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Debt - Schedule of Debt (Details) - USD ($)
$ in Millions
Nov. 30, 2021
May 31, 2021
Nov. 30, 2020
Debt Instrument [Line Items]      
Total Debt $ 14.3 $ 190.2 $ 194.8
Less lines of credit, short-term debt and current portion of long-term debt (14.3) (182.9) (19.8)
Total long-term debt 0.0 7.3 175.0
UK Loan      
Debt Instrument [Line Items]      
Total Debt 6.8 7.3 11.4
Revolving Credit Facility      
Debt Instrument [Line Items]      
Total Debt 0.0 175.0 175.0
Line of Credit | Unsecured Debt      
Debt Instrument [Line Items]      
Total Debt $ 7.5 $ 7.9 $ 8.4
Weighted average interest rate (percentage) 4.70% 4.70% 4.40%