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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
Earnings per share
Reconciliation of the numerators and denominators for basic and diluted EPS computations is presented below:
 
 
2019
 
2018
 
2017
Net income attributable to AK Steel Holding Corporation
 
$
11.2

 
$
186.0

 
$
103.5

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

 
314.8

 
314.3

Effect of exchangeable debt
 
—

 
—

 
4.5

Effect of dilutive stock-based compensation
 
0.8

 
0.8

 
0.9

Common shares outstanding for diluted earnings per share
 
316.6

 
315.6

 
319.7

 
 
 
 
 
 
 
Basic earnings per share
 
$
0.04

 
$
0.59

 
$
0.33

Diluted earnings per share
 
$
0.04

 
$
0.59

 
$
0.32

 
 
 
 
 
 
 
Potentially issuable common shares (in millions) excluded from earnings per share calculation due to anti-dilutive effect
 
3.6

 
2.4

 
1.4