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STOCK-BASED COMPENSATION - Schedule of Stock-Based Compensation Expense (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Allocation of stock-based compensation expense    
Total stock-based compensation expense $ 28.2 $ 23.9
Income tax benefit (3.9) (3.5)
Total stock-based compensation expense, net of tax 24.3 20.4
Cost of sales    
Allocation of stock-based compensation expense    
Total stock-based compensation expense 5.5 4.6
Selling, general, and administrative expenses    
Allocation of stock-based compensation expense    
Total stock-based compensation expense 16.5 14.4
Research and development expenses    
Allocation of stock-based compensation expense    
Total stock-based compensation expense $ 6.2 $ 4.9