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NONCONTROLLING INTERESTS - Schedule of Noncontrolling Interests (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Jun. 30, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Dec. 31, 2023
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |
Redeemable noncontrolling interests | $ 7,469,059 |  | $ 7,469,059 |  |  | $ 6,977,749 |  |
Net income (loss) attributable to redeemable noncontrolling interest | 415,200 | $ 450,176 | 548,287 | $ 919,734 |  |  |  |
Variable Interest Entity, Primary Beneficiary |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |
Redeemable noncontrolling interests | 7,469,059 |  | 7,469,059 |  |  | 6,977,749 |  |
Net income (loss) attributable to redeemable noncontrolling interest | 415,200 | 450,176 | 548,287 | 919,734 |  |  |  |
DaVinciRe Holdings Ltd. | Variable Interest Entity, Primary Beneficiary |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |
Redeemable noncontrolling interests | 3,454,255 | 2,958,452 | 3,454,255 | 2,958,452 | $ 3,210,791 | 3,061,708 | $ 2,760,164 | $ 2,541,482
Net income (loss) attributable to redeemable noncontrolling interest | 243,464 | 223,288 | 349,476 | 523,812 |  |  |  |
Medici | Variable Interest Entity, Primary Beneficiary |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |
Redeemable noncontrolling interests | 1,623,315 | 1,680,520 | 1,623,315 | 1,680,520 | 1,532,990 | 1,646,745 | 1,631,508 | 1,650,229
Net income (loss) attributable to redeemable noncontrolling interest | 79,573 | 123,497 | 133,729 | 183,015 |  |  |  |
Vermeer | Variable Interest Entity, Primary Beneficiary |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |
Redeemable noncontrolling interests | 1,821,183 | 1,738,426 | 1,821,183 | 1,738,426 | 1,750,202 | 1,799,857 | 1,489,892 | 1,555,297
Net income (loss) attributable to redeemable noncontrolling interest | 70,981 | 73,534 | 21,326 | 183,129 |  |  |  |
Fontana | Variable Interest Entity, Primary Beneficiary |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |
Redeemable noncontrolling interests | 570,306 | 483,601 | 570,306 | 483,601 | $ 549,124 | $ 469,439 | $ 453,744 | $ 353,823
Net income (loss) attributable to redeemable noncontrolling interest | $ 21,182 | $ 29,857 | $ 43,756 | $ 29,778 |  |  |  |

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