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RESERVE FOR CLAIMS AND CLAIM EXPENSES - Schedule of Liability for Unpaid Claims and Claim Expenses (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]          
Reserve for claims and claim expenses, net of reinsurance recoverable, beginning of period     $ 16,822,101 $ 15,142,583  
Net incurred related to:          
Current year $ 1,258,871 $ 1,666,120 5,510,336 4,347,097  
Prior years (380,051) (292,506) (845,635) (497,858)  
Total net incurred 878,820 1,373,614 4,664,701 3,849,239  
Net paid related to:          
Current year     763,095 252,103  
Prior years     2,373,183 2,336,002  
Total net paid     3,136,278 2,588,105  
Foreign exchange and other     277,243 78,840  
Reserve for claims and claim expenses, net of reinsurance recoverable, end of period 18,627,767 16,482,557 18,627,767 16,482,557  
Reinsurance recoverable, end of period 4,085,093 4,738,637 4,085,093 4,738,637 $ 4,481,390
Reserve for claims and claim expenses, end of period $ 22,712,860 $ 21,221,194 $ 22,712,860 $ 21,221,194