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Financial Instruments - Summary of Financial Instruments (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | [2]
--- | --- | --- | --- | --- | ---
Financial assets [Abstract] |  |  |  |  |  |
Environmental trust fund | $ 55.5 | $ 44.5 | [1] | $ 35.0 |  |
Trade and other receivables | 201.9 | 170.2 | [1] |  |  |
Cash and cash equivalents | 479.0 | 526.7 | [1],[2] | $ 440.0 | [2] | $ 458.0
Fair value through profit or loss |  |  |  |  |  |
Trade receivables from provisional copper concentrate sales | 21.2 | 10.6 |  |  |  |
Available for sale [Abstract] |  |  |  |  |  |
Investments | 99.1 | 13.8 |  |  |  |
Copper derivative contracts | 3.3 | 0.0 | [1] |  |  |
Financial liabilities [Abstract] |  |  |  |  |  |
Borrowings | 1,781.5 | 1,692.9 |  |  |  |
Trade and other payables | 451.0 | 459.3 |  |  |  |
South Deep dividend | 6.4 | 6.4 |  |  |  |
Trades and Other Payables [Member] |  |  |  |  |  |
Financial assets [Abstract] |  |  |  |  |  |
Trade and other receivables | 45.3 | 57.9 |  |  |  |
Warrant [Member] |  |  |  |  |  |
Available for sale [Abstract] |  |  |  |  |  |
Derivative Instruments | 5.5 | 5.9 |  |  |  |
Gold and Oil Derivative Contracts [Member] |  |  |  |  |  |
Available for sale [Abstract] |  |  |  |  |  |
Derivative Instruments | $ 25.0 | $ 0.0 |  |  |  |
[1] | As Restated - Refer note 40 for further details.
[2] | The restatement is as a result of the discontinued operations.

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