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Earnings per Common Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Numerator:
Net income attributable to World Fuel	$ 55.6us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 50.7us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Denominator:
Weighted average common shares for basic earnings per common share	70.7us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	70.7us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities (in shares)	0.7us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	0.7us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Weighted average common shares for diluted earnings per common share	71.4us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	71.4us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Weighted average securities which are not included in the calculation of diluted earnings per common share (in shares)	0.9us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0.5us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Basic earnings per common share (in dollars per share)	$ 0.79us-gaap_EarningsPerShareBasic	$ 0.72us-gaap_EarningsPerShareBasic
Diluted earnings per common share (in dollars per share)	$ 0.78us-gaap_EarningsPerShareDiluted	$ 0.71us-gaap_EarningsPerShareDiluted

X

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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