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Acquisitions and Divestitures - Unaudited Pro Forma Results (Details) - Acquisitions 2016 and 2015 - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Revenue	$ 27,925.0	$ 32,604.4
Net income attributable to World Fuel	$ 146.1	$ 202.0
Earnings per common share:
Basic (in dollars per share)	$ 2.11	$ 2.88
Diluted (in dollars per share)	$ 2.09	$ 2.86

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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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-Publisher FASB
-Name Accounting Standards Codification
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