v3.26.1
Borrowings and derivative financial instrument - Keliber facilities (Details)
€ in Millions, R in Millions
 12 Months Ended
Dec. 31, 2025
ZAR (R)
Dec. 31, 2024
ZAR (R)
Dec. 31, 2023
ZAR (R)
Dec. 31, 2025
EUR (€)
Reconciliation Of Changes In Borrowings [Abstract]        
Balance at beginning of the year R 41,687 R 36,618 R 22,728  
Loans raised 7,912 8,278 14,431  
Unwinding of amortised cost 640 688 359  
Accrued interest 1,793 1,946 1,192  
Accrued interest paid (2,086) (1,947) (1,175)  
(Gain)/loss on foreign exchange differences (155) 215 (1,973)  
Balance at end of the year 43,257 41,687 36,618  
Current portion of balance (11,402) (552) (11,672)  
Non-current portion of balance 31,855 41,135 24,946  
Keliber loan facilities        
Disclosure of detailed information about borrowings [line items]        
Face amount of debt 500      
Reconciliation Of Changes In Borrowings [Abstract]        
Balance at beginning of the year 5,724 0 0  
Loans raised 3,851 5,618 0  
Unwinding of amortised cost 60 8 0  
Accrued interest 350 64 0  
Accrued interest paid (293) 0 0  
(Gain)/loss on foreign exchange differences (145) 34 0  
Balance at end of the year 9,547 5,724 0  
Current portion of balance (116) (66) 0  
Non-current portion of balance R 9,431 R 5,658 R 0  
Keliber loan facilities | Minimum        
Disclosure of detailed information about borrowings [line items]        
Net debt to EBITDA threshold 2.5      
Keliber loan facilities | Maximum        
Disclosure of detailed information about borrowings [line items]        
Net debt to EBITDA threshold 3.0      
ECA facility        
Disclosure of detailed information about borrowings [line items]        
Face amount of debt R 250     € 250
Term of facility 7 years      
ECA facility | EURIBOR        
Disclosure of detailed information about borrowings [line items]        
Interest rate margin 1.30%     1.30%
EIB facility        
Disclosure of detailed information about borrowings [line items]        
Face amount of debt R 150     € 150
Term of facility 8 years      
EIB facility | EURIBOR        
Disclosure of detailed information about borrowings [line items]        
Interest rate margin 2.05%     2.05%
Commercial bank facility        
Disclosure of detailed information about borrowings [line items]        
Face amount of debt R 100     € 100
Term of facility 7 years      
Commercial bank facility | Mid-range        
Disclosure of detailed information about borrowings [line items]        
Interest rate margin 2.30%     2.30%
Commercial bank facility | Top of range        
Disclosure of detailed information about borrowings [line items]        
Interest rate margin 2.50%     2.50%
Commercial bank facility | EURIBOR | Bottom of range        
Disclosure of detailed information about borrowings [line items]        
Interest rate margin 2.10%     2.10%