CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 28, 2025	Feb. 29, 2024	Feb. 28, 2025	Feb. 29, 2024
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (3.6)	$ (26.5)	$ (17.3)	$ (23.8)
Other comprehensive income (loss), net:
Foreign currency translation adjustments	(8.0)	(0.4)	(11.7)	1.6
Pension and postretirement adjustments (net of tax)	0.1	0.2	0.5	0.5
Other comprehensive income (loss)	(7.9)	(0.2)	(11.2)	2.1
Comprehensive income (loss)	$ (11.5)	$ (26.7)	$ (28.5)	$ (21.7)