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Assets Held for Sale - Assets Held for Sale (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | [1]
Assets Held For Sale [Line Items] |  |  |  |
Impairment loss |  | $ 7.6 |  |
Carrying value | $ 4,892.9 | 4,524.6 | [1] | $ 4,295.6
Damang Mining Fleet and Related Spare [Member] |  |  |  |
Assets Held For Sale [Line Items] |  |  |  |
Carrying value of mining fleet | 18.6 |  |  |
Carrying value of related spared | 7.8 |  |  |
APP [Member] |  |  |  |
Assets Held For Sale [Line Items] |  |  |  |
Carrying value | $ 40.0 | $ 1.0 |  |
Refiner royalty | 2.00% |  |  |
[1] | As Restated - Refer note 40 for further details.

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- Definition Impairment loss as per IFRS 5. + References No definition available. + Details
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- Definition The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_a&doctype=Standard -URIDate 2017-03-09 + Details
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