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Financial Instruments - Summary of Carrying Amounts and Fair Values of Financial Assets and Financial Liabilities (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Disclosure of detailed information about financial instruments [line items] |  |  |  |
- Borrowings | $ 1,526.9 | $ 1,845.8 |  |
- Trade and other payables | 452.0 | 385.3 |  |
- Lease liabilities | 429.0 | 332.9 | $ 88.6 |
- Environmental trust funds | 79.3 | 69.5 | 60.8 |
- Trade and other receivables | 240.1 | 136.0 |  |
- Investments | 147.9 | 155.1 |  |
- Cash and cash equivalents | 886.8 | 515.0 | $ 219.7 | $ 393.8
- Warrants | 12.9 | 11.7 |  |
Fair Value [member] | Financial liabilities at fair value [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
- Gold and foreign exchange derivative contracts |  | 127.6 |  |
- Copper and oil derivative contracts | 29.1 |  |  |
Total | 29.1 | 127.6 |  |
Fair Value [member] | Financial liabilities not measured at fair value [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
- Borrowings | 1,689.8 | 1,952.4 |  |
- Trade and other payables | 452.0 | 385.3 |  |
- Lease liabilities | 429.0 | 332.9 |  |
Total | 2,570.8 | 2,670.6 |  |
Fair Value [member] | Financial assets at fair value [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
- Gold and foreign exchange derivative contracts | 113.3 |  |  |
- Environmental trust funds | 7.4 | 7.2 |  |
- Trade and other receivables | 23.7 | 22.8 |  |
- Investments | 42.4 | 47.9 |  |
Asanko redeemable preference shares | 92.6 | 95.5 |  |
- Warrants | 12.9 | 11.7 |  |
- Oil derivative contracts |  | 1.1 |  |
Total | 292.3 | 186.2 |  |
Fair Value [member] | Financial assets not measured at fair value [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
- Environmental trust funds | 71.9 | 62.3 |  |
- Loan advanced - contractor | 68.4 |  |  |
- Trade and other receivables | 29.5 | 51.4 |  |
- Cash and cash equivalents | 886.8 | 515.0 |  |
Total | 1,056.6 | 628.7 |  |
Carrying amount [member] | Financial liabilities at fair value [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
- Gold and foreign exchange derivative contracts |  | 127.6 |  |
- Copper and oil derivative contracts | 29.1 |  |  |
Total | 29.1 | 127.6 |  |
Carrying amount [member] | Financial liabilities at fair value [member] | Fair value through profit or loss [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
- Gold and foreign exchange derivative contracts |  | 127.6 |  |
- Copper and oil derivative contracts | 29.1 |  |  |
Total | 29.1 | 127.6 |  |
Carrying amount [member] | Financial liabilities not measured at fair value [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
- Borrowings | 1,526.9 | 1,845.8 |  |
- Trade and other payables | 452.0 | 385.3 |  |
- Lease liabilities | 429.0 | 332.9 |  |
Total | 2,407.9 | 2,564.0 |  |
Carrying amount [member] | Financial liabilities not measured at fair value [member] | Other financial liabilities measured at amortised cost, category [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
- Borrowings | 1,526.9 | 1,845.8 |  |
- Trade and other payables | 452.0 | 385.3 |  |
- Lease liabilities | 429.0 | 332.9 |  |
Total | 2,407.9 | 2,564.0 |  |
Carrying amount [member] | Financial assets at fair value [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
- Gold and foreign exchange derivative contracts | 113.3 |  |  |
- Environmental trust funds | 7.4 | 7.2 |  |
- Trade and other receivables | 23.7 | 22.8 |  |
- Investments | 42.4 | 47.9 |  |
Asanko redeemable preference shares | 92.6 | 95.5 |  |
- Warrants | 12.9 | 11.7 |  |
- Oil derivative contracts |  | 1.1 |  |
Total | 292.3 | 186.2 |  |
Carrying amount [member] | Financial assets at fair value [member] | Fair value through profit or loss [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
- Gold and foreign exchange derivative contracts | 113.3 |  |  |
- Environmental trust funds | 7.4 | 7.2 |  |
- Trade and other receivables | 23.7 | 22.8 |  |
- Warrants | 12.9 | 11.7 |  |
- Oil derivative contracts |  | 1.1 |  |
Total | 157.3 | 42.8 |  |
Carrying amount [member] | Financial assets at fair value [member] | FVOCI [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
- Investments | 42.4 | 47.9 |  |
Asanko redeemable preference shares | 92.6 | 95.5 |  |
Total | 135.0 | 143.4 |  |
Carrying amount [member] | Financial assets not measured at fair value [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
- Environmental trust funds | 71.9 | 62.3 |  |
- Loan advanced - contractor | 68.4 |  |  |
- Trade and other receivables | 29.5 | 51.4 |  |
- Cash and cash equivalents | 886.8 | 515.0 |  |
Total | 1,056.6 | 628.7 |  |
Carrying amount [member] | Financial assets not measured at fair value [member] | Amortised cost [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
- Environmental trust funds | 71.9 | 62.3 |  |
- Trade and other receivables | 29.5 | 51.4 |  |
- Cash and cash equivalents | 886.8 | 515.0 |  |
Total | 1,056.6 | $ 628.7 |  |
Carrying amount [member] | Financial assets at amortised cost, class [member] | Financial liabilities not measured at fair value [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
- Loan advanced - contractor | $ 68.4 |  |  |

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