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Defined Benefit Plan, Amortization And Deferrals, Net Defined Benefit Plan, Amortization And Deferrals, Net Financial Instruments Financial Instruments Disclosure [Text Block] Construction in Progress Construction in Progress [Member] Inventories Increase (Decrease) in Inventories Address Type [Domain] Address Type [Domain] Other Other Components Of Other Nonoperating Income (Expense) Other Components Of Other Nonoperating Income (Expense) Expected contribution to the plan Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year Segment Reporting [Table] Segment Reporting [Table] Title and Position [Axis] Title and Position [Axis] Lease cost and other information Lease, Cost [Table Text Block] Prepaid expenses and other current assets Prepaid expenses and other current assets Other Assets, Current Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Amount of Gain (Loss) Recognized in Income on Derivative Settlements Derivative, Gain (Loss) on Derivative, Net Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Operating profit (loss) Operating Income (Loss) Current Fiscal Year End Date Current Fiscal Year End Date (Losses) gains on business divestitures Losses on Business Disposals Gain (Loss) on Disposition of Business Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Derivative [Line Items] Derivative [Line Items] Prepaid and Other Assets [Table] Prepaid and Other Assets [Table] Prepaid and Other Assets Greater Asia Asia [Member] Restructuring costs expected Restructuring and Related Cost, Expected Cost Treasury share repurchases Stock Repurchased During Period, Shares 2026 Euro Notes Senior Notes, Euro Notes, Due Two Thousand Twenty Six [Member] Senior Notes, Euro Notes, Due Two Thousand Twenty Six [Member] Restructuring Reserve [Roll Forward] Restructuring Reserve [Roll Forward] Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Dividends declared per share (in dollars per share) Dividends declared per share, in dollars per share Common Stock, Dividends, Per Share, Declared Entity File Number Entity File Number Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Service cost for benefits earned Defined Benefit Plan, Service Cost Amount of Gain (Loss) Reclassified from AOCI into Income (Effective Portion), Cash Flow Hedge Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax Net sales attributed to all foreign countries All Foreign Countries [Member] All Foreign Countries [Member] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Restructuring costs incurred Restructuring Costs Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Common stock, shares issued Common Stock, Shares, Issued Measure: Measure [Axis] Entity Information [Line Items] Entity Information [Line Items] Treasury stock (in shares) Treasury stock, beginning balance (in shares) Treasury stock, ending balance (in shares) Treasury Stock, Common, Shares Foreign currency contracts Forward Contracts [Member] Receivables factored Proceeds From Sale Of Accounts Receivable Proceeds From Sale Of Accounts Receivable Equity Components [Axis] Equity Components [Axis] Trade receivables Increase (Decrease) in Accounts Receivable Deferred compensation arrangement with individual, compensation expense Deferred Compensation Arrangement with Individual, Compensation Expense Entity Interactive Data Current Entity Interactive Data Current Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] Net income attributable to non-controlling interests Net Income (Loss) Attributable to Noncontrolling Interest Deferred income taxes Deferred Income Tax Liabilities, Net Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Entity Small Business Entity Small Business Comprehensive income (loss) attributable to IFF shareholders Comprehensive Income (Loss), Net of Tax, Attributable to Parent Termination Date Trading Arrangement Termination Date Property, Plant, and Equipment [Line Items] Property, Plant, and Equipment [Line Items] 2027 Notes Senior Notes, Due Two Thousand Twenty Seven [Member] Senior Notes, Due Two Thousand Twenty Seven BUSINESS DIVESTITURES AND ASSETS AND LIABILITIES HELD FOR SALE Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] 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Investment Hedging Net Investment Hedging [Member] Income (loss) before taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Deferred income taxes Deferred Income Taxes and Other Assets, Noncurrent Commitments and Contingencies Commitments and Contingencies Total carrying value Intangible Asset, Finite-Lived, before Accumulated Amortization Property, plant and equipment, at cost Property, Plant, and Equipment, before Accumulated Depreciation, Depletion, and Amortization Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Axis] 2030 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Four New Accounting Pronouncements or Change in Accounting Principle [Table] Accounting Standards