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Capital Stock - Subsequent event (Details) - USD ($) $ in Millions	3 Months Ended
	May 31, 2026	May 31, 2025	Jun. 22, 2026	Feb. 28, 2026
Equity [Abstract]
Common outstanding (in shares)	586,061,407			587,431,120
Class of Stock [Line Items]
Common outstanding (in shares)	586,061,407			587,431,120
Stock Repurchased During Period, Shares	2,600,000
Common shares repurchased (note 6)	$ (10.0)	$ (10.0)
Capital Stock and Additional Paid-in Capital
Equity [Abstract]
Common outstanding (in shares)	586,061,000			587,431,000
Class of Stock [Line Items]
Common outstanding (in shares)	586,061,000			587,431,000
Stock Repurchased During Period, Shares	2,587,000
1.75% Debenture
Class of Stock [Line Items]
Conversion of stock (in shares)	51,500,000
Voting Common Stock [Member] \| Subsequent Event [Member]
Equity [Abstract]
Common outstanding (in shares)			586,000,000
Class of Stock [Line Items]
Common outstanding (in shares)			586,000,000
Restricted Share Units (RSUs) \| Subsequent Event [Member]
Equity [Abstract]
Common outstanding (in shares)			20,000,000.0
Class of Stock [Line Items]
Common outstanding (in shares)			20,000,000.0
Deferred Share Unit \| Subsequent Event [Member]
Equity [Abstract]
Common outstanding (in shares)			1,800,000
Class of Stock [Line Items]
Common outstanding (in shares)			1,800,000