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Accounting Policies - Narrative (Detail)
$ in Millions
 12 Months Ended
Dec. 21, 2023
May 02, 2023
Dec. 31, 2023
USD ($)
ExchangeRates
Dec. 31, 2022
USD ($)
ExchangeRates
Dec. 31, 2021
USD ($)
ExchangeRates
Disclosure of changes in accounting estimates [line items]          
Property, plant and equipment     $ 5,074.4 $ 4,815.7  
Impairment loss recognised in profit or loss, property, plant and equipment     156.4 391.4 $ 11.6
Gold-in-process and stockpiles     814.6 725.7  
Inventory write-down     33.8 0.0 0.0
Share of results of equity investees, net of taxation     (32.6) (2.9) (2.6)
Total equity accounted investees     548.6 84.9  
Provision for decommissioning, restoration and rehabilitation costs     452.9 387.7 430.9
Current provision for decommissioning, restoration and rehabilitation costs     46.8 17.2  
Non-current provision for decommissioning, restoration and rehabilitation costs     406.1 370.5  
Provisions     5.1 10.5 13.1
Current portion of silicosis settlement costs     0.2 1.3  
Non-current portion of silicosis settlement costs     4.9 9.2  
Deferred taxation liabilities     389.3 399.8  
Deferred taxation asset     172.2 195.5  
Tax payable     95.7 53.6  
Tax receivable     82.1 76.0  
Share-based payments     9.1 6.9 12.7
Charge to income statement     55.8 29.0 28.5
Long term incentive plan liability     78.9 53.0 56.6
Current portion of long-term incentive plan     38.4 30.6  
Non-current portion of long-term incentive plan     40.5 22.4  
Financial instruments designated as hedging instruments, at fair value     0.0 0.0  
Gain on financial instruments     0.0 (24.0) 100.4
Redeemable preference shares write-off     33.0 37.3  
– Asanko redeemable preference shares     $ 99.7 60.3  
Dividends withholding tax percentage     20.00%    
Canadian Subsidiary          
Disclosure of changes in accounting estimates [line items]          
Group beneficial interest   100.00%      
Discontinued operations          
Disclosure of changes in accounting estimates [line items]          
Share of results of equity investees, net of taxation     $ 18.9 (13.0) 29.4
Asanko Gold          
Disclosure of changes in accounting estimates [line items]          
Interest in joint venture 45.00%   45.00%    
Asanko Gold | Impairment | Discontinued operations          
Disclosure of changes in accounting estimates [line items]          
Share of results of equity investees, net of taxation     $ (46.9) $ 0.0 $ (52.8)
Windfall Project          
Disclosure of changes in accounting estimates [line items]          
Interest in joint venture   50.00%      
Rand          
Disclosure of changes in accounting estimates [line items]          
Closing exchange rate | ExchangeRates     18.30 17.02 15.94
Average exchange rate | ExchangeRates     18.45 16.37 14.79
US Dollar          
Disclosure of changes in accounting estimates [line items]          
Closing exchange rate | ExchangeRates     0.68 0.69 0.73
Average exchange rate | ExchangeRates     0.66 0.68 0.75
Canadian Dollar          
Disclosure of changes in accounting estimates [line items]          
Closing exchange rate | ExchangeRates     0.75    
Average exchange rate | ExchangeRates     0.74    
Far Southeast Gold Resources Incorporated ("FSE")          
Disclosure of changes in accounting estimates [line items]          
Total equity accounted investees       $ 0.0  
Tarkwa cash-generating unit          
Disclosure of changes in accounting estimates [line items]          
Impairment loss recognised in profit or loss, property, plant and equipment     $ 0.0 325.2 $ 0.0
Peru cash-generating unit          
Disclosure of changes in accounting estimates [line items]          
Impairment loss recognised in profit or loss, property, plant and equipment     $ 156.2 $ 63.1 $ 0.0