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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of subsidiaries [line items]      
Dividends paid to non-controlling interests $ 9.8 $ 6.4 $ 0.2
Accumulated non-controlling interest 120.8 127.2  
Abosso Goldfields Limited [member]      
Disclosure of subsidiaries [line items]      
Accumulated non-controlling interest 5.2 5.8  
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 9.2 5.8  
Accumulated non-controlling interest 115.3 119.2  
Gold Fields La Cima SA [member]      
Disclosure of subsidiaries [line items]      
Dividends paid to non-controlling interests 0.6 0.6  
Accumulated non-controlling interest $ 1.9 $ 2.4  
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%