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Nature of Business, Acquisitions, Significant Accounting Policies and Recent Accounting Pronouncements - Policies (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Numerator:                      
Net income attributable to World Fuel $ 51.8 $ 49.6 $ 29.9 $ 55.6 $ 67.1 $ 55.6 $ 48.2 $ 50.7 $ 186.9 $ 221.7 $ 203.1
Denominator:                      
Weighted average common shares for basic earnings per common share                 70.2 70.8 71.2
Effect of dilutive securities (in shares)                 0.5 0.5 0.6
Weighted average common shares for diluted earnings per common share                 70.7 71.3 71.8
Weighted average securities which are not included in the calculation of diluted earnings per common share (in shares)                 1.0 0.9 0.6
Basic earnings per common share (in dollars per share) $ 0.75 $ 0.71 $ 0.42 $ 0.79 $ 0.95 $ 0.79 $ 0.68 $ 0.72 $ 2.66 $ 3.13 $ 2.85
Diluted earnings per common share (in dollars per share) $ 0.74 $ 0.71 $ 0.42 $ 0.78 $ 0.94 $ 0.78 $ 0.68 $ 0.71 $ 2.64 $ 3.11 $ 2.83