Stock-Based Compensation

9 Months Ended

Feb. 28, 2023

Share-based Payment Arrangement [Abstract]

Stock-Based Compensation

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,
	2023		2022		2023		2022
Stock option expense	$	0.7	$	0.6	$	3.7	$	3.1
Restricted stock unit expense		1.4		0.9		3.7		2.5
Management stock purchase plan		0.1		0.0		0.5		0.3
Employee stock purchase plan		0.1		0.1		0.3		0.2
Total stock-based compensation expense	$	2.3	$	1.6	$	8.2	$	6.1

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,
	2023	2022	2023	2022
Common Stock issued pursuant to stock-based compensation plans (in millions)	0.1	0.3	0.7	0.6