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Deferred Taxation - Schedule of Detailed Components of Net Deferred Taxation Liability (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Liabilities    
Liabilities $ 917.3 $ 1,048.7
Assets    
Assets (713.0) (808.4)
Net deferred taxation liabilities 204.3 240.3
Included in the statement of financial position as follows:    
Deferred taxation assets (195.5) (260.6)
Deferred taxation liabilities 399.8 500.9
Net deferred taxation liabilities 204.3 240.3
Balance at beginning of the year 240.3 259.9
Recognised in profit or loss (33.0) (27.2)
Recognised in OCI (0.1) (2.0)
Translation adjustment (2.9) 9.6
Balance at end of the year 204.3 240.3
– Mining assets    
Liabilities    
Liabilities 776.4 899.9
– Right-of-use assets    
Liabilities    
Liabilities 104.2 124.6
– Investment in environmental trust funds    
Liabilities    
Liabilities 4.7 4.1
– Inventories    
Liabilities    
Liabilities 18.9 14.7
– Other    
Liabilities    
Liabilities 13.1 5.4
– Provisions    
Assets    
Assets (107.9) (131.2)
- Tax losses    
Assets    
Assets (56.1) (49.7)
- Unredeemed capital expenditure    
Assets    
Assets (428.4) (499.2)
– Lease liabilities    
Assets    
Assets $ (120.6) $ (128.3)