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Deferred Taxation - Schedule of Detailed Components of Net Deferred Taxation Liability (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Liabilities    
Liabilities $ 872.7 $ 917.3
Assets    
Assets (655.6) (713.0)
Net deferred taxation liabilities 217.1 204.3
Included in the statement of financial position as follows:    
Deferred taxation assets (172.2) (195.5)
Deferred taxation liabilities 389.3 399.8
Net deferred taxation liabilities 217.1 204.3
Balance at beginning of the year 204.3 240.3
Recognised in profit or loss 6.8 (33.0)
Recognised in OCI 0.3 (0.1)
Translation adjustment 5.7 (2.9)
Balance at end of the year 217.1 204.3
– Mining assets    
Liabilities    
Liabilities 719.9 776.4
– Right-of-use assets    
Liabilities    
Liabilities 110.9 104.2
– Investment in environmental trust funds    
Liabilities    
Liabilities 4.9 4.7
– Inventories    
Liabilities    
Liabilities 21.6 18.9
– Other    
Liabilities    
Liabilities 15.4 13.1
– Provisions    
Assets    
Assets (110.7) (107.9)
- Tax losses    
Assets    
Assets (54.2) (56.1)
- Unredeemed capital expenditure    
Assets    
Assets (364.0) (428.4)
– Lease liabilities    
Assets    
Assets $ (126.7) $ (120.6)