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Non Cash-Items (Detail) (USD $)
In Millions, unless otherwise specified
 1 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Other Significant Noncash Transactions [Line Items]        
Marked to market (loss)/gain of listed investments   $ (1.3) [1] $ 18.7 [1] $ (26.4) [1]
Sibanye Gold spin-off (refer note 9.1), excluding cash transferred   927.3    
Shares issued on acquisition of Yilgarn South assets (refer note 3(f)) $ 127.3 $ 127.3    
[1] Includes deferred tax of $1.7 million (2012: $1.0 million and 2011: $2.8 million).