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Stock Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2012
Stock-Based Compensation [Abstract]  
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]
The following table summarizes the Company's pre-tax compensation expense and related income tax benefit for the years ended December 31, 2012, 2011 and 2010 related to the Company's performance units and restricted stock.
Year ended December 31 (In millions)
2012
2011
2010
Performance units
 
 
 
Total shareholder return
$
8.0

$
8.2

$
6.8

Earnings per share
4.2

5.5

2.5

Total performance units
12.2

13.7

9.3

Restricted stock
0.6

1.0

0.9

Total compensation expense
$
12.8

$
14.7

$
10.2

Income tax benefit
$
4.9

$
5.7

$
3.9
Performance Units Total Shareholder Return Valuation Assumptions [Table Text Block]
The number of performance units granted based on total shareholder return and the assumptions used to calculate the grant date fair value of the performance units based on total shareholder return are shown in the following table.
 
2012
2011
2010
Number of units granted
169,339

213,721

214,750

Fair value of units granted
$
51.82

$
46.09

$
39.43

Expected dividend yield
3.0
%
3.2
%
3.9
%
Expected price volatility
22.0
%
33.0
%
34.0
%
Risk-free interest rate
0.38
%
1.40
%
1.42
%
Expected life of units (in years)
2.87

2.87

2.87
Performance Units Earnings Per Share Valuation Assumptions [Table Text Block]
The number of performance units granted based on earnings per share and the grant date fair value are shown in the following table. 
 
2012
2011
2010
Number of units granted
40,797

71,238

71,585

Fair value of units granted
$
47.63

$
41.61

$
32.44
Restricted Stock Valuation Assumptions [Table Text Block]
The number of shares of restricted stock granted and the grant date fair value are shown in the following table. 
 
2012
2011
2010
Shares of restricted stock granted
5,412

17,902

26,653

Fair value of restricted stock granted
$
53.44

$
48.82

$
40.78
Schedule of Share-based Compensation, Activity [Table Text Block]
A summary of the activity for the Company's performance units and restricted stock at December 31, 2012 and changes in 2012 are shown in the following table.
 
Performance Units
 
 
 
Total Shareholder Return
Earnings Per Share
Restricted Stock
(dollars in millions)
Number
of Units
Aggregate Intrinsic Value
Number
of Units
Aggregate Intrinsic Value
Number
of Shares
Aggregate Intrinsic Value
Units/Shares Outstanding at 12/31/11
706,124

 
235,376

 
37,244

 
Granted (A)
169,339

 
40,797

 
5,412

 
Converted (B)
(291,294
)
$
30.6

(97,099
)
$
10.2

N/A

 
Vested
N/A

 
N/A

 
(15,847
)
$
0.9

Forfeited
(49,605
)
 
(15,155
)
 
(2,256
)
 
Units/Shares Outstanding at 12/31/12
534,564

$
46.3

163,919

$
13.8

24,553

$
1.4

Units/Shares Fully Vested at 12/31/12
188,633

$
21.2

62,880

$
7.1

 
 
(A)
For performance units, this represents the target number of performance units granted.  Actual number of performance units earned, if any, is dependent upon performance and may range from 0 percent to 200 percent of the target.
(B)
These amounts represent performance units that vested at December 31, 2011 which were settled in February 2012.

Schedule of Nonvested Share Activity [Table Text Block]
A summary of the activity for the Company's non-vested performance units and restricted stock at December 31, 2012 and changes in 2012 are shown in the following table.
 
Performance Units
 
 
 
Total Shareholder Return
Earnings Per Share
Restricted Stock
 
Number
of Units
 
Weighted-Average
Grant Date
Fair Value
Number
of Units
 
Weighted-Average
Grant Date
Fair Value
Number
of Shares
Weighted-Average
Grant Date
Fair Value
Units/Shares Non-Vested at 12/31/11
414,830

 
$
42.75

138,277

 
$
37.01

37,244

$
44.24

Granted
169,339

(A)
$
51.82

40,797

(A)
$
47.63

5,412

$
53.44

Vested
(188,633
)
 
$
39.43

(62,880
)
 
$
32.44

(15,847
)
$
42.78

Forfeited
(49,605
)
 
$
44.24

(15,155
)
 
$
38.02

(2,256
)
$
44.22

Units/Shares Non-Vested at 12/31/12
345,931

 
$
48.79

101,039

 
$
44.00

24,553

$
47.21

Units/Shares Expected to Vest
323,303

 
 
94,557

 
 
24,553

 
(A)
For performance units, this represents the target number of performance units granted.  Actual number of performance units earned, if any, is dependent upon performance and may range from 0 percent to 200 percent of the target.
Fair Value of Vested Performance Units and Restricted Stock [Table Text Block]
A summary of the Company's fair value for its vested performance units and restricted stock is shown in the following table.
Year ended December 31 (In millions)
2012
2011
2010
Performance units
 
 
 
Total shareholder return
$
7.4

$
7.4

$
5.4

Earnings per share
4.1

3.9

1.9

Restricted stock
0.7

1.0

0.6
Schedule of Unrecognized Compensation Cost, Nonvested Awards [Table Text Block]
A summary of the Company's unrecognized compensation cost for its non-vested performance units and restricted stock and the weighted-average periods over which the compensation cost is expected to be recognized are shown in the following table.
December 31, 2012
Unrecognized Compensation Cost (in millions)
Weighted Average to be Recognized (in years)
Performance units
 
 
Total shareholder return
$
7.7

1.64
Earnings per share
3.9

1.14
Total performance units
11.6

 
Restricted stock
0.5

1.96
Total
$
12.1

 
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
A summary of the activity for the Company's stock options at December 31, 2012 and changes during 2012 are shown in the following table. 
(dollars in millions)
Number of Options
Weighted-Average Exercise Price
Aggregate Intrinsic Value
Weighted-Average Remaining Contractual Term
Options Outstanding at 12/31/11
55,800

$
23.19

 

 
 
Exercised
(36,200
)
$
23.41

$
2.0

 
 
Options Outstanding at 12/31/12
19,600

$
22.80

$
0.6

0.95
years
Options Fully Vested and Exercisable at 12/31/12
19,600

$
22.80

$
0.6

0.95
years
Exercised Stock Options [Table Text Block]
A summary of the activity for the Company's exercised stock options in 2012, 2011 and 2010 are shown in the following table. 
Year ended December 31 (In millions)
2012
2011
2010
Intrinsic value (A)
$
2.0

$
2.2

$
2.5

Cash received from stock options exercised
0.8

1.3

3.2

Income tax benefit realized for the tax deductions from exercised stock options (B)
—

—

1.0

(A)
The difference between the market value on the date of exercise and the option exercise price.
(B)
The Company did not realize an income tax benefit for the tax deductions from the exercised stock options in 2012 and 2011 due to the Company being in a tax net operating loss position in 2012 and 2011.