Leases [Abstract] Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] North America North America [Member] Europe, Africa and Middle East EMEA [Member] Greater Asia Asia [Member] Latin America Latin America [Member] Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Consolidated Operating Lease, Right-of-Use Asset Segment Reporting [Abstract] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Nonrecurring Adjustment [Axis] Nonrecurring Adjustment [Axis] Nonrecurring Adjustment [Domain] Nonrecurring Adjustment [Domain] Acquisition-related Costs Acquisition-related Costs [Member] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Operating Segments Operating Segments [Member] Corporate, Non-Segment Corporate, Non-Segment [Member] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Frutarom Frutarom Industries Ltd. [Member] Frutarom Industries Ltd. [Member] Business Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Taste Flavors [Member] Flavors Scent Fragrances [Member] Fragrances. Corporate and Other Corporate and Other [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Net sales: Revenues [Abstract] Net sales Revenue from Contract with Customer, Excluding Assessed Tax Segment profit: Segment Reporting Information, Profit (Loss) [Abstract] Operational improvement initiative costs Operational Improvement Initiative Costs Operational Improvement Initiative Costs Acquisition and related costs Business Combination, Acquisition Related Costs Integration-related costs Business Combination, Integration Related Costs Restructuring and other charges, net Restructuring Charges Gain on sales of fixed assets Gain (Loss) on Disposition of Property Plant Equipment Operating profit Operating Income (Loss) Frutarom Acquisition Related Costs Pension Cost (Reversal of Cost) Interest expense Interest Expense Other income (expense) Other Nonoperating Income (Expense) Income before taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Amortization Amortization Transaction costs Business Acquisition, Transaction Costs Adjustments to contingent consideration Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability Less than 1 Year Operating Leases, Future Minimum Payments Due, Next Twelve Months 1-3 Years Operating Leases, Future Minimum Payments, Due in Two and Three Years 3-5 Years Operating Leases, Future Minimum Payments, Due in Four and Five Years After 5 years Operating Leases, Future Minimum Payments, Due Thereafter Total Operating Leases, Future Minimum Payments Due Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments, Gain (Loss) by Hedging Relationship, by Income Statement Location, by Derivative Instrument Risk [Table] Derivative Instruments, Gain (Loss) [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract Type [Domain] Derivative Contract [Domain] Foreign currency contracts Foreign Currency Contracts [Member] Foreign Currency Contracts [Member] Forward Contracts [Member] Forward Contracts [Member] Currency Swap [Member] Currency Swap [Member] 2024 Euro Notes Senior Notes, Euro Note, Due Two Thousand Twenty Four [Member] Senior Notes, Euro Note, Due Two Thousand Twenty Four [Member] Interest rate swaps Interest Rate Swap [Member] Senior Notes 2016 Senior Notes In Two Thousand Sixteen [Member] Senior Notes In Two Thousand Sixteen [Member] Senior Notes Maturing 2021 through 2026 Senior Notes Maturing 2021 through 2026 [Member] Senior Notes Maturing 2021 through 2026 [Member] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Cost of goods sold Cost Of Goods Sold [Member] Cost of Goods Sold Member. 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net of tax Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax Pension and postretirement net liability Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Cash dividends declared Dividends, Common Stock, Cash Stock options/SSARs Stock Issued During Period, Value, Stock Options Exercised Stock options, shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Treasury share repurchases, shares Stock Repurchased During Period, Shares Treasury share repurchases Stock Repurchased During Period, Value Vested restricted stock units and awards Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Vested restricted stock units and awards, shares Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Stock-based compensation Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture Redeemable NCI Net Income (Loss) Attributable to Redeemable Noncontrolling Interest Dividends paid on noncontrolling interest and other activities Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Ending Balance Ending Balance, shares Business Combinations [Abstract] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Business Acquisition [Line Items] Business Acquisition [Line Items] Unaudited pro forma net sales Business Acquisition, Pro Forma Revenue Unaudited pro forma net income attributable to the Company Business Acquisition, Pro Forma Net Income (Loss) Goodwill and Intangible Assets Disclosure [Abstract] Schedule of Movements in Goodwill Schedule of Goodwill [Table Text Block] Schedule of Other Intangible Assets, Net Schedule of Finite-Lived Intangible Assets [Table Text Block] Schedule of Finite-Lived Intangible Assets, Future Amortization Expense Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Restructuring and Related Activities [Abstract] Restructuring