CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 30, 2024	Nov. 30, 2023	Nov. 30, 2024	Nov. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 48.8	$ 76.9	$ (13.7)	$ 2.7
Other comprehensive income (loss), net:
Foreign currency translation adjustments	(11.9)	0.2	(3.7)	2.0
Pension and postretirement adjustments (net of tax)	0.2	0.1	0.4	0.3
Other comprehensive income (loss)	(11.7)	0.3	(3.3)	2.3
Comprehensive income (loss)	$ 37.1	$ 77.2	$ (17.0)	$ 5.0