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Stock-Based Awards and Other Equity Instruments (Tables)
 12 Months Ended
Dec. 31, 2022
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, 20215,822 $140.33 
Granted3,967 150.35 
Vested(2,175)139.18 
Cancelled(984)142.14 
Balance as of December 31, 20226,630 146.43 
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, 2021380 $133.42 
Granted125 222.80 
Performance Shares Adjustment(1)
(223)177.35 
Vested(179)88.04 
Cancelled(70)189.02 
Shares probable to be issued as of December 31, 202233 87.58 
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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, 2022.
The following table summarizes the estimated vesting, as of December 31, 2022, of PSUs granted in 2022, 2021 and 2020, net of forfeiture and vesting since the respective grant dates:
By Grant Year
Performance Stock Units202220212020Total Weighted Average
Grant-Date Fair
Value
(In thousands)
Shares probable to be issued— — 33 33 $87.58 
Shares not subject to the achievement of minimum performance thresholds— — 33 33 87.58 
Shares that could be issued if maximum performance thresholds are met205 259 118 582 174.54
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, 20215,191 $129.17 
Exercised(945)103.20 
Cancelled(171)111.66 
Balance as of December 31, 20224,075 135.93 3.5$— 
Exercisable as of December 31, 20221,756 109.19 1.3— 
Vested and expected to vest after December 31, 20224,075 135.93 3.5— 
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