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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2019
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, 2019 and 2018 related to the Company's performance units and restricted stock.
 
Three Months Ended March 31,
(In millions)
2019
2018
Performance units:
 
 
Total shareholder return
$
2.2

$
2.0

Earnings per share
0.5

0.7

Total performance units
2.7

2.7

Restricted stock
0.3

—

Total compensation expense
$
3.0

$
2.7

Income tax benefit
$
0.8

$
0.7