Consolidated Statements of Income and Comprehensive Income - USD ($) shares in Millions, $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Revenue	$ 9,322.7	$ 10,429.5	$ 27,460.9	$ 29,761.7
Cost of revenue	9,017.0	10,162.8	26,635.6	29,005.4
Gross profit	305.7	266.7	825.3	756.3
Operating expenses:
Compensation and employee benefits	129.2	117.9	353.3	342.0
General and administrative	82.8	70.6	232.9	217.8
Total operating expenses	212.0	188.5	586.2	559.8
Income from operations	93.6	78.2	239.2	196.4
Non-operating expenses, net:
Interest expense and other financing costs, net	(19.5)	(18.3)	(59.1)	(52.5)
Other income (expense), net	(3.3)	1.9	(0.3)	(2.0)
Total non-operating expenses, net	(22.8)	(16.4)	(59.4)	(54.5)
Income before income taxes	70.9	61.8	179.8	142.0
Provision for income taxes	21.5	23.0	55.5	42.7
Net income including noncontrolling interest	49.4	38.7	124.3	99.2
Net income attributable to noncontrolling interest	1.2	0.6	1.9	1.1
Net income attributable to World Fuel	$ 48.2	$ 38.2	$ 122.4	$ 98.1
Basic earnings per common share (in dollars per share)	$ 0.74	$ 0.57	$ 1.84	$ 1.45
Basic weighted average common shares (in shares)	65.3	67.5	66.4	67.5
Diluted earnings per common share (in dollars per share)	$ 0.73	$ 0.56	$ 1.84	$ 1.45
Diluted weighted average common shares (in shares)	65.7	67.7	66.7	67.8
Comprehensive income:
Net income including noncontrolling interest	$ 49.4	$ 38.7	$ 124.3	$ 99.2
Other comprehensive loss:
Foreign currency translation adjustments	(11.5)	(4.7)	(17.4)	(23.0)
Cash flow hedges, net of income tax expense of $2.8 and income tax benefit of $3.5 for the three months ended September 30, 2019 and 2018 respectively and net of income tax benefit of $2.4 and $5.2 for the nine months ended September 30, 2019 and 2018, respectively	7.9	(5.6)	(6.8)	(8.4)
Other comprehensive loss	(3.6)	(10.3)	(24.2)	(31.4)
Comprehensive income including noncontrolling interest	45.8	28.5	100.1	67.8
Comprehensive income (loss) attributable to noncontrolling interest	(0.8)	0.1	(1.5)	(1.2)
Comprehensive income attributable to World Fuel	$ 46.6	$ 28.4	$ 101.6	$ 69.1

Represents the amount of interest income and expense, net, which includes other financing costs.

No definition available.

Name:	int_InterestIncomeExpenseAndOtherFinancialCostsNet
Namespace Prefix:	int_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e557-108580

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 1B
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669625-108580

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 1A
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669619-108580