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Acquisition Of Asanko Gold - Summary of Gain on Acquisition (Detail) - USD ($) $ in Millions	12 Months Ended
	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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Redeemable preference shares equity financial asset acquired.

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The fair value, at acquisition date, of the consideration transferred in a business combination. [Refer: Business combinations [member]]

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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]]

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