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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
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.