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Earnings Per Share (EPS) (Tables)
 12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
The following table sets forth the computation of our basic and diluted EPS available to shareholders of common stock (excluding participating securities):
 
2019
 
2018
 
2017
 
(in millions, except per share data)
Numerator
 
 
 
 
 
Net income (loss) attributable to AAM
$
(484.5
)
 
$
(57.5
)
 
$
337.1

Less: Net income allocated to participating securities
—

 
—

 
(7.5
)
Net income (loss) attributable to common shareholders - Basic and Dilutive
$
(484.5
)
 
$
(57.5
)
 
$
329.6

 
 
 
 
 
 
Denominators
 
 
 
 
 
Basic common shares outstanding -
 
 
 
 
 
Weighted-average shares outstanding
115.6

 
115.0

 
104.6

Less: Participating securities
(3.3
)
 
(3.4
)
 
(2.3
)
Weighted-average common shares outstanding
112.3

 
111.6

 
102.3

 
 
 
 
 
 
Effect of dilutive securities -
 
 
 
 
 
Dilutive stock-based compensation
—

 
—

 
0.5

 
 
 
 
 
 
Diluted shares outstanding -
 
 
 
 
 
Adjusted weighted-average shares after assumed conversions
112.3

 
111.6

 
102.8

 
 
 
 
 
 
Basic EPS
$
(4.31
)
 
$
(0.51
)
 
$
3.22

 
 
 
 
 
 
Diluted EPS
$
(4.31
)
 
$
(0.51
)
 
$
3.21