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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
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