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Earnings per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Numerator:        
Net income attributable to World Fuel $ 21.7 $ 82.0 $ 58.2 $ 113.1
Denominator:        
Weighted average common shares for basic earnings per common share (in shares) 63,000 63,400 63,100 63,900
Effect of dilutive securities (in shares) 300 200 400 300
Weighted average common shares for diluted earnings per common share (in shares) 63,300 63,600 63,600 64,100
Basic earnings (loss) per common share (in dollars per share) $ 0.34 $ 1.29 $ 0.92 $ 1.77
Diluted earnings (loss) per common share (in dollars per share) $ 0.34 $ 1.29 $ 0.92 $ 1.76
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 (in shares) 800 3,300 800 2,900