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Major Group Investments - Direct and Indirect - Schedule of Major Group Investments - Direct and Indirect (Parenthetical) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
 [1]
Jan. 01, 2018
Disclosure of subsidiaries [line items]        
Dividends paid to non-controlling interests $ 2.2 $ 9.8 [1] $ 6.4  
Accumulated non-controlling interest 131.7 120.8 [1]   $ 127.2
Abosso Goldfields Limited [member]        
Disclosure of subsidiaries [line items]        
Accumulated non-controlling interest 7.9 5.2    
Dividends paid to non-controlling interests 0.0 0.0    
Gold Fields Ghana Limited [member]        
Disclosure of subsidiaries [line items]        
Dividends paid to non-controlling interests 2.0 9.2    
Accumulated non-controlling interest 125.5 115.3    
Gold Fields La Cima SA [member]        
Disclosure of subsidiaries [line items]        
Dividends paid to non-controlling interests 0.2 0.6    
Accumulated non-controlling interest $ 2.1 $ 1.9    
Newshelf 899 (Pty) Ltd [member]        
Disclosure of subsidiaries [line items]        
Phase-in participation term 20 years      
BEE partners' stake 10.00%      
Newshelf ownership percentage 90.00%      
[1] Refer note 42.