Capital Stock - Subsequent event (Details) - shares	6 Months Ended
	Aug. 31, 2021	Sep. 20, 2021	Feb. 28, 2021
Equity [Abstract]
Common outstanding (in shares)	566,994,978		565,505,328
Class of Stock [Line Items]
Common outstanding (in shares)	566,994,978		565,505,328
1.75% Debenture
Class of Stock [Line Items]
Conversion of stock (in shares)	60,800,000
Voting Common Stock [Member] | Subsequent Event [Member]
Equity [Abstract]
Common outstanding (in shares)		567,000,000
Class of Stock [Line Items]
Common outstanding (in shares)		567,000,000
Employee Stock Option [Member] | Subsequent Event [Member]
Equity [Abstract]
Common outstanding (in shares)		1,000,000
Class of Stock [Line Items]
Common outstanding (in shares)		1,000,000
Restricted Share Units (RSUs) | Subsequent Event [Member]
Equity [Abstract]
Common outstanding (in shares)		20,000,000
Class of Stock [Line Items]
Common outstanding (in shares)		20,000,000
Deferred Share Unit | Subsequent Event [Member]
Equity [Abstract]
Common outstanding (in shares)		1,000,000
Class of Stock [Line Items]
Common outstanding (in shares)		1,000,000