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Reconciliation of Total Liability for Environmental Rehabilitation (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2011	Jun. 30, 2010	Jun. 30, 2009
Asset Retirement Obligation, Opening balance
Opening balance	$ 275.7	$ 324.4	$ 236.9
Addition to liabilities	12.3	18.7	11.9
Liabilities settled	(2.1)	(1.7)	(4.3)
Accretion of liability	10.9	24.9	19.3	13.9
Foreign currency translation adjustment	27.6	(29.4)	11.9
Asset Retirement Obligation, Balance at close	$ 324.4	$ 336.9	$ 275.7	$ 236.9

X

- Definition

The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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-Name Statement of Financial Accounting Standard (FAS)

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Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

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Amount of the Increase or Decrease in the amount of asset retirement obligations for the period associated with foreign currency translation (to the extent that the entity accounts for the foreign currency effects as a separate component of the change in the liability).

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