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Ghana Expected Credit Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of impairment loss and reversal of impairment loss [line items]      
– Ghana expected credit loss $ 17.5 $ 41.1 $ 29.0
Loan advanced – contractor 23.4 27.3  
Ghana expected credit loss - loan advanced to contractor      
Disclosure of impairment loss and reversal of impairment loss [line items]      
– Ghana expected credit loss 3.9 41.1 0.0
Loan advanced – contractor 23.4 27.3 68.4
Trade and other receivables      
Disclosure of impairment loss and reversal of impairment loss [line items]      
– Ghana expected credit loss $ 13.6 $ 0.0 $ 29.0