Earnings per Common Share (Tables)
 3 Months Ended
Mar. 31, 2018
Earnings Per Share [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):
 
 
For the Three Months Ended
 
 
March 31,
 
 
2018
 
2017
Numerator:
 
 
 
 
Net income attributable to World Fuel
 
$
31.2

 
$
31.3

Denominator:
 
 
 
 
Weighted average common shares for basic earnings per common share
 
67.5

 
68.7

Effect of dilutive securities
 
0.4

 
0.4

Weighted average common shares for diluted earnings per common share
 
67.9

 
69.2

 
 
 
 
 
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
 
1.3

 
0.6

 
 
 
 
 
Basic earnings per common share
 
$
0.46

 
$
0.46

 
 
 
 
 
Diluted earnings per common share
 
$
0.46

 
$
0.45