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Derivative Financial Instruments (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
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  
Ineffectiveness recognized in earnings for cash flow hedges   0   0
Amount of Ineffectiveness on Net Investment Hedges   0   0
Net investment gains (losses) recognized in AOCI $ 157,700,000 $ (102,000,000) $ 83,400,000 $ (132,400,000)
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     400,000  
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     600,000  
Available for Sale 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     $ (900,000)