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Financial Instruments and Risk Management (Details) - USD ($) $ in Millions	12 Months Ended
	Feb. 28, 2019	Feb. 28, 2018	Feb. 28, 2017
SG&A
Foreign Currency Risk and Currency Exchange Uncertainties
Net foreign exchange gains (losses), including the impact of currency hedges and currency swaps	$ 1.3	$ (3.1)	$ 0.5
Net sales revenue | Geographic concentration | International operations - transactions denominated in foreign currencies
Foreign Currency Risk and Currency Exchange Uncertainties
Concentration risk percentage	13.00%	13.00%	13.00%

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