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Earnings per Common Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Numerator:        
Net income attributable to World Fuel $ 49.6 $ 55.7 $ 135.1 $ 154.6
Denominator:        
Weighted average common shares for basic earnings per common share 70.0 70.8 70.5 70.8
Effect of dilutive securities (in shares) 0.3 0.5 0.5 0.5
Weighted average common shares for diluted earnings per common share 70.3 71.3 71.0 71.3
Weighted average securities which are not included in the calculation of diluted earnings per common share (in shares) 1.5 0.8 1.0 0.8
Basic earnings per common share (in dollars per share) $ 0.71 $ 0.79 $ 1.92 $ 2.18
Diluted earnings per common share (in dollars per share) $ 0.71 $ 0.78 $ 1.90 $ 2.17