and Other Charges, Net Restructuring and Related Activities Disclosure [Text Block] Postemployment Benefits [Abstract] Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Retirement Plan Type [Axis] Retirement Plan Type [Axis] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Defined Contribution and Other Retirement Plans Other Postretirement Benefits Plan [Member] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Service cost for benefits earned Defined Benefit Plan, Service Cost Interest cost on projected benefit obligation Defined Benefit Plan, Interest Cost Net amortization and deferrals Defined Benefit Plan Amortization And Deferrals Net Defined benefit plan amortization and deferrals, net. Net periodic benefit (income) cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Investments, All Other Investments [Abstract] Financial Instruments Financial Instruments Disclosure [Text Block] Operating lease cost Operating Lease, Cost Goodwill [Roll Forward] Goodwill [Roll Forward] Balance at December 31, 2018 Goodwill Acquisitions(1) Goodwill, Acquired During Period Frutarom measurement period adjustment Goodwill, Period Increase (Decrease) Foreign exchange Goodwill, Foreign Currency Translation Gain (Loss) Balance at June 30, 2019 Carrying Amount and Estimated Fair Values of Financial Instruments Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Derivative Instruments Notional Amount Outstanding Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] Derivative Instruments Measured at Fair Value Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Derivative Instruments Which Were Not Designated as Hedging Instruments Derivatives Not Designated as Hedging Instruments [Table Text Block] Derivative Instruments Designated as Cash Flow and Net Investment Hedging Instruments Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss) [Table Text Block] Reportable Segment Information Schedule of Segment Reporting Information, by Segment [Table Text Block] Net Sales by Destination of Product Delivery Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block] Earnings Per Share [Abstract] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Award Type [Axis] Award Type [Axis] Award Type [Domain] Award Type [Domain] Employee Stock Option Share-based Payment Arrangement, Option [Member] Stock-Settled Appreciation Rights (SARs) Stock-Settled Appreciation Rights (SARs) [Member] Stock-Settled Appreciation Rights (SARs) [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Dividends declared per share, in dollars per share Common Stock, Dividends, Per Share, Declared Stock excluded from computation of diluted net income per share Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Net income allocated to PRS Participating Securities, Distributed and Undistributed Earnings (Loss), Basic Accounting Policies [Abstract] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Revenue Recognition Revenue [Policy Text Block] Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Restatement [Axis] Restatement [Axis] Restatement [Domain] Restatement [Domain] Measurement period adjustments Restatement Adjustment [Member] Percentage of voting interest acquired Business Acquisition, Percentage of Voting Interests Acquired Intangible assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill Other non-current assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets Earn out payable Business Combination, Earn Out Payable Business Combination, Earn Out Payable Deferred income tax liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent Redeemable noncontrolling interest Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Redeemable Noncontrolling Interest Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Redeemable Noncontrolling Interest Goodwill Other Assets [Abstract] Operating lease right-of-use assets Deferred income taxes Deferred Income Taxes and Other Tax Receivable, Current Overfunded pension plans Assets for Plan Benefits, Defined Benefit Plan Cash surrender value of life insurance contracts Cash Surrender Value of Life Insurance Other Other Assets, Miscellaneous, Noncurrent Total Other Assets, Noncurrent Income Statement [Abstract] Cost of goods sold Cost of Goods and Services Sold Gross profit Gross Profit Research and development expenses Research and Development Expense Selling and administrative expenses Selling, General and Administrative Expense Amortization of acquisition-related intangibles Amortization of Intangible Assets Restructuring and other charges, net Losses on sales of fixed assets Operating profit Interest expense Other income, net Taxes on income Income Tax Expense (Benefit) Net income Net Income (Loss) Attributable to Parent Net income attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Net income attributable to IFF stockholders Net Income (Loss) Available to Common Stockholders, Basic Other comprehensive (loss) income, after tax: Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Gains on derivatives qualifying as hedges Net current period other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax Comprehensive income attributable to IFF stockholders Comprehensive Income (Loss), Net of Tax, Attributable to Parent Net income per share - basic (in dollars per share) Earnings Per Share, Basic Net income per share - diluted (in dollars per share) Earnings Per Share, Diluted Average