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Accounting policies - Reporting entity (Details)
7 Months Ended 12 Months Ended
Nov. 17, 2023
May 10, 2023
Dec. 31, 2023
continent
Dec. 31, 2023
shaft
continent
reef
facility
region
shaftComplex
plant
concentrator
miningTailingDam
Dec. 31, 2022
Nov. 01, 2023
Accounting policies            
Number of continents | continent     5 5    
Number of regions | region       4    
Number of established shaft complexes | shaftComplex       2    
Number of concentrators on site | concentrator       8    
Copper Mines Of Tasmania Proprietary Limited            
Accounting policies            
Proportion of ownership interest in entity 100.00%     100.00%    
Kroondal Mine            
Accounting policies            
Percentage of voting equity interests acquired     100.00% 100.00%    
Rhyolite Ridge            
Accounting policies            
Expected proportion of ownership interest in joint venture       50.00%    
Ioneer Limited            
Accounting policies            
Proportion of ownership interest in entity       6.91%    
Keliber            
Accounting policies            
Proportion of ownership interest in subsidiary     79.82% 79.82% 84.96%  
Century            
Accounting policies            
Percentage of voting equity interests acquired   49.85% 49.85% 49.85%    
Proportion of ownership interest in subsidiary   100.00%   100.00%    
Beatrix            
Accounting policies            
Number of operating vertical shafts       2    
Number of metallurgical plants | plant       1    
Driefontein            
Accounting policies            
Number of operating vertical shafts       4    
Number of metallurgical plants | plant       1    
Number of reefs | reef       3    
Kloof            
Accounting policies            
Number of operating vertical shafts       3    
Number of metallurgical plants | plant       1    
Number of reefs | reef       4    
Cooke            
Accounting policies            
Number of operating vertical shafts       4    
Marikana            
Accounting policies            
Number of shafts and concentrators       6    
Number of concentrators on site | concentrator       4    
Mimosa            
Accounting policies            
Proportion of ownership interest in associate       50.00%    
Rustenburg operation            
Accounting policies            
Number of operating vertical shafts       3    
Number of operating decline shafts       2    
Number of concentrating plants | plant       2    
Number of mining tailing dams | miningTailingDam       1    
Rustenburg operation | Kroondal Mine            
Accounting policies            
Percentage of voting equity interests acquired     50.00% 50.00%   50.00%
Kroondal            
Accounting policies            
Number of operating decline shafts       4    
Number of concentrating plants | plant       2    
Number of storage facilities | facility       3