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Revenues - Allowance for Credit Losses (Details) - USD ($)
$ in Millions
12 Months Ended
May 31, 2021
May 31, 2020
May 31, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance $ 19.9    
Current period provision 5.2 $ 15.6 $ 7.0
Write-offs and other (3.7)    
Ending balance $ 21.4 $ 19.9