number of shares outstanding - basic (in shares) Weighted Average Number of Shares Outstanding, Basic Average number of shares outstanding - diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Share-based Payment Arrangement [Abstract] Stock-Based Compensation Expense and Related Tax Benefits Share-based Payment Arrangement, Cost by Plan [Table Text Block] Fair Value Disclosures [Abstract] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Measurement Basis [Axis] Measurement Basis [Axis] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Reported Value Measurement Reported Value Measurement [Member] Estimate of Fair Value Measurement [Member] Estimate of Fair Value Measurement [Member] Liability Class [Axis] Liability Class [Axis] Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] 2020 Notes Senior Notes Due Two Thousand and Twenty [Member] Senior Notes Due Two Thousand and Twenty [Member] 2023 Notes Senior Notes Due Two Thousand Twenty Three [Member] Senior Notes Due Two Thousand Twenty Three [Member] 2021 Euro Notes Senior Notes, Euro Notes, Due Two Thousand Twenty One [Member] Senior Notes, Euro 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Payable, Fair Value Disclosure Derivative Asset Derivative Asset Senior Notes, Noncurrent Senior Notes, Noncurrent Derivative Liability Derivative Liability Statement of Cash Flows [Abstract] Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Net income Adjustments to reconcile to net cash provided by operating activities Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization Deferred income taxes Deferred Income Tax Expense (Benefit) Losses on sale of assets Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property Stock-based compensation Share-based Payment Arrangement, Noncash Expense Pension contributions Payment for Pension Benefits Product recall claim settlement, net of insurance proceeds received Gain (Loss) Related To Product Recall Claim Settlement Gain (Loss) Related To Product Recall Claim Settlement Changes in assets and liabilities, net of acquisitions: Increase (Decrease) in Operating Capital [Abstract] Trade receivables Increase (Decrease) in Accounts Receivable Inventories Increase (Decrease) in Inventories Accounts payable Increase (Decrease) in Accounts Payable Accruals for incentive compensation Increase (Decrease) in Employee Related Liabilities Other current payables and accrued expenses Increase (Decrease) in Other Accounts Payable and Accrued Liabilities Other assets Increase (Decrease) in Other Operating Assets Other liabilities Increase (Decrease) in Other Operating Liabilities Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Cash paid for acquisitions, net of cash received Payments to Acquire Businesses, Net of Cash Acquired Additions to property, plant and equipment Payments to Acquire Property, Plant, and Equipment Proceeds from life insurance contracts Proceeds From Termination Of Life Insurance Contracts Proceeds from termination of life insurance contracts Maturity of net investment hedges Payments for (Proceeds from) Hedge, Investing Activities Proceeds from disposal of assets Proceeds from Sale of Productive Assets Contingent consideration paid Payment for Contingent Consideration Liability, Investing Activities Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Cash dividends paid to shareholders Payments of Ordinary Dividends, Common Stock Increase in revolving credit facility and short term borrowings Proceeds from (Repayments of) Short-term Debt Deferred financing costs Payments of Financing Costs Repayments on debt Repayments of Long-term Debt Contingent consideration paid Payment for Contingent Consideration Liability, Financing Activities Proceeds from issuance of stock in connection with stock options Proceeds, Issuance of Shares, Share-based Payment Arrangement, Including Option Exercised Employee withholding taxes paid Excess Tax Benefit from Share-based Compensation, Financing Activities Purchase of treasury stock Payments for Repurchase of Common Stock Net cash used in financing activities Net Cash Provided by (Used in) Financing Activities Effect of exchange rate changes on cash, cash equivalents and restricted cash Effect of Exchange Rate on Cash and Cash Equivalents Net change in cash, cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Cash, cash equivalents and restricted cash at beginning of year Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash, cash equivalents and restricted cash at end of period Supplemental 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in Computation of Basic and Diluted Net Income Per Share Schedule of Weighted Average Number of Shares [Table Text Block] Stock Compensation Plans Share-based Payment Arrangement [Text Block] Net Income Per Share Earnings Per Share [Text Block] Debt Disclosure [Abstract] Components of Debt Schedule of Debt [Table Text Block] Tax effect of gain (losses) on derivatives qualifying as hedges Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax Tax effect of pension liability and postretirement adjustment Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax Cash dividends declared, per share Equity [Abstract] Schedule of Changes in Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Reclassifications of Accumulated Other Comprehensive Income to Consolidated Statement of Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] Operating