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Compensation Expense Related to Share-Based Compensation (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total share-based compensation expense $ 9.9 $ 7.3 $ 18.9 $ 14.2
Sales, General and Administrative        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total share-based compensation expense 6.2 4.2 11.7 8.3
Research and Development        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total share-based compensation expense $ 3.7 $ 3.1 $ 7.2 $ 5.9