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Derivative Instruments (Narrative) (Details) - Not Designated as Hedging Instrument - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Interest rate swaps | Paying a Fixed Rate | United States of America, Dollars    
Derivative [Line Items]    
Derivative, notional amount $ 0.0 $ 27.9
Interest rate swaps | Receiving a Fixed Rate | United States of America, Dollars    
Derivative [Line Items]    
Derivative, notional amount 23.5 25.5
Long | Interest rate futures    
Derivative [Line Items]    
Derivative, notional amount 2,000.0 2,500.0
Long | Foreign currency forward contracts    
Derivative [Line Items]    
Derivative, notional amount 661.4 1,200.0
Long | Foreign currency forward contracts    
Derivative [Line Items]    
Derivative, notional amount 269.5 195.6
Long | Credit default swaps    
Derivative [Line Items]    
Derivative, notional amount 0.0 0.5
Long | Total return swaps    
Derivative [Line Items]    
Derivative, notional amount 0.0 173.5
Long | Equity futures    
Derivative [Line Items]    
Derivative, notional amount 0.0 122.0
Short | Interest rate futures    
Derivative [Line Items]    
Derivative, notional amount 1,000.0 1,000.0
Short | Foreign currency forward contracts    
Derivative [Line Items]    
Derivative, notional amount 504.2 722.6
Short | Foreign currency forward contracts    
Derivative [Line Items]    
Derivative, notional amount 117.5 61.0
Short | Credit default swaps    
Derivative [Line Items]    
Derivative, notional amount 96.8 143.4
Short | Total return swaps    
Derivative [Line Items]    
Derivative, notional amount 0.0 0.0
Short | Equity futures    
Derivative [Line Items]    
Derivative, notional amount $ 0.0 $ 0.0