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Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Net Income (Loss) Attributable to Parent [Abstract]        
Net income (loss) attributable to World Kinect $ (339.4) $ 108.3 $ (360.4) $ 135.7
Weighted Average Number of Shares Outstanding, Diluted [Abstract]        
Weighted average common shares for basic earnings per common share 56.0 59.8 56.5 59.9
Effect of dilutive securities 0.0 0.2 0.0 0.4
Weighted average common shares for diluted earnings per common share 56.0 60.0 56.5 60.3
Basic earnings (loss) per common share $ (6.06) $ 1.81 $ (6.38) $ 2.27
Diluted earnings (loss) per common share $ (6.06) $ 1.81 $ (6.38) $ 2.25
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 1.6 1.3 1.6 1.2