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Treasury Stock - Schedule of repurchase of common stock (Details) - USD ($) $ in Millions	3 Months Ended		17 Months Ended
	Aug. 31, 2025	Aug. 31, 2024	Aug. 31, 2025	Mar. 19, 2025	Mar. 20, 2024
Equity, Class of Treasury Stock [Line Items]
Authorized amount of stock to be repurchased	$ 108.0		$ 108.0
Less repurchases made under these authorizations		$ (5.0)
Remaining Board authorization at August 31, 2025	70.0		70.0
Board Authorized 2024 Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Authorized amount of stock to be repurchased					$ 54.6
Under all Board Authorizations
Equity, Class of Treasury Stock [Line Items]
Less repurchases made under these authorizations	$ 0.0		$ (38.0)
Board Authorized March 2025 Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Authorized amount of stock to be repurchased				$ 53.4