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Acquisition Of Asanko Gold - Summary of Gain on Acquisition (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of detailed information about business combination [abstract] |  |  |
Total fair value of assets acquired | $ 216.8 |  |
Redeemable preference shares equity financial asset acquired | 129.9 |  |
Fair value of identifiable net assets acquired | 86.9 |  |
Consideration transferred | (165.0) |  |
Gain on acquisition | $ 51.8 | $ 0.0 | $ 0.0

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- Definition The amount of any gain recognised in a business combination in which the net of the identifiable assets acquired and the liabilities assumed exceeds the aggregate of the consideration transferred, non-controlling interest in the acquiree and fair value of the acquirer's previously held equity interest in the acquiree. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2018-01-01 -Paragraph B64 -Subparagraph n -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B64_n_i&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
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