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Basis of Presentation, New Accounting Standards and Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2019
Accounting Policies [Abstract]  
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):
 
2019
 
2018
 
2017
Numerator:
 
 
 
 
 
Net income (loss) attributable to World Fuel
$
178.9

 
$
127.7

 
$
(170.2
)
Denominator:
 
 
 
 
 
Weighted average common shares for basic earnings per common share
66.1

 
67.4

 
68.1

Effect of dilutive securities
0.4

 
0.3

 
—

Weighted average common shares for diluted earnings per common share
66.5

 
67.7

 
68.1

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
1.4

 
1.2

 
1.4

Basic earnings (loss) per common share
$
2.71

 
$
1.89

 
$
(2.50
)
Diluted earnings (loss) per common share
$
2.69

 
$
1.89

 
$
(2.50
)