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Stock-Based Compensation
 3 Months Ended
Aug. 31, 2022
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
August 31,
 20222021
Stock option expense$0.6 $0.7 
Restricted stock unit expense1.0 0.7 
Management stock purchase plan0.0 0.0 
Employee stock purchase plan0.1 0.1 
Total stock-based compensation expense$1.7 $1.5 

The following table sets forth Common Stock issued pursuant to stock-based compensation plans for the periods indicated:
 Three months ended
August 31,
 20222021
Common Stock issued pursuant to stock-based compensation plans (in millions)0.3 0.1