XML 419 R157.htm IDEA: XBRL DOCUMENT v3.21.1
Deferred Taxation - Schedule of Detailed Components of Net Deferred Taxation Liability (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Liabilities    
Liabilities $ 1,069.2 $ 1,053.1
Assets    
Assets (809.3) (885.0)
Unrealised loss on financial instruments (7.4) (38.3)
Net deferred taxation liabilities 259.9 168.1
Included in the statement of financial position as follows:    
Deferred taxation assets (240.0) (265.5)
Deferred taxation liabilities 499.9 433.6
Net deferred taxation liabilities 259.9 168.1
Balance at beginning of the year 168.1 185.4
Recognised in profit or loss - continuing operations 66.0 (15.0)
Recognised in OCI 1.2 8.4
Translation adjustment 24.6 (10.7)
Balance at end of the year 259.9 168.1
Mining Assets [member]    
Liabilities    
Liabilities 893.2 908.3
Right-of-use assets [member]    
Liabilities    
Liabilities 134.0 101.5
Environmental Trust Funds [member]    
Liabilities    
Liabilities 4.0 3.7
Inventories [member]    
Liabilities    
Liabilities 16.4 13.3
Unremitted earnings [member]    
Liabilities    
Liabilities 12.6 13.3
Other [member]    
Liabilities    
Liabilities 9.0 13.0
Provisions [member]    
Assets    
Assets (131.9) (117.4)
Tax Losses [member]    
Assets    
Assets (61.8) (120.6)
Unredeemed Capital Expenditure [member]    
Assets    
Assets (477.3) (505.7)
Lease liability [member]    
Assets    
Assets $ (130.9) $ (103.0)