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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Stock-Based Compensation Expense by Type of Award
Total stock-based compensation expense (benefit) by type of award was as follows:
 
Three months ended March 31,
 
Three months ended February 28,
 
One month ended December 31,
 
2016
 
2015
 
2015
 
(In millions)
Stock appreciation rights
$
0.4

 
$
2.5

 
$
(1.4
)
Stock options
0.2

 
0.1

 
0.1

Restricted shares, service based
0.8

 
1.7

 
0.3

Restricted shares, performance based
0.8

 
1.0

 
0.6

Employee Stock Purchase Plan
0.1

 
—

 
—

Total stock-based compensation expense (benefit)
$
2.3

 
$
5.3

 
$
(0.4
)