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Derivative Financial Instruments (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Derivative [Line Items]        
Gains or losses reclassified into earnings $ 0.0 $ 0.0 $ 0.0 $ 0.0
Maximum length of time over which exposure was being hedged     23 months  
Net investment gains (losses) recognized in AOCI $ 117.4 $ (107.6) $ 29.8 $ (144.1)
Foreign Currency Denominate        
Derivative [Line Items]        
Estimated net gain (loss) to be reclassified into net income within the next twelve months relating to cash flow hedges     (0.9)  
Foreign Currency Denominated Debt Securities        
Derivative [Line Items]        
Estimated net gain (loss) to be reclassified into net income within the next twelve months relating to cash flow hedges     16.3  
SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE        
Derivative [Line Items]        
Estimated net gain (loss) to be reclassified into net income within the next twelve months relating to cash flow hedges     $ 0.3