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Leases (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2018
Leases [Abstract]
Remaining term lease	40 years
Renewal term	5 years
Operating Leases, Rent Expense, Net		$ 42,400,000

X

- Definition

Lessee, Operating Lease, Remaining Lease Term

+ References

No definition available.

+ Details

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Namespace Prefix:	iff_
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Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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- Definition

Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980

+ Details

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X

- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717

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