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Stock-Based Compensation (Tables)

6 Months Ended

Nov. 30, 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   November 30,								Six months ended   November 30,
	2016				2015				2016				2015
Stock option expense	$	4.3			$	3.8			$	5.1			$	4.4
Restricted stock unit expense	0.7				0.7				1.4				1.4
Management stock purchase plan	0.4				0.6				0.4				0.6
Employee stock purchase plan	0.1				0.0				0.2				0.1
Total stock-based compensation expense	$	5.5			$	5.1			$	7.1			$	6.5

Schedule of Shares Issued Pursuant to Share-based Compensation Activity

The following table sets forth Common Stock issued pursuant to stock-based compensation plans as of the dates indicated: 

	Three months ended   November 30,						Six months ended   November 30,
	2016			2015			2016			2015
Common Stock issued pursuant to stock-based compensation  plans (in millions)	0.1			0.2			0.3			1.2

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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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- Definition

Tabular disclosure of share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value.

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