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Share-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2020
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,
202020192018
Weighted-average grant-date fair value per share$28.53 $30.66 $26.67 
Expected term (years)4.85.05.5
Risk-free interest rate1.66 %2.24 %2.30 %
Expected volatility46.60 %50.94 %59.41 %
Summary of Stock Option Activity Rollforward The following table summarizes our stock option activity from continuing operations:
 December 31, 2020
 Number
of Shares		Weighted-average
Exercise
Price		Aggregate Intrinsic ValueWeighted- average Remaining Contractual Term
Outstanding at beginning of year0.63 $46.01 
Granted0.11 68.80 
Exercised(0.31)35.66 
Forfeited / Cancelled(0.07)59.76 
Outstanding at end of year0.36 $57.95 $22.6 6.1 years
Vested and expected to vest at end of year0.36 $57.67 $9.3 6.0 years
Exercisable at end of year0.15 $56.51 $22.1 4.5 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, 2020
 Number
of Shares		Weighted-Average
Grant-Date Fair Value
Unvested at beginning of year0.22 $55.46 
Granted0.09 63.32 
Forfeited(0.02)63.89 
Vested(0.10)51.23 
Unvested at end of year0.19 $60.28 
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, 2020
 Number
of Shares		Weighted-Average
Grant-Date Fair Value
Unvested at beginning of year0.04 $61.71 
Granted0.04 67.50 
Vested— 38.51 
Forfeited(0.01)60.91 
Unvested at end of year0.07 $66.76