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Stock-Based Compensation
 3 Months Ended
Aug. 31, 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
August 31,
 20232022
Stock option expense$0.6 $0.6 
Restricted stock unit expense1.5 1.0 
Management stock purchase plan0.0 0.0 
Employee stock purchase plan0.2 0.1 
Total stock-based compensation expense$2.3 $1.7 

The following table sets forth Common Stock issued pursuant to stock-based compensation plans for the periods indicated:
 Three months ended
August 31,
 20232022
Common Stock issued pursuant to stock-based compensation plans (in millions)0.1 0.3