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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 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 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 $ 1,311,833 $ 1,417,773 4,251,465 2,680,977  
Prior years (269,710) (108,271) (465,584) (205,352)  
Total net incurred 1,042,123 1,309,502 3,785,881 2,475,625  
Net paid related to:          
Current year     678,357 100,022  
Prior years     1,598,704 1,614,571  
Total net paid     2,277,061 1,714,593  
Foreign exchange and other     281,869 (17,422)  
Reserve for claims and claim expenses, net of reinsurance recoverable, end of period 18,612,790 15,886,193 18,612,790 15,886,193  
Reinsurance recoverable, end of period 4,300,973 4,854,735 4,300,973 4,854,735 $ 4,481,390
Reserve for claims and claim expenses, end of period $ 22,913,763 $ 20,740,928 $ 22,913,763 $ 20,740,928