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Stock Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
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, 2017, 2016 and 2015 related to the Company's performance units and restricted stock.
Year Ended December 31 (In millions)
2017
2016
2015
Performance units:
 
 
 
Total shareholder return
$
7.6

$
4.5

$
7.6

Earnings per share
1.4

—

0.7

Total performance units
9.0

4.5

8.3

Restricted stock
0.1

0.1

0.1

Total compensation expense
9.1

4.6

8.4

Less: Amount paid by unconsolidated affiliates
—

—

0.5

Net compensation expense
$
9.1

$
4.6

$
7.9

Income tax benefit
$
3.5

$
1.8

$
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.
 
2017
2016
2015
Number of units granted
260,570

284,211

264,454

Fair value of units granted
$
41.77

$
20.97

$
31.02

Expected dividend yield
3.8
%
3.5
%
2.6
%
Expected price volatility
19.9
%
19.8
%
16.9
%
Risk-free interest rate
1.44
%
0.88
%
0.91
%
Expected life of units (in years)
2.80

2.84

2.85
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. 
 
2017
2016
2015
Number of units granted
86,857

94,735

88,156

Fair value of units granted
$
34.83

$
26.64

$
33.99
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. 
 
2017
2016
2015
Shares of restricted stock granted
3,145

1,881

958

Fair value of restricted stock granted
$
34.96

$
29.27

$
26.11
Share-based Compensation, Activity [Table Text Block]
A summary of the activity for the Company's performance units and restricted stock at December 31, 2017 and changes in 2017 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 12/31/16
664,045

 
 
221,350

 
 
4,912

 
Granted
260,570

(A)
 
86,857

(A)
 
3,145

 
Converted
(185,214
)
(B)
$
—

(61,742
)
(B)
$
—

N/A

 
Vested
N/A

 
 
N/A

 
 
(3,815
)
$
0.1

Forfeited
(14,850
)
 
 
(4,947
)
 
 
—

 
Units/shares outstanding at 12/31/17
724,551

 
$
2.4

241,518

 
$
7.2

4,242

$
0.1

Units/shares fully vested at 12/31/17
201,431

 
$
—

67,148

 
$
1.2

 
 
(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 zero percent to 200 percent of the target.
(B)
These amounts represent performance units that vested at December 31, 2016 which were settled in February 2017.
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, 2017 and changes in 2017 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 12/31/16
478,831

 
$
25.16

159,608

 
$
29.71

4,912

$
31.29

Granted
260,570

(A)
$
41.77

86,857

(A)
$
34.83

3,145

$
34.96

Vested
(201,431
)
 
$
31.18

(67,148
)
 
$
33.99

(3,815
)
$
31.71

Forfeited
(14,850
)
 
$
31.01

(4,947
)
 
$
31.12

—

$
—

Units/shares non-vested at 12/31/17
523,120

 
$
30.96

174,370

 
$
30.58

4,242

$
33.58

Units/shares expected to vest
492,446

(B)
 
164,148

(B)
 
4,242

 
(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 zero 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 $2.3 million and $5.7 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)
2017
2016
2015
Performance units:
 
 
 
Total shareholder return
$
6.3

$
6.4

$
8.5

Earnings per share
1.2

—

—

Restricted stock
0.1

0.1

0.2
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, 2017
Unrecognized Compensation Cost (In millions)
Weighted Average to be Recognized (In years)
Performance units:
 
 
Total shareholder return
$
8.5

1.75
Earnings per share
2.6

1.67
Total performance units
11.1

 
Restricted stock
0.1

1.34
Total
$
11.2