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Stock-Based Compensation Plans (Tables)
 9 Months Ended
Sep. 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 
 September 30,
 
For the Nine Months Ended 
 September 30,
 
 
2018
 
2017
 
2018
 
2017
Restricted stock
 
$
0.7

 
$
0.8

 
$
2.1

 
$
2.2

Restricted stock units
 
2.0

 
2.1

 
5.7

 
6.1

Total
 
$
2.7

 
$
2.9

 
$
7.8

 
$
8.3