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Debt - Schedule of Maturities of Long-term Debt (Details) - USD ($)
$ in Millions
May 31, 2021
May 31, 2020
Debt Disclosure [Abstract]    
Long-Term Debt, Maturity, Year One $ 182.9  
Long-Term Debt, Maturity, Year Two 7.3  
Long-Term Debt, Maturity, Year Three 0.0  
Long-Term Debt, Maturity, Year Four 0.0  
Long-Term Debt, Maturity, Year Five 0.0  
Long-Term Debt, Maturity, after Year Five 0.0  
Total debt $ 190.2 $ 218.5