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Stockholders' Equity - Share-based Compensation Expense (Details) - Stock Options - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Share-based compensation expense        
Share-based compensation expense before taxes $ 12.2 $ 15.3 $ 16.8 $ 18.4
Related income tax benefit (4.5) (5.7) (6.2) (6.8)
Share-based compensation benefit, net of taxes 7.7 9.6 10.6 11.6
Cost of product sales        
Share-based compensation expense        
Share-based compensation expense before taxes 0.3 0.1 0.5 0.2
Research and development        
Share-based compensation expense        
Share-based compensation expense before taxes 1.1 0.4 1.6 0.5
Selling, general and administrative        
Share-based compensation expense        
Share-based compensation expense before taxes $ 10.8 $ 14.8 $ 14.7 $ 17.7