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Non Cash-Items (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Other Significant Noncash Transactions [Line Items]      
Marked to market gain/(loss) of listed investments [1] $ 0.4 $ 6.9 $ (1.3)
Yanfolila      
Other Significant Noncash Transactions [Line Items]      
Disposal group (refer note 3(c))   (16.0)  
Yilgarn South      
Other Significant Noncash Transactions [Line Items]      
Shares issued on acquisition (refer note 3(b))     127.3
Sibanye Gold Limited [Member]      
Other Significant Noncash Transactions [Line Items]      
Spin-off (refer note 9.1), excluding cash transferred     $ 927.3
Hummingbird | Discontinued Operations, Disposed of by Sale | Yanfolila      
Other Significant Noncash Transactions [Line Items]      
Disposal value for acquisition   5.1  
Acquisition of investment (refer note 3(c))   $ 21.1  
[1] Includes deferred tax of $nil (2014: $nil and 2013: $1.7 million).