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Stock-Based Compensation (Tables)

9 Months Ended

Feb. 29, 2016

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

Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan

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

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- References

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- Definition

Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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