Goodwill and Other Intangibles - Schedule of activity in goodwill (Details) - USD ($) $ in Millions	8 Months Ended	9 Months Ended		12 Months Ended
	Feb. 28, 2025	Feb. 28, 2025	Feb. 29, 2024	May 31, 2024	May 31, 2023
Goodwill [Line Items]
Gross goodwill				$ 172.4	$ 172.3
Goodwill, Impaired, Accumulated Impairment Loss				(39.6)	$ (39.6)
Goodwill [Roll Forward]
Beginning balance		$ 132.8	$ 132.7	132.7
Additions			0.0	0.0
Foreign currency translation		(3.8)	0.1	0.1
Ending balance	$ 200.0	200.0	132.8	132.8
9 Story Media Group Inc.
Goodwill [Roll Forward]
Additions		$ 70.1
Measurement period adjustments	0.9		0.0	0.0
Measurement period adjustments	0.9		$ 0.0	$ 0.0
Increase (decrease) to acquired deferred tax liabilities	1.4
Increase (decrease) to acquired operating lease right of use assets	0.3
Increase (decrease) to acquired lease libailtiies	(0.1)
Increase (decrease) to purchase price	$ (0.1)