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Presentation of Financial Statements (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Accounting Changes [Line Items]        
Income tax benefit $ (132.0) $ (134.3) $ (406.7) $ (417.7)
Accounting Standards Update 2016-09 [Member]        
Accounting Changes [Line Items]        
Income tax benefit     19.5  
Excess tax benefit from share-based compensation, operating activities       19.1
Excess tax benefit from share-based compensation, financing activities       $ (19.1)
Cumulative catch-up adjustment to opening retained earnings $ (4.5)   $ (4.5)