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Equity-Accounted Investees - Other investments (Detail) - USD ($)
 12 Months Ended
Dec. 06, 2017
Aug. 22, 2016
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Oct. 19, 2018
Dec. 31, 2010
Disclosure of joint operations [line items]              
Investment in associates     $ 5,700,000 $ 0      
Total equity accounted investees     178,800,000 233,300,000      
Carrying value write down due to loss incurred by the entity     178,800,000 233,300,000      
Lunnon Metals Limited              
Disclosure of joint operations [line items]              
Total equity accounted investees     $ 5,700,000 0      
Proportion of ownership interest in associate     31.65%        
Share of profit (loss) of associates accounted for using equity method     $ 1,000,000        
Rusoro Mining Limited              
Disclosure of joint operations [line items]              
Total equity accounted investees     $ 0 $ 0      
Proportion of ownership interest in associate     25.70% 25.70%      
Carrying value write down due to loss incurred by the entity             $ 0
Fair value of investment based on quoted market price     $ 5,500,000 $ 4,400,000      
Unrecognised share of profits     3,100,000 5,000,000      
Cumulative unrecognised share of losses     $ 210,900,000 $ 207,800,000      
Pre and post award   $ 967,800,000          
Excess of pre and post award   $ 1,200,000,000          
Arbitration settlement $ 1,300,000,000            
Accrued interest percentage         9.00%    
Total settlement agreement amount           $ 1,280,000,000