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Derivative Instruments - Narrative (Details) - Derivative instruments not designated as hedges - USD ($)
Jun. 30, 2022
Dec. 31, 2021
Jun. 30, 2021
Interest rate futures | Long      
Derivative [Line Items]      
Notional amount $ 1,600,000,000 $ 2,200,000,000  
Interest rate futures | Short      
Derivative [Line Items]      
Notional amount 600,000,000 500,000,000  
Interest rate swaps      
Derivative [Line Items]      
Notional amount   0 $ 0
Foreign currency forward contracts, underwriting and non-investment operations | Long      
Derivative [Line Items]      
Notional amount 1,100,000,000 915,000,000  
Foreign currency forward contracts, underwriting and non-investment operations | Short      
Derivative [Line Items]      
Notional amount 727,500,000 329,300,000  
Foreign currency option contracts | Long      
Derivative [Line Items]      
Notional amount 34,600,000 0  
Foreign currency forward contracts, investment operations | Long      
Derivative [Line Items]      
Notional amount 232,400,000 245,800,000  
Foreign currency forward contracts, investment operations | Short      
Derivative [Line Items]      
Notional amount 87,300,000 131,000,000  
Credit default swaps | Long      
Derivative [Line Items]      
Notional amount 3,400,000 0  
Credit default swaps | Short      
Derivative [Line Items]      
Notional amount 2,700,000 218,500,000  
Total return swaps | Long      
Derivative [Line Items]      
Notional amount 0 0  
Equity futures | Long      
Derivative [Line Items]      
Notional amount $ 328,700,000 $ 74,300,000