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Sale of Receivables (Details) - USD ($)
$ in Millions
3 Months Ended
Aug. 31, 2022
Aug. 31, 2021
May 31, 2022
Feb. 23, 2018
Sale of Receivables        
Amount collected $ 4.1   $ 5.4  
Purchase Agreement        
Sale of Receivables        
Retained interests 0.0      
Sale of receivables 43.4 $ 87.5    
Remitted receivables 43.5 95.9    
Amount collected 4.1   $ 5.4  
Maximum | Purchase Agreement        
Sale of Receivables        
Maximum amount of receivables sold       $ 150.0
Other income, net | Purchase Agreement        
Sale of Receivables        
Discount and other fees $ 0.1 $ 0.1