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Funded Status and Amounts Recognized by Gold Fields Group (Excluding South Deep) for Post-Retirement Health Care Costs (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Post-retirement health care liability | $ 2.1 |  | $ 2.1 |  |
Gold Fields Group (excluding South Deep) |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Actuarial present value | 2.1 |  | 2.1 |  |
Plan assets at fair value |  |  |  |  |
Accumulated benefit obligation in excess of plan assets | 2.1 |  | 2.1 |  |
Prior service costs |  |  |  |  |
Unrecognized net (gain)/loss |  |  |  |  |
Post-retirement health care liability | $ 2.1 | [1] | $ 2.1 | [1] | $ 2.6
[1] | Group (excluding South Deep) accrued post-retirement health care costs The Group has certain liabilities to subsidize the contributions payable by certain pensioners and dependants of ex-employees on a pay-as-you-go basis. The Group's contributions to these schemes on behalf of current and retired employees amounted to $0.1 million in fiscal 2012 (fiscal year ended December 31, 2011: $0.2 million; six months ended December 31, 2010: $0.5 million, fiscal year ended June 30, 2010: $0.2 million). The obligation has been actuarially valued at December 31, 2012 and the outstanding contributions will be funded over the lifetime of these pensioners and dependants. The following table sets forth the funded status and amounts recognized by the Group (excluding South Deep) for post-retirement health care costs: December 31, 2012 December 31, 2011 Actuarial present value 2.1 2.1 Plan assets at fair value - - Accumulated benefit obligation in excess of plan assets 2.1 2.1 Prior service costs - - Unrecognized net (gain)/loss - - Post-retirement health care liability 2.1 2.1 The following is a reconciliation of the benefit obligation: Balance at beginning of year 2.1 2.6 Service costs 0.2 0.1 Contributions paid (0.1 ) (0.2 ) Foreign currency translation adjustment (0.1 ) (0.4 ) Balance at end of year 2.1 2.1 The obligation has been valued using the projected unit credit funding method on past service liabilities. The valuation assumes a health care cost inflation rate of 7.5% per annum (December 31, 2011: 8.0%) and a discount rate of 8.0% per annum (December 31, 2011: 8.75%). December 31, 2012 December 31, 2011 December 31, 2010 June 30, 2010 The net periodic benefit cost is explained as follows: Service costs 0.2 0.1 (0.1 ) 0.9 Net periodic benefit cost 0.2 0.1 (0.1 ) 0.9 Assumed health care cost trend rates have a significant effect on the amounts reported for the health care plans. A one percentage point increase in assumed health care cost trend rates would have increased the aggregate of service and interest cost for the fiscal ended December 31, 2012 by $0.02 million (fiscal year ended December 31, 2011: $0.03 million; six months ended December 31, 2010: $0.01 million, fiscal year ended June 30, 2010: $0.1 million). The effect of this change on the accumulated post-retirement health care benefit obligation at December 31, 2012 would be an increase of $0.2 million (fiscal year ended December 31, 2011: $0.2 million). A one percentage point decrease in assumed health care cost trend rates would have decreased the aggregate of service and interest cost for the fiscal year ended December 31, 2012 by $0.01 million (fiscal year ended December 31, 2011: $0.01 million; six months ended December 31, 2010: $0.01 million, fiscal year ended June 30, 2010: $0.01 million). The effect of this change on the accumulated post-retirement health care benefit obligation at December 31, 2012 would be a decrease of $0.2 million (fiscal year ended December 31, 2011: $0.2 million).

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- Definition For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503844 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The pretax net amount of gains and losses that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income as they arise. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 158 -Paragraph 7 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph i -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=6867990&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 49 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d(iv)(b)(i) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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