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Earnings Per Share (EPS) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
 [1]
Mar. 31, 2020
 [2]
Dec. 31, 2019
 [3]
Sep. 30, 2019
 [4]
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Numerator [Abstract]                      
Net Loss Attributable to AAM $ 36.0 $ 117.2 $ (213.2) $ (501.3) $ (454.4) $ (124.2) $ 52.5 $ 41.6 $ (561.3) $ (484.5) $ (57.5)
Less: Net income allocated to participating securities                 0.0 0.0 0.0
Net loss attributable to common shareholders - Basic and Dilutive                 $ (561.3) $ (484.5) $ (57.5)
Denominator [Abstract]                      
Weighted-average shares outstanding                 117.9 115.6 115.0
Less: Participating securities                 (4.8) (3.3) (3.4)
Weighted-average common shares outstanding                 113.1 112.3 111.6
Dilutive stock-based compensation                 0.0 0.0 0.0
Diluted shares outstanding - adjusted weighted-average shares after assumed conversions                 113.1 112.3 111.6
Basic loss per share $ 0.30 [5] $ 0.99 [5] $ (1.88) [5] $ (4.45) [5] $ (4.04) $ (1.10) $ 0.45 $ 0.36 $ (4.96) $ (4.31) $ (0.51)
Diluted loss per share $ 0.30 [5] $ 0.99 [5] $ (1.88) [5] $ (4.45) [5] $ (4.04) $ (1.10) $ 0.45 $ 0.36 $ (4.96) $ (4.31) $ (0.51)
[1] Many of our plant locations temporarily suspended production or experienced a significant reduction in production volumes during the second quarter of 2020 as a result of the impact of COVID-19.
[2] In the first quarter of 2020, we recorded a goodwill impairment charge of $510 million that was not subject to tax effect as a result of the significant decline in automotive production volumes due to the impact of COVID-19.
[3] In the fourth quarter of 2019, we recorded a goodwill impairment charge of $440 million that was not subject to tax effect associated with the annual goodwill impairment test for our Metal Forming reporting unit. We also recorded a loss on the Casting Sale of approximately $17 million, net of tax, recognized a gain on bargain purchase of approximately $10.8 million, which was not subject to tax effect, associated with the acquisition of Mitec, and recognized a loss of approximately $8 million, net of tax, related to pension settlements.
[4] In the third quarter of 2019, we recorded an impairment charge of approximately $178 million, net of tax, to reduce the carrying value of our U.S. Casting operations to fair value less cost to sell upon reclassification of the assets and liabilities to held-for-sale.
[5] Full year basic and diluted EPS will not necessarily agree to the sum of the four quarters because each quarter is a separate calculation.