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Interest in Joint Operation (Details)
$ in Millions, $ in Millions
Dec. 31, 2023
USD ($)
Dec. 31, 2023
AUD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2022
AUD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Disclosure of joint operations [line items]            
Non-current assets $ 6,338.6   $ 5,535.7      
Property, plant and equipment 5,074.4   4,815.7      
Environmental trust funds 109.6   98.8   $ 88.1  
Cash and cash equivalents 648.7   769.4   $ 524.7 $ 886.8
Inventories 827.9   759.0      
Total assets 8,226.3   7,338.1      
Retained earnings 2,963.9   2,629.2      
Non-current liabilities 2,100.7   2,213.2      
Deferred taxation 389.3   399.8      
Finance lease liabilities 359.7   330.1      
Long-term incentive plan 40.5   22.4      
Current liabilities 1,505.8   785.4      
Trade and other payables 643.9   600.7      
Current portion of finance lease liabilities 76.7   64.1      
Total equity and liabilities 8,226.3   7,338.1      
Joint operations            
Disclosure of joint operations [line items]            
Non-current assets 507.0 $ 744.4 517.5 $ 759.0    
Property, plant and equipment 507.0 744.4 515.0 755.4    
Environmental trust funds 0.0 0.0 2.5 3.6    
Current assets 70.3 103.2 62.6 91.9    
Cash and cash equivalents 19.8 29.1 10.8 15.9    
Inventories 47.2 69.3 50.4 74.0    
Other receivables 3.3 4.8 1.4 2.0    
Total assets 577.3 847.6 580.1 850.9    
Retained earnings 168.5 247.4 116.9 171.5    
Non-current liabilities 162.9 239.2 153.3 224.9    
Deferred taxation 60.4 88.7 58.2 85.4    
Finance lease liabilities 77.6 114.0 75.2 110.3    
Environmental rehabilitation costs 22.2 32.6 18.1 26.6    
Long-term incentive plan 2.7 3.9 1.8 2.6    
Current liabilities 245.9 361.0 309.8 454.5    
Related entity loans payable 209.6 307.6 278.7 408.9    
Trade and other payables 27.2 40.0 23.0 33.7    
Current portion of finance lease liabilities 9.1 13.4 8.1 11.9    
Total equity and liabilities $ 577.3 $ 847.6 $ 580.1 $ 850.9