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Derivative Financial Instruments (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 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 $ (55.0) $ 7.9 $ 87.7 $ 36.5
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     0.6  
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     (19.5)  
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     $ 0.4