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Discontinued Operation - Summary of discontinued operation (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 12 Months Ended 36 Months Ended
Dec. 31, 2026
Dec. 31, 2025
Dec. 21, 2023
Mar. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2026
Disclosure of detailed information about business combination [line items]                
Share of results of equity investees, net of taxation         $ (32.6) $ (2.9) $ (2.6)  
(Loss)/profit from discontinued operation         $ (18.9) 13.0 (29.4)  
Asanko Gold | Contingent consideration                
Disclosure of detailed information about business combination [line items]                
Discount rate applied to cash flow projections         15.10%      
Asanko Gold | Deferred consideration                
Disclosure of detailed information about business combination [line items]                
Discount rate applied to cash flow projections         7.90%      
Asanko Gold | Forecast                
Disclosure of detailed information about business combination [line items]                
Consideration paid (received) $ 30.0 $ 25.0 $ 30.0 $ 85.0       $ 170.0
Asanko Gold | Galiano Gold Inc. (formerly Asanko Gold Inc.)                
Disclosure of detailed information about business combination [line items]                
Number of shares in equity accounted investees         28.5      
Share price (in USD per share)         $ 0.92      
Discontinued operations                
Disclosure of detailed information about business combination [line items]                
Share of results of equity investees, net of taxation         $ 18.9 (13.0) 29.4  
Earnings | Discontinued operations | Asanko Gold                
Disclosure of detailed information about business combination [line items]                
Share of results of equity investees, net of taxation         28.0 13.0 23.4  
Impairment | Discontinued operations | Asanko Gold                
Disclosure of detailed information about business combination [line items]                
Share of results of equity investees, net of taxation         $ (46.9) $ 0.0 $ (52.8)