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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of stock option activity
The following table summarizes stock option activity for the six months ended June 30, 2016:
 
Number of
Shares (in millions)
 
Weighted Average
Exercise
Price per Share
 
Weighted Average
Remaining
Contractual Term
(years)
 
Aggregate
Intrinsic
Value
(in millions)
Outstanding as of December 31, 2015
5.0

 
$
30.08

 
 
 
 
Granted
—

 
—

 
 
 
 
Exercised
(1.0
)
 
29.56

 
 
 
$
18.1

Forfeited or expired
(0.1
)
 
31.60

 
 
 
 
Outstanding as of June 30, 2016
3.9

 
$
30.17

 
2.7
 
$
81.4

Exercisable as of June 30, 2016
3.2

 
$
29.82

 
2.5
 
$
68.3
Summary of restricted stock unit activity
The following table summarizes restricted stock unit (RSU) activity for the six months ended June 30, 2016:
 
Number of
RSUs
(in thousands)
 
Weighted Average
Grant Date Fair
Value per Share
 
Weighted Average
Remaining
Contractual Term
(years)
 
Aggregate
Intrinsic
Value
(in millions)
Outstanding as of December 31, 2015
1,727.3

 
$
34.15

 
 
 
 
Granted
595.6

 
45.04

 
 
 
 
Vested and issued
(324.2
)
 
33.10

 
 
 
 
Forfeited
(143.5
)
 
38.25

 
 
 
 
Outstanding as of June 30, 2016
1,855.2

 
$
37.27

 
1.2
 
$
95.2

Vested and unissued as of June 30, 2016
617.6

 
$
31.05

 
 
 
 
Summary of performance shares activity
The following table summarizes PSU activity for the six months ended June 30, 2016:
 
Number of
PSUs
(in thousands)
 
Weighted Average
Grant Date Fair
Value per Share
Outstanding as of December 31, 2015
143.4

 
$
38.69

Granted
385.1

 
46.50

Vested and issued
—

 
—

Forfeited
(35.5
)
 
43.64

Outstanding as of June 30, 2016
493.0

 
$
44.43