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Provision Calculation using Undiscounted Closure Cost Estimates (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Asset Retirement Obligations [Line Items]
Total closure cost estimate	$ 355.2	$ 492.4
South Africa
Asset Retirement Obligations [Line Items]
Total closure cost estimate	33.3	246.6
Ghana
Asset Retirement Obligations [Line Items]
Total closure cost estimate	83.3	79.3
Australia
Asset Retirement Obligations [Line Items]
Total closure cost estimate	196.6	125.1
Peru
Asset Retirement Obligations [Line Items]
Total closure cost estimate	$ 42.0	$ 41.4

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- Definition

Undiscounted amount of the accrual for environmental loss contingencies.

+ 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.Q1)

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



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

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section Y

-Paragraph Question 1



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 30

-Section 50

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859

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