v3.26.3
DERIVATIVE INSTRUMENTS - Schedule of Location and Amount of the Gain (Loss) Recognized (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives $ (56,511) $ 174,026 $ 4,231 $ 529,785
Derivative instruments not designated as hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives (56,147) 174,597 6,825 533,733
Derivative instruments not designated as hedges | Income Statement Location [Axis]: us-gaap:ForeignCurrencyTransactionGainLossBeforeTax        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives (5,143) (6,415) (24,556) 35,644
Derivative instruments not designated as hedges | Income Statement Location [Axis]: us-gaap:NonoperatingGainsLosses        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives (51,004) 181,012 31,381 498,089
Fixed Maturity Investment-Related Derivatives | Derivative instruments not designated as hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives (68,147) (40,510) (94,792) 91,023
Interest rate futures | Derivative instruments not designated as hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives (62,633) (33,115) (100,469) 70,780
Credit default swaps | Derivative instruments not designated as hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives (5,667) (7,395) 5,507 20,243
Interest rate swaps | Derivative instruments not designated as hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives 153 0 170 0
Equity Investment-Related Derivatives | Derivative instruments not designated as hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives 16,808 77,954 139,659 112,654
Equity futures | Derivative instruments not designated as hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives 16,808 77,954 139,659 112,654
Commodity | Derivative instruments not designated as hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives 335 143,568 (13,486) 294,412
Commodity futures | Derivative instruments not designated as hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives 335 143,568 (13,486) 297,014
Commodity options | Derivative instruments not designated as hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives 0 0 0 (2,602)
Foreign currency forward contracts | Derivative instruments not designated as hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives (10,132) (4,027) (30,936) 40,907
Foreign currency forward contracts | Derivative instruments not designated as hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives 4,989 (2,388) 6,380 (5,263)
Foreign currency forward contracts | Derivative instruments designated as hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Accumulated other comprehensive income (loss) $ (364) $ (571) $ (2,594) $ (3,948)