Condensed Consolidated Statements of Income and Comprehensive Income - USD ($) shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Revenue	$ 8,350.9	$ 4,482.7	$ 21,394.2	$ 15,656.2
Cost of revenue	8,153.4	4,268.7	20,821.3	14,969.6
Gross profit	197.5	214.0	573.0	686.6
Operating expenses:
Compensation and employee benefits	93.5	91.4	273.9	289.8
General and administrative	60.6	80.9	177.4	249.1
Asset impairments	0.0	0.0	4.7	18.6
Restructuring charges	1.7	2.9	6.8	7.7
Total operating expenses	155.8	175.2	462.7	565.1
Income from operations	41.7	38.8	110.2	121.5
Non-operating income (expenses), net:
Interest expense and other financing costs, net	(10.4)	(8.7)	(29.2)	(34.1)
Other income (expense), net	1.0	77.7	(1.6)	75.0
Total non-operating income (expense), net	(9.4)	69.0	(30.7)	41.0
Income (loss) before income taxes	32.3	107.8	79.5	162.4
Provision for income taxes	10.0	25.4	20.8	49.0
Net income (loss) including noncontrolling interest	22.3	82.4	58.7	113.4
Net income (loss) attributable to noncontrolling interest	0.6	0.5	0.5	0.2
Net income (loss) attributable to World Fuel	$ 21.7	$ 82.0	$ 58.2	$ 113.1
Basic earnings (loss) per common share (in dollars per share)	$ 0.34	$ 1.29	$ 0.92	$ 1.77
Basic weighted average common shares (in shares)	63,000	63,400	63,100	63,900
Diluted earnings (loss) per common share (in dollars per share)	$ 0.34	$ 1.29	$ 0.92	$ 1.76
Diluted weighted average common shares (in shares)	63,300	63,600	63,600	64,100
Comprehensive income:
Net income (loss) including noncontrolling interest	$ 22.3	$ 82.4	$ 58.7	$ 113.4
Other comprehensive income (loss):
Foreign currency translation adjustments	(11.3)	15.1	(10.6)	(12.9)
Cash flow hedges, net of income tax expense (benefit) of $(2.8) and $2.1 for the three months ended September 30, 2021 and 2020, respectively, and net of income tax expense (benefit) of $(0.2) and $2.3 for the nine months ended September 30, 2021 and 2020, respectively	(8.2)	6.1	(0.5)	6.8
Total other comprehensive income (loss)	(19.5)	21.2	(11.0)	(6.0)
Comprehensive income (loss) including noncontrolling interest	2.8	103.6	47.7	107.3
Comprehensive income (loss) attributable to noncontrolling interest	0.6	0.0	0.5	0.0
Comprehensive income (loss) attributable to World Fuel	$ 2.2	$ 103.6	$ 47.2	$ 107.3