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Stock-Based Compensation
 6 Months Ended
Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]
Stock-Based Compensation

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, 2017 and 2016 related to the Company's performance units and restricted stock.
 
Three Months Ended June 30,
Six Months Ended June 30,
(In millions)
2017
2016
2017
2016
Performance units
 
 
 
 
Total shareholder return
$
1.8

$
1.1

$
3.3

$
2.2

Earnings per share
0.6

0.4

1.2

1.0

Total performance units
2.4

1.5

4.5

3.2

Restricted stock
—

0.1

—

0.1

Total compensation expense
$
2.4

$
1.6

$
4.5

$
3.3

Income tax benefit
$
1.0

$
0.7

$
1.8

$
1.3



During the three and six months ended June 30, 2017, the Company issued an immaterial number of shares to satisfy restricted stock grants.