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Earnings Per Share (EPS) | 9 Months Ended
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Sep. 30, 2012
Earnings (Loss) per Share (EPS) [Abstract] |
Earnings Per Share [Text Block] | EARNINGS PER SHARE (EPS) The following table sets forth the computation of our basic and diluted EPS:
|  | Three Months Ended |  | Nine Months Ended
|  | September 30, |  | September 30,
|  | 2012 |  | 2011 |  | 2012 |  | 2011
|  | (in millions, except per share data)
Numerator |  |  |  |  |  |  |  |
Net income (loss) attributable to AAM |  | $ | (8.1 | ) |  | $ | 24.8 |  |  | $ | 47.8 |  |  | $ | 111.7 |
Denominator |  |  |  |  |  |  |  |  |  |  |  |
Basic shares outstanding - |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average shares outstanding |  | 74.9 |  |  | 75.4 |  |  | 75.2 |  |  | 74.8 |
Effect of dilutive securities |  |  |  |  |  |  |  |  |  |  |  |
Dilutive stock-based compensation |  | — |  |  | — |  |  | — |  |  | 0.1 |
Dilutive GM warrants |  | — |  |  | — |  |  | — |  |  | 0.5 |
Diluted shares outstanding - |  |  |  |  |  |  |  |  |  |  |  |
Adjusted weighted-average shares after assumed conversions |  | 74.9 |  |  | 75.4 |  |  | 75.2 |  |  | 75.4 |
Basic EPS |  | $ | (0.11 | ) |  | $ | 0.33 |  |  | $ | 0.64 |  |  | $ | 1.49 |
Diluted EPS |  | $ | (0.11 | ) |  | $ | 0.33 |  |  | $ | 0.63 |  |  | $ | 1.48 |
Certain exercisable stock options were excluded from the computations of diluted EPS because the exercise price of these options was greater than the average period market prices. The number of stock options outstanding, which were not included in the calculation of diluted EPS, was 3.3 million at September 30, 2012 and 4.1 million at September 30, 2011. The ranges of exercise prices related to the excluded exercisable stock options were $15.58 - $40.83 at September 30, 2012 and $15.56 - $40.83 at September 30, 2011. The computation of diluted EPS for the three months ended September 30, 2012 excludes 1.0 million shares of unvested share-based payment awards that contain nonforfeitable rights to dividends or dividend equivalents as we were in a loss position and these participating securities are not obligated to fund losses. As part of the 2009 Settlement and Commercial Agreement, we issued to GM five year warrants, which entitled GM to purchase 4.1 million shares of AAM's common stock at an exercise price of $2.76 per share. In the first quarter of 2011, GM exercised these warrants. In accordance with the cashless exercise option available in the agreement, we issued 3.3 million net shares of common stock to GM.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=16381557&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1278-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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