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Earnings Per Share Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2014
Earnings (Loss) per Share (EPS) [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
 
2014
 
2013
 
2012
 
(in millions, except per share data)
Numerator
 
 
 
 
 
Net income attributable to AAM
$
143.0

 
$
94.5

 
$
367.7

Less: Net income attributable to participating securities
(2.9
)
 
(1.9
)
 
(2.6
)
Net income attributable to common shareholders - Basic
$
140.1

 
$
92.6

 
$
365.1

Undistributed earnings reallocated to common shareholders under two step dilutive method
—

 
—

 
—

Net income attributable to common shareholders - Dilutive
$
140.1

 
$
92.6

 
$
365.1

 
 
 
 
 
 
Denominators
 
 
 
 
 
Basic common shares outstanding -
 
 
 
 
 
Weighted-average shares outstanding
77.3

 
76.7

 
75.3

Less: Participating securities
(1.6
)
 
(1.5
)
 
(0.5
)
Weighted-average common shares outstanding
75.7

 
75.2

 
74.8

 
 
 
 
 
 
Effect of dilutive securities -
 
 
 
 
 
Dilutive stock-based compensation
0.2

 
0.1

 
0.1

 
 
 
 
 
 
Diluted shares outstanding -
 
 
 
 
 
Adjusted weighted-average shares after assumed conversions
75.9

 
75.3

 
74.9

 
 
 
 
 
 
Basic EPS
$
1.85

 
$
1.23

 
$
4.88

 
 
 
 
 
 
Diluted EPS
$
1.85

 
$
1.23

 
$
4.87