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INVESTMENTS - Schedule of Fair Value of Fixed Maturity Investments Trading (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Fixed maturity investments trading $ 23,562,514 $ 20,877,108
U.S. treasuries    
Schedule of Investments [Line Items]    
Fixed maturity investments trading 11,001,893 10,060,203
Corporate    
Schedule of Investments [Line Items]    
Fixed maturity investments trading 7,862,423 6,499,075
Asset-backed    
Schedule of Investments [Line Items]    
Fixed maturity investments trading 1,422,393 1,491,695
Residential mortgage-backed    
Schedule of Investments [Line Items]    
Fixed maturity investments trading 1,707,056 1,420,362
Agencies    
Schedule of Investments [Line Items]    
Fixed maturity investments trading 623,489 489,117
Non-U.S. government    
Schedule of Investments [Line Items]    
Fixed maturity investments trading 618,809 483,576
Commercial mortgage-backed    
Schedule of Investments [Line Items]    
Fixed maturity investments trading $ 326,451 $ 433,080