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STOCK-BASED COMPENSATION - Schedule of Stock-Based Compensation Expense (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Allocation of stock-based compensation expense        
Total stock-based compensation expense $ 17.4 $ 15.8 $ 55.0 $ 46.3
Cost of sales        
Allocation of stock-based compensation expense        
Total stock-based compensation expense 2.7 2.4 8.5 7.0
Selling, general, and administrative expenses        
Allocation of stock-based compensation expense        
Total stock-based compensation expense 11.9 10.3 36.4 30.5
Research and development expenses        
Allocation of stock-based compensation expense        
Total stock-based compensation expense $ 2.8 $ 3.1 $ 10.1 $ 8.8