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STOCK-BASED COMPENSATION (Tables)
3 Months Ended
Mar. 31, 2022
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, 2022 and 2021 was as follows (in millions):
 Three Months Ended
March 31,
 20222021
Cost of sales$6.2 $5.5 
Selling, general, and administrative expenses18.7 16.5 
Research and development expenses7.5 6.2 
Total stock-based compensation expense32.4 28.2 
Income tax benefit(4.4)(3.9)
Total stock-based compensation expense, net of tax$28.0 $24.3 
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,
 20222021
Average risk-free interest rate1.9 %0.6 %
Expected dividend yieldNoneNone
Expected volatility33.5 %33.4 %
Expected term (years)5.35.2
Fair value, per option$35.66 $26.28 
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,
 20222021
Average risk-free interest rate0.2 %0.1 %
Expected dividend yieldNoneNone
Expected volatility32.2 %37.5 %
Expected term (years)0.60.6
Fair value, per share$29.52 $22.14