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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
Mar. 31, 2025
Mar. 31, 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 2,939,632 1,263,204  
Prior years (195,874) (97,081)  
Total net incurred 2,743,758 1,166,123  
Net paid related to:      
Current year 492,114 40,657  
Prior years 888,032 872,205  
Total net paid 1,380,146 912,862  
Foreign exchange and other 93,523 (19,914)  
Reserve for claims and claim expenses, net of reinsurance recoverable, end of period 18,279,236 15,375,930  
Reinsurance recoverable, end of period 4,577,895 4,993,680 $ 4,481,390
Reserve for claims and claim expenses, end of period $ 22,857,131 $ 20,369,610