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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Trade and other payables $ 393.1 $ 451.0  
Gold, copper and foreign exchange derivative contracts 22.6 3.3 $ 0.0
Environmental rehabilitation costs5 399.9 381.0  
Finance lease liabilities 111.5    
South Deep dividend 9.6 12.7  
Total 3,131.9 2,817.3  
US dollar borrowings [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Capital 1,563.9 1,360.9  
Interest 134.6 149.1  
Australian Dollar borrowings [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Capital 316.5 231.5  
Interest 33.2 23.4  
Rand borrowing [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Capital 134.2 193.6  
Interest 12.8 10.8  
Within one year [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Trade and other payables 393.1 451.0  
Gold, copper and foreign exchange derivative contracts 22.6 3.3  
Environmental rehabilitation costs5 13.0 6.5  
Finance lease liabilities 11.6    
South Deep dividend 1.4 1.6  
Total 627.6 737.6  
Within one year [member] | US dollar borrowings [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Capital 0.0 0.0  
Interest 74.2 61.3  
Within one year [member] | Australian Dollar borrowings [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Capital 0.0 0.0  
Interest 13.8 9.5  
Within one year [member] | Rand borrowing [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Capital 86.3 193.6  
Interest 11.6 10.8  
Later than one and not later than five years [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Trade and other payables 0.0 0.0  
Gold, copper and foreign exchange derivative contracts 0.0 0.0  
Environmental rehabilitation costs5 33.7 24.8  
Finance lease liabilities 41.5    
South Deep dividend 4.1 5.3  
Total 2,088.6 1,724.2  
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 1,563.9 1,360.9  
Interest 60.4 87.8  
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 316.5 231.5  
Interest 19.4 13.9  
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 0.0  
Interest 1.2 0.0  
Later than five years [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Trade and other payables 0.0 0.0  
Gold, copper and foreign exchange derivative contracts 0.0 0.0  
Environmental rehabilitation costs5 353.2 349.7  
Finance lease liabilities 58.4    
South Deep dividend 4.1 5.8  
Total 415.7 355.5  
Later than five years [member] | US dollar borrowings [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Capital 0.0 0.0  
Interest 0.0 0.0  
Later than five years [member] | Australian Dollar borrowings [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Capital 0.0 0.0  
Interest 0.0 0.0  
Later than five years [member] | Rand borrowing [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [line items]      
Capital 0.0 0.0  
Interest $ 0.0 $ 0.0