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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2019
Earnings Per Share [Abstract]  
Earnings per share
The computations for basic and diluted earnings per common share are as follows:
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
 
2019
 
2018
 
2019
 
2018
Net income attributable to AK Steel Holding Corporation
 
$
2.8

 
$
67.2

 
$
65.1

 
$
152.5

 
 
 
 
 
 
 
 
 
Common shares outstanding (weighted-average shares in millions):
 
 
 
 
 
 
 
 
Common shares outstanding for basic earnings per share
 
315.8

 
314.9

 
315.8

 
314.8

Effect of exchangeable debt
 
—

 
—

 
—

 
—

Effect of dilutive stock-based compensation
 
1.0

 
1.1

 
0.7

 
1.0

Common shares outstanding for diluted earnings per share
 
316.8

 
316.0

 
316.5

 
315.8

 
 
 
 
 
 
 
 
 
Basic earnings per share
 
$
0.01

 
$
0.21

 
$
0.21

 
$
0.48

Diluted earnings per share
 
$
0.01

 
$
0.21

 
$
0.21

 
$
0.48

 
 
 
 
 
 
 
 
 
Potentially issuable common shares (in millions) excluded from earnings per share calculation due to anti-dilutive effect
 
3.7

 
2.5

 
3.7

 
2.3