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Stock-based Compensation (Tables)
 6 Months Ended
Jun. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [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 March 31, 2019
527.0

 
$
140.55

2.15
Granted
204.3

 
150.03

 
Vested
(26.6
)
 
118.02

 
Forfeited
(8.4
)
 
136.19

 
Unvested as of June 30, 2019
696.3

 
$
144.17

2.25
 
 
 
 
 
Unvested as of March 31, 2018
658.0

 
$
126.31

2.20
Granted
100.7

 
164.04

 
Vested
(4.3
)
 
172.95

 
Forfeited
(4.1
)
 
129.03

 
Unvested as of June 30, 2018
750.3

 
$
131.09

2.36
 
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
279.0

 
150.78

 
Vested
(222.1
)
 
115.17

 
Forfeited
(13.3
)
 
132.56

 
Unvested as of June 30, 2019
696.3

 
$
144.17

2.25
 
 
 
 
 
Unvested as of December 31, 2017
727.7

 
$
118.96

1.24
Granted
220.0

 
162.33

 
Vested
(178.1
)
 
122.42

 
Forfeited
(19.3
)
 
125.56

 
Unvested as of June 30, 2018
750.3

 
$
131.09

2.36