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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Share-based Compensation [Abstract]  
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] The following table set forth the Company’s total activity and related information for employee restricted stock and performance unit award activity for the years ended December 31, 2017, 2016 and 2015:
 
2017
 
2016
 
2015
  
Shares
 
Weighted
Average
Grant
Date Fair
Value
 
Shares
 
Weighted
Average
Grant
Date Fair
Value
 
Shares
 
Weighted
Average
Grant
Date Fair
Value
Outstanding, beginning of year
107,297

 
$
22.04

 
111,084

 
$
22.19

 
76,472

 
$
19.06

Granted
177,846

 
27.20

 
45,252

 
21.55

 
74,020

 
22.83

Vested
(26,271
)
 
21.39

 
(33,414
)
 
21.93

 
(35,859
)
 
16.88

Forfeited
(39,425
)
 
25.68

 
(15,625
)
 
21.91

 
(3,549
)
 
21.92

Outstanding, end of year
219,447

 
$
25.65

 
107,297

 
$
22.04

 
111,084

 
$
22.19

 
 
 
 
 
 
 
 
 
 
 
 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] The fair value of share-based awards granted to employees was estimated at the date of grant using the Black-Scholes option-pricing model. The following table sets forth the weighted average fair values and related assumptions for options granted for the years ended December 31, 2016 and 2015:
 
2017
 
2016
 
2015
Fair value per share
N/A(1)
 
$
6.75

 
$
7.69

Expected dividend yield
N/A(1)
 
1.87
%
 
1.75
%
Risk free interest rate
N/A(1)
 
1.30
%
 
1.60
%
Expected volatility factor
N/A(1)
 
36.27
%
 
36.61
%
Expected life in years
N/A(1)
 
5.3

 
6.0

 
 
 
 
 
 
(1) No stock options granted during 2017
 
 
 
 
 
 
 
 
 
 
 
Share-based Compensation, Stock Options, Activity [Table Text Block] The following table sets forth the Company’s stock option activity and related information for the years ended December 31, 2017, 2016 and 2015:
(millions, except per share amounts)
2017
 
2016
 
2015
  
Options
 
Weighted-
Average
Exercise
Price
 
Options
 
Weighted-
Average
Exercise
Price
 
Options
 
Weighted-
Average
Exercise
Price
Outstanding, beginning of year
2.5

 
$
20.63

 
3.1

 
$
21.45

 
3.4

 
$
21.37

Granted
—

 
—

 
0.2

 
21.55

 
0.3

 
22.86

Exercised
(0.4
)
 
19.38

 
(0.4
)
 
17.18

 
(0.3
)
 
16.54

Canceled
(0.4
)
 
28.96

 
(0.4
)
 
30.70

 
(0.3
)
 
25.63

Outstanding, end of year
1.7

 
$
19.22

 
2.5

 
$
20.63

 
3.1

 
$
21.45

 
 
 
 
 
 
 
 
 
 
 
 
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] The following table sets forth information pertaining to the total options outstanding and exercisable at December 31, 2017:
(Options in millions)
Options Outstanding
 
Options Exercisable
  
Number
 
Weighted-
Average
Remaining
Contractual Life
 
Weighted-
Average
Exercise
Price
 
Number
 
Weighted-
Average
Exercise
Price
Range of Exercise Prices:
 
 
 
 
 
 
 
 
 
$10.01 – $20.00
1.0

 
3.6
 
$
16.53

 
1.0

 
$
16.53

$20.01 – $30.00
0.7

 
4.7
 
23.07

 
0.6

 
23.33

 
1.7

 
4.0
 
$
19.22

 
1.6

 
$
18.98