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DERIVATIVE INSTRUMENTS - Narrative (Details) - Derivative instruments not designated as hedges - USD ($)
Jun. 30, 2025
Dec. 31, 2024
Interest rate futures | Long    
Derivative [Line Items]    
Derivative, notional amount $ 7,200,000,000 $ 7,100,000,000
Interest rate futures | Short    
Derivative [Line Items]    
Derivative, notional amount 3,300,000,000 3,100,000,000
Foreign currency forward contracts, underwriting and non-investment operations | Long    
Derivative [Line Items]    
Derivative, notional amount 794,600,000 1,000,000,000.0
Foreign currency forward contracts, underwriting and non-investment operations | Short    
Derivative [Line Items]    
Derivative, notional amount 178,500,000 508,800,000
Foreign currency forward contracts, investment operations | Long    
Derivative [Line Items]    
Derivative, notional amount 425,600,000 345,000,000.0
Foreign currency forward contracts, investment operations | Short    
Derivative [Line Items]    
Derivative, notional amount 108,200,000 107,000,000.0
Credit default swaps | Long    
Derivative [Line Items]    
Derivative, notional amount 343,000,000.0 1,400,000,000
Equity futures | Long    
Derivative [Line Items]    
Derivative, notional amount 1,100,000,000 437,200,000
Commodity futures | Long    
Derivative [Line Items]    
Derivative, notional amount 899,700,000 684,300,000
Commodity options | Long    
Derivative [Line Items]    
Derivative, notional amount $ 0 $ 500,000