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Deferred Taxation - Schedule of Detailed Components of Net Deferred Taxation Liability (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Liabilities    
Liabilities $ 1,048.7 $ 1,069.2
Assets    
Assets (808.4) (809.3)
– Unrealised loss on financial instruments 0.0 (7.4)
Net deferred taxation liabilities 240.3 259.9
Included in the statement of financial position as follows:    
Deferred taxation assets (260.6) (240.0)
Deferred taxation liabilities 500.9 499.9
Net deferred taxation liabilities 240.3 259.9
Balance at beginning of the year 259.9 168.1
Recognised in profit or loss (27.2) 66.0
Recognised in OCI (2.0) 1.2
Translation adjustment 9.6 24.6
Balance at end of the year 240.3 259.9
– Mining assets    
Liabilities    
Liabilities 899.9 893.2
– Right-of-use assets    
Liabilities    
Liabilities 124.6 134.0
– Investment in environmental trust funds    
Liabilities    
Liabilities 4.1 4.0
– Inventories    
Liabilities    
Liabilities 14.7 16.4
– Unremitted earnings    
Liabilities    
Liabilities 0.0 12.6
– Other    
Liabilities    
Liabilities 5.4 9.0
– Provisions    
Assets    
Assets (131.2) (131.9)
- Tax losses    
Assets    
Assets (49.7) (61.8)
- Unredeemed capital expenditure    
Assets    
Assets (499.2) (477.3)
– Lease liabilities    
Assets    
Assets $ (128.3) $ (130.9)