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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Allocation of stock-based compensation expense        
Total stock-based compensation expense $ 30.3 $ 24.8 $ 58.5 $ 48.7
Income tax benefit (4.9) (4.1) (8.8) (7.6)
Total stock-based compensation expense, net of tax 25.4 20.7 49.7 41.1
Cost of sales        
Allocation of stock-based compensation expense        
Total stock-based compensation expense 5.7 4.7 11.2 9.3
Selling, general, and administrative expenses        
Allocation of stock-based compensation expense        
Total stock-based compensation expense 18.3 15.3 34.8 29.7
Research and development expenses        
Allocation of stock-based compensation expense        
Total stock-based compensation expense $ 6.3 $ 4.8 $ 12.5 $ 9.7