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Risk Management Activities - Schedule of Contractually Due Undiscounted Cash Flows Resulting from Maturities of All Financial Liabilities, Including Interest Payments (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
ExchangeRates
Dec. 31, 2020
USD ($)
ExchangeRates
Dec. 31, 2019
USD ($)
Disclosure of maturity analysis for derivative non-derivative financial liabilities [line items]      
Trade and other payables $ 480.5 $ 452.0  
Foreign exchange derivative contracts 6.8 29.1  
Environmental rehabilitation costs 510.5 466.6  
Lease liabilities 547.1 578.3  
South Deep dividend 5.4 6.8  
Total 2,923.4 3,433.4  
Face amount of borrowings 1,200.0    
Environmental trust funds $ 88.1 $ 79.3 $ 69.5
Rand      
Disclosure of maturity analysis for derivative non-derivative financial liabilities [line items]      
Closing exchange rate 15.94 14.69 14.00
South Africa and Ghana      
Disclosure of maturity analysis for derivative non-derivative financial liabilities [line items]      
Environmental trust funds $ 88.1 $ 79.3  
Closing foreign exchange rate | Rand      
Disclosure of maturity analysis for derivative non-derivative financial liabilities [line items]      
Closing exchange rate | ExchangeRates 15.94 14.69  
US dollar borrowings      
Disclosure of maturity analysis for derivative non-derivative financial liabilities [line items]      
Capital $ 1,083.5 $ 1,333.5  
Interest $ 289.6 $ 354.0  
US dollar borrowings | Liquidity Risk      
Disclosure of maturity analysis for derivative non-derivative financial liabilities [line items]      
Borrowings adjustment to interest rate 0.10125% 0.1439%  
Australian Dollar borrowings      
Disclosure of maturity analysis for derivative non-derivative financial liabilities [line items]      
Capital   $ 200.0  
Interest   $ 13.1  
Australian Dollar borrowings | Liquidity Risk      
Disclosure of maturity analysis for derivative non-derivative financial liabilities [line items]      
Borrowings adjustment to interest rate   0.06%  
the 5-year notes      
Disclosure of maturity analysis for derivative non-derivative financial liabilities [line items]      
Face amount of borrowings $ 500.0 $ 500.0  
Borrowings maturity, term 5 years 5 years  
the 10-year notes      
Disclosure of maturity analysis for derivative non-derivative financial liabilities [line items]      
Face amount of borrowings $ 500.0 $ 500.0  
Borrowings maturity, term 10 years 10 years  
Within one year      
Disclosure of maturity analysis for derivative non-derivative financial liabilities [line items]      
Trade and other payables $ 480.5 $ 452.0  
Foreign exchange derivative contracts 6.8 21.8  
Environmental rehabilitation costs 12.0 19.6  
Lease liabilities 82.0 88.4  
South Deep dividend 0.8 0.9  
Total 639.6 732.7  
Within one year | US dollar borrowings      
Disclosure of maturity analysis for derivative non-derivative financial liabilities [line items]      
Capital 0.0 83.5  
Interest 57.5 62.0  
Within one year | Australian Dollar borrowings      
Disclosure of maturity analysis for derivative non-derivative financial liabilities [line items]      
Capital   0.0  
Interest   4.5  
Between one and five years      
Disclosure of maturity analysis for derivative non-derivative financial liabilities [line items]      
Trade and other payables 0.0 0.0  
Foreign exchange derivative contracts 0.0 7.3  
Environmental rehabilitation costs 41.5 34.3  
Lease liabilities 216.4 228.7  
South Deep dividend 2.9 3.6  
Total 1,003.7 1,421.1  
Between one and five years | US dollar borrowings      
Disclosure of maturity analysis for derivative non-derivative financial liabilities [line items]      
Capital 583.5 750.0  
Interest 159.4 188.6  
Between one and five years | Australian Dollar borrowings      
Disclosure of maturity analysis for derivative non-derivative financial liabilities [line items]      
Capital   200.0  
Interest   8.6  
After five years      
Disclosure of maturity analysis for derivative non-derivative financial liabilities [line items]      
Trade and other payables 0.0 0.0  
Foreign exchange derivative contracts 0.0 0.0  
Environmental rehabilitation costs 457.0 412.7  
Lease liabilities 248.7 261.2  
South Deep dividend 1.7 2.3  
Total 1,280.1 1,279.6  
After five years | US dollar borrowings      
Disclosure of maturity analysis for derivative non-derivative financial liabilities [line items]      
Capital 500.0 500.0  
Interest $ 72.7 103.4  
After five years | Australian Dollar borrowings      
Disclosure of maturity analysis for derivative non-derivative financial liabilities [line items]      
Capital   0.0  
Interest   $ 0.0