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Stock-Based Compensation
 9 Months Ended
Sep. 30, 2018
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 nine months ended September 30, 2018 and 2017 related to the Company's performance units and restricted stock.
 
Three Months Ended September 30,
Nine Months Ended September 30,
(In millions)
2018
2017
2018
2017
Performance units:
 
 
 
 
Total shareholder return
$
2.0

$
1.6

$
6.1

$
4.9

Earnings per share
1.9

(1.4
)
3.6

(0.2
)
Total performance units
3.9

0.2

9.7

4.7

Restricted stock
—

0.1

—

0.1

Total compensation expense
$
3.9

$
0.3

$
9.7

$
4.8

Income tax benefit
$
1.0

$
0.1

$
2.5

$
1.9



During the three and nine months ended September 30, 2018, the Company issued an immaterial number of shares of new common stock pursuant to the Company's Stock Incentive Plan to satisfy restricted stock grants and payouts of earned performance units.