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Valuation Allowance for Deferred Tax Assets (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Jun. 30, 2010
Valuation Allowance [Line Items]
Valuation allowance for deferred tax assets	$ 152.4	$ 192.5	$ 195.3
Orogen Investments SA (Luxembourg)
Valuation Allowance [Line Items]
Valuation allowance for deferred tax assets	39.2	40.9	43.7
Gold Fields Arctic Platinum Oy
Valuation Allowance [Line Items]
Valuation allowance for deferred tax assets	30.3	28.3	26.2
Living Gold (Pty) Limited
Valuation Allowance [Line Items]
Valuation allowance for deferred tax assets	3.9	6.5	5.6
Gold Fields Operations
Valuation Allowance [Line Items]
Valuation allowance for deferred tax assets	33.2	53.1	55.0
GFI Joint Venture Holdings
Valuation Allowance [Line Items]
Valuation allowance for deferred tax assets	44.6	62.2	63.6
Other
Valuation Allowance [Line Items]
Valuation allowance for deferred tax assets	$ 1.2	$ 1.5	$ 1.2

The sum of the portions of deferred tax assets as of the balance sheet date for which, based on the weight of available evidence, it is more likely than not will not be realized through future reductions of tax-based income.

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