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Stock-Based Compensation Plans (Tables)
 3 Months Ended
Mar. 31, 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 
 March 31,
 
 
2018
 
2017
Restricted stock
 
$
0.7

 
$
0.7

Restricted stock units
 
2.4

 
1.8

Total
 
$
3.1

 
$
2.5