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Fair Value of Assets and Liabilities - Summary of Estimated Fair Values of the Group's Financial Assets and Liabilities (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
 [2]
Disclosure of detailed information about financial instruments [line items]        
Cash and cash equivalents $ 479.0 $ 526.7 [1],[2] $ 440.0 [2] $ 458.0
Trade and other receivables 201.9 170.2 [1]    
Gold and oil derivative contracts 25.0 0.0    
Environmental trust fund 55.5 44.5 [1] $ 35.0  
Investments 104.6 19.7 [1]    
Trade and other payables 548.5 543.3 [1]    
Borrowings 1,587.9 1,504.9 [1]    
Current portion of borrowings 193.6 188.0 [1]    
Copper derivative contracts 3.3 0.0 [1]    
South Deep dividend 6.4 6.4    
Not measured at fair value in statement of financial position but for which fair value is disclosed [member]        
Disclosure of detailed information about financial instruments [line items]        
Cash and cash equivalents 479.0 526.7    
Trade and other receivables 66.5 68.5    
Gold and oil derivative contracts 25.0 0.0    
Environmental trust fund 55.5 44.5    
Investments 104.6 19.7    
Trade and other payables 451.0 459.3    
Borrowings 1,611.5 1,496.7    
Current portion of borrowings 193.6 188.0    
Copper derivative contracts 3.3 0.0    
South Deep dividend 6.4 6.4    
Carrying amount [member]        
Disclosure of detailed information about financial instruments [line items]        
Cash and cash equivalents 479.0 526.7    
Trade and other receivables 66.5 68.5    
Gold and oil derivative contracts 25.0 0.0    
Environmental trust fund 55.5 44.5    
Investments 104.6 19.7    
Trade and other payables 451.0 459.3    
Borrowings 1,587.9 1,504.9    
Current portion of borrowings 193.6 188.0    
Copper derivative contracts 3.3 0.0    
South Deep dividend $ 6.4 $ 6.4    
[1] As Restated - Refer note 40 for further details.
[2] The restatement is as a result of the discontinued operations.