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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2017
Earnings Per Share [Abstract]  
Earnings per share
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
 
2017
 
2016
 
2017
 
2016
Net income (loss) attributable to AK Steel Holding Corporation
 
$
(5.8
)
 
$
50.9

 
$
117.9

 
$
54.6

Less: distributed earnings to common stockholders and holders of certain stock compensation awards
 
—

 
—

 
—

 
—

Undistributed earnings
 
$
(5.8
)
 
$
50.9

 
$
117.9

 
$
54.6

 
 
 
 
 
 
 
 
 
Common stockholders earnings—basic and diluted:
 
 
 
 
 
 
 
 
Distributed earnings to common stockholders
 
$
—

 
$
—

 
$
—

 
$
—

Undistributed earnings to common stockholders
 
(5.8
)
 
50.8

 
117.7

 
54.4

Common stockholders earnings—basic and diluted
 
$
(5.8
)
 
$
50.8

 
$
117.7

 
$
54.4

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

 
237.5

 
314.2

 
210.6

Effect of exchangeable debt
 
—

 
—

 
5.9

 
—

Effect of dilutive stock-based compensation
 
—

 
0.9

 
1.0

 
0.8

Common shares outstanding for diluted earnings per share
 
314.3

 
238.4

 
321.1

 
211.4

 
 
 
 
 
 
 
 
 
Basic earnings per share:
 
 
 
 
 
 
 
 
Distributed earnings
 
$
—

 
$
—

 
$
—

 
$
—

Undistributed earnings
 
(0.02
)
 
0.21

 
0.37

 
0.26

Basic earnings per share
 
$
(0.02
)
 
$
0.21

 
$
0.37

 
$
0.26

 
 
 
 
 
 
 
 
 
Diluted earnings per share:
 
 
 
 
 
 
 
 
Distributed earnings
 
$
—

 
$
—

 
$
—

 
$
—

Undistributed earnings
 
(0.02
)
 
0.21

 
0.37

 
0.26

Diluted earnings per share
 
$
(0.02
)
 
$
0.21

 
$
0.37

 
$
0.26

 
 
 
 
 
 
 
 
 
Potentially issuable common shares (in millions) excluded from earnings per share calculation due to anti-dilutive effect
 
4.1

 
1.9

 
1.1

 
2.3