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Investments - Summary of Investments (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2020
Listed |  |
At fair value through OCI | $ 47.9 | $ 42.4
Unlisted |  |
Asanko redeemable preference shares | 95.5 | 92.6
Derivative instruments |  |
Warrants | 11.7 | 12.9
Total investments | 155.1 | 147.9
Fair value at beginning of the year | 132.9 | 95.5
Purchase of preference shares | 20.0 |
Redemption of preference shares | (10.0) | (37.5)
Net change in fair value (recognised in OCI) | (47.4) | 34.6
Fair value at end of the year | $ 95.5 | $ 92.6

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