Goodwill and Other Intangibles - Schedule of other intangible assets subject to amortization (Details) - USD ($) $ in Millions	6 Months Ended		12 Months Ended
	Nov. 30, 2024	Nov. 30, 2023	May 31, 2024
Finite-lived Intangible Assets [Roll Forward]
Beginning balance other intangibles subject to amortization	$ 8.2	$ 7.8	$ 7.8
Additions	85.3	5.8	6.0
Amortization expense	(5.4)	(1.2)	(2.6)
Foreign currency translation	(1.6)	0.0	0.1
Impairments	0.0	0.0	(3.1)
Total other intangibles subject to amortization, net of accumulated amortization of $24.8, $24.1 and $22.5, respectively	86.5	12.4	8.2
Accumulated amortization of intangible assets	44.5	37.7	39.1
Total other intangibles not subject to amortization	2.1	2.1	2.1
Total other intangibles	$ 88.6	$ 14.5	$ 10.3