Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Weighted-average shares outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Trading Arrangement: Trading Arrangement [Axis] Incremental Term Facility due 2029 Incremental Term Facility Due 2029 [Member] Incremental Term Facility Due 2029 Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Range [Domain] Statistical Measurement [Domain] Number of executives named in lawsuit Loss Contingency, Number Of Executives Loss Contingency, Number Of Executives Sold portion of royalty revenue Royalty revenue Royalty revenue Purchase And Sale Agreement, Sold Portion Of Royalty Revenue Purchase And Sale Agreement, Sold Portion Of Royalty Revenue Title of 12(b) Security Title of 12(b) Security Carrying Amount Reported Value Measurement [Member] Subsequent Event Subsequent Event [Member] Document Fiscal Year Focus Document Fiscal Year Focus Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Table] Adjustment to Compensation, Amount Adjustment to Compensation Amount Customer [Axis] Customer [Axis] Segment Reporting [Abstract] Segment Reporting [Abstract] Common stock, no par value, 5,000,000,000 shares authorized, 499,549,698 and 496,975,154 shares issued and outstanding as of June 30, 2026 and December 31, 2025, respectively Common Stock, Value, Issued Shares repurchased for employee tax withholdings Payment, Tax Withholding, Share-Based Payment Arrangement Schedule of Long-term Debt Schedule of Long-Term Debt Instruments [Table Text Block] Christopher Dougherty v. Elanco Animal Health, Inc. Christopher Dougherty v. Elanco Animal Health, Inc. [Member] Christopher Dougherty v. Elanco Animal Health, Inc. Line of Credit Line of Credit [Member] Restatement Determination Date Restatement Determination Date Liability For Sale Of Future Revenue [Roll Forward] Liability For Sale Of Future Revenue [Roll Forward] Liability For Sale Of Future Revenue Total debt Long-Term Debt and Lease Obligation, Including Current Maturities Derivative Instrument [Axis] Derivative Instrument [Axis] Proceeds from divestitures Proceeds from Divestiture of Businesses Amendment Flag Amendment Flag Current Liabilities Liabilities, Current [Abstract] Asset impairment, restructuring and other special charges Restructuring Costs and Asset Impairment Charges Entity Common Stock, Shares Outstanding (in shares) Entity Common Stock, Shares Outstanding Disposal Group Classification [Axis] Disposal Group Classification [Axis] Property and equipment, net Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment Loss Contingencies [Table] Loss Contingencies [Table] Blackstone Life Sciences and Blackstone Credit & Insurance Blackstone Life Sciences And Blackstone Credit & Insurance [Member] Blackstone Life Sciences And Blackstone Credit & Insurance Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Entity Address, State or Province Entity Address, State or Province Foreign currency translation, net of taxes Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent PEO Total Compensation Amount PEO Total Compensation Amount Noncurrent Liabilities Liabilities, Noncurrent [Abstract] Other intangibles, net Intangible Asset, Excluding Goodwill, after Accumulated Amortization Notional amount Derivative, Notional Amount Basic (in shares) Basic weighted-average common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Proceeds from sale of future revenue, net of transaction costs Proceeds from Sale of Future Revenue Proceeds from Sale of Future Revenue Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Liability for sale of future revenue Sale Of Future Revenue, Liability, Noncurrent Sale Of Future Revenue, Liability, Noncurrent Loss Contingencies [Line Items] Loss Contingencies [Line Items] Number of reportable segments Number of Reportable Segments Total current liabilities Liabilities, Current Customer Relationships Customer Relationships [Member] Derivative liability, current Derivative Liability, Current Product Return Concentration Risk Product Return Concentration Risk [Member] Product Return Concentration Risk [Member] Consideration transferred in a business combination Business Combination, Noncash Consideration Business Combination, Noncash Consideration Concentration Risk [Table] Concentration Risk [Table] Entity Address, City or Town Entity Address, City or Town Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Product Sales Product [Member] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount AHV International B.V AHV International B.V [Member] AHV International B.V NutriQuest, LLC NutriQuest, LLC [Member] NutriQuest, LLC Net revenue Revenue from Contract with Customer Benchmark [Member] Significant Other Observable Inputs (Level 2) Fair Value, Inputs, Level 2 [Member] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Contingent payments Fair value of contingent consideration Business Combination, Consideration Transferred, Contingent Consideration Business Combination, Consideration Transferred, Contingent Consideration Borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Revenue Revenue Benchmark [Member] United States UNITED STATES Proceeds from sale of future revenue Proceeds from sale of future revenue Purchase And Sale Agreement, Consideration Received Purchase And Sale Agreement, Consideration Received Subsequent Event Type [Axis] Subsequent Event Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] New Financial Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Litigation Case [Axis] Litigation