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Sale of Receivables (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Nov. 30, 2020
Nov. 30, 2019
Nov. 30, 2020
Nov. 30, 2019
May 31, 2020
Feb. 23, 2018
Sale of Receivables            
Retained interests $ 0.0   $ 0.0      
Sale of receivables 243.1 $ 404.8 243.1 $ 404.8    
Remitted receivables     268.5 405.3    
Restricted cash 3.0   3.0   $ 20.0  
Maximum            
Sale of Receivables            
Sale of receivables           $ 150.0
Other expense, net            
Sale of Receivables            
Discount and other fees $ 0.1 $ 0.5 $ 0.2 $ 1.1