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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2015
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)
2015
 
2014
 
2013
 
2015
 
2014
 
2013
Outstanding, at beginning of year
2.0

 
2.1

 
2.3

 
$
9.28

 
$
8.63

 
$
8.93

Granted
0.3

 
0.3

 
0.5

 
16.08

 
14.36

 
8.50

Exercised
(0.1
)
 
(0.3
)
 
(0.3
)
 
7.34

 
7.49

 
7.47

Canceled or expired
(0.1
)
 
(0.1
)
 
(0.4
)
 
14.69

 
14.33

 
10.94

Outstanding, at end of year
2.1

 
2.0

 
2.1

 
$
10.29

 
$
9.28

 
$
8.63

Exercisable, at end of year
1.4

 
1.2

 
1.2

 
$
8.47

 
$
8.64

 
$
9.85
Summary of Information Concerning Stock Options Outstanding
The following table summarizes information for stock options outstanding as of December 31, 2015 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)
 
 
$5.01 — $10.00
1.1

 
6.1
 
$
6.73

 
1.0

 
$
6.52

10.01 — 15.00
0.5

 
6.2
 
13.11

 
0.3

 
12.18

15.01 — 20.00
0.5

 
7.0
 
16.22

 
0.1

 
16.60

 
2.1

 
6.3
 
$
10.29

 
1.4

 
$
8.47
Summary of Restricted Stock Grants
The following table summarizes restricted stock activity for the year ended December 31, 2015:
 
Number of
Restricted Shares
 
Weighted Average
Price per Share
 
(in millions)
 
 
Outstanding and non-vested, at December 31, 2014
0.3

 
$
8.63

Granted
0.1

 
16.18

Vested
(0.2
)
 
8.35

Forfeited
—

 
11.66

Outstanding and non-vested, at December 31, 2015
0.2

 
$
12.70
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:
 
2015
 
2014
 
2013
Dividend yield
1.5
%
 
0.8
%
 
—
%
Expected volatility
46
%
 
57
%
 
59
%
Risk free interest rate
1.5
%
 
1.9
%
 
1.0
%
Weighted average expected option life in years
5.7

 
5.8

 
5.8
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, 2015:
 
Number of PSUs
 
Weighted Average Price per Share
 
(in millions)
 
 
Outstanding and non-vested, at December 31, 2014
0.4

 
$
10.89

Granted (a)
0.4

 
11.62

Vested
(0.5
)
 
8.66

Forfeited
—

 
11.26

Outstanding and non-vested, at December 31, 2015
0.3

 
$
15.28


(a)
Includes 0.2 million PSUs, representing the effect of the PSUs granted in 2013 being earned at 200% of target. The PSUs granted in 2013 vested on December 31, 2015.