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Accounting Policies - Additional Information (Detail)
R in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
ZAR (R)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
ZAR (R)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
ZAR (R)
Dec. 31, 2015
USD ($)
Disclosure of changes in accounting estimates [line items]              
Carrying amount of property, plant and equipment $ 4,259.2   $ 4,892.9        
Carrying value of goodwill 0.0   76.6   $ 317.8    
Impairment loss on goodwill 71.7   277.8   0.0    
Gold-in-process and stockpiles 325.0   305.4        
Provision for environmental rehabilitation costs 289.6   281.5   283.1    
Silicosis settlement costs 25.1   31.9        
Deferred taxation liability 454.9   453.9        
Deferred taxation asset 269.5   72.0        
Taxation payable 5.2   77.5   107.9   $ 59.3
Share-based payments 37.5   26.8   14.0    
Derivative financial assets 9.3   5.5        
Derivative financial liabilities 22.6   3.3        
Asanko redeemable preference shares $ 132.9   0.0        
Dividends withholding tax percentage 20.00% 20.00%          
South Deep Mine [member]              
Disclosure of changes in accounting estimates [line items]              
Impairment loss $ 481.5 R 6,470,900.0 277.8 R 3,495,000.0 0.0 R 0.0  
South Deep Mine [member] | Goodwill [member]              
Disclosure of changes in accounting estimates [line items]              
Impairment loss on goodwill 71.7 [1] 963.9 277.8 [1] 3,495.0 0.0 [1]    
South Deep Mine [member] | Other impaired assets [member]              
Disclosure of changes in accounting estimates [line items]              
Impairment loss $ 409.8 [1] R 5,507.0 $ 0.0 [1] R 0.0 $ 0.0 [1]    
Rand [member]              
Disclosure of changes in accounting estimates [line items]              
Closing exchange rate 14.63   12.58        
Average exchange rate 13.20 13.20 13.33 13.33 14.70 14.70  
US Dollars [member]              
Disclosure of changes in accounting estimates [line items]              
Closing exchange rate 0.70   0.77        
Average exchange rate 0.75 0.75 0.77 0.77 0.75 0.75  
Trade And Other Receivable [member]              
Disclosure of changes in accounting estimates [line items]              
Derivative financial assets $ 8.3   $ 25.0        
[1] For the year ended 31 December 2018, the Group recognised an impairment of R6,470.9 million (US$481.5 million) (2017: R3,495.0 billion (US$277.8 million) and 2016: Rnil (US$nil)) in respect of the South Deep cash-generating unit due to the deferral of production.