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Deferred Taxation - Schedule of Detailed Components of Net Deferred Taxation Liability (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2018
Liabilities      
Liabilities $ 1,053.1 $ 864.7  
Assets      
Assets (885.0) (679.3)  
Unrealised loss on financial instruments (38.3) (6.8)  
Net deferred taxation liabilities 168.1 185.4  
Included in the statement of financial position as follows:      
Deferred taxation assets (265.5) (269.5) [1] $ (72.0)
Deferred taxation liabilities 433.6 454.9 [1] $ 453.9
Net deferred taxation liabilities 168.1 185.4  
Balance at beginning of the year 185.4 381.9  
Recognised in profit or loss - continuing operations (15.0) (211.6)  
Recognised in OCI 8.4 (4.0)  
Translation adjustment (10.7) 19.1  
Balance at end of the year 168.1 185.4  
Mining Assets [member]      
Liabilities      
Liabilities 908.3 835.7  
Right-of-use assets [member]      
Liabilities      
Liabilities 101.5    
Environmental Trust Funds [member]      
Liabilities      
Liabilities 3.7 3.2  
Inventories [member]      
Liabilities      
Liabilities 13.3 11.3  
Unremitted earnings [member]      
Liabilities      
Liabilities 13.3 9.3  
Other [member]      
Liabilities      
Liabilities 13.0 5.2  
Provisions [member]      
Assets      
Assets (117.4) (95.8)  
Tax Losses [member]      
Assets      
Assets (120.6) (98.4)  
Unredeemed Capital Expenditure [member]      
Assets      
Assets (505.7) (475.9)  
Finance lease liability [member]      
Assets      
Assets (103.0) (2.0)  
Deferred Tax Assets Other [member]      
Assets      
Assets $ 0.0 $ (0.4)  
[1] Refer note 42.