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Sale of Receivables (Details) - USD ($)
$ in Millions
3 Months Ended
Aug. 31, 2020
Aug. 31, 2019
May 31, 2020
Feb. 23, 2018
Sale of Receivables        
Sale of receivables $ 129.0 $ 199.0    
Retained interests 0.0      
Remitted receivables 147.6 199.0    
Restricted cash 6.4   $ 20.0  
Maximum        
Sale of Receivables        
Sale of receivables       $ 150.0
Other expense, net        
Sale of Receivables        
Discount and other fees $ 0.1 $ 0.6