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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Allocation of stock-based compensation expense        
Total stock-based compensation expense $ 19.8 $ 17.4 $ 62.9 $ 55.0
Cost of sales        
Allocation of stock-based compensation expense        
Total stock-based compensation expense 3.6 2.7 11.5 8.5
Selling, general, and administrative expenses        
Allocation of stock-based compensation expense        
Total stock-based compensation expense 12.4 11.9 39.4 36.4
Research and development expenses        
Allocation of stock-based compensation expense        
Total stock-based compensation expense $ 3.8 $ 2.8 $ 12.0 $ 10.1