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Derivative Instruments (Narrative) (Details) - Not Designated as Hedging Instrument - USD ($)
Jun. 30, 2021
Dec. 31, 2020
Interest rate futures | Long    
Derivative [Line Items]    
Notional amount $ 1,500,000,000 $ 2,000,000,000.0
Interest rate futures | Short    
Derivative [Line Items]    
Notional amount 700,000,000 1,000,000,000.0
Interest rate swaps | US Dollars | Receiving a Fixed Rate    
Derivative [Line Items]    
Notional amount 39,000,000.0 23,500,000
Foreign currency forward contracts, underwriting and non-investment operations | Long    
Derivative [Line Items]    
Notional amount 707,600,000 661,400,000
Foreign currency forward contracts, underwriting and non-investment operations | Short    
Derivative [Line Items]    
Notional amount 309,800,000 504,200,000
Foreign currency forward contracts, investment operations | Long    
Derivative [Line Items]    
Notional amount 273,000,000.0 269,500,000
Foreign currency forward contracts, investment operations | Short    
Derivative [Line Items]    
Notional amount 108,600,000 117,500,000
Credit default swaps | Long    
Derivative [Line Items]    
Notional amount 50,500,000 0
Credit default swaps | Short    
Derivative [Line Items]    
Notional amount 59,100,000 96,800,000
Total return swaps | Long    
Derivative [Line Items]    
Notional amount 50,000,000.0 0
Equity futures    
Derivative [Line Items]    
Notional amount $ 0 $ 0