Consolidated Statements of Income and Comprehensive Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Revenue	$ 8,543.0	$ 7,399.8	$ 24,823.4	$ 19,223.6
Cost of revenue	8,303.1	7,163.1	24,121.1	18,546.9
Gross profit	239.9	236.7	702.3	676.7
Operating expenses:
Compensation and employee benefits	107.6	106.6	314.5	306.2
Provision for bad debt	2.4	1.5	6.3	5.4
General and administrative	68.6	70.3	218.7	200.2
Total operating expenses	178.6	178.4	539.5	511.9
Income from operations	61.3	58.2	162.8	164.8
Non-operating expenses, net:
Interest expense and other financing costs, net	(15.8)	(10.3)	(42.2)	(26.0)
Other income (expense), net	(0.9)	0.5	(5.0)	1.2
Total non-operating expenses, net	(16.7)	(9.8)	(47.3)	(24.8)
Income before income taxes	44.6	48.4	115.6	140.1
Provision for income taxes	82.6	5.4	92.2	15.7
Net income (loss) including noncontrolling interest	(37.9)	43.0	23.4	124.4
Net income attributable to noncontrolling interest	0.6	0.3	0.6	0.1
Net income (loss) attributable to World Fuel	$ (38.5)	$ 42.7	$ 22.8	$ 124.3
Basic earnings per common share (in dollars per share)	$ (0.57)	$ 0.62	$ 0.33	$ 1.79
Basic weighted average common shares (in shares)	67.9	69.1	68.3	69.4
Diluted earnings per common share (in dollars per share)	$ (0.57)	$ 0.61	$ 0.33	$ 1.78
Diluted weighted average common shares (in shares)	68.2	69.5	68.6	69.9
Comprehensive income:
Net income (loss) including noncontrolling interest	$ (37.9)	$ 43.0	$ 23.4	$ 124.4
Other comprehensive income (loss):
Foreign currency translation adjustments	12.2	(14.6)	29.8	(27.9)
Cash Flow hedges, net of income tax benefit of $5.5 and income tax expense of $1.1 for the three and nine months ended September 30, 2017, respectively	(8.7)	(7.7)	1.8	(2.8)
Other comprehensive income (loss)	3.5	(22.4)	31.6	(30.7)
Comprehensive income (loss) including noncontrolling interest	(34.4)	20.7	55.0	93.7
Comprehensive income attributable to noncontrolling interest	1.1	1.4	2.2	1.9
Comprehensive income (loss) attributable to World Fuel	$ (35.5)	$ 19.3	$ 52.8	$ 91.9