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Interest in Joint Operation (Details)
$ in Millions, $ in Millions
Dec. 31, 2022
USD ($)
Dec. 31, 2022
AUD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
AUD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Disclosure of joint operations [line items]            
Non-current assets $ 5,535.7   $ 5,927.7      
Property, plant and equipment 4,815.7   5,079.1      
Environmental trust funds 98.8   88.1   $ 79.3  
Cash and cash equivalents 769.4   524.7   $ 886.8 $ 515.0
Inventories 759.0   627.6      
Total assets 7,338.1   7,348.8      
Retained earnings 2,629.2   2,222.6      
Non-current liabilities 2,213.2   2,396.3      
Deferred taxation 399.8   500.9      
Finance lease liabilities 330.1   355.1      
Long-term incentive plan 22.4   28.2      
Current liabilities 785.4   822.4      
Trade and other payables 600.7   577.7      
Current portion of finance lease liabilities 64.1   60.4      
Total equity and liabilities 7,338.1   7,348.8      
Joint operations            
Disclosure of joint operations [line items]            
Non-current assets 517.4 $ 759.0 587.8 $ 808.0    
Property, plant and equipment 515.0 755.4 587.8 808.0    
Environmental trust funds 2.5 3.6 0.0 0.0    
Current assets 62.6 91.9 45.4 62.4    
Cash and cash equivalents 10.8 15.9 7.6 10.4    
Inventories 50.4 74.0 36.1 49.6    
Other receivables 1.4 2.0 1.7 2.4    
Total assets 580.1 850.9 633.2 870.4    
Retained earnings 116.9 171.5 64.6 88.9    
Non-current liabilities 153.3 224.9 161.5 221.9    
Deferred taxation 58.2 85.4 63.4 87.2    
Finance lease liabilities 75.2 110.3 76.2 104.7    
Environmental rehabilitation costs 18.1 26.6 20.2 27.7    
Long-term incentive plan 1.8 2.6 1.7 2.3    
Current liabilities 309.8 454.5 407.1 559.6    
Related entity loans payable 278.7 408.9 377.2 518.5    
Trade and other payables 23.0 33.7 22.3 30.7    
Current portion of finance lease liabilities 8.1 11.9 7.6 10.4    
Total equity and liabilities $ 580.1 $ 850.9 $ 633.2 $ 870.4