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Stock-based Compensation (Tables)
 9 Months Ended
Sep. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Restricted Stock Unit Activity
Restricted stock unit activity for the three months ended September 30, 2013 and September 30, 2012 is as follows:
 
Shares
(thousands)

 
Weighted Average
Grant Date
Fair Value

 
Weighted Average
Remaining
Contractual Life
Unvested at July 1, 2013
1,442.2

 
$
71.27

 
 
Granted
58.7

 
91.85

 
 
Vested
(453.5
)
 
71.10

 
 
Forfeited
(22.0
)
 
57.56

 
 
Unvested at September 30, 2013
1,025.4

 
$
72.82

 
2.24
Unvested shares expected to vest
991.1

 
$
72.94

 
2.25
 
 
 
 
 
 
 
Shares
(thousands)

 
Weighted Average
Grant Date
Fair Value

 
Weighted Average
Remaining
Contractual Life
Unvested at July 1, 2012
1,710.5

 
$
68.49

 
 
Granted
15.6

 
70.56

 
 
Vested
(356.9
)
 
69.34

 
 
Forfeited
(16.2
)
 
63.56

 
 
Unvested at September 30, 2012
1,353.0

 
$
68.35

 
2.22
Unvested shares expected to vest
1,310.9

 
$
68.38

 
2.22
Restricted stock unit activity for the nine months ended September 30, 2013 and September 30, 2012 is as follows:

 
Shares
(thousands)

 
Weighted Average
Grant Date
Fair Value

 
Weighted Average
Remaining
Contractual Life
Unvested at January 1, 2013
1,345.9

 
$
68.50

 

Granted
233.9

 
91.33

 

Vested
(513.2
)
 
70.82

 

Forfeited
(41.2
)
 
61.70

 

Unvested at September 30, 2013
1,025.4

 
$
72.82

 
2.24
Unvested shares expected to vest
991.1

 
$
72.94

 
2.25
 
 
 
 
 
 
 
Shares
(thousands)

 
Weighted Average
Grant Date
Fair Value

 
Weighted Average
Remaining
Contractual Life
Unvested at January 1, 2012
1,362.3


$
66.29

 

Granted
592.8


67.08

 

Vested
(574.3
)

62.14

 

Forfeited
(27.8
)

68.70

 

Unvested at September 30, 2012
1,353.0


$
68.35

 
2.22
Unvested shares expected to vest
1,310.9


$
68.38

 
2.22