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Accounting Policies - Additional Information (Detail)
$ in Millions, R in Billions
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2020
ZAR (R)
Dec. 31, 2019
ZAR (R)
Dec. 31, 2018
ZAR (R)
Dec. 31, 2017
USD ($)
Disclosure of changes in accounting estimates [line items]              
Carrying amount of property, plant and equipment $ 4,771.2 $ 4,657.1          
Impairment loss 11.7            
Impairment loss on goodwill 0.0 0.0 $ 71.7        
Gold-in-process and stockpiles 450.2 375.1          
Provision for environmental rehabilitation costs 381.5 370.3 289.6        
Current provision for environmental rehabilitation costs 19.6 0.0          
Non-current portion of environmental rehabilitation costs 361.9 370.3          
Charge to income statement 51.3 9.1 1.1        
Long-term incentive plan provision 67.2 11.5          
Current portion of long-term incentive plan 33.8 0.0          
Non-current portion of long-term incentive plan 33.4 11.5          
Silicosis settlement costs 18.3 21.2          
Silicosis settlement costs current 4.0 4.6          
Silicosis settlement costs noncurrent 14.3 16.6          
Deferred taxation liability 499.9 433.6          
Deferred taxation asset 240.0 265.5          
Taxation payable 121.3 24.8 0.9       $ 46.7
Share-based payments 14.5 20.5 37.5        
Derivative financial assets 12.9 11.7          
Derivative financial liabilities 21.8 127.6          
Asanko redeemable preference shares $ 92.6 95.5          
Dividends withholding tax percentage 20.00%            
Equity accounted investees $ 233.3 172.0          
Derivative financial assets 81.9 1.1          
Non-current derivative financial assets 31.4 0.0          
Derivative financial liabilities 21.8 127.6          
Non-current derivative financial liabilities 7.3 0.0          
South Deep Mine [member]              
Disclosure of changes in accounting estimates [line items]              
Goodwill carrying value 1,400.0 1,500.0 1,400.0 R 21.1 R 21.1 R 21.2  
Impairment loss [1] 0.0 0.0 409.8        
South Deep Mine [member] | Goodwill [member]              
Disclosure of changes in accounting estimates [line items]              
Impairment loss on goodwill [1] $ 0.0 $ 0.0 71.7        
South Deep Mine [member] | Other impaired assets [member]              
Disclosure of changes in accounting estimates [line items]              
Impairment loss     $ 481.5        
Rand [member]              
Disclosure of changes in accounting estimates [line items]              
Closing exchange rate 14.69 14.00 14.63 14.69 14.00 14.63  
Average exchange rate 16.38 14.46 13.20        
US Dollars [member]              
Disclosure of changes in accounting estimates [line items]              
Closing exchange rate 0.77 0.70 0.70 0.77 0.70 0.70  
Average exchange rate 0.69 0.70 0.75        
Trade And Other Payable [Member]              
Disclosure of changes in accounting estimates [line items]              
Derivative financial liabilities $ 29.1 $ 127.6          
Derivative financial assets 81.9 1.1          
Non-current derivative financial assets 31.4 0.0          
Derivative financial liabilities 21.8 127.6          
Non-current derivative financial liabilities 7.3 0.0          
Trade And Other Receivable [member]              
Disclosure of changes in accounting estimates [line items]              
Derivative financial assets $ 113.3 $ 1.1          
[1] For the year ended 31 December 2018, the Group recognised an impairment of R6,470.9 million (US$481.5 million) in respect of the South Deep cash-generating unit due to the deferral of production. R963.9 million (US$71.7 million) of the total impairment was firstly allocated against goodwill and the remainder of R5,507.0 million (US$409.8 million) 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). No impairment or reversal of impairment was recognised in 2020 or 2019.