v3.26.3
NONCONTROLLING INTERESTS - Schedule of Noncontrolling Interests (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Jun. 30, 2026
Jan. 01, 2026
Dec. 31, 2025
Jun. 30, 2025
Dec. 31, 2024
Redeemable Noncontrolling Interest [Line Items]                  
Redeemable noncontrolling interests $ 7,433,760,000   $ 7,433,760,000       $ 7,602,092,000    
Net income (loss) attributable to redeemable noncontrolling interest 150,700,000 $ 415,200,000 688,411,000 $ 548,287,000          
Variable Interest Entity, Primary Beneficiary                  
Redeemable Noncontrolling Interest [Line Items]                  
Redeemable noncontrolling interests 7,433,760,000   7,433,760,000       7,602,092,000    
Net income (loss) attributable to redeemable noncontrolling interest 150,700,000 415,200,000 688,411,000 548,287,000          
DaVinciRe Holdings Ltd. | Variable Interest Entity, Primary Beneficiary                  
Redeemable Noncontrolling Interest [Line Items]                  
Redeemable noncontrolling interests 3,572,046,000 3,454,255,000 3,572,046,000 3,454,255,000 $ 3,496,477,000   3,701,637,000 $ 3,210,791,000 $ 3,061,708,000
Net income (loss) attributable to redeemable noncontrolling interest 75,569,000 243,464,000 437,586,000 349,476,000          
DaVinciRe Holdings Ltd. | Variable Interest Entity, Primary Beneficiary | Third-Party Investors                  
Redeemable Noncontrolling Interest [Line Items]                  
Redeemable noncontrolling interests 3,500,000,000   3,500,000,000       3,700,000,000    
Consolidated adjusted, amount 114,800,000   114,800,000     $ 84,800,000 0    
Net income (loss) attributable to redeemable noncontrolling interest 10,500,000 0 30,000,000.0 0          
Vermeer | Variable Interest Entity, Primary Beneficiary                  
Redeemable Noncontrolling Interest [Line Items]                  
Redeemable noncontrolling interests 1,940,347,000 1,821,183,000 1,940,347,000 1,821,183,000 1,888,913,000   1,922,431,000 1,750,202,000 1,799,857,000
Net income (loss) attributable to redeemable noncontrolling interest 51,434,000 70,981,000 167,916,000 21,326,000          
Medici | Variable Interest Entity, Primary Beneficiary                  
Redeemable Noncontrolling Interest [Line Items]                  
Redeemable noncontrolling interests 1,512,633,000 1,623,315,000 1,512,633,000 1,623,315,000 1,444,350,000   1,398,166,000 1,532,990,000 1,646,745,000
Net income (loss) attributable to redeemable noncontrolling interest 67,021,000 79,573,000 113,141,000 133,729,000          
Fontana | Variable Interest Entity, Primary Beneficiary                  
Redeemable Noncontrolling Interest [Line Items]                  
Redeemable noncontrolling interests 408,734,000 570,306,000 408,734,000 570,306,000 $ 513,613,000   $ 579,858,000 $ 549,124,000 $ 469,439,000
Net income (loss) attributable to redeemable noncontrolling interest $ (43,324,000) $ 21,182,000 $ (30,232,000) $ 43,756,000