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Ghana Expected Credit Loss - Summary of expected credit losses (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of impairment loss and reversal of impairment loss [line items]      
Ghana expected credit loss $ (33.2) $ (17.5) $ (41.1)
Trade and other receivables 251.4 198.0  
Ghana expected credit loss - loan advanced to contractor      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Ghana expected credit loss (25.4) (3.9) (41.1)
Trade and other receivables | Damang      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Ghana expected credit loss (7.8) 0.0 0.0
Trade and other receivables 7.8    
Trade and other receivables | Tarkwa      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Ghana expected credit loss $ 0.0 (13.6) $ 0.0
Trade and other receivables   $ 13.6