Case [Axis] Other current liabilities Business Combination, Recognized Liability Assumed, Other Liability, Current Segment Reporting Segment Reporting [Table Text Block] Other comprehensive income (loss), net of taxes Other comprehensive income (loss), net of tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Repayments of facility Repayments of Lines of Credit Total debt Long-Term Debt Payments Contract With Customer, Liability, Increase From Cash Receipts Contract With Customer, Liability, Increase From Cash Receipts Supplemental disclosure of non-cash investing and financing activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Document Period End Date Document Period End Date Net Cash Used for Investing Activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Security Exchange Name Security Exchange Name Effective interest rate Debt Instrument, Interest Rate, Effective Percentage Decrease to LIFO cost Inventory, LIFO Reserve Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Shell Company Entity Shell Company Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Earnings Per Share Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Earnings per share: Earnings Per Share [Abstract] Earnings Per Share [Abstract] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Document Fiscal Period Focus Document Fiscal Period Focus Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Total liabilities Liabilities Trading Symbol Trading Symbol Geographical [Domain] Geographical [Domain] Net purchases of property and equipment and software Payments to Acquire Property, Plant, and Equipment Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Schedule of Fair Value Assets Acquired and Liabilities Assumed Business Combination, Recognized Asset Acquired and Liability Assumed [Table Text Block] Company Selected Measure Name Company Selected Measure Name Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Percentage of long term debt bearing fixed interest Long-Term Debt, Percentage Bearing Fixed Interest, Percentage Rate Concentration Risk [Line Items] Concentration Risk [Line Items] Liability For Sale Of Future Revenue [Line Items] Liability For Sale Of Future Revenue [Line Items] Liability For Sale Of Future Revenue Effective interest rate Purchase And Sale Agreement, Effective Interest Rate Purchase And Sale Agreement, Effective Interest Rate Defined Benefit Plans Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Long-term debt, gross Long-Term Debt, Gross Credit Facility [Domain] Credit Facility [Domain] Farm Animal: Farm Animal [Member] Farm Animal Cash Flows from Operating Activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Other receivables Other Receivables, Net, Current Compensation Amount Outstanding Recovery Compensation Amount Individual: Individual [Axis] Purchase agreement to acquire percentage Business Combination, Voting Equity Interest Acquired, Percentage Diluted (in shares) Diluted weighted-average shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted Senior Notes due 2028 Senior Notes Due 2028 [Member] Senior Notes Due 2028 [Member] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Reduction of revenue Contract with Customer, Liability, Revenue Recognized Including Current Year Additions Contract with Customer, Liability, Revenue Recognized Including Current Year Additions Entity Emerging Growth Company Entity Emerging Growth Company Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Total identifiable net assets acquired Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less) Disposal Group Name [Domain] Disposal Group Name [Domain] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Proceeds from facility Proceeds from facility Proceeds from Lines of Credit Financial Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Gross profit Gross Profit Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Assumed conversion of dilutive common stock equivalents (in shares) Weighted Average Number of Shares Outstanding, Diluted, Adjustment Award Timing Predetermined Award Timing Predetermined [Flag] Cash-based severance and other Severance Costs Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Stock-based compensation activity, net APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Quoted Prices in Active Markets for Identical Assets (Level 1) Fair Value, Inputs, Level 1 [Member] Derivative asset, noncurrent Derivative Asset, Noncurrent Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] All Executive Categories All Executive Categories [Member] Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Swine Swine [Member] Swine Long-term debt, excluding finance lease liability Long-Term Debt, Fair Value Depreciation expense Depreciation Scenario [Domain] Scenario [Domain] Marketing and selling Selling and Marketing Expense Concentration Risk Type [Domain] Concentration Risk Type [Domain] Accounting Changes and Error Corrections [Abstract] Accounting Changes and Error Corrections [Abstract] Unrealized gain expected to be reclassified over the next 12 months Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net Schedule of Basic And Diluted Weighted-average Shares Outstanding Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Total consideration transferred Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Liability For Sale Of Future Revenue [Abstract] Liability For Sale Of Future Revenue Current portion of long-term debt and finance lease liability Less current portion of long-term debt and finance