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Borrowings - Schedule of Borrowings (Parenthetical) (Detail)
R in Millions, $ in Millions
 1 Months Ended 12 Months Ended
May 09, 2019
USD ($)
May 27, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
AUD ($)
Dec. 31, 2019
ZAR (R)
Jul. 25, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jul. 17, 2017
USD ($)
Dec. 31, 2016
USD ($)
Disclosure of detailed information about borrowings [line items]                    
Face amount of borrowings     $ 1,200,000,000       $ 1,290,000,000      
Outstanding Notes     1,845,800,000       1,906,800,000 [1] $ 1,782,400,000 [1]    
Total proceeds from issue of notes and debentures $ 1,000,000,000                  
Average borrowings interest rate 5.625%                  
Revolving Credit Facility [member]                    
Disclosure of detailed information about borrowings [line items]                    
Face amount of borrowings           $ 1,290,000,000        
Revolving Credit Facility [member] | Gold Fields Ghana Holdings [member]                    
Disclosure of detailed information about borrowings [line items]                    
Revolving Credit Facilities           1,200,000,000        
US $1 Billion Notes [member]                    
Disclosure of detailed information about borrowings [line items]                    
Face amount of borrowings     1,000,000,000              
Unamortized transaction costs     1,300,000       3,000,000      
Profit on buy back of notes     17,700,000              
Outstanding Notes     $ 601,400,000       849,400,000 [1] 847,900,000 [1]   $ 846,400,000 [1]
Notes Maturity     7 October 2020              
US$500 million 5-year notes issue (the 5-year notes)                    
Disclosure of detailed information about borrowings [line items]                    
Face amount of borrowings     $ 500,000,000              
Proceeds From Issuance Of Bonds   $ 500,000,000                
Notes Maturity   5-year notes                
Interest Rate On Notes 5.125%                  
US$500 million 10-year notes issue (the 10-year notes)                    
Disclosure of detailed information about borrowings [line items]                    
Face amount of borrowings             500,000,000      
Proceeds From Issuance Of Bonds   $ 500,000,000                
Notes Maturity   10-year notes                
Interest Rate On Notes 6.125%                  
US$150 million revolving senior secured credit facility - old [member]                    
Disclosure of detailed information about borrowings [line items]                    
Face amount of borrowings     150,000,000              
Outstanding Notes     $ 0       0 [1] 0 [1]   82,000,000 [1]
Notes Maturity     19 September 2017              
US$150 million revolving senior secured credit facility - New [member]                    
Disclosure of detailed information about borrowings [line items]                    
Face amount of borrowings     $ 150,000,000              
Outstanding Notes     $ 83,500,000       83,500,000 [1] 83,500,000 [1]   0 [1]
Notes Maturity     19 September 2020              
US$70 million revolving credit facility [member]                    
Disclosure of detailed information about borrowings [line items]                    
Face amount of borrowings     $ 70,000,000              
Outstanding Notes     $ 0       0 [1] 0 [1]   45,000,000 [1]
Notes Maturity     6 May 2017              
US$100 million revolving senior secured credit facility [member]                    
Disclosure of detailed information about borrowings [line items]                    
Face amount of borrowings     $ 100,000,000              
Outstanding Notes     $ 0       45,000,000 [1] 45,000,000 [1]   0 [1]
Notes Maturity     30 November 2021              
A$500 million syndicated revolving credit facility [member]                    
Disclosure of detailed information about borrowings [line items]                    
Face amount of borrowings       $ 500            
Outstanding Notes     $ 168,500,000       316,500,000 [1] 231,500,000 [1]    
Notes Maturity     24 May 2021              
Facility A (US $380 Million) [member]                    
Disclosure of detailed information about borrowings [line items]                    
Face amount of borrowings     $ 380,000,000              
Outstanding Notes     $ 0       380,000,000 [1] 380,000,000 [1]    
Notes Maturity     6 June 2020              
Facility B (US $360 Million) [member]                    
Disclosure of detailed information about borrowings [line items]                    
Face amount of borrowings     $ 360,000,000              
Outstanding Notes     $ 0       92,000,000 [1] 0 [1]    
Notes Maturity     6 June 2021              
Facility C (US $550 Million) [member]                    
Disclosure of detailed information about borrowings [line items]                    
Face amount of borrowings     $ 550,000,000              
Outstanding Notes     $ 0       0 [1] 0 [1]    
Notes Maturity     6 June 2021              
