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Interest in Joint Operation - Summary of Share of Joint Operation and Includes Inter-company Transactions and Balances (Detail)
$ in Millions, $ in Millions
Dec. 31, 2018
USD ($)
Dec. 31, 2018
AUD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
AUD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Non-current assets            
Property, plant and equipment $ 4,259.2   $ 4,892.9      
Current assets 921.1   1,114.4      
Cash and cash equivalents 399.7   479.0   $ 526.7 $ 440.0
Inventories 368.2   393.5      
Prepayments 43.3   51.5      
Total assets 6,104.3   6,620.1      
Total equity            
Retained earnings 1,073.9   1,471.1      
Non-current liabilities 2,781.9   2,363.1      
Deferred taxation 454.9   453.9      
Finance lease liability 80.1   0.0      
Long-term incentive plan 2.1   0.0      
Current liabilities 615.5   854.0      
Trade and other payables 503.0   548.5      
Current portion of finance lease liability 8.5   0.0      
Total equity and liabilities 6,104.3   6,620.1      
Joint operations [member]            
Non-current assets            
Property, plant and equipment 554.6 $ 788.6 374.9 $ 485.7    
Current assets 11.7 16.5 7.2 9.3    
Cash and cash equivalents 2.1 3.0 5.3 6.8    
Inventories 0.8 1.1 0.0 0.0    
Prepayments 6.4 9.1 1.9 2.5    
Other receivables 2.4 3.3 0.0 0.0    
Total assets 566.3 805.1 382.1 495.0    
Total equity            
Retained earnings (4.7) (6.7) (2.3) (2.9)    
Non-current liabilities 119.7 170.3 11.8 15.2    
Deferred taxation 30.5 43.3 4.2 5.4    
Finance lease liability 76.5 108.8 0.0 0.0    
Environmental rehabilitation costs 12.7 18.2 0.0 0.0    
Long-term incentive plan 0.0 0.0 7.6 9.8    
Current liabilities 451.3 641.5 372.6 482.7    
Related entity loans payable 439.0 624.1 347.3 449.9    
Trade and other payables 7.7 10.9 14.1 18.3    
Deferred consideration 0.0 0.0 11.2 14.5    
Current portion of finance lease liability 4.6 6.5 0.0 0.0    
Total equity and liabilities $ 566.3 $ 805.1 $ 382.1 $ 495.0