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Investments - Summary of Investments (Detail) - USD ($)
$ / shares in Units, $ in Millions
Dec. 31, 2021
Dec. 31, 2020
Listed    
At fair value through OCI $ 30.9 $ 42.4
Unlisted    
Asanko redeemable preference shares 94.5 92.6
Derivative instruments    
Warrants 0.0 12.9
Other 13.2 0.0
Total investments $ 138.6 $ 147.9
Redeemable preference shares 132,439,999 137,439,999
Redeemable preference shares, par value $ 132,439,999 $ 137,439,999
Asanko Gold    
Listed    
At fair value through OCI $ 15.8 $ 24.7
Magmatic Resources Limited    
Listed    
At fair value through OCI 1.4 2.5
Chakana Copper Corp    
Listed    
At fair value through OCI 5.3 7.4
Lefroy Exploration Limited    
Listed    
At fair value through OCI $ 4.9 $ 3.8