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Related parties - Summary of Remuneration to Related Parties (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of transactions between related parties [line items]      
Salary $ 397,400,000 $ 397,800,000 $ 352,500,000
Share-based payments 6,900,000 12,700,000 $ 14,500,000
Termination benefits expense 215,881    
Non executive directors      
Disclosure of transactions between related parties [line items]      
Directors' fees 826,800 786,100  
Board fees committee fees 534,500 397,200  
Total 1,361,300 1,183,300  
Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total 19,583,900 27,927,400  
Salary 5,972,300 6,706,200  
Pension fund contributions 679,800 852,400  
Cash incentive 3,559,000 4,645,700  
Other 3,257,500 4,792,200  
Share-based payments 6,115,300 10,930,900  
C Carolus | Non executive directors      
Disclosure of transactions between related parties [line items]      
Directors' fees 85,400 223,700  
Board fees committee fees 0 0  
Total 85,400 223,700  
R Menell | Non executive directors      
Disclosure of transactions between related parties [line items]      
Directors' fees   27,900  
Board fees committee fees   0  
Total   27,900  
Y Suleman | Non executive directors      
Disclosure of transactions between related parties [line items]      
Directors' fees 153,200 73,400  
Board fees committee fees 26,800 75,600  
Total 180,000.0 149,000.0  
P Bacchus | Non executive directors      
Disclosure of transactions between related parties [line items]      
Directors' fees 85,200 83,100  
Board fees committee fees 126,200 90,200  
Total 211,400 173,300  
S Reid | Non executive directors      
Disclosure of transactions between related parties [line items]      
Directors' fees 137,100 104,500  
Board fees committee fees 0 47,700  
Total 137,100 152,200  
Services received from related party 32,906 36,825  
T Goodlace | Non executive directors      
Disclosure of transactions between related parties [line items]      
Directors' fees 69,100 73,400  
Board fees committee fees 71,900 56,900  
Total 141,000.0 130,300  
A Andani | Non executive directors      
Disclosure of transactions between related parties [line items]      
Directors' fees 85,200 83,100  
Board fees committee fees 102,400 50,200  
Total 187,600 133,300  
Services received from related party 79,882 74,025  
P Sibiya | Non executive directors      
Disclosure of transactions between related parties [line items]      
Directors' fees 69,100 61,400  
Board fees committee fees 86,100 43,200  
Total 155,200 104,600  
J McGill | Non executive directors      
Disclosure of transactions between related parties [line items]      
Directors' fees 85,200 9,200  
Board fees committee fees 74,300 0  
Total 159,500 9,200  
C Bitar | Non executive directors      
Disclosure of transactions between related parties [line items]      
Directors' fees 57,300    
Board fees committee fees 46,800    
Total 104,100    
C Letton | Non executive directors      
Disclosure of transactions between related parties [line items]      
Directors' fees   34,400  
Board fees committee fees   28,300  
Total   62,700  
P Mahanyele | Non executive directors      
Disclosure of transactions between related parties [line items]      
Directors' fees   12,000.0  
Board fees committee fees   5,100  
Total   17,100  
Executive Directors [member] | Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total 7,050,600 8,280,900  
Salary 1,560,400 1,679,900  
Pension fund contributions 68,900 72,700  
Cash incentive 1,136,200 1,959,600  
Other 3,001,800 762,200  
Share-based payments 1,283,300 3,806,500  
C Griffith      
Disclosure of transactions between related parties [line items]      
Salary paid 336,501 244,500  
C Griffith | Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total 5,097,200 1,788,100  
Salary 943,300 719,500  
Pension fund contributions 22,700 17,700  
Cash incentive 682,300 748,200  
Other 2,998,800 0  
Share-based payments 450,100 302,700  
N Holland      
Disclosure of transactions between related parties [line items]      
Salary paid 0 106,950  
N Holland | Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total   3,926,500  
Salary   318,500  
Pension fund contributions   6,100  
Cash incentive   741,100  
Other   757,300  
Share-based payments   2,103,500  
P Schmidt      
Disclosure of transactions between related parties [line items]      
Salary paid 135,300 131,500  
P Schmidt | Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total 1,953,400 2,566,300  
Salary 617,100 641,900  
Pension fund contributions 46,200 48,900  
Cash incentive 453,900 470,300  
Other 3,000.0 4,900  
Share-based payments 833,200 1,400,300  
Prescribed Officers | Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total 12,533,300 19,646,500  
Salary 4,411,900 5,026,300  
Pension fund contributions 610,900 779,700  
Cash incentive 2,422,800 2,686,100  
Other 255,700 4,030,000  
Share-based payments 4,832,000 7,124,400  
M Preece | Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total 2,105,800 1,520,800  
Salary 515,000.0 545,600  
Pension fund contributions 25,200 26,700  
Cash incentive 410,400 333,100  
Other 1,400 1,000.0  
Share-based payments 1,153,800 614,400  
L Rivera | Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total 1,935,800 2,619,200  
Salary 853,000.0 812,800  
Pension fund contributions 362,800 335,700  
Cash incentive 0 0  
Other 0 451,000.0  
Share-based payments 720,000.0 1,019,700  
A Baku | Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total   6,356,700  
Salary   874,100  
Pension fund contributions   201,100  
Cash incentive   530,400  
Other   3,533,400  
Share-based payments   1,217,700  
R Butcher | Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total 566,000.0 1,170,900  
Salary 396,900 429,300  
Pension fund contributions 14,300 36,900  
Cash incentive 235,700 261,200  
Other 163,900 0  
Share-based payments (244,800) 443,500  
N Chohan | Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total 1,156,000 1,313,500  
Salary 347,300 368,000.0  
Pension fund contributions 30,200 32,000.0  
Cash incentive 232,500 263,700  
Other 900 1,200  
Share-based payments 545,100 648,600  
B Mattison      
Disclosure of transactions between related parties [line items]      
Salary paid 96,200 93,500  
B Mattison | Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total 1,503,000 1,627,100  
Salary 447,900 466,200  
Pension fund contributions 24,100 25,500  
Cash incentive 318,000.0 306,800  
Other 5,300 1,700  
Share-based payments 707,700 826,900  
T Leishman | Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total 1,284,500 1,307,400  
Salary 354,800 375,900  
Pension fund contributions 25,100 26,600  
Cash incentive 251,700 251,300  
Other 1,100 1,500  
Share-based payments 651,800 652,100  
A Nagaser | Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total 804,700 884,200  
Salary 251,200 266,100  
Pension fund contributions 26,100 27,600  
Cash incentive 174,000.0 183,400  
Other 10,900 11,100  
Share-based payments 342,500 396,000.0  
S Mathews | Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total 1,402,900 1,762,500  
Salary 562,300 564,700  
Pension fund contributions 18,400 40,200  
Cash incentive 264,500 337,000.0  
Other 2,300 27,300  
Share-based payments 555,400 793,300  
R Bardien | Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total 918,500 1,084,200  
Salary 305,400 323,600  
Pension fund contributions 25,800 27,400  
Cash incentive 211,800 219,200  
Other 0 1,800  
Share-based payments 375,500 $ 512,200  
J Mortoti | Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total 856,100    
Salary 378,100    
Pension fund contributions 58,900    
Cash incentive 324,200    
Other 69,900    
Share-based payments $ 25,000.0