrolling interest        
Beginning balance 1,888,913,000 1,750,202,000 1,922,431,000 1,799,857,000
Sale of shares to redeemable noncontrolling interest, net of adjustments     0 0
Net income (loss) attributable to redeemable noncontrolling interest 51,434,000 70,981,000 167,916,000 21,326,000
Dividends on common shares 0 0 (150,000,000) 0
Ending balance 1,940,347,000 1,821,183,000 1,940,347,000 1,821,183,000
Medici | Variable Interest Entity, Primary Beneficiary        
Activity in redeemable noncontrolling interest        
Beginning balance 1,444,350,000 1,532,990,000 1,398,166,000 1,646,745,000
Redemption of shares from redeemable noncontrolling interest, net of adjustments (1,338,000) (7,143,000) (47,274,000) (302,672,000)
Sale of shares to redeemable noncontrolling interest, net of adjustments 2,600,000 17,895,000 48,600,000 160,827,000
Net income (loss) attributable to redeemable noncontrolling interest 67,021,000 79,573,000 113,141,000 133,729,000
Dividends on common shares 0 0 0 (15,314,000)
Ending balance 1,512,633,000 1,623,315,000 1,512,633,000 1,623,315,000
Fontana | Variable Interest Entity, Primary Beneficiary        
Activity in redeemable noncontrolling interest        
Beginning balance 513,613,000 549,124,000 579,858,000 469,439,000
Redemption of shares from redeemable noncontrolling interest, net of adjustments (61,555,000) 0 (140,892,000) (72,044,000)
Sale of shares to redeemable noncontrolling interest, net of adjustments 0 0 0 129,155,000
Net income (loss) attributable to redeemable noncontrolling interest (43,324,000) 21,182,000 (30,232,000) 43,756,000
Ending balance $ 408,734,000 $ 570,306,000 $ 408,734,000 $ 570,306,000