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Organization and Basis of Presentation Accounts Receivable (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2009 | Dec. 31, 2011 | Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
2009 GM Settlement and Commercial Agreement, Early Payment Discount | 1.00% |  |
Allowance for Doubtful Accounts Receivable, Current |  | $ 5.5 | $ 6.2

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- Definition Represents the early payment discount provided to GM as part of the 2009 Settlement and Commercial Agreement between AAM and GM in which GM agreed to payment terms of Net 10 days in exchange for the aforementioned early payment discount. + References No definition available. + Details
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- Details
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- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6965416&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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