CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 30, 2025	Nov. 30, 2024	Nov. 30, 2025	Nov. 30, 2024
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 55.9	$ 48.8	$ (15.2)	$ (13.7)
Other comprehensive income (loss), net:
Foreign currency translation adjustments	(3.8)	(11.9)	(0.3)	(3.7)
Pension and postretirement adjustments (net of tax)	0.2	0.2	0.5	0.4
Other comprehensive income (loss)	(3.6)	(11.7)	0.2	(3.3)
Comprehensive income (loss)	$ 52.3	$ 37.1	$ (15.0)	$ (17.0)