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Discontinued Operation - Summary of Results of Discontinued Operation (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) | Dec. 31, 2017 AUD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Disclosure Of Noncurrent Assets Held For Sale And Discontinued Operations [Line Items] |  |  |  |  |  |
(Loss)/profit for the year from operating activities | $ 13.1 |  | $ 1.2 | [1] | $ (8.2) | [1]
Profit/(loss) attributable to owners of the parent from discontinued operations | 13.1 |  | 1.2 | [1] | (8.2) | [1]
Darlot [Member] |  |  |  |  |  |
Disclosure Of Noncurrent Assets Held For Sale And Discontinued Operations [Line Items] |  |  |  |  |  |
Revenue | 49.0 |  | 83.1 |  | 91.3 |
Cost of sales | (50.7) |  | (72.1) |  | (85.0) |
Cost of sales before gold inventory change and amortisation and depreciation | (46.3) |  | (57.3) |  | (59.8) |
Gold inventory change | (0.9) |  | (0.4) |  | 0.6 |
Amortisation and depreciation | (3.5) |  | (14.4) |  | (25.8) |
Other costs, net | (1.9) |  | (7.2) |  | (16.0) |
(Loss)/profit before royalties and taxation | (3.6) |  | 3.8 |  | (9.7) |
Royalties | (1.1) |  | (2.0) |  | (2.1) |
(Loss)/profit before taxation | (4.7) |  | 1.8 |  | (11.8) |
Mining and income taxation | 1.4 |  | (0.6) |  | 3.6 |
(Loss)/profit for the year from operating activities | (3.3) |  | 1.2 |  | (8.2) |
Gain on sale of discontinued operation | 23.5 | $ 30.8 | 0.0 |  | 0.0 |
Income tax on gain on sale of discontinued operation | (7.1) |  | 0.0 |  | 0.0 |
Profit/(loss) attributable to owners of the parent from discontinued operations | $ 13.1 |  | $ 1.2 |  | $ (8.2) |
[1] | As Restated - Refer note 40 for further details.

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