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INVENTORIES - Summary of Inventories (Details) - CAD ($) $ in Millions	Mar. 31, 2021	Mar. 31, 2020
Inventories [Abstract]
Work in progress	$ 446.0	$ 405.1
Raw materials, supplies and manufactured products	201.8	211.1
Total inventories	$ 647.8	$ 616.2

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- Definition

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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