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Loan Advanced - Expected Credit Losses (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Schedule Of Expected Credit Losses [Line Items]        
Loan advanced – contractor $ 23.4 $ 23.4 $ 27.3  
– Ghana expected credit loss   17.5 41.1 $ 29.0
Ghana expected credit loss - loan advanced to contractor        
Schedule Of Expected Credit Losses [Line Items]        
Loan advanced – contractor 23.4 23.4 27.3 68.4
– Ghana expected credit loss   3.9 $ 41.1 $ 0.0
Ghana expected credit loss - loan advanced to contractor | Gold fields and Engineers & Planners | Twarka and Damang        
Schedule Of Expected Credit Losses [Line Items]        
Loan advanced – contractor 23.4 $ 23.4    
– Ghana expected credit loss $ 45.0