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Cost of Sale - Summary of Cost of Sale (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Analysis of income and expense [abstract]
Salaries and wages	$ (397.8)	$ (352.5)	$ (334.8)
Consumable stores	(319.6)	(267.4)	(270.4)
Utilities	(134.1)	(121.3)	(131.5)
Mine contractors	(628.2)	(575.3)	(511.0)
Other	(304.8)	(238.1)	(218.8)
Cost of sales before gold inventory change and amortisation and depreciation	(1,784.5)	(1,554.6)	(1,466.5)
Gold inventory change	122.8	65.5	43.0
Cost of sales before amortisation and depreciation	(1,661.7)	(1,489.1)	(1,423.5)
Amortisation and depreciation	(713.2)	(661.3)	(610.0)
Total cost of sales	$ (2,374.9)	$ (2,150.4)	$ (2,033.5)

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The amount of all expenses directly or indirectly attributed to the goods or services sold. Attributed expenses include, but are not limited to, costs previously included in the measurement of inventory that has now been sold, such as depreciation and maintenance of factory buildings and equipment used in the production process, unallocated production overheads, and abnormal amounts of production costs of inventories.

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