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Income and Mining Tax Expense (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2012	Dec. 31, 2011	Jun. 30, 2010
Income Taxes [Line Items]
Current income and mining taxes	$ (159.5)	$ (411.8)	$ (436.4)	$ (234.0)
Deferred income and mining taxes	25.7	119.9	(115.6)	(124.4)
Income and mining tax expense	(133.8)	(291.9)	(552.0)	(358.4)
South Africa
Income Taxes [Line Items]
Current income and mining taxes	(39.0)	(72.4)	(108.3)	(67.7)
Deferred income and mining taxes	44.9	149.6	(70.1)	(58.6)
Ghana
Income Taxes [Line Items]
Current income and mining taxes	(73.4)	(170.6)	(180.5)	(98.6)
Deferred income and mining taxes	4.5	(36.8)	(12.0)	(28.1)
Australia
Income Taxes [Line Items]
Current income and mining taxes		(64.1)	(35.9)	(16.5)
Deferred income and mining taxes	(22.9)	(4.8)	(51.3)	(12.3)
Peru
Income Taxes [Line Items]
Current income and mining taxes	(47.1)	(104.7)	(111.7)	(51.2)
Deferred income and mining taxes	$ (0.8)	$ 11.9	$ 17.8	$ (25.4)

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The component of income tax expense for the period representing amounts of income taxes paid or payable (or refundable) for the period for all income tax obligations as determined by applying the provisions of relevant enacted tax laws to relevant amounts of taxable Income or Loss from continuing operations.

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The component of income tax expense for the period representing the increase (decrease) in the entity's deferred tax assets and liabilities pertaining to continuing operations.

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The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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