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Goodwill and other intangibles - Impairment sensitivity (Details)
12 Months Ended
Dec. 31, 2024
R / oz
$ / t
Marikana | Average 4E PGM basket price  
Disclosure of reconciliation of changes in goodwill [line items]  
Value of key assumption (in ZAR per ounce/USD per tonne) 26,380
Percentage of reasonably possible increase in unobservable input, assets 4.30%
Percentage of reasonably possible decrease in unobservable input, assets 4.30%
Keliber | Average lithium hydroxide price  
Disclosure of reconciliation of changes in goodwill [line items]  
Value of key assumption (in ZAR per ounce/USD per tonne) | $ / t 18,640
Percentage of reasonably possible increase in unobservable input, assets 0.10%
Percentage of reasonably possible decrease in unobservable input, assets 0.10%
Mimosa | Average 4E PGM basket price  
Disclosure of reconciliation of changes in goodwill [line items]  
Value of key assumption (in ZAR per ounce/USD per tonne) 25,433
Percentage of reasonably possible increase in unobservable input, assets 0.10%
Percentage of reasonably possible decrease in unobservable input, assets 0.10%
Stillwater Mining Company | Section 45X tax credit  
Disclosure of reconciliation of changes in goodwill [line items]  
Percentage of reasonably possible increase in unobservable input, assets 1.00%
Percentage of reasonably possible decrease in unobservable input, assets 1.00%
Effect on recoverable amount due to 1% increase 12.00%
Effect on recoverable amount due to 1% decrease 12.00%