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RESERVE FOR CLAIMS AND CLAIM EXPENSES - Schedule of Liability for Unpaid Claims and Claim Expenses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Reserve for claims and claim expenses, net of reinsurance recoverable, beginning of period $ 15,142,583 $ 11,181,648 $ 9,025,961
Net incurred related to:      
Current year 6,184,315 4,024,116 4,586,422
Prior years (851,334) (450,607) (247,582)
Total net incurred 5,332,981 3,573,509 4,338,840
Net paid related to:      
Current year 488,450 364,793 105,885
Prior years 3,109,360 2,630,885 1,924,271
Total net paid 3,597,810 2,995,678 2,030,156
Foreign exchange and other (55,653) 62,902 (152,997)
Amounts acquired 0 3,320,202 0
Reserve for claims and claim expenses, net of reinsurance recoverable, end of period 16,822,101 15,142,583 11,181,648
Reinsurance recoverable, end of period 4,481,390 5,344,286 4,710,925
Reserve for claims and claim expenses, end of period $ 21,303,491 $ 20,486,869 $ 15,892,573