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SHARE-BASED COMPENSATION (Tables)
6 Months Ended
Jun. 30, 2024
Share-Based Payment Arrangement [Abstract]  
Summary of RSU Activity
A summary of RSU activity under all stock plans for the six months ended June 30, 2024, is presented as follows (in millions, except per share amounts):
 SharesWeighted-Average
Grant-Date Fair Value
Unvested balance as of December 31, 2023
5.0 $245.75 
RSUs granted2.3 $388.34 
RSUs vested(1.7)$235.16 
RSUs forfeited(0.2)$277.75 
Unvested balance as of June 30, 2024
5.4 $308.73 
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, 2024, 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, 2023
9.8 $174.90 
Options granted— $— 
Options exercised(1.6)$113.13 
Options forfeited or expired
(0.1)$256.71 
Balance as of June 30, 2024
8.1 $186.59 
Share-Based Payment Arrangement, Performance Shares, Activity
A summary of PSU activity for the six months ended June 30, 2024, is presented as follows (in millions, except per share amounts):
 
Shares
Weighted-Average
Grant Date Fair Value Per Share
Unvested balance as of December 31, 20230.2 $259.60 
Granted0.1 $395.92 
Vested— $261.62 
Performance change— $290.33 
Forfeited— $294.47 
Unvested balance as of June 30, 20240.3 $306.82 
Summary of Share-Based Compensation Expense
The following table summarizes share-based compensation expense for the three and six months ended June 30, 2024, and 2023 (in millions):
 Three Months Ended June 30,Six Months Ended June 30,
 2024202320242023
Cost of revenue – products (before capitalization)
$25.4 $22.7 $48.2 $45.7 
Amounts capitalized into inventory
(23.7)(21.1)(45.1)(39.9)
Amounts recognized in income for amounts previously capitalized in inventory21.9 19.3 43.2 31.9 
Cost of revenue – products
$23.6 $20.9 $46.3 $37.7 
Cost of revenue – services
7.6 7.0 14.6 14.0 
Total cost of revenue
31.2 27.9 60.9 51.7 
Selling, general, and administrative79.6 68.0 147.8 134.7 
Research and development65.6 52.3 123.3 102.4 
Share-based compensation expense before income taxes176.4 148.2 332.0 288.8 
Income tax benefit36.1 28.5 68.5 56.5 
Share-based compensation expense after income taxes$140.3 $119.7 $263.5 $232.3 
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, 2024, and 2023, were as follows:
 Three Months Ended June 30,Six Months Ended June 30,
 2024202320242023
Stock Options
Risk-free interest rate4.3%4.8%
Expected term (in years)3.23.4
Expected volatility32%34%
Fair value at grant date$83.38$72.71
ESPP
Risk-free interest rate—%—%4.6%4.7%
Expected term (in years)0.00.01.21.2
Expected volatility—%—%32%35%
Fair value at grant date$—$—$115.48$79.33