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STOCK-BASED COMPENSATION (Tables)
6 Months Ended
Jun. 30, 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 and six months ended June 30, 2022 and 2021 was as follows (in millions):
 Three Months Ended
June 30,
Six Months Ended
June 30,
 2022202120222021
Cost of sales$6.9 $5.7 $13.1 $11.2 
Selling, general, and administrative expenses21.1 18.3 39.8 34.8 
Research and development expenses8.2 6.3 15.7 12.5 
Total stock-based compensation expense36.2 30.3 68.6 58.5 
Income tax benefit(5.9)(4.9)(10.3)(8.8)
Total stock-based compensation expense, net of tax$30.3 $25.4 $58.3 $49.7 
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
June 30,
Six Months Ended
June 30,
 2022202120222021
Average risk-free interest rate3.0 %0.8 %3.0 %0.8 %
Expected dividend yieldNoneNoneNoneNone
Expected volatility31.4 %33.5 %31.4 %33.5 %
Expected term (years)5.05.05.05.0
Fair value, per option$35.07 $28.60 $35.08 $28.54 
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
June 30,
Six Months Ended
June 30,
 2022202120222021
Average risk-free interest rate1.1 %0.0 %0.3 %0.1 %
Expected dividend yieldNoneNoneNoneNone
Expected volatility31.5 %32.3 %32.1 %36.8 %
Expected term (years)0.60.60.60.6
Fair value, per share$23.63 $26.03 $28.63 $22.65