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Stock-Based Compensation

9 Months Ended

Feb. 28, 2022

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,				February 28,
	2022		2021		2022		2021
Stock option expense	$	0.6	$	0.7	$	3.1	$	3.5
Restricted stock unit expense		0.9		0.7		2.5		1.4
Management stock purchase plan		0.0		0.0		0.3		0.0
Employee stock purchase plan		0.1		0.1		0.2		0.2
Total stock-based compensation expense	$	1.6	$	1.5	$	6.1	$	5.1

The following table sets forth Common Stock issued pursuant to stock-based compensation plans for the periods indicated:


	Three months ended		Nine months ended
	February 28,		February 28,
	2022	2021	2022	2021
Common Stock issued pursuant to stock-based compensation plans (in millions)	0.3	0.1	0.6	0.2