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Summary Quarterly Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ 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
Summary of unaudited quarterly result
Revenue	$ 6,731.9	$ 7,810.7	$ 8,496.4	$ 7,340.7	$ 9,779.5	$ 11,713.4	$ 11,342.5	$ 10,550.9	$ 30,379.7	$ 43,386.4	$ 41,561.9
Gross profit	228.0	226.7	190.4	215.4	219.5	214.6	191.5	188.0	860.5	813.6	752.8
Net income including noncontrolling interest	51.4	48.6	28.4	54.6	67.1	54.4	46.3	50.5	183.0	218.4	207.2
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
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
Gain on sale of crude oil joint venture interest, net of tax and related operating expenses					$ 9.9
Gain on sale of joint venture interests, net of tax and related operating expenses, impact on basic and diluted earnings per share (in dollars per share)					$ 0.14
Employment Agreement
Summary of unaudited quarterly result
Severance termination charge, net of tax									$ 2.3
Severance termination charge, impact on basic and diluted earnings per share (in dollars per share)									$ 0.03
Executive Non-Renewal
Summary of unaudited quarterly result
Severance termination charge, net of tax							$ 3.0
Severance termination charge, impact on basic and diluted earnings per share (in dollars per share)							$ 0.04

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