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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) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Trade and other payables $ 385.3 $ 307.6
Gold and foreign exchange derivative contracts 127.6 22.6
Environmental rehabilitation costs5 436.3 399.9
Finance lease liabilities 447.4 111.5
South Deep dividend 8.5 9.6
Total 3,691.3 2,930.0
US dollar borrowings [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Capital 1,685.9 1,452.9
Interest 424.1 122.5
Australian Dollar borrowings [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Capital 168.5 316.5
Interest 7.7 33.2
Rand borrowing [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Capital   140.4
Interest   13.3
Within one year [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Trade and other payables 385.3 307.6
Gold and foreign exchange derivative contracts 127.6 22.6
Environmental rehabilitation costs5 11.9 13.0
Finance lease liabilities 63.9 11.6
South Deep dividend 1.4 1.4
Total 1,362.5 543.9
Within one year [member] | US dollar borrowings [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Capital 685.9  
Interest 81.0 69.3
Within one year [member] | Australian Dollar borrowings [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest 5.5 13.8
Within one year [member] | Rand borrowing [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Capital   92.5
Interest   12.1
Later than one and not later than five years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Environmental rehabilitation costs5 28.4 33.7
Finance lease liabilities 178.2 41.5
South Deep dividend 3.8 4.1
Total 1,090.2 1,970.4
Later than one and not later than five years [member] | US dollar borrowings [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Capital 500.0 1,452.9
Interest 209.1 53.2
Later than one and not later than five years [member] | Australian Dollar borrowings [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Capital 168.5 316.5
Interest 2.2 19.4
Later than one and not later than five years [member] | Rand borrowing [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Capital   47.9
Interest   1.2
Later than five years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Environmental rehabilitation costs5 396.0 353.2
Finance lease liabilities 205.3 58.4
South Deep dividend 3.3 4.1
Total 1,238.6 $ 415.7
Later than five years [member] | US dollar borrowings [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Capital 500.0  
Interest $ 134.0