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Deferred Taxation - Schedule of Detailed Components of Net Deferred Taxation Liability (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Liabilities    
Liabilities $ 864.7 $ 1,051.3
Assets    
Assets (679.3) (669.4)
Net deferred taxation liabilities 185.4 381.9
Included in the statement of financial position as follows:    
Deferred taxation assets (269.5) (72.0)
Deferred taxation liabilities 454.9 453.9
Net deferred taxation liabilities 185.4 381.9
Balance at beginning of the year 381.9 409.9
Recognised in profit or loss - continuing operations (211.6) (31.5)
Recognised in profit or loss - discontinued operations 0.0 3.4
Recognised in OCI (4.0) 0.0
Translation adjustment 19.1 0.1
Balance at end of the year 185.4 381.9
Mining Assets [member]    
Liabilities    
Liabilities 835.7 1,014.1
Environmental Trust Funds [member]    
Liabilities    
Liabilities 3.2 3.4
Inventories [member]    
Liabilities    
Liabilities 11.3 12.1
Unremitted earnings [member]    
Liabilities    
Liabilities 9.3 9.1
Other [member]    
Liabilities    
Liabilities 5.2 12.6
Provisions [member]    
Assets    
Assets (95.8) (108.4)
Tax Losses [member]    
Assets    
Assets (98.4) (69.1)
Unredeemed Capital Expenditure [member]    
Assets    
Assets (475.9) (491.9)
Finance lease liability [member]    
Assets    
Assets (2.0) 0.0
Deferred Tax Assets Other [member]    
Assets    
Assets $ (7.2) $ 0.0