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Share-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
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,
 
2019
 
2018
 
2017
Weighted-average grant-date fair value per share
$
30.66

 
$
26.67

 
$
20.11

Expected term (years)
5.0

 
5.5

 
5.4

Risk-free interest rate
2.24
%
 
2.30
%
 
2.00
%
Expected volatility
50.94
%
 
59.41
%
 
60.31
%
Summary of Stock Option Activity Rollforward The following table summarizes our stock option activity from continuing operations:
 
December 31, 2019
 
Number
of Shares
 
Weighted-average
Exercise
Price
 
Aggregate Intrinsic Value
 
Weighted- average Remaining Contractual Term
Outstanding at beginning of year
0.79

 
$
38.46

 
 
 
 
Granted
0.13

 
66.50

 
 
 
 
Exercised
(0.26
)
 
32.09

 
 
 
 
Forfeited / Cancelled
(0.03
)
 
54.90

 
 
 
 
Outstanding at end of year
0.63

 
$
46.01

 
$
15.0

 
5.2 years
Vested and expected to vest at end of year
0.62

 
$
45.71

 
$
6.9

 
5.1 years
Exercisable at end of year
0.28

 
$
47.12

 
$
14.9

 
3.3 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, 2019
 
Number
of Shares
 
Weighted-Average
Grant-Date Fair Value
Unvested at beginning of year
0.27

 
$
41.01

Granted
0.09

 
67.64

Forfeited
(0.02
)
 
61.42

Vested
(0.12
)
 
30.05

Unvested at end of year
0.22

 
$
55.46
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, 2019
 
Number
of Shares
 
Weighted-Average
Grant-Date Fair Value
Unvested at beginning of year
0.04

 
$
27.49

Granted
0.03

 
69.53

Vested
(0.02
)
 
18.62

Forfeited
(0.01
)
 
73.30

Unvested at end of year
0.04

 
$
61.71