Consolidated Statements of Income and Comprehensive Income - USD ($) shares in Millions, $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Revenue	$ 9,459.4	$ 10,150.8	$ 18,138.2	$ 19,332.2
Cost of revenue	9,190.8	9,904.7	17,618.5	18,842.6
Gross profit	268.6	246.2	519.7	489.6
Operating expenses:
Compensation and employee benefits	113.9	110.2	224.0	224.1
General and administrative	79.5	74.9	150.1	147.2
Total operating expenses	193.4	185.1	374.1	371.3
Income from operations	75.2	61.1	145.6	118.3
Non-operating expenses, net:
Interest expense and other financing costs, net	(20.2)	(17.9)	(39.6)	(34.2)
Other income (expense), net	2.6	(1.6)	3.0	(3.9)
Total non-operating expenses, net	(17.6)	(19.5)	(36.6)	(38.1)
Income before income taxes	57.6	41.6	109.0	80.2
Provision for income taxes	20.0	12.4	34.0	19.7
Net income including noncontrolling interest	37.6	29.2	74.9	60.5
Net income attributable to noncontrolling interest	0.6	0.5	0.7	0.6
Net income attributable to World Fuel	$ 37.0	$ 28.7	$ 74.2	$ 59.9
Basic earnings per common share (in dollars per share)	$ 0.56	$ 0.42	$ 1.11	$ 0.89
Basic weighted average common shares (in shares)	66.7	67.7	66.9	67.6
Diluted earnings per common share (in dollars per share)	$ 0.55	$ 0.42	$ 1.10	$ 0.88
Diluted weighted average common shares (in shares)	67.0	68.0	67.2	67.9
Comprehensive income:
Net income including noncontrolling interest	$ 37.6	$ 29.2	$ 74.9	$ 60.5
Other comprehensive income (loss):
Foreign currency translation adjustments	(6.0)	(28.6)	(5.9)	(18.3)
Cash flow hedges, net of income tax benefit of $1.1 and net of income tax expense of $3.1 for the three months ended June 30, 2019 and 2018 respectively and net of income tax benefit of $5.2 and $1.1 for the six months ended June 30, 2019 and 2018, respectively	(2.9)	6.9	(14.7)	(2.8)
Other comprehensive income (loss)	(8.9)	(21.7)	(20.6)	(21.1)
Comprehensive income including noncontrolling interest	28.7	7.5	54.3	39.3
Comprehensive income (loss) attributable to noncontrolling interest	0.0	(1.1)	(0.7)	(1.3)
Comprehensive income attributable to World Fuel	$ 28.7	$ 8.6	$ 55.0	$ 40.7

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