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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]
The following table summarizes the Company's pre-tax compensation expense and related income tax benefit during the three and six months ended June 30, 2015 and 2014 related to the Company's performance units and restricted stock.
 
Three Months Ended June 30,
Six Months Ended June 30,
(In millions)
2015
2014
2015
2014
Performance units
 
 
 
 
Total shareholder return
$
1.9

$
1.9

$
3.8

$
3.9

Earnings per share
0.6

0.4

1.1

2.1

Total performance units
2.5

2.3

4.9

6.0

Restricted stock
0.1

—

0.1

0.1

Total compensation expense
2.6

2.3

5.0

6.1

Less: Amount paid by unconsolidated affiliates
0.2

0.7

0.5

1.9

Net compensation expense
$
2.4

$
1.6

$
4.5

$
4.2

Income tax benefit
$
1.0

$
0.6

$
1.8

$
1.6