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Related parties - Summary of Remuneration to Related Parties (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of transactions between related parties [line items]      
Salary $ 399,700,000 $ 397,400,000 $ 397,800,000
Share-based payments 9,100,000 6,900,000 $ 12,700,000
Non executive directors      
Disclosure of transactions between related parties [line items]      
Directors' fees 851,700 826,800  
Board fees committee fees 362,100 534,500  
Total 1,213,800 1,361,300  
Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total 15,645,000 19,583,900  
Salary 5,135,100 5,972,300  
Pension fund contributions 624,800 679,800  
Cash incentive 1,566,300 3,559,000  
Other 2,261,200 3,257,500  
Share-based payments 6,057,600 6,115,300  
C Carolus | Non executive directors      
Disclosure of transactions between related parties [line items]      
Directors' fees   85,400  
Board fees committee fees   0  
Total   85,400  
Y Suleman | Non executive directors      
Disclosure of transactions between related parties [line items]      
Directors' fees 197,500 153,200  
Board fees committee fees 0 26,800  
Total 197,500 180,000.0  
P Bacchus | Non executive directors      
Disclosure of transactions between related parties [line items]      
Directors' fees 89,300 85,200  
Board fees committee fees 66,800 126,200  
Total 156,100 211,400  
S Reid | Non executive directors      
Disclosure of transactions between related parties [line items]      
Directors' fees 128,600 137,100  
Board fees committee fees 0 0  
Total 128,600 137,100  
T Goodlace | Non executive directors      
Disclosure of transactions between related parties [line items]      
Directors' fees 64,800 69,100  
Board fees committee fees 44,100 71,900  
Total 108,900 141,000.0  
A Andani | Non executive directors      
Disclosure of transactions between related parties [line items]      
Directors' fees 89,300 85,200  
Board fees committee fees 65,100 102,400  
Total 154,400 187,600  
P Sibiya | Non executive directors      
Disclosure of transactions between related parties [line items]      
Directors' fees 64,800 69,100  
Board fees committee fees 53,200 86,100  
Total 118,000.0 155,200  
J McGill | Non executive directors      
Disclosure of transactions between related parties [line items]      
Directors' fees 89,300 85,200  
Board fees committee fees 72,000.0 74,300  
Total 161,300 159,500  
C Bitar | Non executive directors      
Disclosure of transactions between related parties [line items]      
Directors' fees 89,300 57,300  
Board fees committee fees 52,100 46,800  
Total 141,400 104,100  
C Smit | Non executive directors      
Disclosure of transactions between related parties [line items]      
Directors' fees 38,800    
Board fees committee fees 8,800    
Total 47,600    
Executive directors | Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total 4,153,000 7,050,600  
Salary 1,186,000 1,560,400  
Pension fund contributions 77,100 68,900  
Cash incentive 355,200 1,136,200  
Other 4,500 3,001,800  
Share-based payments 2,530,200 1,283,300  
M Preece | Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total 1,910,900 2,105,800  
Salary 594,300 515,000.0  
Pension fund contributions 29,000.0 25,200  
Cash incentive 177,300 410,400  
Other 2,100 1,400  
Share-based payments 1,108,200 1,153,800  
P Schmidt      
Disclosure of transactions between related parties [line items]      
Salary paid 142,750 135,300  
P Schmidt | Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total 2,242,100 1,953,400  
Salary 591,700 617,100  
Pension fund contributions 48,100 46,200  
Cash incentive 177,900 453,900  
Other 2,400 3,000.0  
Share-based payments 1,422,000 833,200  
C Griffith      
Disclosure of transactions between related parties [line items]      
Salary paid   336,501  
C Griffith | Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total   5,097,200  
Salary   943,300  
Pension fund contributions   22,700  
Cash incentive   682,300  
Other   2,998,800  
Share-based payments   450,100  
Prescribed officers | Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total 11,492,000 12,533,300  
Salary 3,949,100 4,411,900  
Pension fund contributions 547,700 610,900  
Cash incentive 1,211,100 2,422,800  
Other 2,256,700 255,700  
Share-based payments 3,527,400 4,832,000  
B Mokoatle | Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total 464,200    
Salary 167,800    
Pension fund contributions 40,800    
Cash incentive 98,100    
Other 900    
Share-based payments 156,600    
L Rivera | Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total 2,903,900 1,935,800  
Salary 816,100 853,000.0  
Pension fund contributions 220,000.0 362,800  
Cash incentive 0 0  
Other 790,700 0  
Share-based payments 1,077,100 720,000.0  
R Butcher | Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total   566,000.0  
Salary   396,900  
Pension fund contributions   14,300  
Cash incentive   235,700  
Other   163,900  
Share-based payments   (244,800)  
N Chohan | Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total 1,195,000 1,156,000  
Salary 309,700 347,300  
Pension fund contributions 45,800 30,200  
Cash incentive 94,700 232,500  
Other 4,300 900  
Share-based payments 740,500 545,100  
B Mattison      
Disclosure of transactions between related parties [line items]      
Salary paid 26,367 96,200  
B Mattison | Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total 171,600 1,503,000  
Salary 111,800 447,900  
Pension fund contributions 7,000.0 24,100  
Cash incentive 0 318,000.0  
Other 450,400 5,300  
Share-based payments (397,600) 707,700  
T Leishman | Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total 127,700 1,284,500  
Salary 85,400 354,800  
Pension fund contributions 7,700 25,100  
Cash incentive 0 251,700  
Other 355,700 1,100  
Share-based payments (321,100) 651,800  
A Nagaser | Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total 211,900 804,700  
Salary 115,100 251,200  
Pension fund contributions 14,100 26,100  
Cash incentive 0 174,000.0  
Other 255,700 10,900  
Share-based payments (173,000.0) 342,500  
S Mathews | Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total 1,884,800 1,402,900  
Salary 635,700 562,300  
Pension fund contributions 18,200 18,400  
Cash incentive 221,300 264,500  
Other 0 2,300  
Share-based payments 1,009,600 555,400  
R Bardien | Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total 1,170,700 918,500  
Salary 276,000.0 305,400  
Pension fund contributions 35,900 25,800  
Cash incentive 203,600 211,800  
Other 200 0  
Share-based payments 655,000.0 375,500  
J Mortoti | Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total 1,693,700 856,100  
Salary 696,200 378,100  
Pension fund contributions 127,100 58,900  
Cash incentive 308,600 324,200  
Other 84,300 69,900  
Share-based payments 477,500 $ 25,000.0  
K Carter | Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total 821,900    
Salary 371,900    
Pension fund contributions 15,200    
Cash incentive 126,900    
Other 5,100    
Share-based payments 302,800    
J Magagula | Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total 415,800    
Salary 84,800    
Pension fund contributions 14,800    
Cash incentive 26,200    
Other 290,000.0    
Share-based payments 0    
F Swanepoel | Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total 430,800    
Salary 278,600    
Pension fund contributions 1,100    
Cash incentive 131,700    
Other 19,400    
Share-based payments $ 0