Consolidated Statements of Income and Comprehensive Income - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Revenue	$ 36,819.0	$ 39,750.3	$ 33,695.5
Cost of revenue	35,707.0	38,731.8	32,763.3
Gross profit	1,112.0	1,018.5	932.2
Operating expenses:
Compensation and employee benefits	470.4	442.1	428.2
General and administrative	322.2	299.6	306.9
Goodwill & Other Impairments	0.0	0.0	91.9
Restructuring charges	19.7	17.1	59.6
Total operating expenses	812.3	758.8	886.6
Income from operations	299.7	259.7	45.6
Non-operating expenses, net:
Interest expense and other financing costs, net	(73.9)	(71.0)	(60.3)
Other income (expense), net	11.5	(3.8)	(6.4)
Total non-operating expenses, net	(62.4)	(74.8)	(66.7)
Income (loss) before income taxes	237.3	184.9	(21.1)
Provision for income taxes	56.2	55.9	149.2
Net income (loss) including noncontrolling interest	181.1	129.0	(170.3)
Net income (loss) attributable to noncontrolling interest	2.2	1.3	(0.1)
Net income (loss) attributable to World Fuel	$ 178.9	$ 127.7	$ (170.2)
Basic earnings per common share (in dollars per share)	$ 2.71	$ 1.89	$ (2.50)
Basic weighted average common shares (in shares)	66.1	67.4	68.1
Diluted earnings per common share (in dollars per share)	$ 2.69	$ 1.89	$ (2.50)
Diluted weighted average common shares (in shares)	66.5	67.7	68.1
Comprehensive income:
Net income (loss) including noncontrolling interest	$ 181.1	$ 129.0	$ (170.3)
Other comprehensive income (loss):
Foreign currency translation adjustments	8.2	(27.3)	30.1
Cash flow hedges, net of income tax benefit of $8.7, expense of $7.0, and benefit of $0.3 for 2019, 2018, and 2017, respectively	(25.5)	21.0
Cash flow hedges, net of income tax benefit of $8.7, expense of $7.0, and benefit of $0.3 for 2019, 2018, and 2017, respectively			(0.3)
Other comprehensive income (loss):	(17.3)	(6.3)	29.8
Comprehensive income (loss) including noncontrolling interest	163.7	122.6	(140.5)
Comprehensive income (loss) attributable to noncontrolling interest	(2.7)	(1.2)	1.5
Comprehensive income (loss) attributable to World Fuel	$ 166.5	$ 123.8	$ (142.0)