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Mining and Income Taxation - Summary of Domestic and Foreign Current Tax Rates (Detail)
R in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2023
Dec. 31, 2022
USD ($)
Dec. 31, 2022
ZAR (R)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Disclosure of Domestic and Foreign Current Tax Rate [Line Items]              
– Mining and income taxation       $ 442.1   $ 424.9 $ 432.5
Deferred tax expense (income) relating to tax rate changes or imposition of new taxes       $ 4.6 R 76.2    
Mining tax              
Disclosure of Domestic and Foreign Current Tax Rate [Line Items]              
Effective mining tax rate 28.00% 29.00%       29.00% 29.00%
South African taxation | Non-mining tax              
Disclosure of Domestic and Foreign Current Tax Rate [Line Items]              
Current tax rates       28.00% 28.00% 28.00% 28.00%
South African taxation | Non-mining tax | Forecast              
Disclosure of Domestic and Foreign Current Tax Rate [Line Items]              
Current tax rates     27.00%        
South African taxation | Company tax rate              
Disclosure of Domestic and Foreign Current Tax Rate [Line Items]              
Current tax rates       28.00% 28.00% 28.00% 28.00%
Australia | Non-mining tax              
Disclosure of Domestic and Foreign Current Tax Rate [Line Items]              
Current tax rates       30.00% 30.00% 30.00% 30.00%
Ghana | Non-mining tax              
Disclosure of Domestic and Foreign Current Tax Rate [Line Items]              
Current tax rates       32.50% 32.50% 32.50% 32.50%
Peru | Non-mining tax              
Disclosure of Domestic and Foreign Current Tax Rate [Line Items]              
Current tax rates       29.50% 29.50% 29.50% 29.50%