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Assets Held for Sale - Additional Information (Detail) - USD ($) $ in Millions | Jan. 24, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Assets Held For Sale [line items] |  |  |  |
Carrying value |  | $ 4,259.2 | $ 4,892.9 |
APP [Member] |  |  |  |
Assets Held For Sale [line items] |  |  |  |
Carrying value |  |  |  | $ 1.0
Purchase offer, refiner royalty offered percentage | 2.00% |  |  |
Purchase offer, cash | $ 40.0 |  |  |
Purchase offer, refiner royalty offered percentage | 2.00% |  |  |
APP [Member] | Capped metals [member] |  |  |  |
Assets Held For Sale [line items] |  |  |  |
Purchase offer, refiner royalty offered percentage | 1.00% |  |  |
Purchase offer, cash | $ 20.0 |  |  |
Purchase offer, refiner royalty offered percentage | 1.00% |  |  |
APP [Member] | Uncapped metals [member] |  |  |  |
Assets Held For Sale [line items] |  |  |  |
Purchase offer, refiner royalty offered percentage | 1.00% |  |  |
Purchase offer, refiner royalty offered percentage | 1.00% |  |  |

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- Definition The portion of consideration paid or received, consisting of a percentage of net smeller refiner royalty, in respect of both obtaining and losing control of subsidiaries or other businesses. + 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 2018-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_73_e&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_54_a&doctype=Standard -URIDate 2018-03-16 + Details
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