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DERIVATIVE INSTRUMENTS - Narrative (Details) - Derivative instruments not designated as hedges - USD ($)
Mar. 31, 2024
Dec. 31, 2023
Interest rate futures | Long    
Derivative [Line Items]    
Notional amount $ 5,200,000,000 $ 5,900,000,000
Interest rate futures | Short    
Derivative [Line Items]    
Notional amount 2,700,000,000 2,700,000,000
Foreign currency forward contracts, underwriting and non-investment operations | Long    
Derivative [Line Items]    
Notional amount 379,800,000 805,200,000
Foreign currency forward contracts, underwriting and non-investment operations | Short    
Derivative [Line Items]    
Notional amount 384,400,000 496,400,000
Foreign currency forward contracts, investment operations | Long    
Derivative [Line Items]    
Notional amount 297,700,000 420,700,000
Foreign currency forward contracts, investment operations | Short    
Derivative [Line Items]    
Notional amount 100,200,000 130,000,000
Credit default swaps | Long    
Derivative [Line Items]    
Notional amount 1,500,000,000 1,500,000,000
Credit default swaps | Short    
Derivative [Line Items]    
Notional amount 12,500,000 22,100,000
Equity futures | Long    
Derivative [Line Items]    
Notional amount   0
Equity futures | Short    
Derivative [Line Items]    
Notional amount 0  
Commodity futures | Long    
Derivative [Line Items]    
Notional amount 374,000,000 255,200,000
Commodity options | Long    
Derivative [Line Items]    
Notional amount 44,000 400,000
Commodity options | Short    
Derivative [Line Items]    
Notional amount $ 0 $ 0