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Stock Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2015
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, 2015, 2014 and 2013 related to the Company's performance units and restricted stock.
Year ended December 31 (In millions)
2015
2014
2013
Performance units
 
 
 
Total shareholder return
$
7.6

$
8.3

$
8.4

Earnings per share
0.7

3.7

2.3

Total performance units
8.3

12.0

10.7

Restricted stock
0.1

—

0.4

Total compensation expense
8.4

12.0

11.1

Less: Amount paid by unconsolidated affiliates
0.5

3.6

3.1

Net compensation expense
$
7.9

$
8.4

$
8.0

Income tax benefit
$
3.1

$
3.3

$
3.1
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.
 
2015
2014
2013
Number of units granted
264,454

219,106

316,162

Fair value of units granted
$
31.02

$
34.80

$
25.89

Expected dividend yield
2.6
%
2.5
%
2.8
%
Expected price volatility
16.9
%
20.0
%
20.0
%
Risk-free interest rate
0.91
%
0.67
%
0.37
%
Expected life of units (in years)
2.85

2.86

2.84
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. 
 
2015
2014
2013
Number of units granted
88,156

73,037

74,570

Fair value of units granted
$
33.99

$
34.81

$
26.73
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. 
 
2015
2014
2013
Shares of restricted stock granted
958

7,037

5,940

Fair value of restricted stock granted
$
26.11

$
35.71

$
29.71
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, 2015 and changes in 2015 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 12/31/14
892,991

 
 
297,687

 
 
12,501

 
Granted
264,454

(A)
 
88,156

(A)
 
958

 
Converted
(343,395
)
(B)
$
0.2

(114,366
)
(B)
$
4.9

N/A

 
Vested
N/A

 
 
N/A

 
 
(4,772
)
$
0.1

Forfeited
(89,992
)
 
 
(30,007
)
 
 
(1,064
)
 
Units/Shares Outstanding at 12/31/15
724,058

 
$
—

241,470

 
$
—

7,623

$
0.3

Units/Shares Fully Vested at 12/31/15
327,115

 
$
—

109,154

 
$
—

 
 
(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, 2014 which were settled in February 2015.
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, 2015 and changes in 2015 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 12/31/14
556,844

 
$
29.38

185,737

 
$
29.90

12,501

$
32.65

Granted
264,454

(A)
$
31.02

88,156

(A)
$
33.99

958

$
26.11

Converted
(7,248
)
(B)
$
28.95

(2,416
)
(B)
$
28.95

N/A

N/A

Vested
(327,115
)
 
$
25.89

(109,154
)
 
$
26.73

(4,772
)
$
32.33

Forfeited
(89,992
)
 
$
31.48

(30,007
)
 
$
32.95

(1,064
)
$
25.87

Units/Shares Non-Vested at 12/31/15
396,943

 
$
32.83

132,316

 
$
34.30

7,623

$
29.68

Units/Shares Expected to Vest
390,820

(C)
 
130,274

(C)
 
7,623

 
(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)
Units paid out under terms of plan to member on long-term disability.
(C)
There is no intrinsic value of the performance units based on total shareholder return and earnings per share.
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)
2015
2014
2013
Performance units
 
 
 
Total shareholder return
$
8.5

$
9.5

$
8.2

Earnings per share
—

3.8

4.9

Restricted stock
0.2

0.2

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, 2015
Unrecognized Compensation Cost (in millions)
Weighted Average to be Recognized (in years)
Performance units
 
 
Total shareholder return
$
6.7

1.68
Earnings per share
2.4

1.69
Total performance units
9.1

 
Restricted stock
0.1

1.60
Total
$
9.2

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

Cash received from stock options exercised
0.4

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