Goodwill and Other Intangibles - Schedule of other intangible assets subject to amortization (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Aug. 31, 2024	May 31, 2024	Feb. 28, 2025	Feb. 29, 2024	May 31, 2024
Finite-lived Intangible Assets [Roll Forward]
Beginning balance other intangibles subject to amortization	$ 8.2	$ 11.9	$ 8.2	$ 7.8	$ 7.8
Additions	6.0		85.3	6.0
Amortization expense	(2.6)		(8.1)	(1.9)
Foreign currency translation	0.1		(4.1)	0.0
Impairments	$ (3.1)	(3.1)	0.0	0.0
Total other intangibles subject to amortization, net of accumulated amortization of $24.8, $24.1 and $22.5, respectively		8.2	81.3	11.9	8.2
Accumulated amortization of intangible assets		39.1	47.2	38.4	39.1
Total other intangibles not subject to amortization		2.1	2.1	2.1	2.1
Total other intangibles		$ 10.3	$ 83.4	$ 14.0	$ 10.3