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Presentation of Financial Statements Presentation of Financial Statements (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Accounting Changes [Line Items]    
Income tax benefit $ (108.0) $ (115.5)
Accounting Standards Update 2016-09 [Member]    
Accounting Changes [Line Items]    
Income tax benefit 12.4  
Excess tax benefit from share-based compensation, operating activities   7.2
Excess tax benefit from share-based compensation, financing activities   $ (7.2)
Cumulative catch-up adjustment to opening retained earnings $ (4.5)