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Included in Profit/(Loss) Before Royalties and Taxation - Schedule of Amounts Included in Profit/(Loss) Before Royalties and Taxation (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Line items represents amounts included in profit before royalties and taxation [line items] |  |  |  |
Restructuring costs | [1] | $ 2.0 | $ 0.6 | $ 113.9
Income from submission of value added tax claims | [2] | 23.9 | 0.0 | 0.0
Salaries Norte [member] | Chilean tax authority [member] |  |  |  |
Line items represents amounts included in profit before royalties and taxation [line items] |  |  |  |
Income from submission of value added tax claims |  | 23.9 |  |
Tarkwa [member] |  |  |  |
Line items represents amounts included in profit before royalties and taxation [line items] |  |  |  |
Restructuring costs |  | 1.2 | 0.3 | 88.8
St Ives [member] |  |  |  |
Line items represents amounts included in profit before royalties and taxation [line items] |  |  |  |
Restructuring costs |  | 0.8 | 0.0 | 0.0
South deep [member] |  |  |  |
Line items represents amounts included in profit before royalties and taxation [line items] |  |  |  |
Restructuring costs |  | 0.0 | 0.3 | 11.2
Damang [member] |  |  |  |
Line items represents amounts included in profit before royalties and taxation [line items] |  |  |  |
Restructuring costs |  | $ 0.0 | $ 0.0 | $ 13.9
[1] | The restructuring costs in 2020 comprise mainly separation packages at Tarkwa amounting to US$1.2 million (2019: US$0.3 million and 2018: US$88.8 million), St Ives of US$0.8 million (2019: US$nil and 2018: US$nil), South Deep amounting to US$nil (2019: US$0.3 million and 2018: US$11.2 million) and Damang amounting to US$nil (2019: US$nil and 2018: US$13.9 million). The restructuring costs of US$88.8 million at Tarkwa in 2018 related to the transition to contractor mining.
[2] | The US$23.9 million income related to a submission of VAT claims for expenses incurred from 2010 to June 2020 at Salares Norte to the Chilean tax authority which become claimable from the commencement of construction in 2020.

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- Definition The amount of expense relating to restructuring. Restructuring is a programme that is planned and controlled by management and materially changes either the scope of a business undertaken by an entity or the manner in which that business is conducted. Such programmes include: (a) the sale or termination of a line of business; (b) closure of business locations in a country or region or the relocation of activities from one country or region to another; (c) changes in management structure; and (d) fundamental reorganisations that have a material effect on the nature and focus of the entity's operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 98 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_98_b&doctype=Standard -URIDate 2020-01-01 + Details
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