cash flows from operating leases Operating Lease, Payments Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] LIBOR London Interbank Offered Rate (LIBOR) [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Loans payable Loans Payable [Member] Revolver Borrowings Revolver Borrowings [Member] Revolver borrowings [Member] Bank overdrafts and other Bank Borrowings And Overdrafts [Member] Bank borrowings and overdrafts. Deferred realized gains on interest rate swaps Deferred Realized Gains On Interest Rate Swaps [Member] Deferred realized gains on interest rate swaps. Debt Instrument [Line Items] Debt Instrument [Line Items] Effective Interest Rate Debt Instrument, Interest Rate, Stated Percentage Credit facilities Bank overdrafts and other Short-term Debt Deferred realized gains on interest rate swaps Other Long-term Debt, Noncurrent Long-term Debt, Gross Long-term Debt, Gross Less: Short term borrowings Long-term Debt, Current Maturities Long-term debt Long-term Debt, Excluding Current Maturities Lease cost and other information Lease, Cost [Table Text Block] Supplemental balance sheet information and leases by region Assets And Liabilities, Lessee [Table Text Block] Assets And Liabilities, Lessee [Table Text Block] Maturities of lease liabilities Lessee, Operating Lease, Liability, Maturity [Table Text Block] Maturities of lease liabilities, prior to adoption Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Cash and cash equivalents Business Combination, Recognized Identifiable Assets Acquired and Liabilities 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Recognized Identifiable Assets Acquired And Liabilities Assumed, Noncontrolling Interest Goodwill Total Purchase Consideration Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net Other current liabilities Operating Lease, Liability, Current Operating lease liabilities Operating Lease, Liability, Noncurrent Total operating lease liabilities Operating Lease, Liability Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Segments [Axis] Flavor Compounds Fragrance Compounds Ingredients Fragrance Ingredients [Member] Fragrance Ingredients [Member] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Receivables (included in Trade receivables) Accounts Receivable, after Allowance for Credit Loss Contract asset - Short term Contract with Customer, Asset, Net, Current Revenues Revenues Estimated future intangible amortization expense, 2019 Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year Estimated future intangible amortization expense, 2020 Finite-Lived Intangible Assets, Amortization Expense, Year Two Estimated future intangible amortization expense, 2021 Finite-Lived Intangible Assets, Amortization Expense, Year Three Estimated future intangible amortization expense, 2022 Finite-Lived Intangible Assets, Amortization Expense, Year Four Estimated future intangible amortization expense, 2023 Finite-Lived Intangible Assets, Amortization Expense, Year Five Leases Lessee, Operating Leases [Text Block] Segment Information Segment Reporting Disclosure [Text Block] Offsetting [Abstract] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Hedging Designation [Axis] Hedging Designation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Fair Value of Derivatives Designated as Hedging Instruments [Member] Designated as Hedging Instrument [Member] Fair Value of Derivatives Not Designated as Hedging Instruments [Member] Not Designated as Hedging Instrument [Member] Foreign currency contracts Foreign Exchange Contract [Member] Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Total Fair Value, Derivative Assets Derivative Asset, Fair Value, Gross Asset Total Fair Value, Derivative Liabilities Derivative Liability, Fair Value, Gross Liability Goodwill and Other Intangible Assets, Net Goodwill and Intangible Assets Disclosure [Text Block] Noncontrolling Interest [Abstract] Noncontrolling Interest [Table] Noncontrolling Interest [Table] Redeemable Noncontrolling Interest Redeemable Noncontrolling Interest [Member] Redeemable Noncontrolling Interest [Member] Noncontrolling Interest [Line Items] Noncontrolling Interest [Line Items] Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] Balance at December 31, 2018 Stockholders' Equity Attributable to Noncontrolling Interest Acquired through acquisitions during 2019 Noncontrolling Interest, Increase from Business Combination Impact of foreign exchange translation Noncontrolling Interest, Impact Of Foreign Exchange Translation Noncontrolling Interest, Impact Of Foreign Exchange Translation Share of profit or loss attributable to redeemable noncontrolling interests Redemption value mark-up for the current period Noncontrolling Interest, Change in Redemption Value Exercises of redeemable noncontrolling interests Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests Measurement period adjustments Noncontrolling Interest, Period Increase (Decrease) Balance at June 30, 2019 Acquisitions Business Combination Disclosure [Text Block] Contract Asset and Accounts Receivable Contract with Customer, Asset and Liability [Table Text Block] Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Schedule of Restructuring and Related Costs [Table] Schedule of Restructuring and Related Costs [Table] Restructuring Type [Axis] Restructuring Type [Axis] Type of Restructuring [Domain] Type