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Derivative Instruments (Narrative) (Details) - Not Designated as Hedging Instrument - USD ($)
Mar. 31, 2022
Dec. 31, 2021
Interest rate futures | Long    
Derivative [Line Items]    
Notional amount $ 1,300,000,000 $ 2,200,000,000
Interest rate futures | Short    
Derivative [Line Items]    
Notional amount 500,000,000 500,000,000
Interest rate swaps | US Dollars | Paying a Fixed Rate    
Derivative [Line Items]    
Notional amount 0 0
Interest rate swaps | US Dollars | Receiving a Fixed Rate    
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 270,700,000 329,300,000
Foreign currency forward contracts, investment operations | Long    
Derivative [Line Items]    
Notional amount 244,100,000 245,800,000
Foreign currency forward contracts, investment operations | Short    
Derivative [Line Items]    
Notional amount 124,700,000 131,000,000
Credit default swaps | Long    
Derivative [Line Items]    
Notional amount 0  
Credit default swaps | Short    
Derivative [Line Items]    
Notional amount 124,200,000 218,500,000
Total return swaps | Long    
Derivative [Line Items]    
Notional amount 0 0
Equity futures | Long    
Derivative [Line Items]    
Notional amount $ 290,600,000 $ 74,300,000