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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Earnings per share
Reconciliation of the numerators and denominators for basic and diluted EPS computations is presented below:
 
 
2017
 
2016
 
2015
Net income (loss) attributable to AK Steel Holding Corporation
 
$
103.5

 
$
(16.8
)
 
$
(652.3
)
Less: distributed earnings to common stockholders and holders of certain stock compensation awards
 
—

 
—

 
—

Undistributed earnings (loss)
 
$
103.5

 
$
(16.8
)
 
$
(652.3
)
 
 
 
 
 
 
 
Common stockholders earnings—basic and diluted:
 
 
 
 
 
 
Distributed earnings to common stockholders
 
$
—

 
$
—

 
$
—

Undistributed earnings (loss) to common stockholders
 
103.5

 
(16.7
)
 
(650.1
)
Common stockholders earnings (loss)—basic and diluted
 
$
103.5

 
$
(16.7
)
 
$
(650.1
)
 
 
 
 
 
 
 
Common shares outstanding (weighted-average shares in millions):
 
 
 
 
 
 
Common shares outstanding for basic earnings per share
 
314.3

 
230.0

 
177.2

Effect of Exchangeable Notes
 
4.5

 
—

 
—

Effect of dilutive stock-based compensation
 
0.9

 
—

 
—

Common shares outstanding for diluted earnings per share
 
319.7

 
230.0

 
177.2

 
 
 
 
 
 
 
Basic earnings per share:
 
 
 
 
 
 
Distributed earnings
 
$
—

 
$
—

 
$
—

Undistributed earnings (loss)
 
0.33

 
(0.07
)
 
(3.67
)
Basic earnings (loss) per share
 
$
0.33

 
$
(0.07
)
 
$
(3.67
)
 
 
 
 
 
 
 
Diluted earnings per share:
 
 
 
 
 
 
Distributed earnings
 
$
—

 
$
—

 
$
—

Undistributed earnings (loss)
 
0.32

 
(0.07
)
 
(3.67
)
Diluted earnings (loss) per share
 
$
0.32

 
$
(0.07
)
 
$
(3.67
)
 
 
 
 
 
 
 
Potentially issuable common shares (in millions) excluded from earnings per share calculation due to anti-dilutive effect
 
1.4

 
3.0

 
3.6