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Taxes (Details) - Schedule of earnings from continuing operations before income taxes - USD ($) $ in Millions | 12 Months Ended
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May 31, 2019 | May 31, 2018 | May 31, 2017
Taxes (Details) - Schedule of earnings from continuing operations before income taxes [Line Items] |  |  |
Earnings (loss) from continuing operations before income taxes | $ 26.0 | $ (1.5) | $ 87.9
United States [Member] |  |  |
Taxes (Details) - Schedule of earnings from continuing operations before income taxes [Line Items] |  |  |
Earnings (loss) from continuing operations before income taxes | 8.7 | (18.4) | 78.7
Non-United States [Member] |  |  |
Taxes (Details) - Schedule of earnings from continuing operations before income taxes [Line Items] |  |  |
Earnings (loss) from continuing operations before income taxes | $ 17.3 | $ 16.9 | $ 9.2

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