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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of attribution of expenses by nature to their function [line items]      
Social contributions and sponsorships $ (19.4) $ (18.5) $ (18.1)
Rehabilitation expense (4.0) 8.9 (10.8)
Offshore structure costs (18.6) (14.7) (14.6)
Restructuring costs (7.8) (11.3) (1.3)
Audit fee (3.5) (3.9) (3.2)
Non-audit services fee (0.4) (0.5) (0.1)
Yamana breakage fee, net of costs 0.0 300.0 0.0
Yamana transaction costs 0.0 (33.0) 0.0
Tarkwa      
Disclosure of attribution of expenses by nature to their function [line items]      
Restructuring costs (1.6) (8.7) (1.3)
Damang      
Disclosure of attribution of expenses by nature to their function [line items]      
Restructuring costs (5.5) (2.6) 0.0
St Ives      
Disclosure of attribution of expenses by nature to their function [line items]      
Restructuring costs $ (0.7) 0.0 $ 0.0
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