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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Disclosure of detailed information about financial instruments [line items] |  |  |  |
- Borrowings | $ 2,011.6 | $ 1,781.5 |  |
- Trade and other payables | 393.1 | 451.0 |  |
- Finance lease liabilities | 111.5 |  |  |
- Environmental trust funds | 60.8 | 55.5 | $ 44.5 |
- Trade and other receivables | 153.2 | 201.9 |  |
- Investments | 235.3 | 104.6 |  |
- Cash and cash equivalents | 399.7 | 479.0 | $ 526.7 | $ 440.0
- Warrants | 9.3 | 5.5 |  |
Fair Value [member] | Financial liabilities at fair value [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
- Copper derivative contracts | 22.6 | 3.3 |  |
Total | 22.6 | 3.3 |  |
Fair Value [member] | Financial liabilities not measured at fair value [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
- Borrowings | 2,001.8 | 1,805.1 |  |
- Trade and other payables | 393.1 | 451.0 |  |
- Finance lease liabilities | 88.6 |  |  |
Total | 2,483.5 | 2,256.1 |  |
Fair Value [member] | Financial assets at fair value [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
- Environmental trust funds | 6.5 | 7.3 |  |
- Trade receivables from provisional copper sales | 15.3 | 21.2 |  |
- Investments | 93.1 | 99.1 |  |
Asanko redeemable preference shares | 132.9 |  |  |
- Warrants | 9.3 | 5.5 |  |
- Gold and oil derivative contracts | 8.3 | 25.0 |  |
Total | 265.4 | 158.1 |  |
Fair Value [member] | Financial assets not measured at fair value [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
- Environmental trust funds | 54.3 | 48.2 |  |
- Trade and other receivables | 64.2 | 45.3 |  |
- Cash and cash equivalents | 399.7 | 479.0 |  |
Total | 518.2 | 572.5 |  |
Carrying amount [member] | Financial liabilities at fair value [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
- Copper derivative contracts | 22.6 | 3.3 |  |
Total | 22.6 | 3.3 |  |
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] |  |  |  |
- Copper derivative contracts | 22.6 | 0.0 |  |
Total | 22.6 | 0.0 |  |
Carrying amount [member] | Financial liabilities at fair value [member] | Derivative instruments [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
- Copper derivative contracts |  | 3.3 |  |
Total |  | 3.3 |  |
Carrying amount [member] | Financial liabilities not measured at fair value [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
- Borrowings | 2,011.6 | 1,781.5 |  |
- Trade and other payables | 393.1 | 451.0 |  |
- Finance lease liabilities | 88.6 |  |  |
Total | 2,493.3 | 2,232.5 |  |
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 | 2,011.6 |  |  |
- Trade and other payables | 393.1 |  |  |
- Finance lease liabilities | 88.6 |  |  |
Total | 2,493.3 |  |  |
Carrying amount [member] | Financial liabilities not measured at fair value [member] | Other Financial Instruments [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
- Borrowings |  | 1,781.5 |  |
- Trade and other payables |  | 451.0 |  |
Total |  | 2,232.5 |  |
Carrying amount [member] | Financial assets at fair value [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
- Environmental trust funds | 6.5 | 7.3 |  |
- Trade receivables from provisional copper sales | 15.3 | 21.2 |  |
- Investments | 93.1 | 99.1 |  |
Asanko redeemable preference shares | 132.9 |  |  |
- Warrants | 9.3 | 5.5 |  |
- Gold and oil derivative contracts | 8.3 | 25.0 |  |
Total | 265.4 | 158.1 |  |
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] |  |  |  |
- Environmental trust funds | 6.5 | 7.3 |  |
- Trade receivables from provisional copper sales | 15.3 | 21.2 |  |
- Investments | 0.0 | 0.0 |  |
Asanko redeemable preference shares | 0.0 |  |  |
- Warrants | 9.3 | 0.0 |  |
- Gold and oil derivative contracts | 8.3 | 0.0 |  |
Total | 39.4 | 28.5 |  |
Carrying amount [member] | Financial assets at fair value [member] | FVOCI [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
- Environmental trust funds | 0.0 |  |  |
- Trade receivables from provisional copper sales | 0.0 |  |  |
- Investments | 93.1 |  |  |
Asanko redeemable preference shares | 132.9 |  |  |
- Warrants | 0.0 |  |  |
- Gold and oil derivative contracts | 0.0 |  |  |
Total | 226.0 |  |  |
Carrying amount [member] | Financial assets at fair value [member] | Available for sale [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
- Environmental trust funds |  | 0.0 |  |
- Trade receivables from provisional copper sales |  | 0.0 |  |
- Investments |  | 99.1 |  |
- Warrants |  | 0.0 |  |
- Gold and oil derivative contracts |  | 0.0 |  |
Total |  | 99.1 |  |
Carrying amount [member] | Financial assets at fair value [member] | Derivative instruments [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
- Environmental trust funds |  | 0.0 |  |
- Trade receivables from provisional copper sales |  | 0.0 |  |
- Investments |  | 0.0 |  |
- Warrants |  | 5.5 |  |
- Gold and oil derivative contracts |  | 25.0 |  |
Total |  | 30.5 |  |
Carrying amount [member] | Financial assets not measured at fair value [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
- Environmental trust funds | 54.3 | 48.2 |  |
- Trade and other receivables | 64.2 | 45.3 |  |
- Cash and cash equivalents | 399.7 | 479.0 |  |
Total | 518.2 | 572.5 |  |
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 | 54.3 |  |  |
- Trade and other receivables | 64.2 |  |  |
- Cash and cash equivalents | 399.7 |  |  |
Total | $ 518.2 |  |  |
Carrying amount [member] | Financial assets not measured at fair value [member] | Loans and receivables [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
- Environmental trust funds |  | 48.2 |  |
- Trade and other receivables |  | 45.3 |  |
- Cash and cash equivalents |  | 479.0 |  |
Total |  | $ 572.5 |  |

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