2.2.0.7 false Basis of Presentation 00910 - Disclosure - Basis of Presentation true false false false 1 USD false false Monetary Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 EarninsPerShareUSD Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 $ 2 Basis Of Presentation Abstract 0 au_BasisOfPresentationAbstract au false na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 3 Basis Of Presentation Text Block 1 au_BasisOfPresentationTextBlock au false na duration Description of the basis of presentation used in completing this document false false false false false false false false false false false false 1 false false false false 0 0 The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("US GAAP") for interim financial information. Accordingly, they do not include all of the information and footnotes required by US GAAP for annual financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. Operating results for the six-month period ended June 30, 2010 are not necessarily indicative of the results that may be expected for the year ending December 31, 2010.The balance sheet as at December 31, 2009 has been derived from the audited financial statements at that date but does not include all of the information and footnotes required by US GAAP for complete financial statements.For further information, refer to the consolidated financial statements for the years ended December 31, 2009, 2008 and 2007 and as at December 31, 2009 and 2008 and footnotes thereto included in the Company's Form 6-K dated August 11, 2010 The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the false false false us-types:textBlockItemType textblock Description of the basis of presentation used in completing this document No authoritative reference available. false 1 2 false UnKnown UnKnown UnKnown false true