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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2016
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, 2016 and 2015 related to the Company's performance units and restricted stock.
 
Three Months Ended September 30,
Nine Months Ended September 30,
(In millions)
2016
2015
2016
2015
Performance units
 
 
 
 
Total shareholder return
$
1.2

$
1.9

$
3.4

$
5.7

Earnings per share
(1.3
)
(0.8
)
(0.3
)
0.3

Total performance units
(0.1
)
1.1

3.1

6.0

Restricted stock
—

—

0.1

0.1

Total compensation expense
(0.1
)
1.1

3.2

6.1

Less: Amount paid by unconsolidated affiliates
—

(0.2
)
—

0.3

Net compensation expense
$
(0.1
)
$
1.3

$
3.2

$
5.8

Income tax benefit
$
—

$
0.5

$
1.3

$
2.3