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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of attribution of expenses by nature to their function [line items]      
Damang - contract termination $ 0.0 $ 0.0 $ (1.1)
Social contributions and sponsorships (18.5) (18.1) (13.7)
Rehabilitation expense 8.9 (10.8) (1.5)
Offshore structure costs (14.7) (14.6) (13.6)
Restructuring costs (11.3) (1.3) (2.0)
Yamana breakage fee, net of costs 300.0 0.0 0.0
Yamana transaction costs (33.0) 0.0 0.0
Salares VAT 0.0 0.0 23.9
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 (8.7) (1.3) (1.2)
Damang      
Disclosure of attribution of expenses by nature to their function [line items]      
Restructuring costs (2.6) 0.0 0.0
St Ives      
Disclosure of attribution of expenses by nature to their function [line items]      
Restructuring costs 0.0 $ 0.0 $ (0.8)
Yamana      
Disclosure of attribution of expenses by nature to their function [line items]      
Yamana breakage fee, net of costs 300.0    
Yamana transaction costs $ 33.0