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DERIVATIVE INSTRUMENTS - Narrative (Details) - Derivative instruments not designated as hedges - USD ($)
Jun. 30, 2024
Dec. 31, 2023
Interest rate futures | Long    
Derivative [Line Items]    
Notional amount $ 6,800,000,000 $ 5,900,000,000
Interest rate futures | Short    
Derivative [Line Items]    
Notional amount 2,400,000,000 2,700,000,000
Foreign currency forward contracts, underwriting and non-investment operations | Long    
Derivative [Line Items]    
Notional amount 636,200,000 805,200,000
Foreign currency forward contracts, underwriting and non-investment operations | Short    
Derivative [Line Items]    
Notional amount 310,800,000 496,400,000
Foreign currency forward contracts, investment operations | Long    
Derivative [Line Items]    
Notional amount 279,800,000 420,700,000
Foreign currency forward contracts, investment operations | Short    
Derivative [Line Items]    
Notional amount 102,400,000 130,000,000.0
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 19,300,000 22,100,000
Equity futures | Long    
Derivative [Line Items]    
Notional amount 0 0
Commodity futures | Long    
Derivative [Line Items]    
Notional amount 486,200,000 255,200,000
Commodity options | Long    
Derivative [Line Items]    
Notional amount $ 300,000 $ 400,000