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Financial Instruments - Summary of Financial Instruments (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
 [2]
Financial assets [Abstract]        
Environmental trust fund $ 55.5 $ 44.5 [1] $ 35.0  
Trade and other receivables 201.9 170.2 [1]    
Cash and cash equivalents 479.0 526.7 [1],[2] $ 440.0 [2] $ 458.0
Fair value through profit or loss        
Trade receivables from provisional copper concentrate sales 21.2 10.6    
Available for sale [Abstract]        
Investments 99.1 13.8    
Copper derivative contracts 3.3 0.0 [1]    
Financial liabilities [Abstract]        
Borrowings 1,781.5 1,692.9    
Trade and other payables 451.0 459.3    
South Deep dividend 6.4 6.4    
Trades and Other Payables [Member]        
Financial assets [Abstract]        
Trade and other receivables 45.3 57.9    
Warrant [Member]        
Available for sale [Abstract]        
Derivative Instruments 5.5 5.9    
Gold and Oil Derivative Contracts [Member]        
Available for sale [Abstract]        
Derivative Instruments $ 25.0 $ 0.0    
[1] As Restated - Refer note 40 for further details.
[2] The restatement is as a result of the discontinued operations.