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Interest in Joint Operation (Details)
$ in Millions, $ in Millions
Dec. 31, 2021
USD ($)
Dec. 31, 2021
AUD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
AUD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Disclosure of joint operations [line items]            
Property, plant and equipment $ 5,079.1   $ 4,771.2      
Cash and cash equivalents 524.7   886.8   $ 515.0 $ 219.7
Inventories 627.6   521.6      
Total assets 7,348.8   7,472.8      
Retained earnings 2,222.6   1,755.6      
Non-current liabilities 2,396.3   2,728.1      
Deferred taxation 500.9   499.9      
Finance lease liabilities 355.1   364.8      
Long-term incentive plan 28.2   33.4      
Current liabilities 822.4   916.5      
Trade and other payables 577.7   550.6      
Current portion of finance lease liabilities 60.4   64.2      
Total equity and liabilities 7,348.8   7,472.8      
Joint operations            
Disclosure of joint operations [line items]            
Property, plant and equipment 587.8 $ 808.0 648.6 $ 843.0    
Current assets 45.4 62.4 34.2 44.4    
Cash and cash equivalents 7.6 10.4 7.3 9.5    
Inventories 36.1 49.6 23.1 30.0    
Other receivables 1.7 2.4 3.8 4.9    
Total assets 633.2 870.4 682.8 887.4    
Retained earnings 64.6 88.9 38.5 50.1    
Non-current liabilities 161.5 221.9 162.8 211.6    
Deferred taxation 63.4 87.2 60.7 78.9    
Finance lease liabilities 76.2 104.7 81.7 106.2    
Environmental rehabilitation costs 20.2 27.7 18.6 24.2    
Long-term incentive plan 1.7 2.3 1.8 2.3    
Current liabilities 407.1 559.6 481.5 625.7    
Related entity loans payable 377.2 518.5 452.8 588.4    
Trade and other payables 22.3 30.7 21.4 27.8    
Current portion of finance lease liabilities 7.6 10.4 7.3 9.5    
Total equity and liabilities $ 633.2 $ 870.4 $ 682.8 $ 887.4