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Taxation Paid - Detailed Information About Income Tax (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2022
CAD ($)
Income taxes paid (refund) [abstract]        
Amount owing at beginning of the year $ (115.9) $ (121.3) $ (24.8)  
SA and foreign current taxation recognised in profit or loss (475.1) (424.4) (366.5)  
SA and foreign current taxation recognised in OCI 0.0 0.0 0.0  
Amount (receivable)/payable at end of the year (22.4) 115.9 121.3  
Translation 1.7 (19.0) (8.7)  
Total taxation paid (611.7) (448.8) $ (278.7)  
Tax receivable 76.0 0.0   $ 100.3
Tax payable $ 53.6 $ (115.9)