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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2013
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 nine months ended September 30, 2013 and 2012 related to the Company's performance units and restricted stock.
 
Three Months Ended
Nine Months Ended
 
September 30,
September 30,
(In millions)
2013
2012
2013
2012
Performance units
 
 
 
 
Total shareholder return
$
2.5

$
1.9

$
6.4

$
5.7

Earnings per share
0.6

0.7

1.9

2.0

Total performance units
3.1

2.6

8.3

7.7

Restricted stock
0.1

0.1

0.3

0.5

Total compensation expense
3.2

2.7

8.6

8.2

Less: Amount paid by unconsolidated affiliates
1.4

—

2.0

—

Net compensation expense
$
1.8

$
2.7

$
6.6

$
8.2

Income tax benefit
$
0.7

$
1.0

$
2.6

$
3.2