Income Taxes - Components of Provision for (Recovery of) Income Tax and Income from Continuing Operations Before Income Tax (Details) - USD ($) $ in Millions		12 Months Ended
		Feb. 28, 2025	Feb. 29, 2024	Feb. 28, 2023
Income Tax Disclosure [Abstract]
Statutory Canadian tax rate	[1]	26.50%	26.50%	26.50%
Expected provision for (recovery of) income taxes from continuing operations		$ 2.3	$ 7.9	$ (53.5)
Differences in income taxes resulting from:
Valuation allowance		1.6	(3.3)	23.3
Investment tax credits		(8.1)	(10.0)	(10.5)
Change in unrecognized income tax benefits		(0.1)	(1.1)	0.7
Foreign tax rate differences		5.9	4.5	10.1
Non-deductible permanent difference		8.8	7.7	5.4
Goodwill impairment		0.0	4.2	29.7
Effective Income Tax Rate Reconciliation, Period Peroid Adjustments, Amount		(0.4)	8.6	4.0
Other differences		7.0	5.7	4.5
Provision for (recovery of) income taxes		$ 17.0	$ 24.2	$ 13.7

[1] (1) Our Canadian corporate tax rate is comprised of a basic Part I federal tax rate of 38%, net 15% after federal tax abatement and general tax reduction, plus the additional provincial tax of 11.5%.