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Related parties - Summary of Remuneration to Related Parties (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of transactions between related parties [line items]      
Salary $ 334,800,000 $ 392,800,000 $ 414,700,000
Pension Fund Contribution    
Cash Incentive    
other    
Share - based expense 20,500,000 37,500,000 $ 26,800,000
Non Executive Directors [member]      
Disclosure of transactions between related parties [line items]      
Directors fees 885,900 912,600  
Committee fees 364,900 341,300  
Total remuneration 1,250,800 1,253,900  
Key management personnel of entity or parent [member]      
Disclosure of transactions between related parties [line items]      
Salary 6,245,800 6,427,500  
Pension Fund Contribution 560,100 557,300  
Cash Incentive 3,951,200 3,368,700  
other 363,800 580,800  
Share - based expense 10,156,600 5,980,200  
LTIP expense 0 129,400  
Total remuneration 21,277,500 17,044,000  
C Carolus [Member] | Non Executive Directors [member]      
Disclosure of transactions between related parties [line items]      
Directors fees 215,800 231,300  
Committee fees 0 0  
Total remuneration 215,800 231,300  
R Menell [Member] | Non Executive Directors [member]      
Disclosure of transactions between related parties [line items]      
Directors fees 140,500 150,500  
Committee fees 0 0  
Total remuneration 140,500 150,500  
D Ncube [Member] | Non Executive Directors [member]      
Disclosure of transactions between related parties [line items]      
Directors fees   30,700  
Committee fees   21,300  
Total remuneration   52,000  
Y Suleman [Member] | Non Executive Directors [member]      
Disclosure of transactions between related parties [line items]      
Directors fees 70,800 75,900  
Committee fees 65,700 72,400  
Total remuneration 138,500 148,300  
P Bacchus [Member] | Non Executive Directors [member]      
Disclosure of transactions between related parties [line items]      
Directors fees 79,300 80,600  
Committee fees 72,900 61,100  
Total remuneration 152,200 141,700  
S Reid [Member] | Non Executive Directors [member]      
Disclosure of transactions between related parties [line items]      
Directors fees 79,300 80,600  
Committee fees 62,900 55,400  
Total remuneration 142,200 136,000  
T Goodlace [Member] | Non Executive Directors [member]      
Disclosure of transactions between related parties [line items]      
Directors fees 70,800 75,900  
Committee fees 35,800 38,400  
Total remuneration 106,600 114,300  
A Andani [Member] | Non Executive Directors [member]      
Disclosure of transactions between related parties [line items]      
Directors fees 79,300 80,600  
Committee fees 46,000 40,200  
Total remuneration 125,300 120,800  
C Letton [Member] | Non Executive Directors [member]      
Disclosure of transactions between related parties [line items]      
Directors fees 79,300 80,600  
Committee fees 51,600 49,800  
Total remuneration 130,900 130,400  
P Mahanyele-Dabengwa [Member] | Non Executive Directors [member]      
Disclosure of transactions between related parties [line items]      
Directors fees 70,800 25,900  
Committee fees 30,000 2,700  
Total remuneration 100,800 28,600  
N Holland [Member] | Key management personnel of entity or parent [member]      
Disclosure of transactions between related parties [line items]      
Salary 1,226,800 1,251,600  
Pension Fund Contribution 24,200 26,500  
Cash Incentive 913,400 661,500  
other 100 0  
Share - based expense 1,936,500 1,654,800  
LTIP expense 0 25,500  
Total remuneration 4,101,000 3,619,900  
P Schmidt [Member] | Key management personnel of entity or parent [member]      
Disclosure of transactions between related parties [line items]      
Salary 608,300 626,600  
Pension Fund Contribution   48,200  
Cash Incentive   306,200  
other   2,100  
Share - based expense 1,331,700 876,200  
LTIP expense 0 25,300  
Total remuneration 2,487,400 1,884,500  
Executive Directors [member] | Key management personnel of entity or parent [member]      
Disclosure of transactions between related parties [line items]      
Salary 1,835,100 1,878,200  
Pension Fund Contribution   74,700  
Cash Incentive   967,700  