lease liability Long-Term Debt and Lease Obligation, Current Business Segment Information Segment Reporting [Text Block] Expiration Date Trading Arrangement Expiration Date Hedging Relationship [Axis] Hedging Relationship [Axis] Schedule of Revenue Disaggregated by Product Category Disaggregation of Revenue [Table Text Block] Effect of exchange rate changes on cash and cash equivalents Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Disposal Group, Including Discontinued Operations [Line Items] Disposal Group, Including Discontinued Operations [Line Items] Business Combination [Line Items] Business Combination [Line Items] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Common stock, shares authorized (in shares) Common Stock, Shares Authorized Exercise Price Award Exercise Price Schedule of Restructuring and Related Costs [Table] Restructuring Cost [Table] Cash Flows from Investing Activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Segment Reporting [Line Items] Segment Reporting [Line Items] Document Quarterly Report Document Quarterly Report Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Segments [Domain] Segments [Domain] Interest rate swaps Interest Rate Swap [Member] Debt and Finance Lease Liability Debt Disclosure [Text Block] Scenario [Axis] Scenario [Axis] Incremental Term Facility due 2032 Incremental Term Facility Due 2032 [Member] Incremental Term Facility Due 2032 Disposal Group Classification [Domain] Disposal Group Classification [Domain] Unamortized debt issuance costs Debt Issuance Costs, Net Schedule of Asset Impairment, Restructuring and Other Special Charges Restructuring and Related Costs [Table Text Block] Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Equity method investments Equity Method Investments Balance at beginning of period Balance at end of period Restructuring reserve Restructuring Reserve Business Combination [Table] Business Combination [Table] Acquisitions and Divestitures Mergers, Acquisitions and Dispositions Disclosures [Text Block] Equity Component [Domain] Equity Component [Domain] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Deferred Revenue Arrangement, by Type [Table] Deferred Revenue Arrangement, by Type [Table] Secured Debt Secured Debt [Member] Schedule of Sale of Future Revenue Activity Disclosure of Liability for Sale of Future Revenue Activity [Table Text Block] Disclosure of Liability for Sale of Future Revenue Activity Business Combination and Asset Acquisition [Abstract] Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract] Cross-currency fixed interest rate swap Foreign Exchange Contract Foreign Exchange Contract [Member] Total other significant segment expenses Costs and Expenses Adoption Date Trading Arrangement Adoption Date Counterparty Name [Domain] Counterparty Name [Domain] Total equity Balance at beginning of period Balance at end of period Equity, Attributable to Parent Disposal Group, Disposed of by Sale, Not Discontinued Operations Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] Assets Assets [Abstract] Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Insider Trading Policies and Procedures [Line Items] Finance lease liability Finance Lease, Liability Other financing activities, net Proceeds from (Payment for) Other Financing Activity Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Prepaid expenses and other Prepaid Expense and Other Assets, Current Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Marketing, selling and administrative Selling, General and Administrative Expense Business Combination [Domain] Business Combination [Domain] Total expense Restructuring, Settlement and Impairment Provisions Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Number of operating segments Number of Operating Segments Potential common shares excluded from calculation (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Liabilities related to litigation Estimated Litigation Liability Entity Central Index Key Entity Central Index Key Weighted Average Weighted Average [Member] All Adjustments to Compensation All Adjustments to Compensation [Member] Other non-cash operating activities, net Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Other Item Business Combination [Axis] Business Combination [Axis] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Net Cash Provided by Operating Activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Commitments and Contingencies Legal Matters and Contingencies [Text Block] Equity Equity, Attributable to Parent [Abstract] Income Statement [Abstract] Income Statement [Abstract] Document Transition Report Document Transition Report Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Designated as Hedging Instrument Designated as Hedging Instrument [Member] Schedule of Provision for Taxes on Income Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Securitization Facility Securitization Facility [Member] Securitization Facility Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate City Area Code City Area Code Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] All Individuals All Individuals [Member] Schedule of Revenue Disaggregated by Geographic Area Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue [Table Text Block] Name Forgone Recovery, Individual Name Contingent consideration, noncurrent Business Combination, Contingent Consideration, Liability, Noncurrent Incremental Term Facility due 2031 Incremental Term Facility Due 2031 [Member] Incremental Term Facility