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SHARE-BASED COMPENSATION (Tables)
3 Months Ended
Mar. 31, 2024
Share-Based Payment Arrangement [Abstract]  
Summary of RSU Activity
A summary of RSU activity under all stock plans for the three months ended March 31, 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 granted2.2 $388.09 
RSUs vested(1.6)$234.60 
RSUs forfeited(0.1)$262.23 
Unvested balance as of March 31, 2024
5.5 $305.87 
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, 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(1.1)$107.06 
Options forfeited/expired— $250.01 
Balance as of March 31, 2024
8.7 $182.70 
Share-Based Payment Arrangement, Performance Shares, Activity
A summary of PSU activity for the three months ended March 31, 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— $271.58 
Performance change— $290.33 
Forfeited— $251.44 
Unvested balance as of March 31, 20240.3 $306.93 
Summary of Share-Based Compensation Expense
The following table summarizes share-based compensation expense for the three months ended March 31, 2024, and 2023 (in millions):
 Three Months Ended March 31,
 20242023
Cost of revenue – products (before capitalization)
$22.8 $23.0 
Amounts capitalized into inventory
(21.4)(18.8)
Amounts recognized in income for amounts previously capitalized in inventory21.3 12.6 
Cost of revenue – products
$22.7 $16.8 
Cost of revenue – services
7.0 7.0 
Total cost of revenue
29.7 23.8 
Selling, general, and administrative68.2 66.7 
Research and development57.7 50.1 
Share-based compensation expense before income taxes155.6 140.6 
Income tax benefit32.4 28.0 
Share-based compensation expense after income taxes$123.2 $112.6 
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, 2024, and 2023, were as follows:
 Three Months Ended March 31,
 20242023
Stock Options
Risk-free interest rate4.8%
Expected term (in years)3.4
Expected volatility34%
Fair value at grant date$72.13
ESPP
Risk-free interest rate4.6%4.7%
Expected term (in years)1.21.2
Expected volatility32%35%
Fair value at grant date$115.48$79.33