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Risk Management Activities - Summary of gain loss from derivative financial instruments (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Loss on financial instruments $ (100.4) $ (238.9) $ (238.0)
Market risk      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Loss on financial instruments (100.4) (238.9) (238.0)
South Deep gold hedge | Market risk      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Loss on financial instruments 0.0 (84.7) (25.8)
Ghana gold hedge | Market risk      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Loss on financial instruments 0.0 (78.1) (36.6)
Ghana oil hedge | Market risk      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Loss on financial instruments 13.4 (16.9) 2.5
Peru copper hedge | Market risk      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Loss on financial instruments (31.8) (14.0) 0.0
Australia gold hedge | Market risk      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Loss on financial instruments (25.6) (129.6) (178.8)
Australia oil hedge | Market risk      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Loss on financial instruments 7.6 (8.9) 2.3
Australia foreign currency hedge | Market risk      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Loss on financial instruments 0.0 (0.3) (7.2)
Salares Norte foreign currency hedge | Market risk      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Loss on financial instruments (60.0) 91.2 0.0
Maverix warrants – gain on fair value | Market risk      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Loss on financial instruments (4.0) 1.3 4.2
Gain on fair value on disposal of Maverix | Market risk      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Loss on financial instruments 0.0 0.0 2.5
Other | Market risk      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Loss on financial instruments 0.0 1.1 (1.1)
Unrealised (loss)/gain and prior year mark-to-market reversals on derivative contracts | Market risk      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Loss on financial instruments (53.0) 176.4 (112.6)
Realised loss on derivative contracts | Market risk      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Loss on financial instruments $ (43.4) $ (416.6) $ (132.1)