Update and Change in Accounting Principle [Table] Other Assets [Abstract] Other Assets [Abstract] Machinery and Equipment Machinery and Equipment [Member] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Executive Category: Executive Category [Axis] 2030 Notes Senior Notes, Due Two Thousand Thirty [Member] Senior Notes, Due Two Thousand Thirty Receivable Type [Axis] Receivable Type [Axis] Amount of Gain (Loss) Recognized in OCI on Derivative and Non-Derivative (Effective Portion), Tax (expense) benefit Other Comprehensive Income (Loss), Tax Goodwill [Roll Forward] Goodwill [Roll Forward] LIABILITIES AND SHAREHOLDERS’ EQUITY Liabilities and Equity [Abstract] Other Commitments [Table] Other Commitments [Table] Earnout and other post-closing adjustments receivable Earnout Receivable, Current Earnout Receivable, Current Intangible Asset, Finite-Lived, Class [Domain] Intangible Asset, Finite-Lived, Class [Domain] 2025 Share Repurchase Program 2025 Share Repurchase Program [Member] 2025 Share Repurchase Program Carrying Amount and Estimated Fair Values of Financial Instruments Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Inventory, Net Inventory, Net Award Type [Domain] Award Type [Domain] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount 1.800% Senior Notes due 2026 1.800% Senior Notes Due 2026 [Member] 1.800% Senior Notes Due 2026 [Member] Supplemental Disclosures: Supplemental Cash Flow Information [Abstract] 2027 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year One Treasury stock acquired (in shares) Treasury Stock, Shares, Acquired 2048 Notes Senior Notes, Due Two Thousand Forty Eight [Member] Senior Notes, Due Two Thousand Forty Eight [Member] PEO Name PEO Name Geographical [Axis] Geographical [Axis] Share Equivalents Share Equivalents [Member] Share Equivalents Bank guarantees, commercial guarantees, standby letters of credit and surety bonds, facility amounts Bank Guarantees, Commercial Guarantees, Standby Letters Of Credit And Surety Bonds, Facility Amounts Bank Guarantees, Commercial Guarantees, Standby Letters Of Credit And Surety Bonds, Facility Amounts Number of new reportable segments Number Of New Reportable Segments Number Of New Reportable Segments Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Trade Accounts Receivable With The Company's Own Factoring Agreements Trade Accounts Receivable With The Company's Own Factoring Agreements [Member] Trade Accounts Receivable With Factoring Agreements [Member] Income taxes paid, net Income Tax Paid, before Refund Received Property, Plant and Equipment, Type [Axis] Long-Lived Asset, Class [Axis] Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Legal Entity [Axis] Legal Entity [Axis] Accounts Receivable, Allowance for Credit Loss [Roll Forward] Accounts Receivable, Allowance for Credit Loss [Roll Forward] Hedged liability, debt Hedged Liability, Fair Value Hedge Liability Class [Axis] Liability Class [Axis] Other Commitments [Line Items] Other Commitments [Line Items] Less: Tax benefit Share-Based Payment Arrangement, Expense, Tax Benefit Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Treasury stock acquired Treasury Stock, Value, Acquired, Cost Method Cash Payments Payments for Restructuring Cash and cash equivalents at beginning of year Cash and cash equivalents at end of period Cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Intangible Asset, Finite-Lived [Table] Intangible Asset, Finite-Lived [Table] Accounts payable Increase (Decrease) in Accounts Payable Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Reclassifications of Accumulated Other Comprehensive Income to Consolidated Statement of Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Nature of Operations and Summary of Significant Accounting Policies Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Debt Instrument [Axis] Debt Instrument [Axis] Reporting Unit [Domain] Reporting Unit [Domain] Stock-based compensation Share-Based Payment Arrangement, Noncash Expense 2028 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Two Total operating lease cost Lease, Cost Schedule Of Reclassification Of Accumulated Other Comprehensive Income Loss [Line Items] Schedule Of Reclassification Of Accumulated Other Comprehensive Income Loss [Line Items] Schedule Of Reclassification Of Accumulated Other Comprehensive Income Loss [Line Items] Expected Credit Loss Credit Loss, Financial Instrument [Policy Text Block] Disposal Group Name [Axis] Disposal Group Name [Axis] Components of Debt Schedule of Debt [Table Text Block] Schedule of Inventory, Current Schedule of Inventory, Current [Table Text Block] Leases Lessee, Operating Leases [Text Block] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Derivative Instruments Measured at Fair Value Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Net income per share - basic (in dollars per share) Earnings Per Share, Basic Payments for Repurchase of Common Stock Payments for Repurchase