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Basis of Presentation and Significant Accounting Policies - Earnings per Common Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Numerator:                      
Net income (loss) attributable to World Fuel $ 29.6 $ 38.2 $ 28.7 $ 31.2 $ (193.1) $ (38.5) $ 30.0 $ 31.3 $ 127.7 $ (170.2) $ 126.5
Denominator:                      
Weighted average common shares for basic earnings per common share (in shares)                 67.4 68.1 69.3
Effect of dilutive securities (in shares)                 0.3 0.0 0.5
Weighted average common shares for diluted earnings per common share (in shares)                 67.7 68.1 69.8
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)                 1.2 1.4 1.3
Basic earnings (loss) per common share (in dollars per share) $ 0.44 $ 0.57 $ 0.42 $ 0.46 $ (2.86) $ (0.57) $ 0.44 $ 0.46 $ 1.89 $ (2.50) $ 1.82
Diluted earnings (loss) per common share (in dollars per share) $ 0.44 $ 0.56 $ 0.42 $ 0.46 $ (2.86) $ (0.57) $ 0.44 $ 0.45 $ 1.89 $ (2.50) $ 1.81