Taxes - Schedule of earnings from continuing operations before income taxes (Details) - USD ($) $ in Millions	12 Months Ended
May 31, 2026	May 31, 2025	May 31, 2024
Taxes (Details) - Schedule of earnings from continuing operations before income taxes [Line Items]
Earnings (loss) before income taxes	$ 85.2	$ (1.3)	$ 16.2
United States
Taxes (Details) - Schedule of earnings from continuing operations before income taxes [Line Items]
Earnings (loss) before income taxes	81.6	1.0	17.3
Non-United States
Taxes (Details) - Schedule of earnings from continuing operations before income taxes [Line Items]
Earnings (loss) before income taxes	$ 3.6	$ (2.3)	$ (1.1)

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