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Unaudited Quarterly Financial Data Unaudited Quarterly Financial Data (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Net sales $ 831.3 $ 820.8 $ 799.6 $ 755.6 $ 736.7 $ 702.9 $ 739.8 $ 751.5 $ 3,207.3 $ 2,930.9 $ 2,585.0
Gross profit 126.9 125.3 122.2 104.3 84.0 90.7 85.8 139.2 478.7 399.7 455.1
Net income (loss) 29.8 31.6 25.8 7.3 319.9 (8.2) 4.7 50.3 94.5 366.7 137.1
Net income (loss) attributable to AAM $ 29.8 $ 31.6 $ 25.8 $ 7.3 $ 319.9 $ (8.1) $ 4.7 $ 51.2 $ 94.5 $ 367.7 $ 142.8
Basic earnings (loss) per share $ 0.39 $ 0.41 $ 0.34 $ 0.10 $ 4.21 $ (0.11) $ 0.06 $ 0.68 $ 1.23 $ 4.88 $ 1.91
Diluted earnings (loss) per share $ 0.39 $ 0.41 $ 0.34 $ 0.10 $ 4.21 $ (0.11) $ 0.06 $ 0.68 $ 1.23 $ 4.87 $ 1.89