of Restructuring [Domain] Employee Severance Employee Severance [Member] Contract Termination Contract Termination [Member] Restructuring Plan [Axis] Restructuring Plan [Axis] Restructuring Plan [Domain] Restructuring Plan [Domain] Frutarom Integration Initiative Frutarom Integration Initiative [Member] Frutarom Integration Initiative [Member] 2019 Severance Initiatives 2019 Severance Initiatives [Member] 2019 Severance Initiatives [Member] 2017 Productivity Program 2017 Productivity Program [Member] 2017 Productivity Program [Member] Restructuring Cost and Reserve [Line Items] Restructuring Cost and Reserve [Line Items] Expected number of sites closed Restructuring And Related Cost, Expected Number Of Sites Closed Restructuring And Related Cost, Expected Number Of Sites Closed Expected number of sites 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Finished Goods, Net of Reserves Total Inventories Inventory, Net Prepaid expenses and other current assets Other Assets, Current Total Current Assets Assets, Current Property, plant and equipment, at cost Property, Plant and Equipment, Gross Accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Total Property Plant and Equipment Property, Plant and Equipment, Net Other intangible assets, net Finite-Lived Intangible Assets, Net Other assets Total Assets Assets LIABILITIES AND SHAREHOLDERS’ EQUITY Liabilities and Equity [Abstract] Current Liabilities: Liabilities, Current [Abstract] Bank borrowings, overdrafts, and current portion of long-term debt Debt, Current Accounts payable Accounts Payable, Current Accrued payroll and bonus Employee-related Liabilities, Current Dividends payable Dividends Payable, Current Other current liabilities Other Liabilities, Current Total Current Liabilities Liabilities, Current Retirement liabilities Liability, Defined Benefit Plan, Noncurrent Deferred income taxes Deferred Income Tax Liabilities, Net Other liabilities Other Liabilities, Noncurrent Total Other Liabilities Liabilities, Noncurrent Commitments and Contingencies Commitments and Contingencies Redeemable noncontrolling interests Redeemable Noncontrolling Interest, Equity, Carrying Amount Shareholders' Equity: Stockholders' Equity Attributable to Parent [Abstract] Common stock 12 1/2¢ par value; 500,000,000 shares authorized; 128,526,137 shares issued as of June 30, 2019 and December 31, 2018; and 106,774,300 and 106,619,202 shares outstanding as of June 30, 2019 and December 31, 2018, respectively Common Stock, Value, Issued Capital in excess of par value Additional Paid in Capital, Common Stock Retained earnings Retained Earnings (Accumulated Deficit) Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Treasury stock, at cost (21,751,837 and 21,906,935 shares as of June 30, 2019 and December 31, 2018, respectively) Treasury Stock, Value Total Shareholders’ Equity Stockholders' Equity Attributable to Parent Noncontrolling interest Total Shareholders’ Equity including noncontrolling interest Total Liabilities and Shareholders’ Equity Liabilities and Equity Commitments and Contingencies Disclosure [Abstract] Commitments And Contingencies [Table] Commitments And Contingencies [Table] Commitments And Contingencies [Table] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Amended credit facility Revolving Credit Facility [Member] Lender Name [Axis] Lender Name [Axis] Line of Credit Facility, Lender [Domain] Line of Credit Facility, Lender [Domain] Citibank, N.A. Citibank, N.A [Member] Citibank, N.A [Member] Statistical Measurement [Axis] Statistical Measurement [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Investment, Name [Axis] Investment, Name [Axis] Investment, Name [Domain] Investment, Name [Domain] Guangzhou Flavors Plant Guangzhou Flavors Plant [Member] Guangzhou Flavors Plant [Member] Guangzhou Fragrance Plant Guangzhou Fragrance Plant [Member] Guangzhou Fragrance Plant [Member] Zhejiang Ingredients Plant Zhejiang Ingredients Plant [Member] Zhejiang Ingredients Plant [Member] Investment Geographic Region [Axis] Investment Geographic Region [Axis] Investment Geographic Region [Domain] Investment Geographic Region [Domain] CHINA CHINA Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Bank guarantees and standby letters of credit Bank Guarantees And Standby Letters Of Credit [Member] Bank Guarantees and Standby Letters of Credit [Member] Pledged assets Pledged Assets [Member] Pledged Assets [Member] Reserve for Environmental Costs SEC Schedule, 12-09, Reserve, Environmental Cost [Member] Damages from Product Defects Damages from Product Defects [Member] Commitments And Contingencies [Line Items] Commitments And Contingencies [Line Items] Commitments And Contingencies [Line Items] Bank guarantees and letters of credit outstanding Bank Guarantees And Letters Of Credit Outstanding The total amount of bank guarantees and letters of credit as of the balance sheet. Bank guarantees related to appeals on income tax and indirect tax cases Bank Guarantees Related To Appeals On Income Tax And Indirect Tax Cases The amount of bank guarantees related to appeals on income tax and indirect tax cases. The amount of pledged assets, principally PP&E to cover income tax and indirect tax assessments Amount Of Pledged Assets Principally Pp E To Cover Income Tax And Indirect Tax Assessments The amount of pledged assets, principally PP&E to cover income tax