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Stockholders' Equity - Share-based Compensation Expense (Details) - Stock Options - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Share-based compensation expense        
Share-based compensation expense before taxes $ 13.1 $ 3.3 $ 29.9 $ 21.7
Related income tax benefit (4.8) (1.1) (11.0) (7.9)
Share-based compensation benefit, net of taxes 8.3 2.2 18.9 13.8
Cost of product sales        
Share-based compensation expense        
Share-based compensation expense before taxes 0.4 0.1 0.9 0.3
Research and development        
Share-based compensation expense        
Share-based compensation expense before taxes 1.0 0.5 2.6 1.0
Selling, general and administrative        
Share-based compensation expense        
Share-based compensation expense before taxes $ 11.7 $ 2.7 $ 26.4 $ 20.4