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Presentation of Financial Statements (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Accounting Changes [Line Items]        
Income tax benefit $ (166.7) $ (167.9) $ (274.7) $ (283.4)
Accounting Standards Update 2016-09 [Member]        
Accounting Changes [Line Items]        
Income tax benefit     14.8  
Excess tax benefit from share-based compensation, operating activities       13.4
Excess tax benefit from share-based compensation, financing activities       $ (13.4)
Cumulative catch-up adjustment to opening retained earnings $ (4.5)   $ (4.5)