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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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 | $ 0.0 | $ 0.0 | $ 51.8

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