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Basis of Presentation and Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2018
Basis of Presentation and Significant Accounting Policies  
Computation of basic and diluted earnings per common share The following table sets forth the computation of basic and diluted earnings per common share for the periods presented (in millions, except per share amounts):
 
2018
 
2017
 
2016
Numerator:
 
 
 
 
 
Net income (loss) attributable to World Fuel
$
127.7

 
$
(170.2
)
 
$
126.5

Denominator:
 
 
 
 
 
Weighted average common shares for basic earnings per common share
67.4

 
68.1

 
69.3

Effect of dilutive securities
0.3

 
—

 
0.5

Weighted average common shares for diluted earnings per common share
67.7

 
68.1

 
69.8

Weighted average securities which are not included in the calculation of diluted earnings per common share because their impact is anti-dilutive or their performance conditions have not been met
1.2

 
1.4

 
1.3

Basic earnings (loss) per common share
$
1.89

 
$
(2.50
)
 
$
1.82

Diluted earnings (loss) per common share
$
1.89

 
$
(2.50
)
 
$
1.81