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Stock-based Compensation (Tables)
 9 Months Ended
Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Restricted Stock Unit Activity
RSU and PSU 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, 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
 
 
 
 
 
Unvested as of June 30, 2017
775.9

 
$
117.74

1.61
Granted
5.1

 
115.47

 
Vested
(70.9
)
 
112.64

 
Forfeited
(0.8
)
 
130.32

 
Unvested as of September 30, 2017
709.3

 
$
118.22

1.43

 
Shares (thousands)
 
Weighted Average
Grant Date
Fair Value
Weighted Average
Remaining
Contractual Life
(in years)
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
 
 
 
 
 
Unvested as of December 31, 2016
750.9

 
$
113.97

1.71
Granted
157.0

 
116.50

 
Vested
(177.3
)
 
99.24

 
Forfeited
(21.3
)
 
113.18

 
Unvested as of September 30, 2017
709.3

 
$
118.22

1.43