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Financial Instruments - Summary of Assets and Liabilities Measured at Fair Value by Level within Fair Value Hierarchy (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of fair value measurement of assets and liability [line items]      
Environmental trust funds $ 88.1 $ 79.3 $ 69.5
Warrants 0.0 12.9  
Derivative financial liabilities 6.8 21.8  
Borrowings 1,078.1 1,526.9  
Financial liabilities not measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Borrowings 1,191.6 1,689.8  
Investments – listed | Financial assets measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Investments – listed 30.9 42.4  
Environmental trust funds | Financial assets measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Environmental trust funds 2.9 7.4  
Environmental trust funds | Financial assets not measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Environmental trust funds 85.2 71.9  
Trade receivables from provisional copper sales | Financial assets measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Trade receivables from provisional copper sales 25.8 23.7  
Asanko redeemable preference shares | Financial assets measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Asanko redeemable preference shares 94.5 92.6  
Warrants | Financial assets measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Warrants 0.0 12.9  
Gold derivative contracts | Financial assets measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Warrants 0.0 27.3  
Oil derivative contracts | Financial liabilities measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Derivative financial liabilities 0.0 15.1  
Oil derivative contracts | Financial assets measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Warrants 5.1 0.0  
Foreign currency derivative contracts | Financial liabilities measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Derivative financial liabilities 6.8 0.0  
Foreign currency derivative contracts | Financial assets measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Warrants 0.0 86.0  
Copper derivative contracts | Financial liabilities measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Derivative financial liabilities 0.0 14.0  
Loan advanced – contractor | Financial assets not measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Loan advanced - contractor 27.3 68.4  
Level 1 | Financial liabilities not measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Borrowings 1,108.1 1,156.3  
Level 1 | Investments – listed | Financial assets measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Investments – listed 30.9 42.4  
Level 1 | Environmental trust funds | Financial assets measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Environmental trust funds 0.0 0.0  
Level 1 | Environmental trust funds | Financial assets not measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Environmental trust funds 0.0 0.0  
Level 1 | Trade receivables from provisional copper sales | Financial assets measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Trade receivables from provisional copper sales 0.0 0.0  
Level 1 | Asanko redeemable preference shares | Financial assets measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Asanko redeemable preference shares 0.0 0.0  
Level 1 | Warrants | Financial assets measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Warrants 0.0 0.0  
Level 1 | Gold derivative contracts | Financial assets measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Warrants 0.0 0.0  
Level 1 | Oil derivative contracts | Financial liabilities measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Derivative financial liabilities 0.0 0.0  
Level 1 | Oil derivative contracts | Financial assets measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Warrants 0.0 0.0  
Level 1 | Foreign currency derivative contracts | Financial liabilities measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Derivative financial liabilities 0.0 0.0  
Level 1 | Foreign currency derivative contracts | Financial assets measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Warrants 0.0 0.0  
Level 1 | Copper derivative contracts | Financial liabilities measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Derivative financial liabilities 0.0 0.0  
Level 1 | Loan advanced – contractor | Financial assets not measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Loan advanced - contractor 0.0  
Level 2 | Financial liabilities not measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Borrowings 0.0 0.0  
Level 2 | Investments – listed | Financial assets measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Investments – listed 0.0 0.0  
Level 2 | Environmental trust funds | Financial assets measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Environmental trust funds 2.9 7.4  
Level 2 | Environmental trust funds | Financial assets not measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Environmental trust funds 85.2 71.9  
Level 2 | Trade receivables from provisional copper sales | Financial assets measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Trade receivables from provisional copper sales 25.8 23.7  
Level 2 | Asanko redeemable preference shares | Financial assets measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Asanko redeemable preference shares 0.0 0.0  
Level 2 | Warrants | Financial assets measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Warrants 0.0 12.9  
Level 2 | Gold derivative contracts | Financial assets measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Warrants 0.0 27.3  
Level 2 | Oil derivative contracts | Financial liabilities measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Derivative financial liabilities 0.0 15.1  
Level 2 | Oil derivative contracts | Financial assets measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Warrants 5.1 0.0  
Level 2 | Foreign currency derivative contracts | Financial liabilities measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Derivative financial liabilities 6.8 0.0  
Level 2 | Foreign currency derivative contracts | Financial assets measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Warrants 0.0 86.0  
Level 2 | Copper derivative contracts | Financial liabilities measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Derivative financial liabilities 0.0 14.0  
Level 2 | Loan advanced – contractor | Financial assets not measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Loan advanced - contractor 0.0 0.0  
Level 3 | Financial liabilities not measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Borrowings 83.5 533.5  
Level 3 | Investments – listed | Financial assets measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Investments – listed 0.0 0.0  
Level 3 | Environmental trust funds | Financial assets measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Environmental trust funds 0.0 0.0  
Level 3 | Environmental trust funds | Financial assets not measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Environmental trust funds 0.0 0.0  
Level 3 | Trade receivables from provisional copper sales | Financial assets measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Trade receivables from provisional copper sales 0.0 0.0  
Level 3 | Asanko redeemable preference shares | Financial assets measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Asanko redeemable preference shares 94.5 92.6  
Level 3 | Warrants | Financial assets measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Warrants 0.0 0.0  
Level 3 | Gold derivative contracts | Financial assets measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Warrants 0.0 0.0  
Level 3 | Oil derivative contracts | Financial liabilities measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Derivative financial liabilities 0.0 0.0  
Level 3 | Oil derivative contracts | Financial assets measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Warrants 0.0 0.0  
Level 3 | Foreign currency derivative contracts | Financial liabilities measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Derivative financial liabilities 0.0 0.0  
Level 3 | Foreign currency derivative contracts | Financial assets measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Warrants 0.0 0.0  
Level 3 | Copper derivative contracts | Financial liabilities measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Derivative financial liabilities 0.0 0.0  
Level 3 | Loan advanced – contractor | Financial assets not measured at fair value      
Disclosure of fair value measurement of assets and liability [line items]      
Loan advanced - contractor $ 27.3 $ 68.4