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Equity-Accounted Investees - Other investments (Detail) - USD ($)
 12 Months Ended
Jan. 09, 2024
Dec. 06, 2017
Aug. 22, 2016
Dec. 31, 2023
Dec. 31, 2022
Jul. 10, 2023
Oct. 19, 2018
Disclosure of joint operations [line items]              
Investment in associates       $ 10,000,000.0 $ 12,400,000    
Total equity accounted investees       10,000,000.0 12,400,000    
Assets held for sale       153,300,000 0    
Total equity accounted investees       548,600,000 84,900,000    
Lunnon Metals Limited              
Disclosure of joint operations [line items]              
Total equity accounted investees       10,000,000.0 12,400,000    
Share of profit (loss) of associates accounted for using equity method       $ 2,900,000 $ 1,900,000    
Proportion of ownership interest in associate       31.06% 33.96%    
Rusoro Mining Limited              
Disclosure of joint operations [line items]              
Total equity accounted investees       $ 0      
Assets held for sale       $ 0 $ 0    
Proportion of ownership interest in associate       24.40% 24.80%    
Total equity accounted investees       $ 0      
Fair value of investment based on quoted market price       64,500,000 $ 5,200,000    
Unrecognised share of profits       7,100,000 3,800,000    
Cumulative unrecognised share of losses       $ 221,800,000 $ 214,700,000    
Pre and post award     $ 967,800,000        
Excess of pre and post award     $ 1,700,000,000        
Arbitration settlement   $ 1,300,000,000          
Accrued interest percentage       9.00%      
Total settlement agreement amount             $ 1,280,000,000
Gain contingencies, other claims with higher priority           $ 3,500,000,000  
Rusoro Mining Limited | Other disposals of assets              
Disclosure of joint operations [line items]              
Number of common shares sold (in shares) 140,000,001            
Portion of consideration paid received consisting of cash and cash equivalents $ 62,300,000