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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
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)
2017
 
2016
 
2015
 
2017
 
2016
 
2015
Outstanding, at beginning of year
2.6

 
2.1

 
2.0

 
$
10.71

 
$
10.29

 
$
9.28

Granted
0.5

 
0.7

 
0.3

 
15.30

 
12.69

 
16.08

Exercised
(0.3
)
 
(0.1
)
 
(0.1
)
 
10.53

 
8.39

 
7.34

Canceled or expired
(0.5
)
 
(0.1
)
 
(0.1
)
 
14.10

 
15.77

 
14.69

Outstanding, at end of year
2.3

 
2.6

 
2.1

 
$
11.08

 
$
10.71

 
$
10.29

Exercisable, at end of year
1.6

 
1.6

 
1.4

 
$
9.57

 
$
8.96

 
$
8.47
Summary of Information Concerning Stock Options Outstanding
The following table summarizes information for stock options outstanding as of December 31, 2017 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
1.0

 
4.0
 
$
6.63

 
1.0

 
$
6.63

10.01 — 15.00
0.8

 
7.5
 
13.02

 
0.4

 
13.30

15.01 — 20.00
0.5

 
8.1
 
16.51

 
0.2

 
16.09

 
2.3

 
6.2
 
$
11.08

 
1.6

 
$
9.57
Summary of Restricted Stock Grants
The following table summarizes restricted stock activity for the year ended December 31, 2017:
 
Number of
Restricted Shares
 
Weighted Average
Price per Share
 
(in millions)
 
 
Outstanding and non-vested, at December 31, 2016
0.2

 
$
14.03

Granted
0.2

 
16.94

Vested
(0.1
)
 
15.09

Forfeited
(0.1
)
 
15.69

Outstanding and non-vested, at December 31, 2017
0.2

 
$
15.52
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:
 
2017
 
2016
 
2015
Dividend yield
1.7
%
 
2.2
%
 
1.5
%
Expected volatility
45
%
 
43
%
 
46
%
Risk free interest rate
2.2
%
 
1.3
%
 
1.5
%
Weighted average expected option life in years
7.5

 
5.8

 
5.7
PSUs  
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, 2017:
 
Number of PSUs
 
Weighted Average Price per Share
 
(in millions)
 
 
Outstanding and non-vested, at December 31, 2016
0.4

 
$
13.91

Granted
0.2

 
17.00

Vested
—

 
15.83

Forfeited (a)
(0.3
)
 
14.95

Outstanding and non-vested, at December 31, 2017
0.3

 
$
15.19


(a)
Includes 0.1 million PSUs, representing the effect of the PSUs granted in 2015 not meeting the targets over the applicable performance period, which ended on December 31, 2017.