of Common Stock Total Current Assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Accounts Receivable, Held-for-sale Accounts Receivable, Held-for-Sale Long-term debt Total Long-term debt Long-Term Debt, Excluding Current Maturities Award Type [Axis] Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Bank Guarantees, Commercial Guarantees, Standby Letters Of Credit and Surety Bonds Bank Guarantees, Commercial Guarantees, Standby Letters Of Credit And Surety Bonds [Member] Bank Guarantees, Commercial Guarantees, Standby Letters Of Credit And Surety Bonds Accumulated deficit Retained Earnings (Accumulated Deficit) Commodity contracts Commodity Contract [Member] Repayments of commercial paper Repayments of Commercial Paper Restructuring and Related Activities [Abstract] Restructuring and Related Activities [Abstract] Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Number of foreign currency derivatives held Number of Foreign Currency Derivatives Held Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Pension Plans Pension Plan [Member] Common Stock, par value 12 1/2¢ per share Common stock Common Stock [Member] Gain (loss) on disposition of business Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal Fair Value Measurement [Domain] Fair Value Measurement [Domain] Operating lease cost Operating Lease, Cost Employee Severance Employee Severance [Member] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Cover [Abstract] Other comprehensive income (loss), derivative, excluded component, increase (decrease), before adjustments, tax Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments, Tax Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations Disposal Group, Held-for-Sale or Disposed of by Sale, Not Discontinued Operations [Member] Derivative Contract Type [Domain] Derivative Contract [Domain] Maximum percentage of total consolidated net sales attributed to any non-U.S. country Concentration Risk, Percentage Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Loans payable Loans Payable [Member] Accounts Receivable Receivable [Policy Text Block] Foreign exchange Goodwill, Foreign Currency Translation, Gain (Loss) Equity Awards Adjustments Equity Awards Adjustments [Member] Hedging Relationship [Domain] Hedging Relationship [Domain] Total Liabilities and Shareholders’ Equity Liabilities and Equity Variable lease cost Variable Lease, Cost Share-based arrangement, accelerated cost Share-Based Payment Arrangement, Accelerated Cost Employee Stock Option Share-Based Payment Arrangement, Option [Member] The amount of pledged assets, principally PP&E to cover income tax and indirect tax assessments Amount Of Pledged Assets Principally Property, Plant And Equipment To Cover Income Tax And Indirect Tax Assessments The amount of pledged assets, principally property, plant and equipment to cover income tax and indirect tax assessments. Short-term debt and current portion of long-term debt Debt, Current Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Table] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Table] Non-controlling interests Equity, Attributable to Noncontrolling Interest Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Restructuring and other charges Additional charges, net Restructuring and other charges Restructuring Charges Tabular List, Table Tabular List [Table Text Block] Loss contingency accrual, provision Loss Contingency Accrual, Loss (Reversal of Loss) Value-added tax payable Sales and Excise Tax Payable, Current Stock-Based Compensation Expense and Related Tax Benefits Share-Based Payment Arrangement, Cost by Plan [Table Text Block] Other expense, net Other Expense, net Other (expense) income, net Other Nonoperating Income (Expense) 2029 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Three Prepaid income taxes Income Taxes Receivable, Current 2026 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Remainder of Fiscal Year Name Awards Close in Time to MNPI Disclosures, Individual Name Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Other Current Liabilities Other Current Liabilities [Table Text Block] Property, Plant and Equipment, Type [Domain] Long-Lived Asset, Class [Domain] Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Stock options and restricted stock awards Employee Stock Option And Restricted Stock [Member] Employee Stock Option And Restricted Stock [Member] Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) [Text Block] Accumulated Other Comprehensive Income (Loss) [Text Block] Receivables, Net, Current Trade receivables Receivables, Net, Current Property, Plant, and Equipment [Table] Property, Plant, and Equipment [Table] Adjustment to Compensation: Adjustment to Compensation [Axis] Pharma Solutions Pharma Solutions [Member] Pharma Solutions Total Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Hedging Designation [Domain] Hedging Designation [Domain] Share Repurchase Program [Axis] Share Repurchase