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Earnings Per Share
 12 Months Ended
Dec. 31, 2013
Earnings Per Share [Abstract]  
Earnings Per Share
Earnings per Share
 

Reconciliation of the numerators and denominators for basic and diluted EPS computations is as follows:
 
 
2013
 
2012
 
2011
Net income (loss) attributable to AK Steel Holding Corporation
 
$
(46.8
)
 
$
(1,027.3
)
 
$
(155.6
)
Less: distributed earnings to common stockholders and holders of certain stock compensation awards
 
—

 
11.0

 
22.0

Undistributed earnings (loss)
 
$
(46.8
)
 
$
(1,038.3
)
 
$
(177.6
)
 
 
 
 
 
 
 
Common stockholders earnings—basic and diluted:
 
 
 
 
 
 
Distributed earnings to common stockholders
 
$
—

 
$
11.0

 
$
22.0

Undistributed earnings (loss) to common stockholders
 
(46.6
)
 
(1,034.6
)
 
(176.9
)
Common stockholders earnings (loss)—basic and diluted
 
$
(46.6
)
 
$
(1,023.6
)
 
$
(154.9
)
 
 
 
 
 
 
 
Common shares outstanding (weighted-average shares in millions):
 
 
 
 
 
 
Common shares outstanding for basic earnings per share
 
135.8

 
113.0

 
109.8

Effect of exchangeable debt
 
—

 
—

 
—

Effect of dilutive stock-based compensation
 
—

 
—

 
—

Common shares outstanding for diluted earnings per share
 
135.8

 
113.0

 
109.8

 
 
 
 
 
 
 
Basic and diluted earnings per share:
 
 
 
 
 
 
Distributed earnings
 
$
—

 
$
0.10

 
$
0.20

Undistributed earnings (loss)
 
(0.34
)
 
(9.16
)
 
(1.61
)
Basic and diluted earnings (loss) per share
 
$
(0.34
)
 
$
(9.06
)
 
$
(1.41
)
 
 
 
 
 
 
 
Potentially issuable common shares (in millions) excluded from earnings per share calculation due to anti-dilutive effect
 
2.6

 
2.4

 
1.2