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SHARE-BASED COMPENSATION (Tables)
6 Months Ended
Jun. 30, 2023
Share-Based Payment Arrangement [Abstract]  
Summary of RSU Activity
A summary of RSUs activity under all stock plans for the six months ended June 30, 2023, is presented as follows (in millions, except per share amounts):
 SharesWeighted-Average
Grant-Date Fair Value
Unvested balance as of December 31, 2022
4.6 $241.47 
RSUs granted2.3 $232.89 
RSUs vested(1.6)$222.52 
RSUs forfeited(0.1)$246.84 
Unvested balance as of June 30, 2023
5.2 $243.41 
Summary of Stock Option Activity Under All Stock Plans
A summary of stock option activity under all stock plans for the six months ended June 30, 2023, 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, 2022
10.8 $144.86 
Options granted0.7 $233.50 
Options exercised(1.4)$80.73 
Options forfeited/expired(0.1)$254.12 
Balance as of June 30, 2023
10.0 $159.59 
Share-Based Payment Arrangement, Performance Shares, Activity
PSU activity for the six months ended June 30, 2023, was as follows (in millions, except per share amounts):
 
Shares
Weighted-Average
Grant Date Fair Value Per Share
Unvested balance as of December 31, 20220.1 $299.32 
Granted0.1 $240.45 
Vested— $— 
Performance change— $— 
Forfeited— $235.84 
Unvested balance as of June 30, 20230.2 $259.60 
Summary of Share-Based Compensation Expense
The following table summarizes share-based compensation expense for the three and six months ended June 30, 2023, and 2022 (in millions):
 Three Months Ended June 30,Six Months Ended June 30,
 2023202220232022
Cost of sales – products (before capitalization)$22.7 $20.3 $45.7 $39.0 
Amounts capitalized into inventory (1)
(21.1)— (39.9)— 
Amounts recognized in income for amounts previously capitalized in inventory19.3 — 31.9 — 
Cost of sales – products$20.9 $20.3 $37.7 $39.0 
Cost of sales – services7.0 5.8 14.0 11.4 
Total cost of sales27.9 26.1 51.7 50.4 
Selling, general, and administrative68.0 62.7 134.7 123.0 
Research and development52.3 38.5 102.4 75.3 
Share-based compensation expense before income taxes148.2 127.3 288.8 248.7 
Income tax benefit28.5 20.9 56.5 48.1 
Share-based compensation expense after income taxes$119.7 $106.4 $232.3 $200.6 
(1) Share-based compensation expense subject to capitalization into inventory was not material during the three and six months ended June 30, 2022, and, therefore, not recorded. The Company commenced capitalization of share-based compensation expense into inventory during the quarter ended December 31, 2022, on a prospective basis.
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 and six months ended June 30, 2023, and 2022, were as follows:
 Three Months Ended June 30,Six Months Ended June 30,
 2023202220232022
Stock Options
Risk-free interest rate4.3%2.9%4.8%1.7%
Expected term (in years)3.23.33.43.4
Expected volatility32%38%34%36%
Fair value at grant date$83.38$72.35$72.71$80.27
ESPP
Risk-free interest rate—%—%4.7%0.8%
Expected term (in years)0.00.01.21.2
Expected volatility—%—%35%37%
Fair value at grant date$—$—$79.33$88.85