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Unaudited Quarterly Financial Data Unaudited Quarterly Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2014
Unaudited Quarterly Financial Data [Abstract] |
Schedule of Quarterly Financial Information [Table Text Block] |
| Three Months Ended,
| March 31 |  | June 30 |  | September 30 |  | December 31
| (in millions, except per share data)
2014 |  |  |  |  |  |  |
Net sales | $ | 858.8 |  |  | $ | 946.9 |  |  | $ | 950.8 |  |  | $ | 939.5 |
Gross profit | 121.9 |  |  | 149.0 |  |  | 140.7 |  |  | 111.2 |
Net income | 33.6 |  |  | 52.2 |  |  | 44.0 |  |  | 13.2 |
Net income attributable to AAM | 33.6 |  |  | 52.2 |  |  | 44.0 |  |  | 13.2 |
Basic EPS (1) | $ | 0.44 |  |  | $ | 0.67 |  |  | $ | 0.57 |  |  | $ | 0.17 |
Diluted EPS (1) | $ | 0.44 |  |  | $ | 0.67 |  |  | $ | 0.57 |  |  | $ | 0.17 |
2013 |  |  |  |  |  |  |
Net sales | $ | 755.6 |  |  | $ | 799.6 |  |  | $ | 820.8 |  |  | $ | 831.3 |
Gross profit | 104.3 |  |  | 122.2 |  |  | 125.3 |  |  | 126.9 |
Net income | 7.3 |  |  | 25.8 |  |  | 31.6 |  |  | 29.8 |
Net income attributable to AAM | 7.3 |  |  | 25.8 |  |  | 31.6 |  |  | 29.8 |
Basic EPS (1) | $ | 0.10 |  |  | $ | 0.34 |  |  | $ | 0.41 |  |  | $ | 0.39 |
Diluted EPS (1) | $ | 0.10 |  |  | $ | 0.34 |  |  | $ | 0.41 |  |  | $ | 0.39 |
(1) Full year basic and diluted EPS will not necessarily agree to the sum of the four quarters because each quarter is a separate calculation.

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- Definition Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=35737889&loc=d3e1280-108306 + Details
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