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Inventories - Schedule of Inventories (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Classes of current inventories [abstract]
Gold-in-process and stockpiles	$ 565.8	$ 450.2
Consumable stores	217.0	212.9
Total inventories	782.8	663.1
Heap leach and stockpiles inventories included in non-current assets	(155.2)	(141.5)
Total current inventories	627.6	521.6
Consumable stores	$ 319.6	$ 267.4	$ 270.4

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Carrying amount of consumable stores.

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Carrying amount of gold in process and stockpiles.

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The amount of inventories carried at net realisable value. [Refer: Inventories]

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The amount of assets: (a) held for sale in the ordinary course of business; (b) in the process of production for such sale; or (c) in the form of materials or supplies to be consumed in the production process or in the rendering of services. Inventories encompass goods purchased and held for resale including, for example, merchandise purchased by a retailer and held for resale, or land and other property held for resale. Inventories also encompass finished goods produced, or work in progress being produced, by the entity and include materials and supplies awaiting use in the production process. [Refer: Current finished goods; Current merchandise; Current work in progress; Land]

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The amount of non-current inventories. [Refer: Inventories]

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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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