other   2,100  
Share - based expense 3,268,200 2,531,000  
LTIP expense 0 50,800  
Total remuneration 6,588,400 5,504,400  
L Rivera [Member] | Key management personnel of entity or parent [member]      
Disclosure of transactions between related parties [line items]      
Salary 553,500 668,800  
Pension Fund Contribution 58,500 72,800  
Cash Incentive 142,600 132,900  
other 241,800 386,800  
Share - based expense 780,900 202,600  
LTIP expense 0 0  
Total remuneration 1,777,300 1,463,900  
A Baku [Member] | Key management personnel of entity or parent [member]      
Disclosure of transactions between related parties [line items]      
Salary 839,700 808,000  
Pension Fund Contribution 193,100 185,800  
Cash Incentive 533,300 634,800  
other 103,800 68,000  
Share - based expense 1,573,100 990,400  
LTIP expense 0 25,500  
Total remuneration 3,243,000 2,712,500  
R Butcher [Member] | Key management personnel of entity or parent [member]      
Disclosure of transactions between related parties [line items]      
Salary 363,400 384,500  
Pension Fund Contribution 36,300 37,300  
Cash Incentive 218,000 192,400  
other 0 0  
Share - based expense 501,100 238,500  
LTIP expense 0 0  
Total remuneration 1,118,800 852,700  
N Chohan [Member] | Key management personnel of entity or parent [member]      
Disclosure of transactions between related parties [line items]      
Salary 352,800 367,200  
Pension Fund Contribution 24,200 26,500  
Cash Incentive 242,000 213,900  
other 1,600 1,800  
Share - based expense 649,700 341,100  
LTIP expense 0 6,900  
Total remuneration 1,270,300 957,500  
B Mattison [Member] | Key management personnel of entity or parent [member]      
Disclosure of transactions between related parties [line items]      
Salary 441,400 453,600  
Pension Fund Contribution 24,200 26,500  
Cash Incentive 298,600 271,900  
other 0 2,500  
Share - based expense 969,800 545,100  
LTIP expense 0 16,400  
Total remuneration 1,734,000 1,316,000  
T Harmse [Member] | Key management personnel of entity or parent [member]      
Disclosure of transactions between related parties [line items]      
Salary 354,300 369,700  
Pension Fund Contribution 25,100 26,500  
Cash Incentive 243,500 215,300  
other 5,400 7,800  
Share - based expense 680,500 433,500  
LTIP expense 0 13,900  
Total remuneration 1,308,800 1,066,600  
A Nagaser [Member] | Key management personnel of entity or parent [member]      
Disclosure of transactions between related parties [line items]      
Salary 234,200 243,300  
Pension Fund Contribution 24,600 27,000  
Cash Incentive 160,100 131,100  
other 1,900 400  
Share - based expense 405,200 185,800  
LTIP expense 0 5,000  
Total remuneration 826,000 592,700  
S Mathews [Member] | Key management personnel of entity or parent [member]      
Disclosure of transactions between related parties [line items]      
Salary 472,100 438,200  
Pension Fund Contribution 54,500 29,500  
Cash Incentive 311,600 289,400  
other 7,300 4,900  
Share - based expense 697,000 399,200  
LTIP expense 0 10,900  
Total remuneration 1,542,500 1,172,200  
M Preece [Member] | Key management personnel of entity or parent [member]      
Disclosure of transactions between related parties [line items]      
Salary 514,300 541,700  
Pension Fund Contribution 25,100 26,500  
Cash Incentive 271,800 168,800  
other 0 400  
Share - based expense 362,700 113,000  
LTIP expense 0 0  
Total remuneration 1,173,900 850,400  
R Bardien [Member] | Key management personnel of entity or parent [member]      
Disclosure of transactions between related parties [line items]      
Salary 285,000 274,300  
Pension Fund Contribution 24,200 24,300  
Cash Incentive 116,900 150,500  
other 0 106,100  
Share - based expense 268,400 0  
LTIP expense 0 0  
Total remuneration 694,500 555,200  
Prescribed Officers [member] | Key management personnel of entity or parent [member]      
Disclosure of transactions between related parties [line items]      
Salary 4,410,700 4,549,300  
Pension Fund Contribution 489,800 482,600  
Cash Incentive 2,538,400 2,401,000  
other 361,800 578,700  
Share - based expense 6,888,400 3,449,200  
LTIP expense 0 78,600  
Total remuneration $ 14,689,100 $ 11,539,600