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STOCK-BASED COMPENSATION (Tables)
3 Months Ended
Mar. 31, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Stock-Based Compensation Expense
Stock-based compensation expense related to awards issued under the Company's incentive compensation plans for the three months ended March 31, 2021 and 2020 was as follows (in millions):
 Three Months Ended
March 31,
 20212020
Cost of sales$5.5 $4.6 
Selling, general, and administrative expenses16.5 14.4 
Research and development expenses6.2 4.9 
Total stock-based compensation expense28.2 23.9 
Income tax benefit(3.9)(3.5)
Total stock-based compensation expense, net of tax$24.3 $20.4 
Schedule of Weighted-Average Assumptions for Options Granted
The following table includes the weighted-average grant-date fair values of stock options granted during the periods indicated and the related weighted-average assumptions used in the Black-Scholes option pricing model:
 Option Awards
Three Months Ended
March 31,
 20212020
Average risk-free interest rate0.6 %1.4 %
Expected dividend yieldNoneNone
Expected volatility33.4 %29.7 %
Expected term (years)5.25.2
Fair value, per option$26.28 $22.79 
Schedule of Weighted-Average Assumptions for ESPP Subscriptions Granted
The following table includes the weighted-average grant-date fair values for ESPP subscriptions granted during the periods indicated and the related weighted-average assumptions used in the Black-Scholes option pricing model:
 ESPP
Three Months Ended
March 31,
 20212020
Average risk-free interest rate0.1 %1.6 %
Expected dividend yieldNoneNone
Expected volatility37.5 %31.9 %
Expected term (years)0.60.6
Fair value, per share$22.14 $15.71