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Goodwill and Other Intangibles - Schedule of activity in goodwill (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Aug. 31, 2024	Aug. 31, 2023	May 31, 2024	May 31, 2023
Goodwill [Roll Forward]
Gross goodwill			$ 172.4	$ 172.3
Goodwill, Impaired, Accumulated Impairment Loss			(39.6)	(39.6)
Goodwill	$ 204.4	$ 132.8	132.8	$ 132.7
Additions		0.0	0.0
Foreign currency translation	1.5	0.1	0.1
Impairments	$ 0.0	$ 0.0	$ (3.1)

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Amount of other decrease (increase) in the carrying value of finite lived intangible assets that is not separately disclosed.

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