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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, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Net Sales $ 605.6 $ 647.6 $ 686.2 $ 645.6 $ 583.3 $ 618.2 $ 559.6 $ 521.9 $ 2,585.0 $ 2,283.0 $ 1,521.6
Gross profit (loss) 105.7 103.5 130.5 115.4 101.6 113.9 98.9 87.3 455.1 401.7 (31.1)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest 30.0 22.6 47.9 36.6 34.3 38.7 25.3 16.2 137.1 114.5 (253.3)
Net income (loss) attributable to AAM $ 31.1 $ 24.8 $ 49.2 $ 37.7 $ 34.9 $ 38.8 $ 25.4 $ 16.3 $ 142.8 $ 115.4 $ (253.1)
Earnings Per Share, Basic $ 0.41 $ 0.33 $ 0.65 $ 0.51 $ 0.49 $ 0.54 $ 0.36 $ 0.23 $ 1.91 $ 1.61 $ (4.81)
Earnings Per Share, Diluted $ 0.41 $ 0.33 $ 0.65 $ 0.50 $ 0.47 $ 0.52 $ 0.34 $ 0.22 $ 1.89 $ 1.55 $ (4.81)