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Income Taxes - Effect of adoption of ASU 2016-09 (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Income Tax Effect of adoption of ASU 2016-09        
Income tax expense (benefit) $ 100.2 $ 79.6 $ 185.2 $ 208.0
ASU 2016-09        
Income Tax Effect of adoption of ASU 2016-09        
Cumulative effect on retained earnings, Tax     (3.2)  
Income tax expense (benefit)     $ (3.5)