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Post-retirement benefit obligations - Actuarial Assumptions (Details)
Jun. 30, 2023
Apr. 30, 2023
Mar. 31, 2023
Jun. 30, 2022
Apr. 30, 2022
Mar. 31, 2022
South Africa            
Post-retirement benefit obligations            
Healthcare cost inflation     7.50%     7.50%
Pension increase assumption     5.80%     5.10%
Average salary increases     5.50%     5.50%
South Africa | Pension            
Post-retirement benefit obligations            
Discount rate     12.90%     12.40%
Weighted average duration of the obligation     11 years     12 years
South Africa | Healthcare            
Post-retirement benefit obligations            
Discount rate     13.00%     12.40%
Weighted average duration of the obligation     13 years     14 years
United States of America            
Post-retirement benefit obligations            
Average salary increases 4.20%     4.20%    
United States of America | Pension            
Post-retirement benefit obligations            
Discount rate 4.90%     4.20%    
Weighted average duration of the obligation 4 years     4 years    
United States of America | Healthcare            
Post-retirement benefit obligations            
Discount rate 4.90%     4.30%    
Weighted average duration of the obligation 10 years     10 years    
Europe            
Post-retirement benefit obligations            
Pension increase assumption   2.20%     2.20%  
Average salary increases   3.20%     3.20%  
Europe | Pension            
Post-retirement benefit obligations            
Discount rate   3.70%     2.50%  
Weighted average duration of the obligation   15 years     16 years