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Earnings per Common Share (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Jan. 03, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Numerator:        
Net income (loss) attributable to World Fuel   $ 73.7 $ 109.6 $ 178.9
Denominator:        
Weighted average common shares for basic earnings per common share (in shares)   62,900,000 63,700,000 66,100,000
Effect of dilutive securities (in shares)   400,000 300,000 400,000
Weighted average common shares for diluted earnings per common share (in shares)   63,300,000 64,000,000.0 66,500,000
Basic earnings (loss) per common share (in dollars per share)   $ 1.17 $ 1.72 $ 2.71
Diluted earnings (loss) per common share (in dollars per share)   $ 1.16 $ 1.71 $ 2.69
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)   1,500,000 3,000,000.0 1,400,000
Flyers Energy Group | Subsequent Event        
Denominator:        
Common stock issued (in shares) 1,768,034