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Summary Quarterly Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Summary of unaudited quarterly result
Revenue	$ 8,872.0	$ 8,543.0	$ 8,086.2	$ 8,194.3	$ 7,792.1	$ 7,399.8	$ 6,633.0	$ 5,190.8	$ 33,695.5	$ 27,015.8	$ 30,381.4
Gross profit	229.9	239.9	231.0	231.4	222.3	236.7	218.5	221.5	932.2	899.0	861.0
Net income (loss) including noncontrolling interest	(193.7)	(37.9)	30.3	31.1	2.1	43.0	29.8	51.6	(170.3)	126.4	170.5
Net income (loss) attributable to World Fuel	$ (193.1)	$ (38.5)	$ 30.0	$ 31.3	$ 2.2	$ 42.7	$ 30.0	$ 51.8	$ (170.2)	$ 126.5	$ 174.5
Basic earnings per common share (in dollars per share)	$ (2.86)	$ (0.57)	$ 0.44	$ 0.46	$ 0.03	$ 0.62	$ 0.43	$ 0.74	$ (2.50)	$ 1.82	$ 2.49
Diluted earnings per common share (in dollars per share)	$ (2.86)	$ (0.57)	$ 0.44	$ 0.45	$ 0.03	$ 0.61	$ 0.43	$ 0.74	$ (2.50)	$ 1.81	$ 2.47
Effective income tax rate reconciliation, valuation allowance on U.S. deferred tax assets		$ 76.9
Goodwill and other impairments	$ 91.9								$ 91.9	$ 0.0	$ 0.0
Cumulative loss period		3 years
Restructuring charges	$ 59.6								59.6	$ 0.0	$ 0.0
Transition tax toll charge on historic accumulated foreign earnings									$ 143.7

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