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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
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, 2018 and 2017 related to the Company's performance units and restricted stock.
 
Three Months Ended June 30,
Six Months Ended June 30,
(In millions)
2018
2017
2018
2017
Performance units:
 
 
 
 
Total shareholder return
$
2.1

$
1.8

$
4.1

$
3.3

Earnings per share
1.0

0.6

1.7

1.2

Total performance units
3.1

2.4

5.8

4.5

Restricted stock
—

—

—

—

Total compensation expense
$
3.1

$
2.4

$
5.8

$
4.5

Income tax benefit
$
0.8

$
1.0

$
1.5

$
1.8