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Reconciliation of Total Liability for Environmental Rehabilitation (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2013
Provision for environmental rehabilitation
Opening balance	$ 373.6	$ 336.9
Addition to liabilities - continuing operations	10.3	6.3
Addition to liabilities - discontinued operations		11.8
Liabilities settled - continuing operations	(2.5)	(2.7)
Accretion of liability - continuing operations	10.4	13.9
Accretion of liability - discontinued operations	2.2	14.3
Yilgarn South asset purchase	55.0		55.0
Spin-off of Sibanye Gold	(154.9)
Foreign currency translation adjustment	(24.9)	(6.9)
Closing balance of provision for environmental rehabilitation	$ 269.2	$ 373.6

X

- Definition

Amount of accretion expense for continuing operations, which includes, but is not limited to, accretion expense from asset retirement obligations, environmental remediation obligations, and other contingencies.

+ References

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- Definition

Amount of accretion expense for continuing operations, which includes, but is not limited to, accretion expense from asset retirement obligations, environmental remediation obligations, and other contingencies.

+ References

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- Definition

Amount of the Increase or Decrease in the amount of the asset retirement obligation of continuing operations during the current period for changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation.

+ References

No definition available.

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- Definition

Amount of the Increase or Decrease in the amount of the asset retirement obligation of discontinued operations during the current period for changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation.

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Asset Retirement Obligation Spin Off Of Company

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- Definition

Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Environmental Rehabilitation Provision

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- Definition

Amount of the Increase or Decrease in the amount of asset retirement obligations for the period associated with foreign currency translation (to the extent that the entity accounts for the foreign currency effects as a separate component of the change in the liability).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

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- Definition

Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

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- Definition

Amount of a reclamation and mine closing liability that is associated with a legal obligation for the closure and reclamation of a mine including the removal of buildings, equipment, machinery and other physical remnants of mining, closure of tailings impoundments, leach pads and other mine features, and contouring, covering and revegetation of waste rock piles and other disturbed areas.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 5.Y.Q2)

-URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751

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