v3.26.3
INVESTMENTS - Schedule of Net Realized and Unrealized Gains (Losses) on Investments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Gain (Loss) on Securities [Line Items]        
Net realized and unrealized gains (losses) on investments $ (879,843) $ 311,890 $ (1,180,128) $ 994,550
Fixed maturity investments trading        
Gain (Loss) on Securities [Line Items]        
Fixed maturity investments trading (831,471) 86,089 (1,188,115) 416,943
Fixed maturity investments trading | Derivative instruments not designated as hedges        
Gain (Loss) on Securities [Line Items]        
Net realized and unrealized gains (losses) on investment-related derivatives (68,100) (40,500) (94,800) 91,000
Investment-related derivatives        
Gain (Loss) on Securities [Line Items]        
Net realized and unrealized gains (losses) on investment-related derivatives (51,004) 181,012 31,381 498,089
Equity investments        
Gain (Loss) on Securities [Line Items]        
Equity investments (78,966) 7,150 (131,951) 33,979
Equity investments | Derivative instruments not designated as hedges        
Gain (Loss) on Securities [Line Items]        
Net realized and unrealized gains (losses) on investment-related derivatives 16,800 78,000 139,700 112,700
Catastrophe bonds        
Gain (Loss) on Securities [Line Items]        
Net realized and unrealized gains (losses) on other investments 34,971 44,592 22,017 (9,837)
Fund and direct private equity investments        
Gain (Loss) on Securities [Line Items]        
Net realized and unrealized gains (losses) on other investments 46,627 (6,953) 86,540 55,376
Commodity | Derivative instruments not designated as hedges        
Gain (Loss) on Securities [Line Items]        
Net realized and unrealized gains (losses) on investment-related derivatives $ 300 $ 143,600 $ (13,500) $ 294,400