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v3.20.1

Subsequent Events (Details) - Unsecured Debt [Member] - Subsequent Event [Member] | Jan. 17, 2020
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Maximum [Member] | Three Hundred Sixty Four Day Senior Unsecured Bridge Facility [Member] |
Subsequent Event [Line Items] |
Maximum ratio of net debt to EBI TDA with step-downs over time | 4.50
Maximum [Member] | Senior Unsecured Term Loan Facilities [Member] |
Subsequent Event [Line Items] |
Maximum ratio of net debt to EBI TDA with step-downs over time | 4.50
Minimum [Member] | Three Hundred Sixty Four Day Senior Unsecured Bridge Facility [Member] |
Subsequent Event [Line Items] |
Maximum ratio of net debt to EBI TDA with step-downs over time | 3.50
Minimum [Member] | Senior Unsecured Term Loan Facilities [Member] |
Subsequent Event [Line Items] |
Maximum ratio of net debt to EBI TDA with step-downs over time | 3.50

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- Definition Debt Instrument, Covenant Compliance, Ratio Of Net Debt To EBITDA With Step-Downs Over Time + References No definition available. + Details
Name: | iff_DebtInstrumentCovenantComplianceRatioOfNetDebtToEBITDAWithStepDownsOverTime
Namespace Prefix: | iff_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_UnsecuredDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DebtInstrumentAxis=iff_ThreeHundredSixtyFourDaySeniorUnsecuredBridgeFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DebtInstrumentAxis=iff_SeniorUnsecuredTermLoanFacilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |