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Equity-Accounted Investees - Summary of Equity-Accounted Investees (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of equity-accounted investees [line items]      
Investment in joint ventures $ 173.1 $ 233.3  
Investment in associates 5.7 0.0  
Total equity accounted investees 178.8 233.3  
Total share of results of equity investees, net of taxation (32.0) (2.6) $ 3.1
Far Southeast Gold Resources Incorporated ("FSE")      
Disclosure of equity-accounted investees [line items]      
Investment in joint ventures 113.6 144.4  
Total share of results of equity investees, net of taxation (1.6) (1.6) (1.4)
Asanko Gold      
Disclosure of equity-accounted investees [line items]      
Investment in joint ventures 59.5 88.9  
Asanko Gold | earnings      
Disclosure of equity-accounted investees [line items]      
Total share of results of equity investees, net of taxation 23.4 48.5 4.1
Asanko Gold | impairment      
Disclosure of equity-accounted investees [line items]      
Total share of results of equity investees, net of taxation (52.8) (49.5) 0.0
Maverix Metals Incorporated ("Maverix")      
Disclosure of equity-accounted investees [line items]      
Investment in associates 0.0 0.0  
Total share of results of equity investees, net of taxation 0.0 0.0 0.4
Other associates      
Disclosure of equity-accounted investees [line items]      
Investment in associates 5.7 0.0  
Total share of results of equity investees, net of taxation $ (1.0) $ 0.0 $ 0.0