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Cost of Sale - Summary of Cost of Sale (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of cost of sales [line items] |  |  |  |  |
Increase in amortisation and depreciation | $ 748.1 | $ 671.4 | [1] | $ 591.5 | [1]
Increase in amortisation | 5.7 |  |  |  |
Cerro corona [member] |  |  |  |  |
Disclosure of cost of sales [line items] |  |  |  |  |
Increase in amortisation and depreciation | 24.5 |  |  |  |
Australia [member] |  |  |  |  |
Disclosure of cost of sales [line items] |  |  |  |  |
Increase in amortisation and depreciation | 298.1 | $ 273.6 |  | $ 233.4 |
Increase in amortisation | $ 5.7 |  |  |  |
[1] | As Restated - Refer note 40 for further details.

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