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Ghana Expected Credit Loss - Summary of loans to contractors (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of impairment loss and reversal of impairment loss [line items]        
Loan advanced – contractor $ 0.0 $ 23.4    
Ghana expected credit loss (33.2) (17.5) $ (41.1)  
Loan advanced – contractor | Lifetime expected credit losses        
Disclosure of impairment loss and reversal of impairment loss [line items]        
Allowance account for credit losses of financial assets   45.0    
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)  
Ghana expected credit loss - loan advanced to contractor | Gold fields and Engineers & Planners | Twarka and Damang        
Disclosure of impairment loss and reversal of impairment loss [line items]        
Loan advanced – contractor 0.0 23.4   $ 68.4
Allowance account for credit losses of financial assets 68.4      
Interest included in trade and other payables        
Disclosure of impairment loss and reversal of impairment loss [line items]        
Ghana expected credit loss (2.0)      
Loans to contractors, excl. interest        
Disclosure of impairment loss and reversal of impairment loss [line items]        
Loan advanced – contractor 0.0 23.4 $ 27.3  
Ghana expected credit loss $ (23.4) $ (3.9)