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Borrowings - Schedule of Borrowings (Parenthetical) (Detail)
R in Millions, $ in Millions, $ in Millions
 1 Months Ended 12 Months Ended
May 09, 2019
USD ($)
May 27, 2019
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2020
ZAR (R)
Dec. 31, 2020
AUD ($)
Nov. 23, 2020
AUD ($)
Nov. 19, 2020
AUD ($)
Jul. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jul. 25, 2019
USD ($)
Jun. 30, 2019
USD ($)
May 24, 2019
Dec. 31, 2018
USD ($)
Disclosure of detailed information about borrowings [line items]                            
Face amount of borrowings     $ 1,200.0                      
Term loan and revolving credit facility                     $ 1,290.0      
Outstanding Notes     1,526.9             $ 1,845.8        
Total proceeds from issue of notes and debentures $ 1,000.0                          
Average borrowings interest rate 5.625%                          
Revolving Credit Facility [member]                            
Disclosure of detailed information about borrowings [line items]                            
Face amount of borrowings                     1,290.0      
Term loan and revolving credit facility                     1,200.0      
Revolving Credit Facility [member] | Gold Fields Ghana Holdings [member]                            
Disclosure of detailed information about borrowings [line items]                            
Revolving Credit Facilities                     1,200.0      
US $1 Billion Notes [member]                            
Disclosure of detailed information about borrowings [line items]                            
Face amount of borrowings     1,000.0             1,000.0        
Purchase of notes, amount     $ 147.6                      
Purchase price per US$1,000                   880.0        
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 held the notes until their maturity on 7 October 2020. The group recognised a profit of US$17.7 million in 2016 on the buy back of the 2020 notes.                      
Profit (loss) on buy back of notes   $ (5.0)   $ 17.7                    
Outstanding Notes   $ 250.0 $ 0.0             601.4        
Percentage At Shares Repurchased   102.00%                     101.73%  
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     $ 500.0                      
Unamortized transaction costs     3.0             3.7        
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     500.0                      
Unamortized transaction costs     3.6             3.9        
Interest Rate On Notes 6.125%                          
US$150 million revolving senior secured credit facility - New [member]                            
Disclosure of detailed information about borrowings [line items]                            
Face amount of borrowings     150.0                      
US$100 million revolving credit facility [member]                            
Disclosure of detailed information about borrowings [line items]                            
Face amount of borrowings     100.0                      
Outstanding Notes     $ 0.0             0.0        
Notes Maturity     30 November 2021                      
Facility A (US $380 Million) [member]                            
Disclosure of detailed information about borrowings [line items]                            
Face amount of borrowings     $ 380.0                      
Outstanding Notes     $ 0.0             0.0        
Notes Maturity     6 June 2020                      
Facility B (US $360 Million) [member]                            
Disclosure of detailed information about borrowings [line items]                            
Face amount of borrowings     $ 360.0                      
Outstanding Notes     $ 0.0             0.0        
Notes Maturity     6 June 2021                      
Facility C (US $550 Million) [member]                            
Disclosure of detailed information about borrowings [line items]                            
Face amount of borrowings     $ 550.0                      
Outstanding Notes     $ 0.0             0.0        
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                   1,200.0        
Outstanding Notes     $ 250.0             0.0        
US$1,200 million revolving credit facilities [member] | Revolving Credit Facility [member]                            
Disclosure of detailed information about borrowings [line items]                            
Face amount of borrowings                 $ 870.0          
Facility A (US$600 million 3-year revolving credit facility) [member]                            
Disclosure of detailed information about borrowings [line items]                            
Face amount of borrowings     600.0                      
Outstanding Notes     $ 250.0             0.0        
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     $ 600.0                      
Outstanding Notes     $ 0.0             0.0        
Notes Maturity     25 July 2024                      
R 1,500 Million Nedbank Revolving Credit Facility [member]                            
Disclosure of detailed information about borrowings [line items]                            
Face amount of borrowings | R         R 1,500                  
Outstanding Notes     $ 0.0             0.0        
Notes Maturity     8 May 2023                      
R 500 million Absa Bank revolving credit facility [member]                            
Disclosure of detailed information about borrowings [line items]                            
Face amount of borrowings | R         500                  
Outstanding Notes     $ 0.0             0.0        
Notes Maturity     15 April 2023                      
US$1,290 million term loan and revolving credit facilities [member]                            
Disclosure of detailed information about borrowings [line items]                            
Face amount of borrowings $ 1,290.0                     $ 1,290.0    
Outstanding Notes     $ 0.0             0.0       $ 472.0
3 year revolving credit facility [member] | Gold Fields Ghana Holdings [member] | Tranches One [member]                            
Disclosure of detailed information about borrowings [line items]                            
Line of Credit Facility Remaining Borrowings                     600.0      
5 year revolving credit facilit [member] | Gold Fields Ghana Holdings [member] | Tranches Two [member]                            
Disclosure of detailed information about borrowings [line items]                            
Line of Credit Facility Current Borrowings                     $ 600.0      
Facility A: US$435 million revolving credit facility [member] | Bottom of range [member]                            
Disclosure of detailed information about borrowings [line items]                            
Notes Maturity     26 July 2022                      
Facility A: US$435 million revolving credit facility [member] | Top of range [member]                            
Disclosure of detailed information about borrowings [line items]                            
Notes Maturity     25 July 2023                      
Facility B: US$435 million revolving credit facility [member] | Amendment One [Member] | Bottom of range [member]                            
Disclosure of detailed information about borrowings [line items]                            
Notes Maturity     26 July 2024                      
Facility B: US$435 million revolving credit facility [member] | Amendment One [Member] | Top of range [member]                            
Disclosure of detailed information about borrowings [line items]                            
Notes Maturity     25 July 2025                      
Facility A: US$600 million revolving credit facility [member]                            
Disclosure of detailed information about borrowings [line items]                            
Notes Maturity     25 July 2022                      
Facility B: US$600 million revolving credit facility [member]                            
Disclosure of detailed information about borrowings [line items]                            
Notes Maturity     25 July 2024                      
AU $ 500 Million Syndicated Revolving Credit Facility Old [Member]                            
Disclosure of detailed information about borrowings [line items]                            
Face amount of borrowings           $ 500                
Outstanding Notes     $ 0.0             168.5        
Notes Maturity     24 May 2021                      
AU $ 500 Million Syndicated Revolving Credit Facility Old [Member] | Revolving Credit Facility [member]                            
Disclosure of detailed information about borrowings [line items]                            
Face amount of borrowings               $ 500            
AU $ 500 Million Syndicated Revolving Credit Facility New [Member]                            
Disclosure of detailed information about borrowings [line items]                            
Face amount of borrowings           $ 500                
Outstanding Notes     $ 200.0             0.0        
Notes Maturity     19 November 2023                      
AU $ 500 Million Syndicated Revolving Credit Facility New [Member] | Revolving Credit Facility [member]                            
Disclosure of detailed information about borrowings [line items]                            
Face amount of borrowings             $ 500              
R 500 Million Rand Merchant Bank Revolving Credit Facility [Member]                            
Disclosure of detailed information about borrowings [line items]                            
Face amount of borrowings | R         R 500                  
Outstanding Notes     $ 0.0             $ 0.0        
Notes Maturity     15 April 2023