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Stock-based Compensation (Tables)
 6 Months Ended
Jun. 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 March 31, 2017
785.7

 
$
117.62

1.82
Granted
11.1

 
118.00

 
Vested
(3.3
)
 
117.81

 
Forfeited
(17.6
)
 
112.71

 
Unvested as of June 30, 2017
775.9

 
$
117.74

1.61
Unvested shares expected to vest as of June 30, 2017
775.9

 
$
117.74

1.61
 
 
 
 
 
Unvested as of March 31, 2016
820.4

 
$
112.83

2.21
Granted
49.7

 
108.75

 
Vested
(9.7
)
 
92.60

 
Forfeited
(43.1
)
 
117.52

 
Unvested as of June 30, 2016
817.3

 
$
112.58

2.00
Unvested shares expected to vest as of June 30, 2016
796.1

 
$
112.69

2.00

 
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
151.9

 
116.54

 
Vested
(106.4
)
 
90.32

 
Forfeited
(20.5
)
 
113.16

 
Unvested as of June 30, 2017
775.9

 
$
117.74

1.61
Unvested shares expected to vest as of June 30, 2017
775.9

 
$
117.74

1.61
 
 
 
 
 
Unvested as of December 31, 2015
706.0

 
$
111.78

2.03
Granted
250.6

 
107.45

 
Vested
(94.6
)
 
91.22

 
Forfeited
(44.7
)
 
116.50

 
Unvested as of June 30, 2016
817.3

 
$
112.58

1.99
Unvested shares expected to vest as of June 30, 2016
796.1

 
$
112.69

2.00