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Inventories - Schedule of Inventories (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of inventories [abstract]
Consumable stores	$ 280.0	$ 346.7	$ 346.3

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- Definition

Disclosure Of Inventories [Abstract]

+ References

No definition available.

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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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