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Related parties - Summary of Remuneration to Related Parties (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of transactions between related parties [line items]      
Salary $ 397,800,000 $ 352,500,000 $ 334,800,000
Share-based payments 12,700,000 14,500,000 $ 20,500,000
Termination benefits expense $ 215,881    
MSR policy      
Disclosure of transactions between related parties [line items]      
Bonus deferred, percentage 40.00%    
Deferred bonus converted to restricted shares   78,398  
Annual performance bonus   195,995  
Non executive directors      
Disclosure of transactions between related parties [line items]      
Directors' fees $ 786,100 833,600  
Board fees committee fees 397,200 386,700  
Total 1,183,300 1,220,300  
Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total 27,927,400 23,646,300  
Salary 6,706,200 6,239,700  
Pension fund contributions 852,400 630,500  
Cash incentive 4,645,700 3,795,500  
Other 4,792,200 661,800  
Share-based payments 10,930,900 12,318,800  
C Carolus | Non executive directors      
Disclosure of transactions between related parties [line items]      
Directors' fees 223,700 194,900  
Board fees committee fees 0 0  
Total 223,700 194,900  
R Menell | Non executive directors      
Disclosure of transactions between related parties [line items]      
Directors' fees 27,900 126,900  
Board fees committee fees 0 0  
Total 27,900 126,900  
Y Suleman | Non executive directors      
Disclosure of transactions between related parties [line items]      
Directors' fees 73,400 63,400  
Board fees committee fees 75,600 64,300  
Total 149,000.0 127,700  
P Bacchus | Non executive directors      
Disclosure of transactions between related parties [line items]      
Directors' fees 83,100 80,400  
Board fees committee fees 90,200 84,200  
Total 173,300 164,600  
S Reid | Non executive directors      
Disclosure of transactions between related parties [line items]      
Directors' fees 104,500 80,400  
Board fees committee fees 47,700 56,400  
Total 152,200 136,800  
Services received from related party 36,825 34,960  
T Goodlace | Non executive directors      
Disclosure of transactions between related parties [line items]      
Directors' fees 73,400 63,400  
Board fees committee fees 56,900 44,100  
Total 130,300 107,500  
A Andani | Non executive directors      
Disclosure of transactions between related parties [line items]      
Directors' fees 83,100 80,400  
Board fees committee fees 50,200 42,000.0  
Total 133,300 122,400  
Services received from related party 74,025 69,682  
C Letton | Non executive directors      
Disclosure of transactions between related parties [line items]      
Directors' fees 34,400 80,400  
Board fees committee fees 28,300 68,000.0  
Total 62,700 148,400  
P Mahanyele-Dabengwa | Non executive directors      
Disclosure of transactions between related parties [line items]      
Directors' fees 12,000.0 63,400  
Board fees committee fees 5,100 27,700  
Total 17,100 91,100  
P Sibiya | Non executive directors      
Disclosure of transactions between related parties [line items]      
Directors' fees 61,400    
Board fees committee fees 43,200    
Total 104,600    
J McGill | Non executive directors      
Disclosure of transactions between related parties [line items]      
Directors' fees 9,200    
Board fees committee fees 0    
Total 9,200    
Executive Directors [member] | Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total 8,280,900 6,834,800  
Salary 1,679,900 1,748,500  
Pension fund contributions 72,700 64,300  
Cash incentive 1,959,600 1,350,900  
Other 762,200 4,800  
Share-based payments 3,806,500 3,666,300  
C Griffith      
Disclosure of transactions between related parties [line items]      
Salary paid 244,500 0  
C Griffith | Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total 1,788,100    
Salary 719,500    
Pension fund contributions 17,700    
Cash incentive 748,200    
Other 0    
Share-based payments 302,700    
NHolland      
Disclosure of transactions between related parties [line items]      
Salary paid 106,950 424,550  
NHolland | Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total 3,926,500 4,079,400  
Salary 318,500 1,174,200  
Pension fund contributions 6,100 21,700  
Cash incentive 741,100 904,300  
Other 757,300 3,100  
Share-based payments 2,103,500 1,976,100  
Other long-term employee benefits $ 2,500    
Employment period 25 years    
PSchmidt      
Disclosure of transactions between related parties [line items]      
Salary paid $ 131,500 129,600  
PSchmidt | Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total 2,566,300 2,755,400  
Salary 641,900 574,300  
Pension fund contributions 48,900 42,600  
Cash incentive 470,300 446,600  
Other 4,900 1,700  
Share-based payments 1,400,300 1,690,200  
Prescribed Officers | Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total 19,646,500 16,811,500  
Salary 5,026,300 4,491,200  
Pension fund contributions 779,700 566,200  
Cash incentive 2,686,100 2,444,600  
Other 4,030,000 657,000.0  
Share-based payments 7,124,400 8,652,500  
L Rivera | Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total 2,619,200 2,375,500  
Salary 812,800 708,600  
Pension fund contributions 335,700 130,400  
Cash incentive 0 0  
Other 451,000.0 389,400  
Share-based payments 1,019,700 1,147,100  
A Baku | Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total 6,356,700 3,441,300  
Salary 874,100 859,300  
Pension fund contributions 201,100 197,700  
Cash incentive 530,400 564,100  
Other 3,533,400 184,300  
Share-based payments 1,217,700 1,635,900  
R Butcher | Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total 1,170,900 1,215,900  
Salary 429,300 382,800  
Pension fund contributions 36,900 38,300  
Cash incentive 261,200 235,400  
Other 0 0  
Share-based payments 443,500 559,400  
N Chohan | Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total 1,313,500 1,397,900  
Salary 368,000.0 318,700  
Pension fund contributions 32,000.0 27,000.0  
Cash incentive 263,700 227,400  
Other 1,200 1,800  
Share-based payments 648,600 823,000.0  
B Mattison      
Disclosure of transactions between related parties [line items]      
Salary paid 93,500 92,100  
B Mattison | Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total 1,627,100 1,870,200  
Salary 466,200 416,800  
Pension fund contributions 25,500 22,200  
Cash incentive 306,800 281,100  
Other 1,700 100  
Share-based payments 826,900 1,150,000  
T Leishman | Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total 1,307,400 1,484,900  
Salary 375,900 327,500  
Pension fund contributions 26,600 23,100  
Cash incentive 251,300 224,700  
Other 1,500 53,000.0  
Share-based payments 652,100 856,600  
A Nagaser | Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total 884,200 938,000.0  
Salary 266,100 229,500  
Pension fund contributions 27,600 23,800  
Cash incentive 183,400 158,100  
Other 11,100 400  
Share-based payments 396,000.0 526,200  
S Mathews | Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total 1,762,500 1,815,300  
Salary 564,700 493,600  
Pension fund contributions 40,200 56,900  
Cash incentive 337,000.0 333,600  
Other 27,300 25,100  
Share-based payments 793,300 906,100  
M Preece | Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total 1,520,800 1,312,500  
Salary 545,600 475,400  
Pension fund contributions 26,700 23,200  
Cash incentive 333,100 302,600  
Other 1,000.0 2,900  
Share-based payments 614,400 508,400  
R Bardien | Key management personnel of entity or parent      
Disclosure of transactions between related parties [line items]      
Total 1,084,200 960,000.0  
Salary 323,600 279,000.0  
Pension fund contributions 27,400 23,600  
Cash incentive 219,200 117,600  
Other 1,800 0  
Share-based payments $ 512,200 $ 539,800