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Stock-Based Compensation Plans (Tables)
 9 Months Ended
Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Stock Option Award Activity
The following table presents a summary of our stock option award activity for the nine months ended September 30, 2014:
 
  Number of Shares(a)
 
Weighted Average Exercise Price
Outstanding at December 31, 2013
5,147,837

 
$
40.08

Granted
446,310

 
85.02

Exercised
(696,159
)
 
32.12

Forfeited, canceled or expired
(20,761
)
 
49.67

Outstanding at September 30, 2014
4,877,227

 
45.28

(a) 
Includes an immaterial number of stock appreciation rights.
Summary of Restricted Stock Award Activity
The following table presents a summary of restricted stock award activity for the nine months ended September 30, 2014:
 
Shares of Restricted Stock ("RS")
 
Restricted Stock Units ("RSU")
 
Number of Shares
 
Weighted Average Grant Date Fair Value
 
Number of Units
 
Weighted Average Grant Date Fair Value
Outstanding at December 31, 2013
624,122

 
$
61.11

 
385,079

 
$
33.96

Granted
240,882

 
87.81

 
19,827

 
86.79

RS's Vested/RSU's Issued
(324,697
)
 
55.47

 
(398
)
 
60.11

Forfeited
(25,943
)
 
70.10

 
(133
)
 
76.10

Outstanding at September 30, 2014
514,364

 
76.73

 
404,375

 
36.51
Schedule of Performance Unit Awards
The following table presents a summary of the activity for performance unit awards to be settled in shares for the nine months ended September 30, 2014:
 
Number of Units
Outstanding at December 31, 2013
3,822,500

Granted
2,033,700

Settled
—

Canceled
—

Outstanding at September 30, 2014
5,856,200