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Earnings per Common Share (Details) (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Numerator:
Net income attributable to World Fuel (in dollars)	$ 52,655	$ 36,755	$ 143,967	$ 107,435
Denominator:
Weighted average common shares for basic earnings per common share	70,939	60,496	70,593	59,768
Effect of dilutive securities (in shares)	648	1,167	822	1,217
Weighted average common shares for diluted earnings per common share	71,587	61,663	71,415	60,985
Weighted average anti-dilutive securities which are not included in the calculation of diluted earnings per common share (in shares)	119	222	85	268
Basic earnings per common share (in dollars per share)	$ 0.74	$ 0.61	$ 2.04	$ 1.80
Diluted earnings per share (in dollars per share)	$ 0.74	$ 0.60	$ 2.02	$ 1.76

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