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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Environmental trust funds | $ 60.8 | $ 55.5 | $ 44.5
Trade receivables from provisional copper sales | 23.4 | 46.6 |
Redeemable preference shares | 132.9 |  |
Derivative financial assets | 9.3 | 5.5 |
Derivative financial liabilities | 22.6 | 3.3 |
Environmental trust funds [member] |  |  |
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Environmental trust funds | 6.5 | 7.3 |
Investments - listed [member] |  |  |
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Investments | 93.0 | 99.0 |
Investments - unlisted [member] |  |  |
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Investments | 0.1 | 0.1 |
Trade receivables from provisional copper concentrate sales [member] |  |  |
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Trade receivables from provisional copper sales | 15.3 | 21.2 |
Warrants [member] |  |  |
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Derivative financial assets | 9.3 | 5.5 |
Oil derivative contracts [member] |  |  |
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Derivative financial assets | 4.7 | 14.1 |
Copper derivative contracts [member] |  |  |
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Derivative financial assets | 1.2 |  |
Derivative financial liabilities | 0.0 | 3.3 |
Gold derivative contracts [member] |  |  |
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Derivative financial assets | 2.4 | 10.9 |
Derivative financial liabilities | 13.9 |  |
Foreign exchange derivatives [member] |  |  |
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Derivative financial liabilities | 8.7 |  |
Level 1 [member] | Investments - listed [member] |  |  |
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Investments | 93.0 | 99.0 |
Level 2 [member] | Environmental trust funds [member] |  |  |
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Environmental trust funds | 6.5 | 7.3 |
Level 2 [member] | Trade receivables from provisional copper concentrate sales [member] |  |  |
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Trade receivables from provisional copper sales | 15.3 | 21.2 |
Level 2 [member] | Warrants [member] |  |  |
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Derivative financial assets | 9.3 | 5.5 |
Level 2 [member] | Oil derivative contracts [member] |  |  |
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Derivative financial assets | 4.7 | 14.1 |
Level 2 [member] | Copper derivative contracts [member] |  |  |
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Derivative financial assets | 1.2 |  |
Derivative financial liabilities |  | 3.3 |
Level 2 [member] | Gold derivative contracts [member] |  |  |
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Derivative financial assets | 2.4 | 10.9 |
Derivative financial liabilities | 13.9 |  |
Level 2 [member] | Foreign exchange derivatives [member] |  |  |
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Derivative financial liabilities | 8.7 |  |
Level 3 [Member] |  |  |
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Redeemable preference shares | 132.9 |  |
Level 3 [Member] | Investments - unlisted [member] |  |  |
Disclosure of fair value measurement of assets and liability [line items] |  |  |
Investments | $ 0.1 | $ 0.1 |

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