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Stock-based Compensation (Tables)
 9 Months Ended
Sep. 30, 2019
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.
 
Shares (thousands)
 
Weighted Average
Grant Date
Fair Value
Weighted Average
Remaining
Contractual Life
(in years)
Unvested as of June 30, 2019
696.3

 
$
144.17

2.25
Granted
1,130.1

 
141.14

 
Vested
(45.8
)
 
122.48

 
Forfeited
(8.1
)
 
138.96

 
Unvested as of September, 2019
1,772.5

 
$
142.82

2.59
 
 
 
 
 
Unvested as of June 30, 2018
750.3

 
$
131.09

2.36
Granted
5.8

 
144.43

 
Vested
(81.2
)
 
123.08

 
Forfeited
(35.5
)
 
136.07

 
Unvested as of September 30, 2018
639.4

 
$
131.93

2.21
 
Shares (thousands)
 
Weighted Average
Grant Date
Fair Value
Weighted Average
Remaining
Contractual Life
(in years)
Unvested as of December 31, 2018
652.7

 
$
131.32

2.02
Granted
1,410.3

 
149.22

 
Vested
(268.3
)
 
116.25

 
Forfeited
(22.2
)
 
134.54

 
Unvested as of September, 2019
1,772.5

 
$
142.82

2.59
 
 
 
 
 
Unvested as of December 31, 2017
727.7

 
$
118.96

1.24
Granted
225.8

 
161.87

 
Vested
(259.3
)
 
122.63

 
Forfeited
(54.8
)
 
132.64

 
Unvested as of September 30, 2018
639.4

 
$
131.93

2.21