Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	May 31, 2025	May 31, 2024
Statement of Financial Position [Abstract]
Receivables, allowances	$ 3.8	$ 3.2
Other intangible assets, accumulated amortization	$ 50.3	$ 45.3
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	49,548,895	49,331,514
Common shares, shares outstanding	49,548,895	49,331,514
Accumulated other comprehensive loss, taxes	$ (2.0)	$ (1.7)