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Stock-Based Compensation Plans (Tables)
9 Months Ended
Sep. 30, 2018
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, 2018:
 
  Number of Shares
 
Weighted Average Exercise Price
Outstanding at December 31, 2017
8,465,398

 
$
33.74

Granted
903,797

 
67.71

Exercised
(905,914
)
 
26.30

Forfeited or expired
(28,664
)
 
47.54

Outstanding at September 30, 2018
8,434,617

 
38.13

Summary of Restricted Stock Award Activity
The following table presents a summary of restricted stock award activity for the nine months ended September 30, 2018:
 
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, 2017
1,188,662

 
$
45.07

 
285,164

 
$
29.95

Granted
438,209

 
70.39

 
19,173

 
70.99

RS Vested/RSUs Issued
(552,217
)
 
44.88

 
(151,170
)
 
22.95

Forfeited
(51,645
)
 
49.33

 

 

Outstanding at September 30, 2018
1,023,009

 
55.80

 
153,167

 
42.00

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, 2018:
 
Number of Units
 
Weighted Average Grant Date Fair Value
Outstanding at December 31, 2017
6,851,542

 
$
0.81

Granted
3,830,000

 
0.83

Vested
(2,052,959
)
 
0.95

Forfeited
(10,000
)
 
0.92

Outstanding at September 30, 2018
8,618,583

 
0.79