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Stock-Based Awards and Other Equity Instruments (Tables)
 12 Months Ended
Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]  
Schedule of Restricted Stock Units Activity
The following table presents a summary of RSU activity:
RSUsWeighted Average
Grant-Date Fair
Value
 (In thousands) 
Balance as of December 31, 20226,630 $146.43 
Granted5,191 96.93 
Vested(2,880)127.48 
Cancelled(868)129.00 
Balance as of December 31, 20238,073 123.24 
The following table presents a summary of PSU activity:
PSUsWeighted Average
Grant-Date Fair
Value
 (In thousands) 
Shares probable to be issued as of December 31, 202233 $87.58 
Granted232 99.87 
Performance Shares Adjustment(1)
117 100.25 
Vested(24)86.30 
Cancelled(81)111.91 
Shares probable to be issued as of December 31, 2023277 99.84 
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(1)Outcome for vested performance-based awards is updated based upon achievement of certain stock price growth rate targets of the Company’s common stock. Probable outcome for unvested performance-based awards is based upon achievement of certain stock price growth rate targets of the Company’s common stock as of December 31, 2023.
The following table summarizes the estimated vesting, as of December 31, 2023, of PSUs granted in 2023, 2022 and 2021, net of forfeiture and vesting since the respective grant dates:
By Grant Year
Performance Stock Units202320222021Total Weighted Average
Grant-Date Fair
Value
(In thousands)
Shares probable to be issued277 — — 277 $99.84 
Shares not subject to the achievement of minimum performance thresholds— — — — — 
Shares that could be issued if maximum performance thresholds are met444 183 248 875 151.44
Schedule of Stock Option Activity
The following table presents a summary of our stock option activity:
OptionsWeighted Average
Exercise Price		Remaining
Contractual Life		Aggregate
Intrinsic Value
 (In thousands) (In years)(In millions)
Balance as of December 31, 20224,075 $135.93 
Exercised(538)110.77 
Cancelled(326)105.74 
Balance as of December 31, 20233,211 143.42 3.2$40 
Exercisable as of December 31, 2023936 109.97 0.940 
Vested and expected to vest after December 31, 20233,211 143.42 3.240 
Schedule of Weighted Average Assumptions of Black-Scholes and Monte Carlo Option-Pricing Models The fair value of stock options granted during 2021 were estimated at the date of grant using the Black-Scholes option-pricing model, assuming the following weighted average assumptions:
Risk-free interest rate0.82 %
Expected volatility42.64 %
Expected life (in years)5.13
Dividend yield— %
Weighted-average estimated fair value of options granted during the year$60.39