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Consolidated Statement of Changes in Stockholders Equity (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	May 31, 2023	May 31, 2022	May 31, 2021
Statement of Stockholders' Equity [Abstract]
Pension and postretirement adjustments, tax portion	$ 0.0	$ 0.3	$ 2.2
Net income (loss)	86.5	81.0	(10.9)
Purchases of treasury stock at cost	$ (135.1)	$ (33.4)	$ 0.0

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