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Earnings Per Share (Tables)
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Earnings Per Share [Abstract]    
Earnings per share
 
 
Three Months Ended March 31,
 
 
2016
 
2015
Net income (loss) attributable to AK Steel Holding Corporation
 
$
(13.6
)
 
$
(306.3
)
Less: distributed earnings to common stockholders and holders of certain stock compensation awards
 
—

 
—

Undistributed earnings (loss)
 
$
(13.6
)
 
$
(306.3
)
 
 
 
 
 
Common stockholders earnings—basic and diluted:
 
 
 
 
Distributed earnings to common stockholders
 
$
—

 
$
—

Undistributed earnings (loss) to common stockholders
 
(13.5
)
 
(305.1
)
Common stockholders earnings (loss)—basic and diluted
 
$
(13.5
)
 
$
(305.1
)
 
 
 
 
 
Common shares outstanding (weighted-average shares in millions):
 
 
 
 
Common shares outstanding for basic earnings per share
 
177.5

 
177.0

Effect of exchangeable debt
 
—

 
—

Effect of dilutive stock-based compensation
 
—

 
—

Common shares outstanding for diluted earnings per share
 
177.5

 
177.0

 
 
 
 
 
Basic and diluted earnings per share:
 
 
 
 
Distributed earnings
 
$
—

 
$
—

Undistributed earnings (loss)
 
(0.08
)
 
(1.72
)
Basic and diluted earnings (loss) per share
 
$
(0.08
)
 
$
(1.72
)
 
 
 
 
 
Potentially issuable common shares (in millions) excluded from earnings per share calculation due to anti-dilutive effect
 
3.9

 
3.0
Reconciliation of the numerators and denominators for basic and diluted EPS computations is presented below:
 
 
2015
 
2014
 
2013
Net income (loss) attributable to AK Steel Holding Corporation
 
$
(509.0
)
 
$
(96.9
)
 
$
(46.8
)
Less: distributed earnings to common stockholders and holders of certain stock compensation awards
 
—

 
—

 
—

Undistributed earnings (loss)
 
$
(509.0
)
 
$
(96.9
)
 
$
(46.8
)
 
 
 
 
 
 
 
Common stockholders earnings—basic and diluted:
 
 
 
 
 
 
Distributed earnings to common stockholders
 
$
—

 
$
—

 
$
—

Undistributed earnings (loss) to common stockholders
 
(507.3
)
 
(96.6
)
 
(46.6
)
Common stockholders earnings (loss)—basic and diluted
 
$
(507.3
)
 
$
(96.6
)
 
$
(46.6
)
 
 
 
 
 
 
 
Common shares outstanding (weighted-average shares in millions):
 
 
 
 
 
 
Common shares outstanding for basic earnings per share
 
177.2

 
148.1

 
135.8

Effect of exchangeable debt
 
—

 
—

 
—

Effect of dilutive stock-based compensation
 
—

 
—

 
—

Common shares outstanding for diluted earnings per share
 
177.2

 
148.1

 
135.8

 
 
 
 
 
 
 
Basic and diluted earnings per share:
 
 
 
 
 
 
Distributed earnings
 
$
—

 
$
—

 
$
—

Undistributed earnings (loss)
 
(2.86
)
 
(0.65
)
 
(0.34
)
Basic and diluted earnings (loss) per share
 
$
(2.86
)
 
$
(0.65
)
 
$
(0.34
)
 
 
 
 
 
 
 
Potentially issuable common shares (in millions) excluded from earnings per share calculation due to anti-dilutive effect
 
3.6

 
9.7

 
2.6