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Sale of Receivables (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Feb. 29, 2020
Feb. 28, 2019
Feb. 29, 2020
Feb. 28, 2019
May 31, 2019
Feb. 23, 2018
Sale of Receivables            
Sale of receivables $ 588.8 $ 547.6 $ 588.8 $ 547.6    
Retained interests 0.0   0.0      
Remitted receivables     589.4 519.8    
Restricted cash 27.9   27.9   $ 19.8  
Maximum            
Sale of Receivables            
Sale of receivables           $ 150.0
Other expense, net            
Sale of Receivables            
Discount and other fees $ 0.4 $ 0.6 $ 1.5 $ 1.6