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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, 2020
USD ($)
Dec. 31, 2020
AUD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
AUD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Non-current assets            
Property, plant and equipment $ 4,771.2   $ 4,657.1      
Current assets 1,730.4   1,069.9      
Cash and cash equivalents 886.8   515.0   $ 219.7 $ 393.8
Inventories 521.6   417.8      
Total assets 7,472.8   6,561.3      
Total equity            
Retained earnings 1,755.6   1,190.0      
Non-current liabilities 2,728.1   2,284.8      
Deferred taxation 499.9   433.6      
Finance lease liabilities 364.8   287.7      
Long-term incentive plan 33.4   11.5      
Current liabilities 916.5   1,367.8      
Trade and other payables 550.6   466.8      
Current portion of lease liability 64.2   45.2      
Total equity and liabilities 7,472.8   6,561.3      
Joint operations [member]            
Non-current assets            
Property, plant and equipment 648.6 $ 843.0 623.0 $ 887.6    
Current assets 34.2 44.4 27.5 39.3    
Cash and cash equivalents 7.3 9.5 6.5 9.3    
Inventories 23.1 30.0 18.3 26.1    
Other receivables 3.8 4.9 2.7 3.9    
Total assets 682.8 887.4 650.5 926.9    
Total equity            
Retained earnings 38.5 50.1 (0.6) (0.8)    
Non-current liabilities 162.8 211.6 147.3 209.9    
Deferred taxation 60.7 78.9 50.2 71.6    
Finance lease liabilities 81.7 106.2 79.4 113.1    
Environmental rehabilitation costs 18.6 24.2 17.6 25.1    
Long-term incentive plan 1.8 2.3 0.1 0.1    
Current liabilities 481.5 625.7 503.8 717.8    
Related entity loans payable 452.8 588.4 480.4 684.5    
Trade and other payables 21.4 27.8 17.5 24.9    
Current portion of lease liability 7.3 9.5 5.9 8.4    
Total equity and liabilities $ 682.8 $ 887.4 $ 650.5 $ 926.9