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Sale of Receivables (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Feb. 28, 2021
Feb. 29, 2020
Feb. 28, 2021
Feb. 29, 2020
May 31, 2020
Feb. 23, 2018
Sale of Receivables            
Retained interests $ 0.0   $ 0.0      
Sale of receivables 346.0 $ 588.8 346.0 $ 588.8    
Remitted receivables     371.9 589.4    
Restricted cash 13.4   13.4   $ 20.0  
Maximum            
Sale of Receivables            
Sale of receivables           $ 150.0
Other expense, net            
Sale of Receivables            
Discount and other fees $ 0.1 $ 0.4 $ 0.3 $ 1.5