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STOCK-BASED COMPENSATION - Schedule of Stock-Based Compensation Expense (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Allocation of stock-based compensation expense        
Total stock-based compensation expense $ 22.3 $ 19.2 $ 43.1 $ 37.6
Cost of sales        
Allocation of stock-based compensation expense        
Total stock-based compensation expense 3.9 2.8 7.9 5.8
Selling, general, and administrative expenses        
Allocation of stock-based compensation expense        
Total stock-based compensation expense 14.3 12.7 27.0 24.5
Research and development expenses        
Allocation of stock-based compensation expense        
Total stock-based compensation expense $ 4.1 $ 3.7 $ 8.2 $ 7.3