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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, $ in Millions
Dec. 31, 2020
USD ($)
Dec. 31, 2020
AUD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
AUD ($)
Dec. 31, 2018
USD ($)
Disclosure of maturity analysis for derivative non-derivative financial liabilities [line items]          
Trade and other payables $ 452.0   $ 385.3    
Oil and copper derivative contracts 29.1        
Gold and foreign exchange derivative contracts     127.6    
Environmental rehabilitation costs5 466.6   436.3    
Finance lease liabilities 429.0   332.9   $ 88.6
South Deep dividend 6.8   8.5    
Total 3,433.4   3,691.3    
US dollar borrowings [member]          
Disclosure of maturity analysis for derivative non-derivative financial liabilities [line items]          
Capital 1,333.5   1,685.9    
Interest 354.0   424.1    
Australian Dollar borrowings [member]          
Disclosure of maturity analysis for derivative non-derivative financial liabilities [line items]          
Capital   $ 200.0   $ 168.5  
Interest   13.1   7.7  
Within one year [member]          
Disclosure of maturity analysis for derivative non-derivative financial liabilities [line items]          
Trade and other payables 452.0   385.3    
Oil and copper derivative contracts 21.8        
Gold and foreign exchange derivative contracts     127.6    
Environmental rehabilitation costs5 19.6   11.9    
Finance lease liabilities 88.4   63.9    
South Deep dividend 0.9   1.4    
Total 732.7   1,362.5    
Within one year [member] | US dollar borrowings [member]          
Disclosure of maturity analysis for derivative non-derivative financial liabilities [line items]          
Capital 83.5   685.9    
Interest 62.0   81.0    
Within one year [member] | Australian Dollar borrowings [member]          
Disclosure of maturity analysis for derivative non-derivative financial liabilities [line items]          
Interest   4.5   5.5  
Later than one and not later than five years [member]          
Disclosure of maturity analysis for derivative non-derivative financial liabilities [line items]          
Oil and copper derivative contracts 7.3        
Environmental rehabilitation costs5 34.3   28.4    
Finance lease liabilities 228.7   178.2    
South Deep dividend 3.6   3.8    
Total 1,421.1   1,090.2    
Later than one and not later than five years [member] | US dollar borrowings [member]          
Disclosure of maturity analysis for derivative non-derivative financial liabilities [line items]          
Capital 750.0   500.0    
Interest 188.6   209.1    
Later than one and not later than five years [member] | Australian Dollar borrowings [member]          
Disclosure of maturity analysis for derivative non-derivative financial liabilities [line items]          
Capital   200.0   168.5  
Interest   $ 8.6   $ 2.2  
Later than five years [member]          
Disclosure of maturity analysis for derivative non-derivative financial liabilities [line items]          
Environmental rehabilitation costs5 412.7   396.0    
Finance lease liabilities 261.2   205.3    
South Deep dividend 2.3   3.3    
Total 1,279.6   1,238.6    
Later than five years [member] | US dollar borrowings [member]          
Disclosure of maturity analysis for derivative non-derivative financial liabilities [line items]          
Capital 500.0   500.0    
Interest $ 103.4   $ 134.0