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Accounting Policies - Additional Information (Detail)
R in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
R / $
$ / $
Dec. 31, 2019
ZAR (R)
R / $
$ / $
Dec. 31, 2018
USD ($)
R / $
$ / $
Dec. 31, 2018
ZAR (R)
R / $
$ / $
Dec. 31, 2017
USD ($)
R / $
$ / $
Dec. 31, 2017
ZAR (R)
R / $
$ / $
Dec. 31, 2019
ZAR (R)
R / $
$ / $
Dec. 31, 2018
ZAR (R)
R / $
$ / $
Jan. 01, 2018
USD ($)
Dec. 31, 2016
USD ($)
 [1]
Disclosure of changes in accounting estimates [line items]                    
Carrying amount of property, plant and equipment $ 4,657.1   $ 4,259.2 [1]           $ 4,892.9  
Goodwill carrying value 0.0   0.0 [1]   $ 76.6       76.6  
Impairment loss on goodwill 0.0   71.7   277.8          
Gold-in-process and stockpiles 375.1   325.0              
Provision for environmental rehabilitation costs 370.3   289.6   281.5          
Charge to income statement 9.1   1.1   5.0          
Non-current portion of long-term incentive plan 11.5   2.1              
Silicosis settlement costs 21.2   25.1              
Silicosis settlement costs current 4.6   0.0 [1]           0.0  
Silicosis settlement costs noncurrent 16.6   25.1              
Deferred taxation liability 433.6   454.9 [1]           453.9  
Deferred taxation asset 265.5   269.5 [1]           72.0  
Taxation payable 24.8 [1]   0.9 [1]   46.7 [1]       46.7 $ 87.0
Share-based payments 20.5   37.5   26.8          
Derivative financial assets 11.7   9.3              
Asanko redeemable preference shares $ 95.5   132.9              
Dividends withholding tax percentage 20.00% 20.00%                
Equity accounted investees $ 172.0   225.1 [1]           $ 171.3  
Asanko Gold [member]                    
Disclosure of changes in accounting estimates [line items]                    
Life of mine 10 years 10 years                
South Deep Mine [member]                    
Disclosure of changes in accounting estimates [line items]                    
Goodwill carrying value $ 1,500.0   1,400.0       R 21,100.0 R 21,200.0    
Impairment loss 0.0 R 0.0 481.5 R 6,470.9 277.8 R 3,495,000.0        
South Deep Mine [member] | Goodwill [member]                    
Disclosure of changes in accounting estimates [line items]                    
Impairment loss on goodwill 0.0 [2] 0.0 71.7 963.9 277.8 [2] 3,495,000.0        
South Deep Mine [member] | Other impaired assets [member]                    
Disclosure of changes in accounting estimates [line items]                    
Impairment loss $ 0.0 R 0.0 $ 409.8 [2] R 5,507.0 $ 0.0 R 0.0        
Rand [member]                    
Disclosure of changes in accounting estimates [line items]                    
Closing exchange rate | R / $ 14.00   14.63   12.58   14.00 14.63    
Average exchange rate | R / $ 14.46 14.46 13.20 13.20 13.33 13.33        
US Dollars [member]                    
Disclosure of changes in accounting estimates [line items]                    
Closing exchange rate | $ / $ 0.70   0.70   0.77   0.70 0.70    
Average exchange rate | $ / $ 0.70 0.70 0.75 0.75 0.77 0.77        
Trade And Other Payable [Member]                    
Disclosure of changes in accounting estimates [line items]                    
Derivative financial liabilities $ 127.6   $ 22.6              
Trade And Other Receivable [member]                    
Disclosure of changes in accounting estimates [line items]                    
Derivative financial assets $ 1.1   $ 8.3              
[1] Refer note 42.
[2] For the year ended 31 December 2019, the Group recognised an impairment of Rnil (US$nil) (2018: R6,470.9 million (US$481.5 million) and 2017: R3,495.0 billion (US$277.8 million)) in respect of the South Deep cash-generating unit due to the deferral of production. Rnil (US$nil) (2018: R963.9 million (US$71.7 million) and 2017: R3,495.0 billion (US$277.8 million)) of the total impairment was firstly allocated against goodwill and the remainder of Rnil (US$nil) (2018: R5,507.0 million (US$409.8 million) and 2017: Rnil (US$nil)) against other assets. The recoverable amount was based on its FVLCOD calculated using a combination of the market and the income approach (level 3 of the fair value hierarchy).