Treasury Stock - Schedule of repurchase of common stock (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended	8 Months Ended
	Nov. 30, 2023	Aug. 31, 2023	Nov. 30, 2022	Aug. 31, 2022	Nov. 30, 2023	Nov. 30, 2023	Jul. 19, 2023	Mar. 22, 2023
Equity, Class of Treasury Stock [Line Items]
Authorized amount of stock to be repurchased	$ 150.0				$ 150.0	$ 150.0	$ 100.0
Less repurchases made under these authorizations	(52.3)	$ (36.2)	$ (26.0)	$ (5.1)	(88.5)
Remaining Board authorization at November 30, 2023	$ 33.8				$ 33.8	33.8
Board Authorized 2023 Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Authorized amount of stock to be repurchased								$ 50.0
Board Authorized 2024 Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Authorized amount of stock to be repurchased							$ 100.0
Under all Board Authorizations
Equity, Class of Treasury Stock [Line Items]
Less repurchases made under these authorizations						$ (116.2)