Stock-Based Compensation

9 Months Ended

Feb. 29, 2016

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

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				Nine months ended
	February 29,		February 28,		February 29,		February 28,
	2016		2015		2016		2015
Stock option expense	$	0.8	$	0.8	$	5.2	$	5.4
Restricted stock unit expense	0.7		0.6		2.1		1.9
Management stock purchase plan	0.0		0.1		0.6		0.7
Employee stock purchase plan	0.1		0.1		0.2		0.2
Total stock-based compensation expense	$	1.6	$	1.6	$	8.1	$	8.2

During the three month periods ended February 29, 2016 and February 28, 2015, respectively, less than 0.1 million and 0.1 million shares of Common Stock were issued by the Corporation pursuant to its stock-based compensation plans. For the nine month periods ended February 29, 2016 and February 28, 2015, respectively, approximately 1.2 million and 0.6 million shares of Common Stock were issued by the Corporation pursuant to its stock-based compensation plans.

For the three and nine month periods ended February 28, 2015, total stock-based compensation expense included $0.2 and $0.8, respectively, of expenses recognized in discontinued operations.