XML 523 R150.htm IDEA: XBRL DOCUMENT v3.20.1
Investments - Summary of Investments (Detail) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Jan. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Listed      
At fair value through OCI (2017: available for sale financial assets)   $ 47.9 $ 93.0
Unlisted      
Asanko redeemable preference shares   95.5 132.9
Other   0.0 0.1
Derivative instruments      
Warrants   11.7 9.3
Total investments   155.1 235.3
Fair value at acquisition   132.9 129.9
Purchase of preference shares   20.0 0.0
Redemption of preference shares   (10.0) 0.0
Net change in fair value (recognised in OCI)   (47.4) 3.0
Fair value at end of the year   $ 95.5 $ 132.9
Market-related interest rate 7.85% 8.50% 7.85%
Expected redemption period 5 years 8 years 5 years