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Sale of Receivables (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Nov. 30, 2019
Nov. 30, 2018
Nov. 30, 2019
Nov. 30, 2018
May 31, 2019
Feb. 23, 2018
Sale of Receivables            
Sale of receivables $ 404.8 $ 351.0 $ 404.8 $ 351.0    
Retained interests 0.0   0.0      
Remitted receivables     405.3 327.5    
Restricted cash 14.5   14.5   $ 19.8  
Maximum            
Sale of Receivables            
Sale of receivables           $ 150.0
Other expense, net            
Sale of Receivables            
Discount and other fees $ 0.5 $ 0.6 $ 1.1 $ 1.0