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Stock-Based Compensation
 9 Months Ended
Feb. 28, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Disclosure of Compensation Related Costs, Share-based Payments
Stock-Based Compensation
 
The following table summarizes stock-based compensation expense included in Selling, general and administrative expenses for the periods indicated: 
 
Three months ended February 28,
 
Nine months ended February 28,
 
2014
 
2013
 
2014
 
2013
Stock option expense
$
0.8

 
$
0.4

 
$
5.4

 
$
2.0

Restricted stock unit expense
0.2

 
0.6

 
2.1

 
2.4

Management stock purchase plan
—

 
—

 
0.1

 
0.6

Employee stock purchase plan
0.1

 
—

 
0.2

 
0.2

Total stock-based compensation expense
$
1.1

 
$
1.0

 
$
7.8

 
$
5.2


 
During each of the nine month periods ended February 28, 2014 and 2013, approximately 0.4 million shares of Common Stock were issued by the Corporation pursuant to its stock-based compensation plans.