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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2017
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 months ended March 31, 2017 and 2016 related to the Company's performance units and restricted stock.
 
Three Months Ended March 31,
(In millions)
2017
2016
Performance units
 
 
Total shareholder return
$
1.5

$
1.1

Earnings per share
0.6

0.6

Total performance units
2.1

1.7

Restricted stock
—

—

Total compensation expense
2.1

1.7

Income tax benefit
$
0.8

$
0.6
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]

The following table summarizes the activity of the Company's stock-based compensation during the three months ended March 31, 2017.
 
Units/Shares
Fair Value
Per Share
Grants
 
 
Performance units (Total shareholder return)
260,570

$
41.77

Performance units (Earnings per share)
86,857

$
34.95