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Discontinued Operation - Summary of Assets and Liabilities of Discontinued Operation (Detail) - Darlot [Member] $ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2017 AUD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2017 AUD ($)
Disclosure Of Noncurrent Assets Held For Sale And Discontinued Operations [Line Items] |  |  |  |  |
Property, plant and equipment | $ 3.3 |  |  |  | $ 4.3
Inventories | 7.2 |  |  |  | 9.4
Trade and other receivables | 0.1 |  |  |  | 0.1
Trade and other payables | (8.7) |  |  |  | (11.3)
Environmental rehabilitation costs provision | (12.9) |  |  |  | (16.9)
Net liabilities | (11.0) |  |  |  | $ (14.4)
Total consideration received less costs to sell | 12.5 | $ 16.4 |  |  |
Gain on sale of discontinued operations | $ 23.5 | $ 30.8 | $ 0.0 | $ 0.0 |

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- Definition Disclosure Of Noncurrent Assets Held For Sale And Discontinued Operations [Line Items] + References No definition available. + Details
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- Definition Net Assets Liabilities Of Discontinued Operations. + References No definition available. + Details
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- Definition The gain (loss) recognised on the measurement to fair value less costs to sell or on the disposal of the assets or disposal group(s) constituting the discontinued operation. [Refer: Discontinued operations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 5 -IssueDate 2017-01-01 -Paragraph 33 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=5&date=2017-03-01&anchor=para_33_b_iii&doctype=Standard -URIDate 2017-03-09 + Details
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