Consolidated Statements of Income and Comprehensive Income - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Revenue	$ 9,181.3	$ 8,194.3
Cost of revenue	8,937.9	7,962.9
Gross profit	243.4	231.4
Operating expenses:
Compensation and employee benefits	113.9	104.5
General and administrative	72.3	76.6
Total operating expenses	186.2	181.1
Income from operations	57.2	50.3
Non-operating expenses, net:
Interest expense and other financing costs, net	(16.3)	(12.7)
Other expense, net	(2.3)	(1.6)
Total non-operating expenses, net	(18.6)	(14.3)
Income before income taxes	38.6	36.1
Provision for income taxes	7.3	5.0
Net income including noncontrolling interest	31.3	31.1
Net income (loss) attributable to noncontrolling interest	0.1	(0.3)
Net income attributable to World Fuel	$ 31.2	$ 31.3
Basic earnings per common share (in dollars per share)	$ 0.46	$ 0.46
Basic weighted average common shares (in shares)	67.5	68.7
Diluted earnings per common share (in dollars per share)	$ 0.46	$ 0.45
Diluted weighted average common shares (in shares)	67.9	69.2
Comprehensive income:
Net income including noncontrolling interest	$ 31.3	$ 31.1
Other comprehensive income (loss):
Foreign currency translation adjustments	10.2	6.4
Cash flow hedges, net of income tax benefit of $4.2 and income tax expense of $6.5 for the three months ended March 31, 2018 and 2017, respectively	(9.7)	10.5
Other comprehensive income	0.5	16.9
Comprehensive income including noncontrolling interest	31.8	48.0
Comprehensive loss attributable to noncontrolling interest	(0.3)	(0.1)
Comprehensive income attributable to World Fuel	$ 32.1	$ 48.0