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Stockholders' Equity - Share-based Compensation Expense (Details) - Stock Options - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Share-based compensation expense    
Share-based compensation expense before taxes $ 4.6 $ 3.1
Related income tax benefit (1.7) (1.1)
Share-based compensation benefit, net of taxes 2.9 2.0
Cost of product sales    
Share-based compensation expense    
Share-based compensation expense before taxes 0.2 0.1
Research and development    
Share-based compensation expense    
Share-based compensation expense before taxes 0.5 0.1
Selling, general and administrative    
Share-based compensation expense    
Share-based compensation expense before taxes $ 3.9 $ 2.9