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Equity-Accounted Investees - Summary of Equity-Accounted Investees (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of equity-accounted investees [line items]      
Investment in joint ventures $ 72.5 $ 173.1  
Total equity accounted investees 12.4 5.7  
Total equity accounted investees 84.9 178.8  
Total share of results of equity investees, net of taxation 10.1 (32.0) $ (2.6)
Far Southeast Gold Resources Incorporated ("FSE")      
Disclosure of equity-accounted investees [line items]      
Investment in joint ventures 0.0 113.6  
Total equity accounted investees 0.0    
Total share of results of equity investees, net of taxation (1.0) (1.6) (1.6)
Asanko Gold      
Disclosure of equity-accounted investees [line items]      
Investment in joint ventures 72.5 59.5  
Asanko Gold | earnings      
Disclosure of equity-accounted investees [line items]      
Total share of results of equity investees, net of taxation 13.0 23.4 48.5
Asanko Gold | impairment      
Disclosure of equity-accounted investees [line items]      
Total share of results of equity investees, net of taxation 0.0 (52.8) (49.5)
Other associates      
Disclosure of equity-accounted investees [line items]      
Total equity accounted investees 12.4 5.7  
Total share of results of equity investees, net of taxation $ (1.9) $ (1.0) $ 0.0