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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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_99&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 103 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_103&doctype=Standard -URIDate 2018-03-16 + Details
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