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Unaudited Quarterly Financial Data (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Net Sales | $ 736.7 | $ 702.9 | $ 739.8 | $ 751.5 | $ 605.6 | $ 647.6 | $ 686.2 | $ 645.6 | $ 2,930.9 | $ 2,585.0 | $ 2,283.0
Gross profit | 84.0 | 90.7 | 85.8 | 139.2 | 105.7 | 103.5 | 130.5 | 115.4 | 399.7 | 455.1 | 401.7
Net income (loss) | 319.9 | (8.2) | 4.7 | 50.3 | 30.0 | 22.6 | 47.9 | 36.6 | 366.7 | 137.1 | 114.5
Net income (loss) attributable to AAM | $ 319.9 | $ (8.1) | $ 4.7 | $ 51.2 | $ 31.1 | $ 24.8 | $ 49.2 | $ 37.7 | $ 367.7 | $ 142.8 | $ 115.4
Basic earnings (loss) per share | $ 4.21 | $ (0.11) | $ 0.06 | $ 0.68 | $ 0.41 | $ 0.33 | $ 0.65 | $ 0.51 | $ 4.88 | $ 1.91 | $ 1.61
Diluted earnings (loss) per share | $ 4.21 | $ (0.11) | $ 0.06 | $ 0.68 | $ 0.41 | $ 0.33 | $ 0.65 | $ 0.50 | $ 4.87 | $ 1.89 | $ 1.55

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