US$1,200 million revolving credit facilities [member]                    
Disclosure of detailed information about borrowings [line items]                    
Face amount of borrowings     $ 1,200,000,000              
Outstanding Notes     0       0 [1] 0 [1]    
Facility A (US$600 million 3-year revolving credit facility) [member]                    
Disclosure of detailed information about borrowings [line items]                    
Face amount of borrowings     600,000,000              
Outstanding Notes     $ 0       0 [1] 0 [1]    
Notes Maturity     25 July 2022              
Facility B (US$600 million 5-year revolving credit facility) [member]                    
Disclosure of detailed information about borrowings [line items]                    
Face amount of borrowings     $ 600,000,000              
Outstanding Notes     $ 0       0 [1] 0 [1]    
Notes Maturity     25 July 2024              
R 1,500 Million Nedbank Revolving Credit Facility - old [member]                    
Disclosure of detailed information about borrowings [line items]                    
Face amount of borrowings | R         R 1,500          
Outstanding Notes     $ 0       0 [1] 79,500,000 [1]   0
Notes Maturity     7 March 2018              
R 1,500 million Nedbank revolving credit facility - new [member]                    
Disclosure of detailed information about borrowings [line items]                    
Face amount of borrowings | R         1,500          
Outstanding Notes     $ 0       0 [1] 0 [1]    
Notes Maturity     8 May 2023              
R 500 million Standard Bank revolving credit facility [member]                    
Disclosure of detailed information about borrowings [line items]                    
Face amount of borrowings | R         500          
Outstanding Notes     $ 0       13,700,000 [1] 0 [1]   0 [1]
Notes Maturity     31 March 2020              
R 500 million Absa Bank revolving credit facility [member]                    
Disclosure of detailed information about borrowings [line items]                    
Face amount of borrowings | R         R 500          
Outstanding Notes     $ 0       34,200,000 [1] 0 [1]   0 [1]
Notes Maturity     31 March 2020              
US$1,290 million term loan and revolving credit facilities [member]                    
Disclosure of detailed information about borrowings [line items]                    
Face amount of borrowings $ 1,290,000,000   $ 1,290,000,000              
Outstanding Notes     0       $ 472,000,000 [1] 380,000,000 [1]   $ 658,500,000 [1]
US $147.6 Million Notes [member]                    
Disclosure of detailed information about borrowings [line items]                    
Purchase of notes, amount     147,600,000              
Purchase price per US$1,000     $ 880              
Borrowing financed, description     the purchase of an aggregate principal amount of notes equal to US$147.6 million at the purchase price of US$880 per US$1,000 in principal amount of notes. GFA intends to hold the notes acquired until their maturity on 7 October 2020. The group recognised a profit of US$17.7 million on the buy back of the 2020 notes.              
US 250 million due on 2020 [member]                    
Disclosure of detailed information about borrowings [line items]                    
Profit on buy back of notes   $ 5,000,000                
Outstanding Notes   $ 250,000,000                
Percentage At Shares Repurchased   102.00%                
US 250 million due on 2020 [member] | Previously stated [member]                    
Disclosure of detailed information about borrowings [line items]                    
Percentage At Shares Repurchased   101.73%                
5-year notes [member]                    
Disclosure of detailed information about borrowings [line items]                    
Unamortized transaction costs     $ 3,700,000              
10-year notes [member]                    
Disclosure of detailed information about borrowings [line items]                    
Unamortized transaction costs     $ 3,900,000              
3 year revolving credit facility [member] | Revolving Credit Facility [member] | Tranches One [member]                    
Disclosure of detailed information about borrowings [line items]                    
Line of Credit Facility Remaining Borrowings           600,000,000        
5 year revolving credit facilit [member] | Revolving Credit Facility [member] | Tranches Two [member]                    
Disclosure of detailed information about borrowings [line items]                    
Line of Credit Facility Current Borrowings           $ 600,000,000        
US$70 million revolving senior secured credit facility [member]                    
Disclosure of detailed information about borrowings [line items]                    
Face amount of borrowings               $ 70,000,000    
US$108 million revolving senior secured credit facility [member]                    
Disclosure of detailed information about borrowings [line items]                    
Face amount of borrowings                 $ 108,000,000  
[1] Refer note 42.