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Sale of Receivables (Details) - USD ($)
$ in Millions
3 Months Ended
Feb. 23, 2018
Aug. 31, 2021
Aug. 31, 2020
May 31, 2021
Sale of Receivables        
Retained interests   $ 0.0    
Sale of receivables   87.5 $ 129.0  
Remitted receivables   95.9 147.6  
Restricted cash   3.8   $ 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