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Major Group Investments - Direct and Indirect - Schedule of Major Group Investments - Direct and Indirect (Parenthetical) (Detail)
R in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2020
ZAR (R)
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
Disclosure of subsidiaries [line items]        
Dividends paid to non-controlling interests | $ $ 7.6   $ 2.2 $ 9.8
Accumulated non-controlling interest | $ 163.7   131.7  
Abosso Goldfields Limited [member]        
Disclosure of subsidiaries [line items]        
Accumulated non-controlling interest | $ 12.0   7.9  
Dividends paid to non-controlling interests | $ $ 4.5   $ 0.0  
Abosso Goldfields Limited [member] | Class a shares [member]        
Disclosure of subsidiaries [line items]        
Shares held 49,734,000   49,734,000  
Abosso Goldfields Limited [member] | Class B Shares [member]        
Disclosure of subsidiaries [line items]        
Shares held 4,266,000   4,266,000  
Gold Fields Ghana Limited [member]        
Disclosure of subsidiaries [line items]        
Dividends paid to non-controlling interests | $ $ 5.1   $ 2.0  
Accumulated non-controlling interest | $ $ 142.7   $ 125.5  
Shares held 900   900  
Gold Fields La Cima SA [member]        
Disclosure of subsidiaries [line items]        
Dividends paid to non-controlling interests | $ $ 0.5   $ 0.2  
Accumulated non-controlling interest | $ $ 1.9   $ 2.1  
Shares held 1,426,050,205   1,426,050,205  
Newshelf 899 (Pty) Ltd [member] | Class a shares [member]        
Disclosure of subsidiaries [line items]        
Newshelf ownership percentage 90.00% 90.00%    
Shares held 90,000,000   90,000,000  
Newshelf 899 (Pty) Ltd [member] | Class B Shares [member]        
Disclosure of subsidiaries [line items]        
BEE partners' stake 10.00% 10.00%    
Shares held 10,000,000   10,000,000  
Newshelf 899 (Pty) Ltd [member] | Class B Shares [member] | Not Later Than Ten Years [Member]        
Disclosure of subsidiaries [line items]        
Phase-in participation term 10 years 10 years    
cumulative preferential dividend | R   R 20.0    
Phase in participation term expiration date 2020-12 2020-12    
Suspension Lifted Period To Participate In The Profits Phase In Basis Term 10 years 10 years    
Description of shares lifted from suspension over the period after 10 years, in respect of one-third of the “B” shares after 10 years, in respect of one-third of the “B” shares    
Newshelf 899 (Pty) Ltd [member] | Class B Shares [member] | Later Than Ten Years and Not Later Fifeteen Years [Member]        
Disclosure of subsidiaries [line items]        
Phase-in participation term 5 years 5 years    
cumulative preferential dividend | R   R 13.3    
Suspension Lifted Period To Participate In The Profits Phase In Basis Term 15 years 15 years    
Description of shares lifted from suspension over the period after 15 years, in respect of another one-third of the “B” shares after 15 years, in respect of another one-third of the “B” shares    
Newshelf 899 (Pty) Ltd [member] | Class B Shares [member] | Later Than Fifeteen Years and Not Later Twenty Years [Member]        
Disclosure of subsidiaries [line items]        
Phase-in participation term 5 years 5 years    
cumulative preferential dividend | R   R 6.7    
Suspension Lifted Period To Participate In The Profits Phase In Basis Term 20 years 20 years    
Description of shares lifted from suspension over the period after 20 years, in respect of the remaining one-third of the “B” shares after 20 years, in respect of the remaining one-third of the “B” shares    
Gold Fields Operations Limited [member]        
Disclosure of subsidiaries [line items]        
Shares held 156,279,947   156,279,947  
Gold Fields Operations Limited [member] | Class a shares [member]        
Disclosure of subsidiaries [line items]        
Shares held 90,000,000      
South Deep BEE [Member]        
Disclosure of subsidiaries [line items]        
Preferential Dividend Going To Cease Period 20 years 20 years    
South Deep BEE [Member] | Class B Shares [member]        
Disclosure of subsidiaries [line items]        
Shares held 10,000,000      
Ownership Retention Term 30 years 30 years