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Derivative Instruments (Narrative) (Details) - Not Designated as Hedging Instrument - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Interest rate futures | Long    
Derivative [Line Items]    
Notional amount $ 1,800,000,000 $ 2,000,000,000.0
Interest rate futures | Short    
Derivative [Line Items]    
Notional amount 900,000,000 1,000,000,000.0
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 20,200,000 23,500,000
Foreign currency forward contracts, underwriting and non-investment operations | Long    
Derivative [Line Items]    
Notional amount 843,300,000 661,400,000
Foreign currency forward contracts, underwriting and non-investment operations | Short    
Derivative [Line Items]    
Notional amount 355,600,000 504,200,000
Foreign currency forward contracts, investment operations | Long    
Derivative [Line Items]    
Notional amount 265,500,000 269,500,000
Foreign currency forward contracts, investment operations | Short    
Derivative [Line Items]    
Notional amount 139,300,000 117,500,000
Credit default swaps | Long    
Derivative [Line Items]    
Notional amount 25,000,000.0 0
Credit default swaps | Short    
Derivative [Line Items]    
Notional amount 77,900,000 96,800,000
Total return swaps    
Derivative [Line Items]    
Notional amount 0 0
Equity futures    
Derivative [Line Items]    
Notional amount $ 0 $ 0