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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock Option Activity
The following summarizes stock option activity: 
 
Option Shares
 
Weighted Average Exercise Price
(in millions)
2014
 
2013
 
2012
 
2014
 
2013
 
2012
Outstanding, at beginning of year
2.1

 
2.3

 
2.0

 
$
8.63

 
$
8.93

 
$
10.16

Granted
0.3

 
0.5

 
0.6

 
14.36

 
8.50

 
5.52

Exercised
(0.3
)
 
(0.3
)
 
—

 
7.49

 
7.47

 
—

Canceled or expired
(0.1
)
 
(0.4
)
 
(0.3
)
 
14.33

 
10.94

 
9.88

Outstanding, at end of year
2.0

 
2.1

 
2.3

 
$
9.28

 
$
8.63

 
$
8.93

Exercisable, at end of year
1.2

 
1.2

 
1.3

 
$
8.64

 
$
9.85

 
$
11.22
Summary of Information Concerning Stock Options Outstanding
The following table summarizes information for stock options outstanding as of December 31, 2014 under all plans:
 
Options Outstanding
 
Options Exercisable
Range of Exercise Prices
Shares
 
Weighted Average
Remaining Life
 
Weighted Average
Exercise Price
 
Shares
 
Weighted Average
Exercise Price
 
(in millions)
 
(in years)
 
 
 
(in millions)
 
 
$0.00 — $5.00
—

 
6.7
 
$
4.47

 
—

 
$
4.47

5.01 — 10.00
1.3

 
7.1
 
6.75

 
0.8

 
6.44

10.01 — 15.00
0.5

 
7.0
 
13.08

 
0.2

 
10.99

15.01 — 20.00
0.2

 
1.3
 
16.46

 
0.2

 
16.46

 
2.0

 
6.6
 
$
9.28

 
1.2

 
$
8.64
Summary of Restricted Stock Grants
The following table summarizes restricted stock activity for the year ended December 31, 2014:
 
Number of
Restricted Shares
 
Weighted Average
Price per Share
 
(in millions)
 
 
Outstanding and non-vested, at December 31, 2013
0.2

 
$
6.85

Granted
0.1

 
14.61

Vested
—

 
15.03

Forfeited
—

 
8.53

Outstanding and non-vested, at December 31, 2014
0.3

 
$
8.63
Equity Option [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Assumptions Used to Calculate Fair Value
The fair value of each option grant was estimated using the Black-Scholes option pricing model with the following weighted average assumptions:
 
2014
 
2013
 
2012
Dividend yield
0.8
%
 
—
%
 
0.7
%
Expected volatility
57
%
 
59
%
 
59
%
Risk free interest rate
1.9
%
 
1.0
%
 
0.9
%
Weighted average expected option life in years
5.8

 
5.8

 
5.6
PSUs [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation, Activity
The following table summarizes PSU activity for the year ended December 31, 2014:
 
Number of PSUs
 
Weighted Average Price per Share
 
(in millions)
 
 
Outstanding and non-vested, at December 31, 2013
0.5

 
$
7.05

Granted (a)
0.4

 
8.97

Vested
(0.5
)
 
5.50

Forfeited
—

 
8.47

Outstanding and non-vested, at December 31, 2014
0.4

 
$
10.89


(a)
Includes 0.2 million PSUs, representing the effect of the PSUs granted in 2012 being earned at 200% of target. The PSUs granted in 2012 vested on December 31, 2014.