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Sale of Receivables (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Feb. 23, 2018
Feb. 28, 2022
Feb. 28, 2021
Feb. 28, 2022
Feb. 28, 2021
May 31, 2021
Sale of Receivables            
Sale of receivables       $ 225.5 $ 346.0  
Retained interests   $ 0.0   0.0    
Remitted receivables       246.1 371.9  
Restricted cash   2.4   2.4   $ 8.4
Maximum            
Sale of Receivables            
Sale of receivables $ 150.0          
Other expense, net            
Sale of Receivables            
Discount and other fees   $ 0.1 $ 0.1 $ 0.2 $ 0.3