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SHARE-BASED COMPENSATION (Tables)
3 Months Ended
Mar. 31, 2022
Share-based Payment Arrangement [Abstract]  
Summary of Stock Option Activity Under All Stock Plans
A summary of stock option activity under all stock plans for the three months ended March 31, 2022, is presented as follows (in millions, except per share amounts):
 Stock Options Outstanding
 Number
Outstanding
Weighted-Average
Exercise Price Per
Share
Balance as of December 31, 202111.7 $125.07 
Options granted0.5 $290.51 
Options exercised(0.4)$79.29 
Options forfeited/expired— $226.29 
Balance as of March 31, 202211.8 $134.03 
Summary of RSU Activity
A summary of RSUs activity under all stock plans for the three months ended March 31, 2022, is presented as follows (in millions, except per share amounts):
 SharesWeighted-Average
Grant-Date Fair Value
Unvested balance as of December 31, 20214.8 $207.37 
RSUs granted1.5 $290.84 
RSUs vested(1.6)$186.75 
RSUs forfeited(0.1)$223.75 
Unvested balance as of March 31, 20224.6 $241.94 
Summary of Share-Based Compensation Expense
The following table summarizes share-based compensation expense for the three months ended March 31, 2022, and 2021 (in millions):
 Three Months Ended March 31,
 20222021
Cost of sales–products$18.7 $15.3 
Cost of sales–services5.6 5.7 
Total cost of sales24.3 21.0 
Selling, general, and administrative60.3 53.1 
Research and development36.8 30.1 
Share-based compensation expense before income taxes121.4 104.2 
Income tax benefit27.2 20.6 
Share-based compensation expense after income taxes$94.2 $83.6 
Schedule of Estimated Fair Value of the Option Using Black-Scholes Option Pricing Model, Weighted Average Assumptions The weighted-average estimated fair values of stock options and the rights to acquire stock under the ESPP, as well as the weighted-average assumptions used in calculating the fair values of stock options and the rights to acquire stock under the ESPP that were granted during the three months ended March 31, 2022, and 2021, were as follows:
 Three Months Ended March 31,
 20222021
Stock Options
Risk-free interest rate1.6%0.7%
Expected term (in years)3.54.3
Expected volatility35%34%
Fair value at grant date$80.80$70.33
ESPP
Risk-free interest rate0.8%0.1%
Expected term (in years)1.21.2
Expected volatility37%35%
Fair value at grant date$88.85$74.39