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SHARE-BASED COMPENSATION (Tables)
9 Months Ended
Sep. 30, 2025
Share-Based Payment Arrangement [Abstract]  
Summary of RSU Activity
RSU activity under all stock plans for the nine months ended September 30, 2025, was as follows (in millions, except per share amounts):
 SharesWeighted-Average
Grant-Date Fair Value
Unvested balance as of December 31, 2024
5.2 $314.39 
RSUs granted1.7 $572.93 
RSUs vested(1.9)$295.37 
RSUs forfeited(0.2)$365.78 
Unvested balance as of September 30, 2025
4.8 $409.25 
Summary of Stock Option Activity Under All Stock Plans
Stock option activity under all stock plans for the nine months ended September 30, 2025, was as follows (in millions, except per share amounts):
 Stock Options Outstanding
 Number
Outstanding
Weighted-Average
Exercise Price Per
Share
Balance as of December 31, 2024
7.1 $192.90 
Options granted— $— 
Options exercised(1.1)$134.37 
Options forfeited or expired
(0.1)$244.44 
Balance as of September 30, 2025
5.9 $203.23 
Share-Based Payment Arrangement, Performance Shares, Activity
PSU activity for the nine months ended September 30, 2025, was as follows (in millions, except per share amounts):
 
Shares
Weighted-Average
Grant Date Fair Value Per Share
Unvested balance as of December 31, 20240.3 $306.94 
Granted0.1 $575.73 
Vested(0.1)$294.89 
Performance change— $268.39 
Forfeited— $366.96 
Unvested balance as of September 30, 20250.3 $374.67 
Summary of Share-Based Compensation Expense
The following table summarizes share-based compensation expense (in millions):
 Three Months Ended September 30,Nine Months Ended September 30,
 2025202420252024
Cost of revenue – product (before capitalization)
$33.0 $27.5 $97.0 $75.7 
Amounts capitalized into inventory
(31.1)(25.6)(90.9)(70.7)
Amounts recognized in income for amounts previously capitalized in inventory29.6 23.0 85.9 66.2 
Cost of revenue – product
$31.5 $24.9 $92.0 $71.2 
Cost of revenue – service
8.8 7.9 25.6 22.5 
Total cost of revenue
40.3 32.8 117.6 93.7 
Selling, general, and administrative
88.1 77.6 256.7 225.4 
Research and development77.6 65.4 221.3 188.7 
Share-based compensation expense before income taxes206.0 175.8 595.6 507.8 
Income tax benefit42.5 36.9 118.8 105.4 
Share-based compensation expense after income taxes$163.5 $138.9 $476.8 $402.4 
Schedule of Estimated Fair Value of the Option Using Black-Scholes Option Pricing Model, Weighted Average Assumptions :
 Three Months Ended September 30,Nine Months Ended September 30,
 2025202420252024
ESPP
Risk-free interest rate3.8%4.6%4.0%4.6%
Expected term (in years)1.21.21.21.2
Expected volatility32%29%31%29%
Fair value at grant date$142.19$131.01$154.69$130.00