and indirect tax assessments. Line of credit facility, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Available lines of credit Amount Of Available Lines Of Credit Amount Of Available Lines Of Credit Duration as potentially responsible party, years Duration As Potentially Responsible Party Duration As Potentially Responsible Party Number of facilities under potentially responsible party investigation Number Of Facilities Under Potentially Responsible Party Investigation Number of Facilities Under Potentially Responsible Party Investigation Estimation of possible loss Loss Contingency, Estimate of Possible Loss Property, Plant and Equipment, Net Gain Contingency, Expected Relocation Payments Gain Contingency, Expected Relocation Payments Gain Contingency, Expected Relocation Payments Gain Contingency, Relocation Payments Received Gain Contingency, Relocation Payments Received Gain Contingency, Relocation Payments Received Number of facilities Number of Facilities Number of Facilities Bank guarantees and pledged assets to pursue defenses related to other contingencies Bank Guarantees And Pledged Assets To Pursue Defenses Related To Other Contingencies Bank guarantees and pledged assets to pursue defenses related to other contingencies. Loss contingency accrual for the period Loss Contingency Accrual, Period Increase (Decrease) Additional litigation reserve Estimated Litigation Liability Product liability Product Liability Accrual, Period Expense Settlement of claim Product Liability Contingency, Loss Exposure in Excess of Accrual, Aggregate Amount Paid Product Liability Contingency, Loss Exposure in Excess of Accrual, Aggregate Amount Paid Product Liability Contingency, Loss Exposure in Excess of Accrual, Amount Paid Product Liability Contingency, Loss Exposure in Excess of Accrual, Amount Paid Product Liability Contingency, Loss Exposure in Excess of Accrual, Amount Paid Reimbursement to supplier Product Liability Contingency, Loss Exposure In Excess Of Accrual, Reimbursement To Supplier For Product Recall Product Liability Contingency, Loss Exposure In Excess Of Accrual, Reimbursement To Supplier For Product Recall Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Wiburg Canada Wiburg Canada [Member] Wiburg Canada [Member] Mighty and Leagel Mighty and Leagel [Member] Mighty and Leagel [Member] Percentage of interests acquired Payments to acquire businesses Payments to Acquire Businesses, Gross Goodwill, expected tax deductible amount Business Acquisition, Goodwill, Expected Tax Deductible Amount Contingent consideration, liability Business Combination, Contingent Consideration, Liability Cover page. Entities [Table] Entities [Table] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Common Stock, par value 12 1/2¢ per share 6.00% Tangible Equity Units 6.00% Tangible Equity Units [Member] 6.00% Tangible Equity Units [Member] 0.500% Senior Notes due 2021 0.500% Senior Notes Due 2021 [Member] 0.500% Senior Notes Due 2021 [Member] 1.750% Senior Notes due 2024 1.750% Senior Notes Due 2024 [Member] 1.750% Senior Notes Due 2024 [Member] 1.800% Senior Notes due 2026 1.800% Senior Notes Due 2026 [Member] 1.800% Senior Notes Due 2026 [Member] Entity Information [Line Items] Entity Information [Line Items] Document Type Document Type Document Quarterly Report Document Quarterly Report Document Period End Date Document Period End Date Document Transition Report Document Transition Report Entity File Number Entity File Number Entity Registrant Name Entity Registrant Name Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Entity Tax Identification Number Entity Tax Identification Number Entity Address, Address Line One Entity Address, Address Line One Entity Address, City or Town Entity Address, City or Town Entity Address, State or Province Entity Address, State or Province Entity Address, Postal Zip Code Entity Address, Postal Zip Code City Area Code City Area Code Local Phone Number Local Phone Number Entity Current Reporting Status Entity Current Reporting Status Entity Interactive Data Current Entity Interactive Data Current Entity Filer Category Entity Filer Category Entity Small Business Entity Small Business Entity Emerging Growth Company Entity Emerging Growth Company Entity Shell Company Entity Shell Company Title of 12(b) Security Title of 12(b) Security Trading Symbol Trading Symbol Security Exchange Name Security Exchange Name Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Trade receivables allowances Accounts Receivable, Allowance for Credit Loss, Current Common stock, par value, in dollars per share Common Stock, Par or Stated Value Per Share Common stock, shares authorized Common Stock, Shares Authorized Common stock, shares issued Common Stock, Shares, Issued Common stock, shares outstanding Common Stock, Shares, Outstanding Treasury stock, shares at cost Schedule of Revenues from External Customers and Long-Lived Assets [Table] Schedule of Revenues from External Customers and Long-Lived Assets [Table] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Geographic Concentration Risk Geographic Concentration Risk [Member] Net sales related to the U.S. UNITED STATES Net sales attributed to all foreign countries All Foreign Countries [Member] All Foreign Countries [Member] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Sales Sales [Member] Revenues from External Customers