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Derivative Financial Instruments (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Derivative [Line Items]        
Gains or losses reclassified into earnings $ 0 $ 0 $ 0 $ 0
Maximum length of time over which exposure was being hedged     23 months  
Net investment gains (losses) recognized in AOCI $ (12,100,000) $ (55,000,000.0) $ 70,600,000 $ 87,700,000
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     (6,000,000.0)  
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     $ 72,000,000.0