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Risk Management Activities - Summary of gain loss from derivative financial instruments (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Gain/(loss) on financial instruments $ 0.0 $ 24.0 $ (100.4)
Market risk      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Gain/(loss) on financial instruments 0.0 24.0 (100.4)
Ghana oil hedge | Market risk      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Gain/(loss) on financial instruments 0.0 13.5 13.4
Peru copper hedge | Market risk      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Gain/(loss) on financial instruments 0.0 0.0 (31.8)
Australia gold hedge | Market risk      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Gain/(loss) on financial instruments 0.0 0.0 (25.6)
Australia oil hedge | Market risk      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Gain/(loss) on financial instruments 0.0 8.4 7.6
Salares Norte foreign currency hedge | Market risk      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Gain/(loss) on financial instruments 0.0 2.1 (60.0)
Maverix warrants – gain on fair value | Market risk      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Gain/(loss) on financial instruments 0.0 0.0 (4.0)
Unrealised gain/(loss) and prior year mark-to-market reversals on derivative contracts | Market risk      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Gain/(loss) on financial instruments 0.0 1.8 (53.0)
Realised gain/(loss) on derivative contracts | Market risk      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Gain/(loss) on financial instruments $ 0.0 $ 22.2 $ (43.4)