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Tangible Equity Units Tangible Equity - Settlement of Shares (Details) - $ / shares | Sep. 15, 2021 | Sep. 14, 2021
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Class of Stock [Line Items] |  |
Stock Issued During Period, Shares, Issued for Services | 5,460,031 |
Tangible Equity Units Final Settlement Rate |  | $ 0.330911

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- Definition Tangible Equity Units Final Settlement Rate + References No definition available. + Details
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Namespace Prefix: | iff_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of shares issued in lieu of cash for services contributed to the entity. Number of shares includes, but is not limited to, shares issued for services contributed by vendors and founders. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration