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Earnings Per Share
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Earnings Per Share
Earnings Per Share

The following table sets forth the calculation of basic and diluted net earnings per common share for the years ended December 31 ($ in millions, except shares in thousands and per share data in dollars):
 
2018
 
2017
 
2016
 
 
 
 
 
 
Earnings attributable to Centene Corporation
$
900

 
$
828

 
$
562

 
 
 
 
 
 
Shares used in computing per share amounts:
 

 
 
 
 
Weighted average number of common shares outstanding
390,248

 
344,853

 
319,135

Common stock equivalents (as determined by applying the treasury stock method)
8,258

 
8,551

 
8,816

Weighted average number of common shares and potential dilutive common shares outstanding
398,506

 
353,404

 
327,951

 
 
 
 
 
 
Net earnings per common share attributable to Centene Corporation:
 
 
 
 
 
Basic earnings per common share
$
2.31

 
$
2.40

 
$
1.76

Diluted earnings per common share
$
2.26

 
$
2.34

 
$
1.71



The calculation of diluted earnings per common share for 2018, 2017 and 2016 excludes the impact of 58 thousand shares, 106 thousand shares and 252 thousand shares, respectively, related to anti-dilutive stock options, restricted stock and restricted stock units.