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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2016
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)
2016
 
2015
 
2014
 
2016
 
2015
 
2014
Outstanding, at beginning of year
2.1

 
2.0

 
2.1

 
$
10.29

 
$
9.28

 
$
8.63

Granted
0.7

 
0.3

 
0.3

 
12.69

 
16.08

 
14.36

Exercised
(0.1
)
 
(0.1
)
 
(0.3
)
 
8.39

 
7.34

 
7.49

Canceled or expired
(0.1
)
 
(0.1
)
 
(0.1
)
 
15.77

 
14.69

 
14.33

Outstanding, at end of year
2.6

 
2.1

 
2.0

 
$
10.71

 
$
10.29

 
$
9.28

Exercisable, at end of year
1.6

 
1.4

 
1.2

 
$
8.96

 
$
8.47

 
$
8.64
Summary of Information Concerning Stock Options Outstanding
The following table summarizes information for stock options outstanding as of December 31, 2016 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

 
5.0
 
$
6.70

 
1.1

 
$
6.70

10.01 — 15.00
1.1

 
7.8
 
12.88

 
0.3

 
12.89

15.01 — 20.00
0.4

 
7.0
 
16.09

 
0.2

 
16.10

 
2.6

 
6.5
 
$
10.71

 
1.6

 
$
8.96
Summary of Restricted Stock Grants
The following table summarizes restricted stock activity for the year ended December 31, 2016:
 
Number of
Restricted Shares
 
Weighted Average
Price per Share
 
(in millions)
 
 
Outstanding and non-vested, at December 31, 2015
0.2

 
$
12.70

Granted
0.1

 
13.16

Vested
(0.1
)
 
11.10

Forfeited
—

 
13.87

Outstanding and non-vested, at December 31, 2016
0.2

 
$
14.03
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:
 
2016
 
2015
 
2014
Dividend yield
2.2
%
 
1.5
%
 
0.8
%
Expected volatility
43
%
 
46
%
 
57
%
Risk free interest rate
1.3
%
 
1.5
%
 
1.9
%
Weighted average expected option life in years
5.8

 
5.7

 
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, 2016:
 
Number of PSUs
 
Weighted Average Price per Share
 
(in millions)
 
 
Outstanding and non-vested, at December 31, 2015
0.3

 
$
15.28

Granted (a)
0.4

 
13.33

Vested
(0.3
)
 
14.46

Forfeited
—

 
15.47

Outstanding and non-vested, at December 31, 2016
0.4

 
$
13.91


(a)
Includes 0.1 million PSUs, representing the effect of the PSUs granted in 2014 being earned at 200% of target. The PSUs granted in 2014 vested on December 31, 2016.