Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2025	Aug. 31, 2024
Accumulated Other Comprehensive Loss
Balance	$ 1,211.6	$ 1,189.8
Balance	1,249.3	1,210.2
Currency Translation Adjustments
Accumulated Other Comprehensive Loss
Balance	(2.4)	(5.5)
Other comprehensive income	0.4	1.5
Balance	(2.0)	(4.0)
Pensions Plans
Accumulated Other Comprehensive Loss
Balance	(3.2)	(3.3)
Balance	(3.2)	(3.3)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Loss
Balance	(5.6)	(8.8)
Other comprehensive income	0.4	1.5
Balance	$ (5.2)	$ (7.3)