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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Environmental trust funds | $ 79.3 | $ 69.5 | $ 60.8
Derivative financial assets | 12.9 | 11.7 |
Derivative financial liabilities | 21.8 | 127.6 |
Borrowings | 1,526.9 | 1,845.8 |
Financial liabilities not measured at fair value [member] |  |  |
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Borrowings | 1,689.8 | 1,952.4 |
Investments - listed [member] | Financial assets measured at fair value [member] |  |  |
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Investments | 42.4 | 47.9 |
Environmental trust funds [member] | Financial assets measured at fair value [member] |  |  |
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Environmental trust funds | 7.4 | 7.2 |
Environmental trust funds [member] | Financial assets not measured at fair value [member] |  |  |
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Environmental trust funds | 71.9 | 62.3 |
Trade receivables from provisional copper concentrate sales [member] | Financial assets measured at fair value [member] |  |  |
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Trade receivables from provisional copper sales | 23.7 | 22.8 |
Asanko redeemable preference shares [member] | Financial assets measured at fair value [member] |  |  |
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Redeemable preference shares | 92.6 | 95.5 |
Warrants [member] | Financial assets measured at fair value [member] |  |  |
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Derivative financial assets | 12.9 | 11.7 |
Oil derivative contracts [member] | Financial liabilities measured at fair value [member] |  |  |
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Derivative financial liabilities | 15.1 | 0.0 |
Oil derivative contracts [member] | Financial assets measured at fair value [member] |  |  |
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Derivative financial assets | 0.0 | 1.1 |
Copper derivative contracts [member] | Financial liabilities measured at fair value [member] |  |  |
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Derivative financial liabilities | 14.0 | 0.0 |
Gold derivative contracts [member] | Financial liabilities measured at fair value [member] |  |  |
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Derivative financial liabilities | 0.0 | 127.3 |
Gold derivative contracts [member] | Financial assets measured at fair value [member] |  |  |
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Derivative financial assets | 27.3 | 0.0 |
Foreign Currency Derivative Contracts [Member] | Financial liabilities measured at fair value [member] |  |  |
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Derivative financial liabilities | 0.0 | 0.3 |
Foreign Currency Derivative Contracts [Member] | Financial assets measured at fair value [member] |  |  |
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Derivative financial assets | 86.0 | 0.0 |
Loan Advanced Contractor [Member] | Financial assets not measured at fair value [member] |  |  |
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Loan advanced - contractor | 68.4 | 0.0 |
Level 1 [member] | Financial liabilities not measured at fair value [member] |  |  |
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Borrowings | 1,156.3 | 1,700.4 |
Level 1 [member] | Investments - listed [member] | Financial assets measured at fair value [member] |  |  |
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Investments | 42.4 | 47.9 |
Level 2 [member] | Environmental trust funds [member] | Financial assets measured at fair value [member] |  |  |
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Environmental trust funds | 7.4 | 7.2 |
Level 2 [member] | Environmental trust funds [member] | Financial assets not measured at fair value [member] |  |  |
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Environmental trust funds | 71.9 | 62.3 |
Level 2 [member] | Trade receivables from provisional copper concentrate sales [member] | Financial assets measured at fair value [member] |  |  |
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Trade receivables from provisional copper sales | 23.7 | 22.8 |
Level 2 [member] | Warrants [member] | Financial assets measured at fair value [member] |  |  |
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Derivative financial assets | 12.9 | 11.7 |
Level 2 [member] | Oil derivative contracts [member] | Financial liabilities measured at fair value [member] |  |  |
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Derivative financial liabilities | 15.1 | 0.0 |
Level 2 [member] | Oil derivative contracts [member] | Financial assets measured at fair value [member] |  |  |
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Derivative financial assets | 0.0 | 1.1 |
Level 2 [member] | Copper derivative contracts [member] | Financial liabilities measured at fair value [member] |  |  |
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Derivative financial liabilities | 14.0 | 0.0 |
Level 2 [member] | Gold derivative contracts [member] | Financial liabilities measured at fair value [member] |  |  |
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Derivative financial liabilities | 0.0 | 127.3 |
Level 2 [member] | Gold derivative contracts [member] | Financial assets measured at fair value [member] |  |  |
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Derivative financial assets | 27.3 | 0.0 |
Level 2 [member] | Foreign Currency Derivative Contracts [Member] | Financial liabilities measured at fair value [member] |  |  |
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Derivative financial liabilities | 0.0 | 0.3 |
Level 2 [member] | Foreign Currency Derivative Contracts [Member] | Financial assets measured at fair value [member] |  |  |
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Derivative financial assets | 86.0 | 0.0 |
Level 3 [Member] | Financial liabilities not measured at fair value [member] |  |  |
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Borrowings | 533.5 | 252.0 |
Level 3 [Member] | Asanko redeemable preference shares [member] | Financial assets measured at fair value [member] |  |  |
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Redeemable preference shares | 92.6 | 95.5 |
Level 3 [Member] | Loan Advanced Contractor [Member] | Financial assets not measured at fair value [member] |  |  |
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Loan advanced - contractor | $ 68.4 | $ 0.0 |

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