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Stock-based Compensation (Tables)
 9 Months Ended
Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Restricted Stock Unit Activity
Restricted stock unit 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, 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
Unvested shares expected to vest as of September 30, 2017
709.3

 
$
118.22

1.43
 
 
 
 
 
Unvested as of June 30, 2016
817.3

 
$
112.58

2.00
Granted
27.0

 
112.75

 
Vested
(96.2
)
 
101.71

 
Forfeited
(2.4
)
 
107.79

 
Unvested as of September 30, 2016
745.7

 
$
114.00

1.91
Unvested shares expected to vest as of September 30, 2016
726.0

 
$
114.10

1.92

 
Shares (thousands)
 
Weighted Average
Grant Date
Fair Value
Weighted Average
Remaining
Contractual Life
(in years)
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
Unvested shares expected to vest as of September 30, 2017
709.3

 
$
118.22

1.43
 
 
 
 
 
Unvested as of December 31, 2015
706.0

 
$
111.78

2.03
Granted
277.6

 
107.96

 
Vested
(190.8
)
 
96.51

 
Forfeited
(47.1
)
 
116.07

 
Unvested as of September 30, 2016
745.7

 
$
114.00

1.91
Unvested shares expected to vest as of September 30, 2016
726.0

 
$
114.10

1.92