Revenue - Accounting policy (Details)	12 Months Ended
Revenue - Accounting policy (Details)	Dec. 31, 2025
PGMs \| Minimum
Disclosure of disaggregation of revenue from contracts with customers [line items]
Period between provisional invoicing and final pricing	1 month
PGMs \| Maximum
Disclosure of disaggregation of revenue from contracts with customers [line items]
Period between provisional invoicing and final pricing	4 months
Zinc \| Minimum
Disclosure of disaggregation of revenue from contracts with customers [line items]
Period between provisional invoicing and final pricing	1 month
Zinc \| Maximum
Disclosure of disaggregation of revenue from contracts with customers [line items]
Period between provisional invoicing and final pricing	4 months