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Earnings Per Share (Tables)
 6 Months Ended
Jun. 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 June 30,
 
Six Months Ended June 30,
 
 
2019
 
2018
 
2019
 
2018
Net income attributable to AK Steel Holding Corporation
 
$
66.8

 
$
56.6

 
$
62.3

 
$
85.3

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

 
314.7

 
315.7

 
314.7

Effect of exchangeable debt
 
—

 
—

 
—

 
—

Effect of dilutive stock-based compensation
 
0.7

 
1.0

 
0.7

 
1.0

Common shares outstanding for diluted earnings per share
 
316.5

 
315.7

 
316.4

 
315.7

 
 
 
 
 
 
 
 
 
Basic earnings per share
 
$
0.21

 
$
0.18

 
$
0.20

 
$
0.27

Diluted earnings per share
 
$
0.21

 
$
0.18

 
$
0.20

 
$
0.27

 
 
 
 
 
 
 
 
 
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