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Derivative Financial Instruments (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]          
Gain on cash flow hedge due to forecasted transaction probably of not occurring $ 18.9   $ 16.1 $ 0.2  
Loss on discontinuation of cash flow hedge due to forecasted transaction probable of not occurring   $ (10.5)      
Cash flow hedges of forecasted transactions, net of tax, in accumulated OCI gain (loss) $ (29.9)   (29.9)   $ (126.9)
Cash flow hedge gain (loss) expected to be reclassified within 12 months     $ (26.2)    
Hedges maturity year     2020