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Taxation Paid - Detailed Information About Income Tax (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2023
CAD ($)
Dec. 31, 2022
CAD ($)
Income tax paid [line items]          
Tax receivable (payable), net at the beginning of the year $ (22.4) $ 115.9 $ (121.3)    
SA and foreign current taxation recognised in profit or loss (458.3) (475.1) (424.4)    
Tax receivable (payable), net at the end of the year 13.6 (22.4) 115.9    
Translation 0.5 1.7 (19.0)    
Total taxation paid (421.8) (611.7) (448.8)    
Non-current taxation receivable 75.7 0.0 0.0 $ 100.3  
Taxation receivable (6.4) (76.0) 0.0    
Taxation payable 95.7 53.6 115.9    
Tax Receivable (Payable), Net (13.6) 22.4 $ (115.9)    
Tax receivable $ 82.1 $ 76.0      
Canada          
Income tax paid [line items]          
Tax receivable         $ 100.3