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Cost of Sale - Summary of Cost of Sale (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of cost of sales [abstract]
Salaries and wages	$ (392.8)	$ (414.7)	$ (388.1)
Consumable stores	(280.0)	(346.7)	(346.3)
Utilities	(148.3)	(150.1)	(169.8)
Mine contractors	(365.3)	(307.4)	(308.4)
Other	(204.4)	(207.6)	(163.1)
Cost of sales before gold inventory change and amortisation and depreciation	(1,390.8)	(1,426.5)	(1,375.7)
Gold inventory change	16.2	69.5	45.9
Cost of sales before amortisation and depreciation	(1,374.6)	(1,357.0)	(1,329.8)
Amortisation and depreciation	(668.4)	(748.1)	(671.4)
Total cost of sales	$ (2,043.0)	$ (2,105.1)	$ (2,001.2)

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The costs of mine contractors used in the production process or in the rendering of services.

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The amount of costs relating to expenses directly or indirectly attributed to the goods or services sold, which may include, but are not limited to, costs previously included in the measurement of inventory that has now been sold, unallocated production overheads and abnormal amounts of production costs of inventories.

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The amount of depreciation and amortisation expense. Depreciation and amortisation are the systematic allocations of depreciable amounts of assets over their useful lives.

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