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Earnings per Common Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Numerator:                      
Net income (loss) attributable to World Fuel                 $ 109.6 $ 178.9 $ 127.7
Denominator:                      
Weighted average common shares for basic earnings per common share (in shares)                 63.7 66.1 67.4
Effect of dilutive securities (in shares)                 0.3 0.4 0.3
Weighted average common shares for diluted earnings per common share (in shares)                 64.0 66.5 67.7
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)                 3.0 1.4 1.2
Basic earnings per common share (in dollars per share) $ (0.06) $ 1.29 $ (0.16) $ 0.64 $ 0.86 $ 0.74 $ 0.56 $ 0.55 $ 1.72 $ 2.71 $ 1.89
Diluted earnings per common share (in dollars per share) $ (0.06) $ 1.29 $ (0.16) $ 0.63 $ 0.86 $ 0.73 $ 0.55 $ 0.55 $ 1.71 $ 2.69 $ 1.89