Taxes - Schedule of earnings from continuing operations before income taxes (Details) - USD ($) $ in Millions	12 Months Ended
May 31, 2022	May 31, 2021	May 31, 2020
Taxes (Details) - Schedule of earnings from continuing operations before income taxes [Line Items]
Earnings (loss) from continuing operations before income taxes	$ 89.7	$ (18.2)	$ (89.7)
United States
Taxes (Details) - Schedule of earnings from continuing operations before income taxes [Line Items]
Earnings (loss) from continuing operations before income taxes	76.9	(45.8)	(92.5)
Non-United States
Taxes (Details) - Schedule of earnings from continuing operations before income taxes [Line Items]
Earnings (loss) from continuing operations before income taxes	$ 12.8	$ 27.6	$ 2.8

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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+ Details