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INVESTMENTS - Schedule of Fair Value of Fixed Maturity Investments Trading (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Schedule of Investments [Line Items]    
Total fixed maturity investments trading $ 23,332,063 $ 23,562,514
U.S. treasuries    
Schedule of Investments [Line Items]    
Total fixed maturity investments trading 10,823,622 11,001,893
Corporate    
Schedule of Investments [Line Items]    
Total fixed maturity investments trading 8,101,393 7,862,423
Asset-backed    
Schedule of Investments [Line Items]    
Total fixed maturity investments trading 1,454,458 1,422,393
Residential mortgage-backed    
Schedule of Investments [Line Items]    
Total fixed maturity investments trading 1,378,022 1,707,056
Agencies    
Schedule of Investments [Line Items]    
Total fixed maturity investments trading 581,653 623,489
Non-U.S. government    
Schedule of Investments [Line Items]    
Total fixed maturity investments trading 698,646 618,809
Commercial mortgage-backed    
Schedule of Investments [Line Items]    
Total fixed maturity investments trading $ 294,269 $ 326,451