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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Stock-Based Compensation Expense by Type of Award
Total stock-based compensation expense by type of award was as follows:
 
Three months ended March 31,
 
2018
 
2017
 
(In millions)
Stock appreciation rights
$
(0.9
)
 
$
2.4

Stock options
0.1

 
0.4

Restricted shares, service based
1.0

 
1.2

Restricted shares, performance based
1.1

 
2.6

Employee stock purchase plan
0.2

 
0.2

Total stock-based compensation expense
$
1.5

 
$
6.8