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Unaudited Quarterly Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [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) |
2018 |  |  |  |  |  |  |  |
Net sales | $ | 1,858.4 |  |  | $ | 1,900.9 |  |  | $ | 1,817.0 |  |  | $ | 1,694.1 |  |
Gross profit | 316.3 |  |  | 331.4 |  |  | 267.4 |  |  | 225.3 |  |
Net income (loss) | 89.5 |  |  | 151.3 |  |  | 64.0 |  |  | (361.6 | ) | (2)
Net income (loss) attributable to AAM | 89.4 |  |  | 151.1 |  |  | 63.8 |  |  | (361.8 | ) | (2)
Basic EPS (1) | $ | 0.78 |  |  | $ | 1.31 |  |  | $ | 0.55 |  |  | $ | (3.24 | ) | (2)
Diluted EPS (1) | $ | 0.78 |  |  | $ | 1.30 |  |  | $ | 0.55 |  |  | $ | (3.24 | ) | (2)
2017 |  |  |  |  |  |  |  |
Net sales | $ | 1,049.9 |  |  | $ | 1,757.8 |  |  | $ | 1,724.4 |  |  | $ | 1,733.9 |  |
Gross profit | 210.7 |  |  | 316.4 |  |  | 297.7 |  |  | 294.3 |  |
Net income | 78.4 |  |  | 66.3 |  |  | 86.3 |  |  | 106.5 |  |
Net income attributable to AAM | 78.4 |  |  | 66.2 |  |  | 86.2 |  |  | 106.3 |  |
Basic EPS (1) | $ | 1.00 |  |  | $ | 0.59 |  |  | $ | 0.76 |  |  | $ | 0.93 |  |
Diluted EPS (1) | $ | 0.99 |  |  | $ | 0.59 |  |  | $ | 0.75 |  |  | $ | 0.93 |  |
(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.
(2) | In the fourth quarter of 2018, we recorded a goodwill impairment charge of approximately $400 million, net of tax, associated with the annual goodwill impairment test for our Powertrain and Casting segments. See Note 5 - Goodwill and Other Intangible Assets for further detail.

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109225645&loc=d3e1280-108306 + Details
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