and Long-Lived Assets [Line Items] Revenues from External Customers and Long-Lived Assets [Line Items] Number of segments Number of Operating Segments Number of categories Number Of Fragrance Categories Number of fragrance categories. Maximum percentage of total consolidated net sales attributed to any non-U.S. country Concentration Risk, Percentage Schedule of Other Assets Schedule of Other Assets [Table Text Block] Derivative [Table] Derivative [Table] Underlying Asset Class [Axis] Underlying Asset Class [Axis] Underlying Asset Class [Domain] Underlying Asset Class [Domain] Deal Contingent Swaps Deal Contingent Swaps [Member] Deal Contingent Swaps [Member] Net Investment Hedging [Member] Designated as Hedging Instrument [Member] Not Designated as Hedging Instrument [Member] Foreign currency contract Foreign Exchange Forward [Member] Derivative [Line Items] Derivative [Line Items] Term of derivative Derivative, Term of Contract Number of instruments terminated (swap) Derivative, Number of Instruments Terminated Derivative, Number of Instruments Terminated Derivative losses included in AOCI Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months Net investment hedge ineffectiveness Amount of Ineffectiveness on Net Investment Hedges Cash flow hedge ineffectiveness Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net Notional amount Derivative, Notional Amount Derivative, Gain (Loss) on Derivative, Net Derivative, Gain (Loss) on Derivative, Net Remaining lease term Lessee, Operating Lease, Remaining Lease Term Lessee, Operating Lease, Remaining Lease Term Option to extend lease term Lessee, Operating Lease, Renewal Term Total Cumulative effect Schedule of assets acquired and liabilities assumed Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Schedule of intangible assets acquired Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block] Unaudited pro forma information Business Acquisition, Pro Forma Information [Table Text Block] Other Nonoperating Income (Expense) [Member] Other Nonoperating Income (Expense) [Member] Schedule of Redeemable Noncontrolling Interest Redeemable Noncontrolling Interest [Table Text Block] Income Taxes Disclosure [Table] Income Taxes Disclosure [Table] Income Taxes Disclosure [Table] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Other Liabilities Other Liabilities [Member] Income Tax Authority [Axis] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] Foreign Tax Authority Foreign Tax Authority [Member] Tax Credit Carryforward [Axis] Tax Credit Carryforward [Axis] Tax Credit Carryforward, Name [Domain] Tax Credit Carryforward, Name [Domain] Spanish tax settlement Spanish Income Tax [Member] Spanish Income Tax [Member] Income Taxes [Line Items] Income Taxes [Line Items] Income Taxes [Line Items] Unrecognized tax benefits that would impact effective tax rate Unrecognized Tax Benefits that Would Impact Effective Tax Rate Accrued interest and penalties Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Provision for uncertain tax positions Liability for Uncertainty in Income Taxes, Noncurrent Effective tax rate Effective Income Tax Rate Reconciliation, Percent Domestic earnings repatriated Deferred Tax Liability, Domestic Earnings Repatriated Deferred Tax Liability, Domestic Earnings Repatriated Undistributed foreign earnings Deferred Tax Liabilities, Undistributed Foreign Earnings Decrease in receivables due to factoring Decrease In Receivables Due To Factoring Decrease In Receivables Due To Factoring New Accounting Pronouncement, Early Adoption [Table] New Accounting Pronouncement, Early Adoption [Table] New Accounting Pronouncement, Early Adoption [Line Items] New Accounting Pronouncement, Early Adoption [Line Items] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs, by Report Line [Axis] Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Report Line [Domain] Equity-based awards Equity Based Awards [Member] Equity-based awards [Member] Liability-based awards Liability Based Awards [Member] Liability-based awards [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Total stock-based compensation expense Share-based Payment Arrangement, Expense Less: Tax benefit Share-based Payment Arrangement, Expense, Tax Benefit Total stock-based compensation expense, after tax Share-based Payment Arrangement, Expense, after Tax Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income Loss [Text Block] Accumulated Other Comprehensive Income Loss [Text Block] Weighted Average Remaining Lease Term (in years) Operating Lease, Weighted Average Remaining Lease Term Weighted Average Discount Rate Operating Lease, Weighted Average Discount Rate, Percent Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Stock options and restricted stock awards Employee Stock Option And Restricted Stock [Member] Employee Stock Option And Restricted Stock [Member] SPC portion of TEUs Stock Purchase Contract [Member] Stock Purchase Contract [Member] Net income attributable to IFF stockholders Less: Increase in redemption value of redeemable noncontrolling interests in excess of earnings allocated Increase In Redemption Value, Redeemable Noncontrolling Interest Increase In Redemption Value, Redeemable Noncontrolling Interest Net income available to IFF stockholders Net Income (Loss) Available To Common Stockholders, Adjustment Net Income (Loss) Available To Common Stockholders, Adjustment