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SHARE-BASED COMPENSATION (Tables)
 9 Months Ended
Sep. 30, 2024
Share-Based Payment Arrangement [Abstract]  
Summary of RSU Activity
A summary of RSU activity under all stock plans for the nine months ended September 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 granted2.4 $390.22 
RSUs vested(1.8)$236.63 
RSUs forfeited(0.3)$282.86 
Unvested balance as of September 30, 2024
5.3 $311.73 
Summary of Stock Option Activity Under All Stock Plans
A summary of stock option activity under all stock plans for the nine months ended September 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(2.2)$117.26 
Options forfeited or expired
(0.1)$255.85 
Balance as of September 30, 2024
7.5 $190.36 
Share-Based Payment Arrangement, Performance Shares, Activity
A summary of PSU activity for the nine months ended September 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— $276.20 
Performance change— $290.33 
Forfeited— $294.75 
Unvested balance as of September 30, 20240.3 $306.94 
Summary of Share-Based Compensation Expense
The following table summarizes share-based compensation expense for the three and nine months ended September 30, 2024, and 2023 (in millions):
 Three Months Ended September 30,Nine Months Ended September 30,
 2024202320242023
Cost of revenue – product (before capitalization)
$27.5 $24.7 $75.7 $70.4 
Amounts capitalized into inventory
(25.6)(23.2)(70.7)(63.1)
Amounts recognized in income for amounts previously capitalized in inventory23.0 21.1 66.2 53.0 
Cost of revenue – product
$24.9 $22.6 $71.2 $60.3 
Cost of revenue – service
7.9 7.3 22.5 21.3 
Total cost of revenue
32.8 29.9 93.7 81.6 
Selling, general, and administrative77.6 71.9 225.4 206.6 
Research and development65.4 55.3 188.7 157.7 
Share-based compensation expense before income taxes175.8 157.1 507.8 445.9 
Income tax benefit36.9 28.7 105.4 85.2 
Share-based compensation expense after income taxes$138.9 $128.4 $402.4 $360.7 
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 nine months ended September 30, 2024, and 2023, were as follows:
 Three Months Ended September 30,Nine Months Ended September 30,
 2024202320242023
Stock Options
Risk-free interest rate—4.5%—4.6%
Expected term (in years)—2.9—3.2
Expected volatility—32%—33%
Fair value at grant date—$82.63—$77.41
ESPP
Risk-free interest rate4.6%5.2%4.6%5.0%
Expected term (in years)1.21.21.21.2
Expected volatility29%31%29%33%
Fair value at grant date$131.01$98.96$130.00$89.42