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Deferred Taxation - Schedule of Detailed Components of Net Deferred Taxation Liability (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
 [1]
Dec. 31, 2015
Liabilities      
Liabilities $ 1,051.3 $ 986.3  
Assets      
Assets (669.4) (576.4)  
Net deferred taxation liabilities 381.9 409.9  
Included in the statement of financial position as follows:      
Deferred taxation assets (72.0) (48.7) $ (54.1)
Deferred taxation liabilities 453.9 458.6 $ 482.2 [1]
Balance at end of the year 381.9 409.9  
Balance at beginning of the year 409.9 428.1  
Recognised in profit or loss - continuing operations (31.5) (14.7)  
Recognised in profit or loss - discontinued operations 3.4 0.1  
Translation adjustment 0.1 (3.6)  
Balance at end of the year 381.9 409.9  
Mining Assets [member]      
Liabilities      
Liabilities 1,014.1 966.3  
Environmental Trust Funds [member]      
Liabilities      
Liabilities 3.4 2.8  
Inventories [member]      
Liabilities      
Liabilities 12.1 13.7  
Unremitted earnings [member]      
Liabilities      
Liabilities 9.1 0.0  
Other [member]      
Liabilities      
Liabilities 12.6 3.5  
Provisions [member]      
Assets      
Assets (108.4) (100.8)  
Tax Losses [member]      
Assets      
Assets (69.1) (54.7)  
Unredeemed Capital Expenditure [member]      
Assets      
Assets $ (491.9) $ (420.9)  
[1] As Restated - Refer note 40 for further details.