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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Allocation of stock-based compensation expense        
Total stock-based compensation expense $ 19.2 $ 15.3 $ 37.6 $ 30.5
Cost of sales        
Allocation of stock-based compensation expense        
Total stock-based compensation expense 2.8 2.3 5.8 4.6
Selling, general, and administrative expenses        
Allocation of stock-based compensation expense        
Total stock-based compensation expense 12.7 10.0 24.5 20.2
Research and development expenses        
Allocation of stock-based compensation expense        
Total stock-based compensation expense $ 3.7 $ 3.0 $ 7.3 $ 5.7