Goodwill and Other Intangibles - Schedule of activity in goodwill (Details) - USD ($) $ in Millions	5 Months Ended	6 Months Ended		11 Months Ended	12 Months Ended
	Nov. 30, 2024	Nov. 30, 2025	Nov. 30, 2024	May 31, 2025	May 31, 2025	May 31, 2024
Goodwill [Line Items]
Gross goodwill				$ 238.5	$ 238.5	$ 172.4
Goodwill, Impaired, Accumulated Impairment Loss				(39.6)	(39.6)	$ (39.6)
Goodwill [Roll Forward]
Beginning balance		$ 198.9	$ 132.8		132.8
Additions		0.0
Foreign currency translation		(0.1)	(1.6)		1.9
Ending balance	$ 202.2	$ 198.8	202.2	198.9	$ 198.9
9 Story Media Group Inc.
Goodwill [Roll Forward]
Additions			$ 71.0
Additions				64.2
Measurement period adjustments	0.9			(5.9)
Increase (decrease) to acquired deferred tax liabilities	1.4			(5.3)
Increase (decrease) to acquired operating lease right of use assets	0.3			0.3
Increase (decrease) to acquired lease libailtiies	(0.1)			(0.1)
Step-up adjustment				0.1
Increase (decrease) to purchase price	$ (0.1)			$ (0.1)