Stock-Based Compensation

3 Months Ended

Feb. 28, 2013

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

10. 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 28, 2013		February 29, 2012		February 28, 2013		February 29, 2012
Stock option expense	$	0.4	$	1.2	$	2.0	$	6.0
Restricted stock unit expense		0.6		1.0		2.4		3.6
Management stock purchase plan		0.0		0.0		0.6		0.2
Employee stock purchase plan		0.0		0.0		0.2		0.2
Total stock-based compensation expense	$	1.0	$	2.2	$	5.2	$	10.0

During each of the three and nine-month periods ended February 28, 2013 and February 29, 2012, shares of Common Stock issued by the Corporation pursuant to its stock-based compensation plans were not material.