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Impairment, Net of Reversal of Impairment of Investments and Assets - Sensitivity Analysis on Cash Generating Units with Impairments (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2022
USD ($)
Disclosures of impairment of investments and assets [line items]  
(Decrease)/increase in discount rates (1.00%)
(Decrease)/increase in discount rates 1.00%
Tarkwa  
Disclosures of impairment of investments and assets [line items]  
Increase (decrease) in recoverable amount as a result of one hundred dollars per ounce decrease in gold price $ (101.5)
Increase (decrease) in recoverable amount as a result of one hundred dollars per ounce increase in gold price 101.5
Increase (decrease) in recoverable amount as a result of one percent decrease in discount rate 31.7
Increase (decrease) in recoverable amount as a result of one percent increase in discount rate (29.7)
Cerro Corona  
Disclosures of impairment of investments and assets [line items]  
Increase (decrease) in recoverable amount as a result of one hundred dollars per ounce decrease in gold price (17.1)
Increase (decrease) in recoverable amount as a result of one hundred dollars per ounce increase in gold price 17.1
Increase (decrease) in recoverable amount as a result of one percent decrease in discount rate 19.4
Increase (decrease) in recoverable amount as a result of one percent increase in discount rate $ (18.5)