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Derivative Instruments (Narrative) (Details) - Not Designated as Hedging Instrument - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Interest rate swaps | Paying a Fixed Rate | United States of America, Dollars    
Derivative [Line Items]    
Derivative, notional amount $ 0 $ 0
Interest rate swaps | Receiving a Fixed Rate | United States of America, Dollars    
Derivative [Line Items]    
Derivative, notional amount 0 23,500,000
Total return swaps    
Derivative [Line Items]    
Derivative, notional amount 0 0
Long | Interest rate futures    
Derivative [Line Items]    
Derivative, notional amount 2,200,000,000 2,000,000,000
Long | Foreign currency forward contracts    
Derivative [Line Items]    
Derivative, notional amount 915,000,000 700,000,000
Long | Foreign currency forward contracts    
Derivative [Line Items]    
Derivative, notional amount 245,800,000 269,500,000
Long | Credit default swaps    
Derivative [Line Items]    
Derivative, notional amount 0 0
Long | Equity futures    
Derivative [Line Items]    
Derivative, notional amount 74,300,000 0
Short | Interest rate futures    
Derivative [Line Items]    
Derivative, notional amount 500,000,000 1,000,000,000
Short | Foreign currency forward contracts    
Derivative [Line Items]    
Derivative, notional amount 329,300,000 504,200,000
Short | Foreign currency forward contracts    
Derivative [Line Items]    
Derivative, notional amount 131,000,000 117,500,000
Short | Credit default swaps    
Derivative [Line Items]    
Derivative, notional amount $ 218,500,000 $ 96,800,000