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Taxes - Schedule of earnings from continuing operations before income taxes (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2025	May 31, 2024	May 31, 2023
Taxes (Details) - Schedule of earnings from continuing operations before income taxes [Line Items]
Earnings (loss) before income taxes	$ (1.3)	$ 16.2	$ 112.4
United States
Taxes (Details) - Schedule of earnings from continuing operations before income taxes [Line Items]
Earnings (loss) before income taxes	1.0	17.3	106.3
Non-United States
Taxes (Details) - Schedule of earnings from continuing operations before income taxes [Line Items]
Earnings (loss) before income taxes	$ (2.3)	$ (1.1)	$ 6.1

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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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