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Finance Expenses (Detail) (USD $) In Millions, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2010 | Dec. 31, 2011 | Jun. 30, 2010 | Jun. 30, 2009
Component of Other Expense, Nonoperating [Line Items] |  |  |  |
Interest expense-preference share dividend | $ (3.1) | $ (1.3) | $ (5.9) | $ (9.8)
Interest expense-other | (33.3) | (62.3) | (65.8) | (92.8)
Total finance expense | (36.4) | (63.6) | (71.7) | (137.5)
Capitalized interest | 4.7 | 9.3 | 6.5 | 63.6
Finance expense | (31.7) | (54.3) | (65.2) | (73.9)
Mvelaphanda Resources Limited |  |  |  |
Component of Other Expense, Nonoperating [Line Items] |  |  |  |
Interest expense-Mvelaphanda loan |  |  |  | $ (34.9)

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- Definition The amount of interest that was capitalized during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 34 -Paragraph 21 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
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