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Estimated Fair Values of Financial Instruments (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Jun. 30, 2010
Jun. 30, 2009
Financial assets          
Cash and cash equivalents $ 655.6 $ 744.0 $ 809.5 $ 500.7 $ 357.5
Receivables 522.7 483.4      
Non-current investments 458.0 272.2      
Financial liabilities          
Long-term loans 2,321.2 1,360.7      
Accounts payable and provisions 751.9 669.9      
Interest payable 11.0 11.2      
Short-term loans and current portion of long-term loans 40.0 [1] 547.0 [1]      
Other non-current liabilities 13.9 13.5      
Carrying (Reported) Amount, Fair Value Disclosure
          
Financial assets          
Cash and cash equivalents 655.6 744.0      
Receivables 314.5 220.1      
Non-current investments 458.0 [2] 272.2 [2]      
Financial liabilities          
Long-term loans 2,321.2 1,360.7      
Accounts payable and provisions 678.1 601.6      
Interest payable 11.0 11.2      
Short-term loans and current portion of long-term loans 40.0 547.0      
Other non-current liabilities 13.9 13.5      
Fair value
          
Financial assets          
Cash and cash equivalents 655.6 744.0      
Receivables 314.5 220.1      
Non-current investments 464.6 [2] 271.2 [2]      
Financial liabilities          
Long-term loans 2,322.4 1,263.0      
Accounts payable and provisions 678.1 601.6      
Interest payable 11.0 11.2      
Short-term loans and current portion of long-term loans 40.0 547.0      
Other non-current liabilities $ 13.9 $ 13.5      
[1] The maturity of the loans has been 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.