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Earnings Per Share (EPS) | 3 Months Ended
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Mar. 31, 2013
Earnings (Loss) per Share (EPS) [Abstract] |
Earnings Per Share [Text Block] | 10. EARNINGS PER SHARE (EPS) The following table sets forth the computation of our basic and diluted EPS:
|  | Three Months Ended
|  | March 31,
|  | 2013 |  | 2012
|  | (in millions, except per share data)
Numerator |  |  |  |
Net income attributable to AAM |  | $ | 7.3 |  |  | $ | 51.2 |
Denominator |  |  |  |  |  |
Basic shares outstanding - |  |  |  |  |  |
Weighted-average shares outstanding |  | 76.2 |  |  | 75.0 |
Effect of dilutive securities |  |  |  |  |  |
Dilutive stock-based compensation |  | — |  |  | — |
Diluted shares outstanding - |  |  |  |  |  |
Adjusted weighted-average shares after assumed conversions |  | 76.2 |  |  | 75.0 |
Basic EPS |  | $ | 0.10 |  |  | $ | 0.68 |
Diluted EPS |  | $ | 0.10 |  |  | $ | 0.68 |
Certain exercisable stock options were excluded in 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 2.3 million at March 31, 2013 and 3.3 million at March 31, 2012. The ranges of exercise prices related to the excluded exercisable stock options were $15.58 - $40.83 a t March 31, 2013 and March 31, 2012.

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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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