Weighted average common shares outstanding (basic) (in shares) Adjustment for assumed dilution (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Weighted average shares assuming dilution (diluted) (in shares) Retirement Benefits [Abstract] Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets 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] Schedule Of Information By Major Category Of Credit Derivatives Contracts [Line Items] Schedule Of Information By Major Category Of Credit Derivatives Contracts [Line Items] Schedule Of Information By Major Category Of Credit Derivatives Contracts [Line Items] Derivative instruments outstanding Fragrance Ingredients Rationalization Fragrance Ingredients Rationalization [Member] Fragrance Ingredients Rationalization [Member] Employee-Related Costs Employee -Related Costs [Member] Employee -Related Costs [Member] Other Other Restructuring [Member] Restructuring Reserve [Roll Forward] Restructuring Reserve [Roll Forward] Beginning Balance Restructuring Reserve Additional charges, net Payments Ending Balance Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Translation Adjustment [Member] Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Accumulated Defined Benefit Plans Adjustment Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] AOCI Attributable to Parent [Member] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Stockholders' Equity Attributable to Parent OCI, before Reclassifications, Net of Tax, Attributable to Parent OCI, before Reclassifications, Net of Tax, Attributable to Parent Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Accumulated Other Comprehensive Income (Loss) [Roll Forward] Accumulated Other Comprehensive Income (Loss) [Roll Forward] Accumulated Other Comprehensive Income (Loss) [Roll Forward] Accumulated other comprehensive loss (income), net of tax, beginning balance Amounts reclassified from AOCI Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Accumulated other comprehensive loss (income), net of tax, ending balance Changes in Employee-Related Restructuring Liabilities Schedule of Restructuring Reserve by Type of Cost [Table Text Block] Tangible equity units issued Tangible Equity Units Issued Tangible Equity Units Issued Tangible equity units proceeds Tangible Equity Units Proceeds Tangible Equity Units Proceeds Price for basic share (usd per share) Tangible Equity Units, Price for Shares Basic Tangible Equity Units, Price for Shares Basic Price for shares diluted (usd per share) Tangible Equity Units, Price for Shares Diluted Tangible Equity Units, Price for Shares Diluted Difference amount between basic and diluted net income per share Difference Amount Between Basic And Diluted Net Income Per Share Difference amount between basic and diluted net income per share. Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Customer relationships Customer Relationships [Member] Trade names & patents Trademarks and Trade Names [Member] Technological know-how Technology-Based Intangible Assets [Member] Other Other Intangible Assets [Member] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Total carrying value Finite-Lived Intangible Assets, Gross Total accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Other intangible assets, net Pension and Other Defined Contribution Retirement Plan Expenses Pension Expenses [Table Text Block] Table for Net Periodic Benefit Cost and Changes in Plan Assets and Benefit Obligations Recognized in OCI. Postretirement Benefits Other Than Pension Expenses Schedule of Net Benefit Costs [Table Text Block] Employee Benefits Pension and Other Postretirement Benefits Disclosure [Text Block] Debt Debt Disclosure [Text Block] Product formula Product Formula [Member] Product Formula [Member] Trade names Trademarks [Member] Favorable/Unfavorable Leases, net Above Market Leases [Member] Estimated Amounts Finite-lived Intangible Assets Acquired Weighted-Average Useful Life Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Less than 1 Year Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year 1-3 Years Lessee, Operating Lease, Liability, Payments, Due Year Two And Three Lessee, Operating Lease, Liability, Payments, Due Year Two And Three 3-5 Years Lessee, Operating Lease, Liability, Payments, Due Year Four And Five Lessee, Operating Lease, Liability, Payments, Due Year Four And Five After 5 years Lessee, Operating Lease, Liability, Payments, Due after Year Five Less: Imputed Interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Other Assets Other Assets Disclosure [Text Block] Schedule Of Reclassification Of Accumulated Other Comprehensive Income Loss [Table] Schedule Of Reclassification Of Accumulated Other Comprehensive Income Loss [Table] Schedule Of Reclassification Of Accumulated Other Comprehensive Income Loss [Table] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income [Member] Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member] Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member] Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] 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] Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax Redeemable Noncontrolling Interests Noncontrolling Interest Disclosure [Text Block] Nature of Operations and Summary of Significant Accounting Policies Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]