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Fair Value of Assets and Liabilities - Summary of Estimated Fair Values of the Group's Financial Assets and Liabilities (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | [2]
--- | --- | --- | --- | --- | ---
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Cash and cash equivalents | $ 479.0 | $ 526.7 | [1],[2] | $ 440.0 | [2] | $ 458.0
Trade and other receivables | 201.9 | 170.2 | [1] |  |  |
Gold and oil derivative contracts | 25.0 | 0.0 |  |  |  |
Environmental trust fund | 55.5 | 44.5 | [1] | $ 35.0 |  |
Investments | 104.6 | 19.7 | [1] |  |  |
Trade and other payables | 548.5 | 543.3 | [1] |  |  |
Borrowings | 1,587.9 | 1,504.9 | [1] |  |  |
Current portion of borrowings | 193.6 | 188.0 | [1] |  |  |
Copper derivative contracts | 3.3 | 0.0 | [1] |  |  |
South Deep dividend | 6.4 | 6.4 |  |  |  |
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Cash and cash equivalents | 479.0 | 526.7 |  |  |  |
Trade and other receivables | 66.5 | 68.5 |  |  |  |
Gold and oil derivative contracts | 25.0 | 0.0 |  |  |  |
Environmental trust fund | 55.5 | 44.5 |  |  |  |
Investments | 104.6 | 19.7 |  |  |  |
Trade and other payables | 451.0 | 459.3 |  |  |  |
Borrowings | 1,611.5 | 1,496.7 |  |  |  |
Current portion of borrowings | 193.6 | 188.0 |  |  |  |
Copper derivative contracts | 3.3 | 0.0 |  |  |  |
South Deep dividend | 6.4 | 6.4 |  |  |  |
Carrying amount [member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Cash and cash equivalents | 479.0 | 526.7 |  |  |  |
Trade and other receivables | 66.5 | 68.5 |  |  |  |
Gold and oil derivative contracts | 25.0 | 0.0 |  |  |  |
Environmental trust fund | 55.5 | 44.5 |  |  |  |
Investments | 104.6 | 19.7 |  |  |  |
Trade and other payables | 451.0 | 459.3 |  |  |  |
Borrowings | 1,587.9 | 1,504.9 |  |  |  |
Current portion of borrowings | 193.6 | 188.0 |  |  |  |
Copper derivative contracts | 3.3 | 0.0 |  |  |  |
South Deep dividend | $ 6.4 | $ 6.4 |  |  |  |
[1] | As Restated - Refer note 40 for further details.
[2] | The restatement is as a result of the discontinued operations.

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