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Estimated Fair Values of Financial Instruments (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Financial assets        
Cash and cash equivalents $ 325.0 $ 655.6 $ 744.0 $ 809.5
Receivables 272.6 522.7    
Non-current investments 268.9 458.0    
Financial liabilities        
Long-term loans 1,938.6 2,321.2    
Accounts payable and provisions 445.0 734.0    
Interest payable 12.4 11.0    
Short-term loans and current portion of long-term loans 121.5 [1] 40.0 [1]    
Other non-current liabilities 10.9 13.9    
Carrying (Reported) Amount, Fair Value Disclosure
        
Financial assets        
Cash and cash equivalents 325.0 655.6    
Receivables 146.7 314.5    
Non-current investments 268.9 [2] 458.0 [2]    
Financial liabilities        
Long-term loans 1,938.6 2,321.2    
Accounts payable and provisions 402.1 660.2    
Interest payable 12.4 11.0    
Short-term loans and current portion of long-term loans 121.5 40.0    
Other non-current liabilities 10.9 13.9    
Fair value
        
Financial assets        
Cash and cash equivalents 325.0 655.6    
Receivables 146.7 314.5    
Non-current investments 269.7 [2] 464.6 [2]    
Financial liabilities        
Long-term loans 1,794.4 2,322.4    
Accounts payable and provisions 402.1 660.2    
Interest payable 12.4 11.0    
Short-term loans and current portion of long-term loans 121.5 40.0    
Other non-current liabilities $ 10.9 $ 13.9    
[1] At December 31, 2012, the maturity of the loans was updated to reflect post year-end refinancing terms.
[2] Fair value determined by using cost for Rand Refinery Limited and Far South East due to a market value not being readily available.