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Income Taxes (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
Income Tax Disclosure [Abstract]          
Effective tax rate 4.80% 16.10% 23.60% 15.90%  
Tax benefit for international statutory tax transaction $ 9.8   $ 9.8    
Income tax charge due to change in expectation of realizibility of R&D credits     46.1    
Income tax benefit for first quarter results of share-based payments to employees       $ 18.5  
Net unrecognized tax benefit 76.1   76.1   $ 69.8
Income tax interest and penalties accrued 3.4   3.4    
Deferred tax assets $ 176.5   $ 176.5    
U.S. federal statutory rate     35.00%