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Related parties - Summary of Remuneration to Related Parties (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of transactions between related parties [line items]      
Salary $ 392,800,000 $ 414,700,000 $ 388,100,000
Share - based expense 37,500,000 26,800,000 $ 14,000,000
Non Executive Directors [member]      
Disclosure of transactions between related parties [line items]      
Directors fees 912,600 878,100  
Committee fees 341,300 349,800  
Total remuneration 1,253,900 1,227,900  
Key management personnel of entity or parent [member]      
Disclosure of transactions between related parties [line items]      
Salary 6,427,500 6,233,200  
Pension Fund Contribution 557,400 511,900  
Cash Incentive 3,368,700 4,280,000  
other 580,800 669,800  
Share - based expense 5,980,200 4,647,500  
LTIP expense 129,400 744,200  
Total remuneration 17,044,000 17,086,600  
C Carolus [Member] | Non Executive Directors [member]      
Disclosure of transactions between related parties [line items]      
Directors fees 231,300 216,000  
Committee fees 0 0  
Total remuneration 231,300 216,000  
R Menell [Member] | Non Executive Directors [member]      
Disclosure of transactions between related parties [line items]      
Directors fees 150,500 140,500  
Committee fees 0 0  
Total remuneration 150,500 140,500  
D Ncube [Member] | Non Executive Directors [member]      
Disclosure of transactions between related parties [line items]      
Directors fees 30,700 70,900  
Committee fees 21,300 49,100  
Total remuneration 52,000 120,000  
Y Suleman [Member] | Non Executive Directors [member]      
Disclosure of transactions between related parties [line items]      
Directors fees 75,900 70,900  
Committee fees 72,400 53,300  
Total remuneration 148,300 124,200  
P Bacchus [Member] | Non Executive Directors [member]      
Disclosure of transactions between related parties [line items]      
Directors fees 80,600 76,500  
Committee fees 61,100 53,100  
Total remuneration 141,700 129,600  
S Reid [Member] | Non Executive Directors [member]      
Disclosure of transactions between related parties [line items]      
Directors fees 80,600 76,500  
Committee fees 55,400 54,100  
Total remuneration 136,000 130,600  
T Goodlace [Member] | Non Executive Directors [member]      
Disclosure of transactions between related parties [line items]      
Directors fees 75,900 70,900  
Committee fees 38,400 40,600  
Total remuneration 114,300 111,500  
A Andani [Member] | Non Executive Directors [member]      
Disclosure of transactions between related parties [line items]      
Directors fees 80,600 76,500  
Committee fees 40,200 53,300  
Total remuneration 120,800 129,800  
C Letton [Member] | Non Executive Directors [member]      
Disclosure of transactions between related parties [line items]      
Directors fees 80,600 51,000  
Committee fees 49,800 20,000  
Total remuneration 130,400 71,000  
P Mahanyele Dabengwa [Member] | Non Executive Directors [member]      
Disclosure of transactions between related parties [line items]      
Directors fees 25,900    
Committee fees 2,700    
Total remuneration 28,600    
G Wilson [Member] | Non Executive Directors [member]      
Disclosure of transactions between related parties [line items]      
Directors fees   28,400  
Committee fees   26,300  
Total remuneration   54,700  
N Holland [Member] | Key management personnel of entity or parent [member]      
Disclosure of transactions between related parties [line items]      
Salary 1,251,600 1,186,900  
Pension Fund Contribution 26,500 26,300  
Cash Incentive 661,500 1,002,200  
other 0 0  
Share - based expense 1,654,800 1,264,300  
LTIP expense 25,500 158,800  
Total remuneration 3,619,900 3,638,500  
P Schmidt [Member] | Key management personnel of entity or parent [member]      
Disclosure of transactions between related parties [line items]      
Salary 626,600 588,600  
Pension Fund Contribution 48,200 48,200  
Cash Incentive 306,200 542,700  
other 2,100 4,000  
Share - based expense 876,200 674,800  
LTIP expense 25,300 141,800  
Total remuneration 1,884,600 2,000,100  
Executive Directors [member] | Key management personnel of entity or parent [member]      
Disclosure of transactions between related parties [line items]      
Salary 1,878,200 1,775,500  
Pension Fund Contribution 74,700 74,500  
Cash Incentive 967,700 1,544,900  
other 2,100 4,000  
Share - based expense 2,531,000 1,939,100  
LTIP expense 50,800 300,600  
Total remuneration 5,504,500 5,638,600  
L Rivera [Member] | Key management personnel of entity or parent [member]      
Disclosure of transactions between related parties [line items]      
Salary 668,800 626,300  
Pension Fund Contribution 72,800 48,400  
Cash Incentive 132,900 270,400  
