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Tangible Equity Units Tangible Equity - Settlement of Shares (Details) | Dec. 31, 2019 $ / shares
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Condition One [Member] |
Class of Stock [Line Items] |
Share Price | $ 159.54
Tangible Equity Rate, Settlement Rate | 0.3134
Condition Two [Member] |
Class of Stock [Line Items] |
Tangible Equity Units, Conditional Value | 50
Condition Three [Member] |
Class of Stock [Line Items] |
Share Price | 130.25
Tangible Equity Rate, Settlement Rate | 0.3839
Minimum [Member] | Condition Two [Member] |
Class of Stock [Line Items] |
Share Price | 130.25
Maximum [Member] | Condition Two [Member] |
Class of Stock [Line Items] |
Share Price | $ 159.54

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

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- Definition Tangible Equity Units, Conditional Value + References No definition available. + Details
Name: | iff_TangibleEquityUnitsConditionalValue
Namespace Prefix: | iff_
Data Type: | num: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 Price of a single share of a number of saleable stocks of a company. + References No definition available. + Details
Name: | us-gaap_SharePrice
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: |
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- Details
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Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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- Details
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Namespace Prefix: |
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