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Stock Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2014
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, 2014, 2013 and 2012 related to the Company's performance units and restricted stock.
Year ended December 31 (In millions)
2014
2013
2012
Performance units
 
 
 
Total shareholder return
$
8.3

$
8.4

$
8.0

Earnings per share
3.7

2.3

4.2

Total performance units
12.0

10.7

12.2

Restricted stock
—

0.4

0.6

Total compensation expense
12.0

11.1

12.8

Less: Amount paid by unconsolidated affiliates
3.6

3.1

—

Net compensation expense
$
8.4

$
8.0

$
12.8

Income tax benefit
$
3.3

$
3.1

$
4.9
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.
 
2014
2013
2012
Number of units granted
219,106

316,162

338,678

Fair value of units granted
$
34.80

$
25.89

$
25.91

Expected dividend yield
2.5
%
2.8
%
3.0
%
Expected price volatility
20.0
%
20.0
%
22.0
%
Risk-free interest rate
0.67
%
0.37
%
0.38
%
Expected life of units (in years)
2.86

2.84

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. 
 
2014
2013
2012
Number of units granted
73,037

74,570

81,594

Fair value of units granted
$
34.81

$
26.73

$
23.82
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. 
 
2014
2013
2012
Shares of restricted stock granted
7,037

5,940

10,824

Fair value of restricted stock granted
$
35.71

$
29.71

$
26.72
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, 2014 and changes in 2014 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 12/31/13
1,062,060

 
 
354,026

 
 
23,628

 
Granted
219,106

(A)
 
73,037

(A)
 
7,037

 
Converted
(355,078
)
(B)
$
19.3

(118,350
)
(B)
$
8.0

N/A

 
Vested
N/A

 
 
N/A

 
 
(7,876
)
$
0.3

Forfeited
(33,097
)
 
 
(11,026
)
 
 
(10,288
)
 
Units/Shares Outstanding at 12/31/14
892,991

 
$
—

297,687

 
$
8.0

12,501

$
0.4

Units/Shares Fully Vested at 12/31/14
336,147

 
$
—

111,950

 
$
4.8

 
 
(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, 2013 which were settled in February 2014.
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, 2014 and changes in 2014 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 12/31/13
706,982

 
$
25.90

235,676

 
$
25.28

23,628

$
26.30

Granted
219,106

(A)
$
34.80

73,037

(A)
$
34.81

7,037

$
35.71

Vested
(336,147
)
 
$
28.61

(111,950
)
 
$
27.93

(7,876
)
$
26.82

Forfeited
(33,097
)
 
$
27.02

(11,026
)
 
$
26.85

(10,288
)
$
24.65

Units/Shares Non-Vested at 12/31/14
556,844

 
$
29.38

185,737

 
$
29.90

12,501

$
32.65

Units/Shares Expected to Vest
503,991

(B)
 
167,807

(B)
 
12,501

 
(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)
The intrinsic value of the performance units based on total shareholder return and earnings per share is $0.0 million and $6.2 million, respectively.
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)
2014
2013
2012
Performance units
 
 
 
Total shareholder return
$
9.5

$
8.2

$
7.4

Earnings per share
3.8

4.9

4.1

Restricted stock
0.2

0.7

0.7
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, 2014
Unrecognized Compensation Cost (in millions)
Weighted Average to be Recognized (in years)
Performance units
 
 
Total shareholder return
$
7.2

1.63
Earnings per share
2.0

1.76
Total performance units
9.2

 
Restricted stock
0.2

2.47
Total
$
9.4

 
Exercised Stock Options [Table Text Block]
A summary of the activity for the Company's exercised stock options in 2013 and 2012 are shown in the following table. 
Year ended December 31 (In millions)
2013
2012
Intrinsic value (A)
$
1.4

$
2.0

Cash received from stock options exercised
0.4

0.8

(A)
The difference between the market value on the date of exercise and the option exercise price.