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Equity-Accounted Investees - Summary of Equity-Accounted Investees (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of equity-accounted investees [line items]      
Investment in joint ventures $ 538.6 $ 72.5  
Total equity accounted investees 10.0 12.4  
Total equity accounted investees 548.6 84.9  
Share of results of equity investees, net of taxation (32.6) (2.9) $ (2.6)
Discontinued operations      
Disclosure of equity-accounted investees [line items]      
Share of results of equity investees, net of taxation 18.9 (13.0) 29.4
Aggregate continuing and discontinued operations      
Disclosure of equity-accounted investees [line items]      
Share of results of equity investees, net of taxation (51.5) 10.1 (32.0)
Far Southeast Gold Resources Incorporated (“FSE”)      
Disclosure of equity-accounted investees [line items]      
Investment in joint ventures 0.0 0.0  
Share of results of equity investees, net of taxation (1.3) (1.0) (1.6)
Asanko Gold      
Disclosure of equity-accounted investees [line items]      
Investment in joint ventures 53.6 72.5  
Asanko Gold | Non-current assets held for sale      
Disclosure of equity-accounted investees [line items]      
Investment in joint ventures 0.0    
Asanko Gold | Earnings      
Disclosure of equity-accounted investees [line items]      
Share of results of equity investees, net of taxation 28.0 13.0 23.4
Asanko Gold | Impairment      
Disclosure of equity-accounted investees [line items]      
Share of results of equity investees, net of taxation (46.9) 0.0 (52.8)
Windfall Project      
Disclosure of equity-accounted investees [line items]      
Investment in joint ventures 538.6 0.0  
Windfall Project | Impairment      
Disclosure of equity-accounted investees [line items]      
Share of results of equity investees, net of taxation (28.4) 0.0 0.0
Other associates      
Disclosure of equity-accounted investees [line items]      
Total equity accounted investees 10.0 12.4  
Share of results of equity investees, net of taxation $ (2.9) $ (1.9) $ (1.0)