Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Aug. 31, 2025	May 31, 2025
Statement of Financial Position [Abstract]
Receivables, allowances	$ 0.4	$ 3.8
Accumulated amortization financing lease right of use assets	0.5	0.0
Other intangible assets, accumulated amortization	$ 52.4	$ 50.3
Preferred shares, without par value
Preferred shares, shares authorized	1,000,000	1,000,000
Preferred shares, shares issued	0	0
Preferred shares, shares outstanding	0	0
Common stock, without par value
Common shares, authorized	150,000,000	150,000,000
Common shares, shares issued	49,635,244	49,548,895
Common shares, shares outstanding	49,635,244	49,548,895
Accumulated other comprehensive income (loss), taxes	$ (2.0)	$ (2.0)