other 386,800 253,300  
Share - based expense 202,600 156,800  
LTIP expense 0 0  
Total remuneration 1,463,900 1,355,200  
A Baku [Member] | Key management personnel of entity or parent [member]      
Disclosure of transactions between related parties [line items]      
Salary 808,000 784,700  
Pension Fund Contribution 185,800 180,500  
Cash Incentive 634,800 719,800  
other 68,000 150,200  
Share - based expense 990,400 784,300  
LTIP expense 25,500 146,800  
Total remuneration 2,712,500 2,766,300  
R Butcher [Member] | Key management personnel of entity or parent [member]      
Disclosure of transactions between related parties [line items]      
Salary 384,500 353,000  
Pension Fund Contribution 37,300 37,900  
Cash Incentive 192,400 278,500  
other 0 0  
Share - based expense 238,500 178,900  
LTIP expense 0 0  
Total remuneration 852,700 848,300  
N Chohan [Member] | Key management personnel of entity or parent [member]      
Disclosure of transactions between related parties [line items]      
Salary 367,200 342,800  
Pension Fund Contribution 26,500 26,300  
Cash Incentive 213,900 288,300  
other 1,800 3,300  
Share - based expense 341,100 261,400  
LTIP expense 6,900 40,300  
Total remuneration 957,400 962,400  
B Mattison [Member] | Key management personnel of entity or parent [member]      
Disclosure of transactions between related parties [line items]      
Salary 453,600 426,700  
Pension Fund Contribution 26,500 26,300  
Cash Incentive 271,900 369,900  
other 2,500 1,000  
Share - based expense 545,100 426,900  
LTIP expense 16,400 93,900  
Total remuneration 1,316,000 1,344,700  
T Harmse [Member] | Key management personnel of entity or parent [member]      
Disclosure of transactions between related parties [line items]      
Salary 369,700 344,700  
Pension Fund Contribution 26,500 26,300  
Cash Incentive 215,300 290,100  
other 7,800 6,800  
Share - based expense 433,500 342,200  
LTIP expense 13,900 78,200  
Total remuneration 1,066,700 1,088,300  
A Nagaser [Member] | Key management personnel of entity or parent [member]      
Disclosure of transactions between related parties [line items]      
Salary 243,300 228,100  
Pension Fund Contribution 27,000 25,300  
Cash Incentive 131,100 192,000  
other 400 700  
Share - based expense 185,800 143,700  
LTIP expense 5,000 24,900  
Total remuneration 592,600 614,700  
S Mathews [Member] | Key management personnel of entity or parent [member]      
Disclosure of transactions between related parties [line items]      
Salary 438,200 397,500  
Pension Fund Contribution 29,500 21,200  
Cash Incentive 289,400 326,100  
other 4,900 10,000  
Share - based expense 399,200 316,400  
LTIP expense 10,900 59,500  
Total remuneration 1,172,100 1,130,700  
M Preece [Member] | Key management personnel of entity or parent [member]      
Disclosure of transactions between related parties [line items]      
Salary 541,700 338,200  
Pension Fund Contribution 26,500 16,600  
Cash Incentive 168,800 0  
other 400 0  
Share - based expense 113,000 63,500  
LTIP expense 0 0  
Total remuneration 850,400 418,300  
R Bardien [Member] | Key management personnel of entity or parent [member]      
Disclosure of transactions between related parties [line items]      
Salary 274,300    
Pension Fund Contribution 24,300    
Cash Incentive 150,500    
other 106,100    
Share - based expense 0    
LTIP expense 0    
Total remuneration 555,200    
Prescribed Officers [member] | Key management personnel of entity or parent [member]      
Disclosure of transactions between related parties [line items]      
Salary 4,549,300 4,457,700  
Pension Fund Contribution 482,700 437,400  
Cash Incentive 2,401,000 2,735,100  
other 578,700 665,800  
Share - based expense 3,449,200 2,708,400  
LTIP expense 78,600 443,600  
Total remuneration $ 11,539,500 11,448,000  
L Samuel [Member] | Key management personnel of entity or parent [member]      
Disclosure of transactions between related parties [line items]      
Salary   384,300  
Pension Fund Contribution   17,500  
Cash Incentive   0  
other   198,900  
Share - based expense   0  
LTIP expense   0  
Total remuneration   600,700  
R Weston [Member] | Key management personnel of entity or parent [member]      
Disclosure of transactions between related parties [line items]      
Salary   102,000  
Pension Fund Contribution   4,500  
Cash Incentive   0  
other   7,600  
Share - based expense   34,400  
LTIP expense   0  
Total remuneration   148,500  
N Muller [Member] | Key management personnel of entity or parent [member]      
Disclosure of transactions between related parties [line items]      
Salary   129,400  
Pension Fund Contribution   6,600  
Cash Incentive   0  
other   34,000  
Share - based expense   0  
LTIP expense   0  
Total remuneration   $ 170,000