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Debt - Schedule of Debt (Details) - USD ($) $ in Millions | Feb. 29, 2020 | May 31, 2019 | Feb. 28, 2019
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Total Debt | $ 16.1 | $ 7.3 | $ 11.0
Less lines of credit, short-term debt and current portion of long-term debt | (9.7) | (7.3) | (11.0)
Total long-term debt | 6.4 | 0.0 | 0.0
UK Long-term Debt |  |  |
Debt Instrument [Line Items] |  |  |
Total Debt | $ 6.4 | 0.0 | 0.0
Long-term Debt Weighted average interest rate (percentage) | 2.50% |  |
Revolving Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Total Debt | $ 0.0 | 0.0 | 0.0
Line of Credit | Secured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Total Debt | $ 9.7 | $ 7.3 | $ 11.0
Weighted average interest rate (percentage) | 4.60% | 4.10% | 4.30%

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