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Stock-Based Compensation Plans (Tables)
 6 Months Ended
Jun. 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 six months ended June 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
(583,773
)
 
31.21

Forfeited, canceled or expired
(20,761
)
 
49.67

Outstanding at June 30, 2014
4,989,613

 
45.09

(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 six months ended June 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
232,594

 
88.19

 
12,889

 
89.16

RS's Vested/RSU's Issued
(264,470
)
 
58.48

 
(398
)
 
60.11

Forfeited
(16,446
)
 
65.72

 
(133
)
 
76.10

Outstanding at June 30, 2014
575,800

 
73.13

 
397,437

 
35.71
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 six months ended June 30, 2014:
 
Number of Units
Outstanding at December 31, 2013
3,822,500

Granted
2,033,700

Settled
—

Canceled
—

Outstanding at June 30, 2014
5,856,200