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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Allocation of stock-based compensation expense        
Total stock-based compensation expense $ 26.6 $ 23.0 $ 85.1 $ 71.7
Income tax benefit (4.7) (3.9) (13.5) (11.5)
Total stock-based compensation expense, net of tax 21.9 19.1 71.6 60.2
Cost of sales        
Allocation of stock-based compensation expense        
Total stock-based compensation expense 4.9 4.3 16.1 13.6
Selling, general, and administrative expenses        
Allocation of stock-based compensation expense        
Total stock-based compensation expense 15.9 13.8 50.7 43.5
Research and development expenses        
Allocation of stock-based compensation expense        
Total stock-based compensation expense $ 5.8 $ 4.9 $ 18.3 $ 14.6