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Stock-based Compensation (Tables)
 3 Months Ended
Mar. 31, 2020
Share-based Payment Arrangement [Abstract]  
Restricted Stock Unit Activity
Restricted stock unit ("RSU") and performance stock unit ("PSU") awards activity is presented in the following tables.
 
 
RSU Shares
(in 000's)
PSU Shares
(in 000's)
 
Total Shares
(in 000's)
 
Weighted Average
Grant Date
Fair Value
Weighted Average
Remaining
Contractual Life
(in years)
Unvested as of December 31, 2019
1,532.3

286.8

 
1,819.1

 
$
141.51

2.39
Granted
9.7

—

 
9.7

 
160.03

 
Vested
(324.6
)
—

 
(324.6
)
 
136.91

 
Forfeited
(8.5
)
—

 
(8.5
)
 
137.68

 
Unvested as of March 31, 2020
1,208.9

286.8

 
1,495.7

 
$
144.71

1.78
 
 
 
 
 
 
 
 
Unvested as of December 31, 2018
559.6

93.1

 
652.7

 
$
131.32

2.02
Granted
74.7

—

 
74.7

 
152.84

 
Vested
(195.5
)
—

 
(195.5
)
 
114.79

 
Forfeited
(4.5
)
(0.4
)
 
(4.9
)
 
126.70

 
Unvested as of March 31, 2019
434.3

92.7

 
527.0

 
$
140.55

2.15