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Inventories - Schedule of Inventories (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Classes of current inventories [abstract]
Consumable stores	$ 267.4	$ 270.4	$ 280.0

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- Definition

The amount of raw materials and consumables used in the production process or in the rendering of services. [Refer: Current raw materials]

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