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Investments - Summary of Investments (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Listed |  |
At fair value through OCI (2017: available for sale financial assets) | $ 93.0 | $ 99.0
Unlisted |  |
Asanko redeemable preference shares | 132.9 | 0.0
Other | 0.1 | 0.1
Derivative instruments |  |
Warrants | 9.3 | 5.5
Total investments | 235.3 | $ 104.6
Fair value at acquisition | 129.9 |
Net change in fair value (recognised in OCI) | 3.0 |
Fair value at end of the year | 132.9 |
Par value of the preference shares | $ 165.0 |
Market-related interest rate | 7.85% |
Expected redemption period | 5 years |

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