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Accounting Policies - Narrative (Detail)
$ in Millions, R in Billions
 12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2021
ZAR (R)
Dec. 31, 2020
ZAR (R)
Dec. 31, 2019
ZAR (R)
Dec. 31, 2018
USD ($)
Disclosure of changes in accounting estimates [line items]              
Property, plant and equipment $ 5,079.1 $ 4,771.2          
Gold-in-process and stockpiles 565.8 450.2          
Carrying value write down due to loss incurred by the entity 178.8 233.3          
Provision for decommissioning, restoration and rehabilitation costs 430.9 381.5 $ 370.3        
Current provision for decommissioning, restoration and rehabilitation costs 12.0 19.6          
Non-current provision for decommissioning, restoration and rehabilitation costs 418.9 361.9          
Provisions 13.1 18.3 21.2        
Current portion of silicosis settlement costs 0.6 4.0          
Non-current portion of silicosis settlement costs 12.5 14.3          
Deferred taxation liabilities 500.9 499.9          
Deferred taxation asset 260.6 240.0          
Taxation payable 115.9 121.3 24.8       $ 0.9
Share-based payments 12.7 14.5 20.5        
Charge to income statement 28.5 51.3 9.1        
Long term incentive plan liability 56.6 67.2 11.5        
Current portion of long-term incentive plan 28.4 33.8          
Non-current portion of long-term incentive plan 28.2 33.4          
– Warrants 0.0 12.9          
Derivative financial assets 5.1 81.9          
Non-current derivative financial assets 0.0 31.4          
Derivative financial liabilities 6.8 21.8          
Derivative financial liabilities 6.8 21.8          
Non-current derivative financial liabilities 0.0 7.3          
Loss on financial instruments 96.4 240.2 $ 244.7        
Asanko redeemable preference shares $ 94.5 $ 92.6          
Dividends withholding tax percentage 20.00%            
Rand              
Disclosure of changes in accounting estimates [line items]              
Closing exchange rate 15.94 14.69 14.00 15.94 14.69 14.00  
Average exchange rate 14.79 16.38 14.46        
US Dollar              
Disclosure of changes in accounting estimates [line items]              
Closing exchange rate 0.73 0.77 0.70 0.73 0.77 0.70  
Average exchange rate 0.75 0.69 0.70        
Trade and other payables              
Disclosure of changes in accounting estimates [line items]              
Derivative financial liabilities $ 6.8 $ 29.1          
Trade and other receivables              
Disclosure of changes in accounting estimates [line items]              
– Warrants 5.1 113.3          
South deep              
Disclosure of changes in accounting estimates [line items]              
Property, plant and equipment $ 1,300.0 $ 1,400.0 $ 1,500.0 R 21.2 R 21.1 R 21.1