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Commitment (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Commitments and Contingencies Disclosure [Line Items] |  |
Commitments | $ 1,257.3 | $ 1,243.1
Other guarantees | 0.5 | 1.7
Capital Expenditure -Authorized | South Africa | Driefontein Kloof Complex |  |
Commitments and Contingencies Disclosure [Line Items] |  |
Commitments | 401.0 | 373.7
Capital Expenditure -Authorized | South Africa | Beatrix |  |
Commitments and Contingencies Disclosure [Line Items] |  |
Commitments | 104.8 | 87.1
Capital Expenditure -Authorized | South Africa | South Deep Gold Mine |  |
Commitments and Contingencies Disclosure [Line Items] |  |
Commitments | 446.3 | 433.1
Capital Expenditure -Authorized | Ghana | Tarkwa Mine |  |
Commitments and Contingencies Disclosure [Line Items] |  |
Commitments | 110.9 | 126.5
Capital Expenditure -Authorized | Ghana | Damang |  |
Commitments and Contingencies Disclosure [Line Items] |  |
Commitments | 9.8 | 16.9
Capital Expenditure -Authorized | Peru | Cerro Corona |  |
Commitments and Contingencies Disclosure [Line Items] |  |
Commitments | 6.4 | 44.7
Capital Expenditure -Authorized | Australia | St Ives |  |
Commitments and Contingencies Disclosure [Line Items] |  |
Commitments | 175.7 | 150.3
Capital Expenditure -Authorized | Australia | Agnew |  |
Commitments and Contingencies Disclosure [Line Items] |  |
Commitments | 1.6 | 10.4
Capital Expenditure -Authorized | Other Countries |  |
Commitments and Contingencies Disclosure [Line Items] |  |
Commitments | 0.8 | 0.4
Capital Expenditure -Contracted |  |
Commitments and Contingencies Disclosure [Line Items] |  |
Commitments | $ 244.6 | $ 245.7

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents commitments outstanding as of the balance sheet date which obligate or represent potential claims against the assets of the Company relating to, for example, the extension of credit. Further, commitments generally represent off balance sheet arrangements that obligate the entity to deliver assets or services or enter into another obligation in the future. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 17 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.25) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 25 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 7 + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount of contractual guarantees to which the Company is obligated as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12201-110248 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 45 -Paragraph 3, 8, 15 -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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