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Property, Plant and Equipments (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Jun. 30, 2010
Property, Plant and Equipment [Line Items]
Cost	$ 12,083.9	$ 12,771.6	$ 11,038.9
Accumulated depreciation and amortization	(5,067.1)	(5,289.6)	(4,399.2)
Property, plant and equipment, net	7,016.8	7,482.0	6,639.7
Mining properties, mine development costs, mine plant facilities and mineral interests	6,021.3	6,940.4	6,396.1
Asset retirement costs	112.3	108.2	94.1
Other non-mining assets	883.2	433.4	149.5
Cumulative capitalized interest, net of amortization	122.3	120.5	119.7
Tarkwa Mine
Property, Plant and Equipment [Line Items]
Cumulative capitalized interest, net of amortization	14.4	15.9	16.6
Cerro Corona
Property, Plant and Equipment [Line Items]
Cumulative capitalized interest, net of amortization	75.4	81.3	84.5
SOUTH AFRICA
Property, Plant and Equipment [Line Items]
Cumulative capitalized interest, net of amortization	$ 32.5	$ 23.3	$ 18.6

X

- Definition

The amount of asset retirement costs previously incurred and capitalized separately from the capitalized amount of the associated long-lived assets.

+ References

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- Definition

Cumulative interest incurred in respect of assets requiring a substantial period of time to prepare for their intended future use and are capitalized to the date that the assets are substantially completed.

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- Definition

Mining assets, including mine development costs and mine plant facilities, is expenditure incurred to evaluate and develop new ore bodies, to define mineralization in existing ore bodies, to establish or expand productive capacity and is capitalized until commercial levels of production are achieved, at which times the costs are amortized. Mineral interests are defined as mineral and surface rights.

+ References

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X

- Definition

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

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-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

-Paragraph 5

-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.



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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 14

-Article 5



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-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

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-Paragraph 5

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-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.

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- Definition

Gross amount, at the balance sheet date, of long-lived physical assets used in the normal conduct of business and not intended for resale. This can include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

+ References

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-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

-Paragraph 5

-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 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229



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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.13)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 7

-Section 03

-Paragraph 8



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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 13

-Subparagraph a

-Article 5



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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 12

-Paragraph 5

-Subparagraph b, 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.



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- Definition

The net amount of capitalized assets classified as property, plant and equipment not otherwise defined in the taxonomy.

+ References

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