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Included in Profit Before Royalties and Taxation - Schedule of Amounts Included in Profit/(Loss) Before Royalties and Taxation (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of attribution of expenses by nature to their function [line items]      
Damang - contract termination $ 0.0 $ (1.1) $ (13.1)
Loss on buy-back of notes 0.0 0.0 (5.0)
Social contributions and sponsorships (18.1) (13.7) (18.0)
Rehabilitation expense (10.8) (1.5) (13.4)
Offshore structure costs (14.6) (13.6) (16.7)
Restructuring costs (1.3) (2.0) (0.6)
Salares VAT 0.0 23.9 0.0
Chilean tax authority | Salaries Norte      
Disclosure of attribution of expenses by nature to their function [line items]      
Salares VAT 23.9    
Tarkwa      
Disclosure of attribution of expenses by nature to their function [line items]      
Restructuring costs (1.3) (1.2) (0.3)
St Ives      
Disclosure of attribution of expenses by nature to their function [line items]      
Restructuring costs 0.0 (0.8) 0.0
South Deep      
Disclosure of attribution of expenses by nature to their function [line items]      
Restructuring costs $ 0.0 $ 0.0 $ (0.3)