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INVENTORIES - Summary of Inventories (Details) - CAD ($) $ in Millions	Mar. 31, 2020		Mar. 31, 2019
Inventories [Abstract]
Work in progress	$ 405.1		$ 342.4
Raw materials, supplies and manufactured products	211.1		194.6
Inventories	$ 616.2	[1]	$ 537.0
[1] Refer to Note 2 - Changes in accounting policies for the impact of adopting IFRS16.

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Inventories [Abstract]

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A classification of current inventory representing the amount of current raw materials and current production supplies. [Refer: Current production supplies; Current raw materials]

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The amount of current inventories. [Refer: Inventories]

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A classification of current inventory representing the amount of assets currently in production, which require further processes to be converted into finished goods or services. [Refer: Current finished goods; Inventories]

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