Program [Axis] Class of Stock [Domain] Class of Stock [Domain] Restructuring Cost and Reserve [Line Items] Restructuring Cost and Reserve [Line Items] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Interest paid, net of amounts capitalized Interest Paid, Excluding Capitalized Interest, Operating Activity Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Foreign Exchange Forward Foreign Exchange Forward [Member] Hedging Designation [Axis] Hedging Designation [Axis] Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Credit Facility [Axis] Credit Facility [Axis] Restructuring and Other Charges, Net Restructuring and Related Activities Disclosure [Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Discontinued Operations and Disposal Groups [Abstract] Name Measure Name Income Taxes Income Tax Disclosure [Text Block] Non-Cash Charges Restructuring Reserve, Settled without Cash Accounts payable Accounts Payable, Current Pay vs Performance Disclosure [Line Items] Debt Instrument [Line Items] Debt Instrument [Line Items] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Capital in excess of par value Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Impairment of goodwill Impairment of goodwill Impairment Goodwill, Impairment Loss Name Trading Arrangement, Individual Name Cross currency swaps Currency Swap [Member] Cash and cash equivalents Cash and Cash Equivalent Retirement Plan Sponsor Location [Axis] Retirement Plan Sponsor Location [Axis] Raw materials Inventory, Raw Materials, Net of Reserves Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Company Selected Measure Amount Company Selected Measure Amount Fair Value of Derivatives Not Designated as Hedging Instruments Not Designated as Hedging Instrument Not Designated as Hedging Instrument [Member] Depreciation and amortization Depreciation, Depletion and Amortization Retirement Plan Sponsor Location [Domain] Retirement Plan Sponsor Location [Domain] Net income (loss) Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Current Assets: Assets, Current [Abstract] Derivative Liability Derivative Liability Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Right-of-Use Asset Obtained in Exchange for Operating Lease Liability North America North America [Member] Provision for income taxes Tax Income Tax Expense (Benefit) Foreign exchange (losses) gains Gain (Loss), Foreign Currency Transaction, before Tax Latin America Latin America [Member] Schedule Of Information By Major Category Of Credit Derivatives Contracts [Table] Schedule Of Information By Major Category Of Credit Derivatives Contracts [Table] Schedule Of Information By Major Category Of Credit Derivatives Contracts [Table] Customer Concentration Risk Customer Concentration Risk [Member] Net loss Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest Cost of sales Cost of sales Foreign currency contracts Cost of Product and Service Sold Technological know-how Technology-Based Intangible Assets [Member] Award Timing Method Award Timing Method [Text Block] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Net change in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Other costs Other (Costs) Credits Other (Costs) Credits Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Other intangible assets, net Other Intangible Assets, Net Net income (loss) attributable to IFF shareholders Net income (loss) available to IFF shareholders Net Income (Loss) Attributable to Parent Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Statement [Table] Statement [Table] Restatement Determination Date: Restatement Determination Date [Axis] Schedule of Changes in Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Interest income Investment Income, Interest Income tax expense (benefit) from gain (loss) on disposal Disposal Group, Not Discontinued Operation, Income Tax Expense (Benefit) From Gain (Loss) On Disposal Disposal Group, Not Discontinued Operation, Income Tax (Benefit) Expense From Gain (Loss) On Divestiture Prepaid and Other Assets [Line Items] Prepaid and Other Assets [Line Items] Prepaid and Other Assets Fair value of derivative assets Derivative Asset, Subject to Master Netting Arrangement, before Offset Schedule of Other Assets Schedule of Other Assets [Table Text Block] Amount of Gain (Loss) Recognized in OCI on Derivative and Non-Derivative (Effective Portion), Net Investment Hedge Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), before Reclassification and Tax Disposal Group, Including Discontinued Operation, Other Liabilities Other liabilities Disposal Group, Including Discontinued Operation, Other Liabilities Amount of Gain (Loss) Recognized in Income on Changes in Fair Value Fair Value, Option, Changes in Fair Value, Gain (Loss) Percentage of outstanding receivables by over 365 days Accounts Receivables, Outstanding By Over 365 Days Accounts Receivables, Outstanding By Over 365 Days Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract]