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Share-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Valuation Assumptions Weighted-average grant-date fair values of stock options and the assumptions used in estimating the fair values are as follows:
Year Ended December 31,
202120202019
Weighted-average grant-date fair value per share$52.19 $28.53 $30.66 
Expected term (years)4.74.85.0
Risk-free interest rate0.33 %1.66 %2.24 %
Expected volatility53.10 %46.60 %50.94 %
Summary of Stock Option Activity Rollforward The following table summarizes our stock option activity from continuing operations:
 December 31, 2021
 Number
of Shares		Weighted-average
Exercise
Price		Aggregate Intrinsic ValueWeighted- average Remaining Contractual Term
Outstanding at beginning of year0.36 $57.95 
Granted0.06 118.41 
Exercised(0.13)55.39 
Forfeited / Cancelled(0.01)69.10 
Outstanding at end of year0.28 $71.38 $25.1 6.7 years
Vested and expected to vest at end of year0.28 $70.55 $12.5 6.6 years
Exercisable at end of year0.12 $54.20 $24.5 5.1 years
Schedule of Unvested Restricted Stock and RSU Rollforward The following table summarizes our unvested restricted stock and RSUs activity from continuing operations:
 December 31, 2021
 Number
of Shares		Weighted-Average
Grant-Date Fair Value
Unvested at beginning of year0.19 $60.28 
Granted0.06 124.32 
Forfeited(0.01)89.70 
Vested(0.13)61.62 
Unvested at end of year0.11 $87.74 
Schedule of Performance Units Unvested Shares Activity Rollforward The following table, which is stated at a 100% earned percentage, summarizes our performance units activity from continuing operations:
 December 31, 2021
 Number
of Shares		Weighted-Average
Grant-Date Fair Value
Unvested at beginning of year0.07 $66.76 
Granted0.03 118.41 
Vested(0.01)51.68 
Forfeited— 118.41 
Unvested at end of year0.09 $84.44