v3.26.1
Goodwill and other intangibles - Estimates and Assumptions Used in the Calculation of Goodwill (Details)
 6 Months Ended 12 Months Ended
Jun. 30, 2025
R / oz
Dec. 31, 2025
R / kg
$ / t
$ / oz
R / oz
Dec. 31, 2024
$ / t
R / kg
$ / oz
R / oz
Dec. 31, 2023
R / kg
$ / lb
$ / t
$ / t
R / oz
$ / oz
Disclosure of reconciliation of changes in goodwill [line items]        
Average lithium hydroxide price (in USD per tonne) | $ / t   17,475 18,640 22,933
Keliber        
Disclosure of reconciliation of changes in goodwill [line items]        
Nominal discount rate   10.10% 9.90% 10.10%
Inflation rate   2.00% 2.00% 2.00%
Mimosa        
Disclosure of reconciliation of changes in goodwill [line items]        
Average PGM (4E) basket price (in ZAR per ounce) | R / oz 25,745     26,632
Burnstone Debt        
Disclosure of reconciliation of changes in goodwill [line items]        
Life-of-mine   23 years    
Revised gold prices (ZAR/kg) | R / kg   1,670,512 1,189,493 1,012,625
Europe (EU)        
Disclosure of reconciliation of changes in goodwill [line items]        
Life-of-mine       23 years
Australia        
Disclosure of reconciliation of changes in goodwill [line items]        
Life-of-mine       40 months
Minimum | Europe (EU)        
Disclosure of reconciliation of changes in goodwill [line items]        
Life-of-mine   1 year 2 years  
Minimum | Australia        
Disclosure of reconciliation of changes in goodwill [line items]        
Life-of-mine   1 year 5 years  
Maximum | Europe (EU)        
Disclosure of reconciliation of changes in goodwill [line items]        
Life-of-mine   26 years 23 years  
Maximum | Australia        
Disclosure of reconciliation of changes in goodwill [line items]        
Life-of-mine   18 years 19 years  
Mining assets | Keliber        
Disclosure of reconciliation of changes in goodwill [line items]        
Life-of-mine   20 years 23 years 24 years
Mining assets | Mimosa        
Disclosure of reconciliation of changes in goodwill [line items]        
Life-of-mine 8 years     11 years
Mimosa | Mining assets        
Disclosure of reconciliation of changes in goodwill [line items]        
Nominal discount rate     22.70% 31.20%
Burnstone | Mining assets        
Disclosure of reconciliation of changes in goodwill [line items]        
Nominal discount rate   15.20% 17.50% 18.90%
Total SA gold        
Disclosure of reconciliation of changes in goodwill [line items]        
Average gold price (in ZAR per kilogram) | R / kg   1,903,056 1,324,530 1,072,364
Total SA gold | South Africa | Burnstone Debt        
Disclosure of reconciliation of changes in goodwill [line items]        
Inflation rate   3.50% 5.00% 6.00%
Total SA gold | Minimum | South Africa        
Disclosure of reconciliation of changes in goodwill [line items]        
Nominal discount rate   11.70% 14.30% 13.70%
Total SA gold | Maximum | South Africa        
Disclosure of reconciliation of changes in goodwill [line items]        
Nominal discount rate   13.50% 15.70% 15.80%
Total SA gold | Mining assets | Burnstone Debt        
Disclosure of reconciliation of changes in goodwill [line items]        
Life-of-mine   23 years 25 years 25 years
Total SA gold | Mining assets | Minimum        
Disclosure of reconciliation of changes in goodwill [line items]        
Life-of-mine   1 year 4 years 4 years
Total SA gold | Mining assets | Maximum        
Disclosure of reconciliation of changes in goodwill [line items]        
Life-of-mine   11 years 10 years 11 years
PGM operations        
Disclosure of reconciliation of changes in goodwill [line items]        
Average PGM (4E) basket price (in ZAR per ounce) | R / oz   28,890 26,963 29,124
Average PGM (2E) basket price (in USD per ounce) | $ / oz   1,134 1,120 1,281
PGM operations | Mimosa        
Disclosure of reconciliation of changes in goodwill [line items]        
Average PGM (4E) basket price (in ZAR per ounce) | R / oz     25,433 26,632
PGM operations | South Africa        
Disclosure of reconciliation of changes in goodwill [line items]        
Inflation rate   3.50% 5.00% 6.00%
PGM operations | United States        
Disclosure of reconciliation of changes in goodwill [line items]        
Nominal discount rate   11.60% 13.00% 12.00%
Inflation rate   2.20% 2.10% 2.50%
PGM operations | Minimum | South Africa        
Disclosure of reconciliation of changes in goodwill [line items]        
Nominal discount rate   13.90% 21.30% 22.50%
PGM operations | Maximum | South Africa        
Disclosure of reconciliation of changes in goodwill [line items]        
Nominal discount rate   16.30% 21.50% 22.70%
PGM operations | Mining assets | Minimum        
Disclosure of reconciliation of changes in goodwill [line items]        
Life-of-mine   1 year 13 years 14 years
PGM operations | Mining assets | Maximum        
Disclosure of reconciliation of changes in goodwill [line items]        
Life-of-mine   66 years 45 years 47 years
Europe (Sandouville nickel refinery)        
Disclosure of reconciliation of changes in goodwill [line items]        
Average nickel price (in USD per lbs) | $ / lb       8.9
Average cobalt price (in USD per lbs) | $ / lb       15.8
Europe (Sandouville nickel refinery) | Europe (EU)        
Disclosure of reconciliation of changes in goodwill [line items]        
Nominal discount rate       7.40%
Inflation rate       1.60%
Europe (Sandouville nickel refinery) | Mining assets        
Disclosure of reconciliation of changes in goodwill [line items]        
Life-of-mine       23 years
Century segment        
Disclosure of reconciliation of changes in goodwill [line items]        
Average zinc price (in AUD per tonne) | $ / t       3,873
Century segment | Australia        
Disclosure of reconciliation of changes in goodwill [line items]        
Nominal discount rate       9.30%
Inflation rate       2.90%
Century segment | Mining assets        
Disclosure of reconciliation of changes in goodwill [line items]        
Life-of-mine       4 years
Pennsylvania site recycling        
Disclosure of reconciliation of changes in goodwill [line items]        
Average gold price (in ZAR per kilogram) | $ / oz   3,562 2,329  
Average zinc price (in USD per oz) | $ / oz   44 29  
Pennsylvania site recycling | United States        
Disclosure of reconciliation of changes in goodwill [line items]        
Nominal discount rate   13.10% 15.30%  
Inflation rate   2.20% 2.10%