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Stock-Based Compensation Plans (Tables)
 6 Months Ended
Jun. 30, 2018
Share-based Compensation [Abstract]  
Schedule of Stock Based Compensation Expense
Stock-based compensation expense consists of the following:
(In millions)
 
For the Three Months Ended 
 June 30,
 
For the Six Months Ended 
 June 30,
 
 
2018
 
2017
 
2018
 
2017
Restricted stock
 
$
0.7

 
$
0.7

 
$
1.4

 
$
1.4

Restricted stock units
 
1.3

 
2.2

 
3.7

 
4.0

Total
 
$
2.0

 
$
2.9

 
$
5.1

 
$
5.4