v3.26.1
Borrowings and derivative financial instrument - Burnstone Debt (Details)
R in Millions, $ in Millions
 12 Months Ended
Jul. 01, 2017
USD ($)
Dec. 31, 2025
ZAR (R)
R / kg
R / $
Dec. 31, 2024
ZAR (R)
R / kg
R / $
Dec. 31, 2023
ZAR (R)
R / $
R / kg
Jul. 01, 2014
USD ($)
Disclosure of detailed information about borrowings [line items]          
Borrowings   R 43,257 R 41,687 R 36,618  
Reconciliation Of Changes In Borrowings [Abstract]          
Balance at beginning of the year   41,687 36,618 22,728  
Unwinding of amortised cost   640 688 359  
Loss/(gain) on revised estimated cash flows   1,805 (1,053) (32)  
(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  
Burnstone Debt          
Disclosure of detailed information about borrowings [line items]          
Borrowings   4,005 2,260 2,991 $ 178.0
Bank Lenders participation in Burnstone free cash flow after Burnstone Debt repaid in full 10.00%        
Maximum participation in Burnstone free cash flow after Burnstone Debt repaid in full | $ $ 63.0        
Net assets   2,000      
Reconciliation Of Changes In Borrowings [Abstract]          
Balance at beginning of the year   2,260 2,991 2,540  
Unwinding of amortised cost   221 284 252  
Loss/(gain) on revised estimated cash flows   1,805 (1,053) (32)  
(Gain)/loss on foreign exchange differences   (281) 38 231  
Balance at end of the year   4,005 2,260 2,991  
Current portion of balance   0 0 0  
Non-current portion of balance   R 4,005 R 2,260 R 2,991  
Revised gold prices (ZAR/kg) | R / kg   1,670,512 1,189,493 1,012,625  
Exchange rates (in ZAR per USD) | R / $   17.25 18.00 18.50  
Life-of-mine   23 years      
A1          
Disclosure of detailed information about borrowings [line items]          
Face amount of debt | $         0.2
A2          
Disclosure of detailed information about borrowings [line items]          
Face amount of debt | $         7.8
Free cash flow used to repay Wits Gold Loan (as a percent) 50.00%        
Free cash flow used to repay Burnstone Debt (as a percent) 50.00%        
Reconciliation Of Changes In Borrowings [Abstract]          
Nominal discount rate   5.90%      
A3 and A4          
Disclosure of detailed information about borrowings [line items]          
Interest rate margin 4.00%        
Free cash flow used to repay Wits Gold Loan (as a percent) 90.00%        
Free cash flow used to repay Burnstone Debt (as a percent) 10.00%        
Free cash flow used to repay Burnstone Debt after settlement of Wits Gold Loan (as a percent) 30.00%        
Reconciliation Of Changes In Borrowings [Abstract]          
Nominal discount rate   9.50%      
A3          
Disclosure of detailed information about borrowings [line items]          
Face amount of debt | $         51.0
A4          
Disclosure of detailed information about borrowings [line items]          
Face amount of debt | $         $ 119.1