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Scrip Loan (Detail) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended			1 Months Ended				12 Months Ended
	Dec. 31, 2010 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Jun. 30, 2010 USD ($)	Apr. 05, 2011 Collateralized Scrip Loan USD ($)	Apr. 05, 2011 Collateralized Scrip Loan ZAR	Mar. 26, 2010 Collateralized Scrip Loan USD ($)	Mar. 26, 2010 Collateralized Scrip Loan ZAR	Dec. 31, 2012 Collateralized Scrip Loan USD ($)	Dec. 31, 2011 Collateralized Scrip Loan USD ($)
Debt Instrument [Line Items]
Opening balance		$ 1,907.7								$ 21.4
Interest										0.3
Loans advanced	1,543.8	1,451.0	1,167.9	1,619.9	18.8	127.0	19.5	144.0	0	18.2
Loans repaid	(1,330.8)	(975.9)	(654.6)	(1,637.5)	(18.8)	(127.0)				(39.6)
Translation										(0.3)
Closing balance		$ 2,361.2	$ 1,907.7

X

- Definition

The increase (decrease) in cumulative translation adjustment before transfers included in determining net income.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 830

-SubTopic 30

-Section 45

-Paragraph 20

-Subparagraph (b),(c)

-URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32211-110900



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 130

-Paragraph 23, 24, 25, 26

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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Increase for accrued, but unpaid interest on the debt instrument for the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(f))

-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690



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

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-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph f

-Article 4

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