Due 2031 Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Statement [Line Items] Statement [Line Items] Total assets Assets Interest expense, net of capitalized interest Interest expense, net of capitalized interest Interest Expense, Operating Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Defined benefit plans, net of taxes Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent Total liabilities assumed Business Combination, Recognized Liability Assumed, Liability PEO PEO [Member] Measurement Basis [Axis] Measurement Basis [Axis] Other noncurrent liabilities Other Liabilities, Noncurrent Goodwill Goodwill Goodwill Inventories Business Combination, Recognized Asset Acquired, Inventory, Current Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Accounts payable Business Combination, Recognized Liability Assumed, Accounts Payable, Current Subsequent Event Type [Domain] Subsequent Event Type [Domain] Gains (losses) on net of tax Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), Net Of Tax Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), Net Of Tax Accumulated Deficit Retained Earnings [Member] Revolving Credit Facility Revolving Credit Facility [Member] Software Software, In-Development, Internally Developed, and Purchased [Member] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Common stock, shares outstanding (in shares) Balance at beginning of period (in shares) Balance at end of period (in shares) Common Stock, Shares, Outstanding Award Timing Disclosures [Line Items] Foreign Currency Translation Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Diluted (usd per share) Earnings Per Share, Diluted Entity Current Reporting Status Entity Current Reporting Status Net Cash Used for Financing Activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount Changes in operating assets and liabilities, net of acquisitions and divestitures Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital Cash Flow Hedging Cash Flow Hedging [Member] Number of board members named in lawsuit Loss Contingency, Number Of Board Members Loss Contingency, Number Of Board Members Litigation Case [Domain] Litigation Case [Domain] Schedule of Fair Value Information Fair Value, Liabilities Measured on Recurring Basis [Table Text Block] Acquisition and divestiture-related charges Business Combination And Disposal Group, Related Costs Business Combination And Disposal Group, Related Costs Amortization of intangible assets Amortization of software Intangible Asset, Finite-Lived, Amortization Expense Schedule of Purchase Consideration Business Combination [Table Text Block] Research and development Research and development Research and Development Expense Adjustments to reconcile net income to cash flows from operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Total identifiable assets acquired Business Combination, Recognized Asset Acquired, Asset New Zealand Manufacturing Facility New Zealand Manufacturing Facility [Member] New Zealand Manufacturing Facility Cash Flows from Financing Activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Property and equipment, net Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Revenue Revenue Revenue from Contract with Customer, Excluding Assessed Tax Pet Health Pet Health [Member] Pet Health Schedule of Activity in Reserves Schedule of Restructuring Reserve by Type of Cost [Table Text Block] Inventories Inventory Disclosure [Text Block] Intangible Asset, Finite-Lived, Class [Axis] Intangible Asset, Finite-Lived, Class [Axis] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Underlying Securities Award Underlying Securities Amount Fair Value Estimate of Fair Value Measurement [Member] Revenue Revenue from Contract with Customer [Text Block] Incremental Term Facility due 2028 Incremental Term Facility Due 2028 [Member] Incremental Term Facility Due 2028 Other investing activities, net Payment for (Proceeds from) Other Investing Activity Segment Reporting [Table] Segment Reporting [Table] Contingent consideration, current Business Combination, Contingent Consideration, Liability, Current Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Net (losses) gains on derivative instruments Derivative, Gain (Loss) on Derivative, Net Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Current Fiscal Year End Date Current Fiscal Year End Date Derivatives not yet effective Derivative, Notional Amount, Not Yet Effective Derivative, Notional Amount, Not Yet Effective Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount 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] Entity File Number Entity File Number Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Liability for Sale of Future Revenue Liability for Sale of Future Revenue [Text Block] Liability for Sale of Future Revenue Common stock, shares issued (in shares) Common Stock, Shares, Issued Measure: Measure [Axis] Finished products Inventory, Finished Goods, Gross Royalties from net sales (as a percent) Purchase And Sale Agreement, Future Royalties, Percentage Purchase And Sale Agreement, Future Royalties, Percentage Joseph Barpar v. Elanco Animal Health Inc. Joseph Barpar v. Elanco Animal Health Inc. [Member] Joseph Barpar v. Elanco Animal Health Inc. Foreign currency translation adjustments Contract With Customer, Liability, Foreign Currency Translation Contract With Customer, Liability, Foreign Currency Translation Equity Components [Axis] Equity Components [Axis] Product and Service [Domain] Product and Service [Domain] Euro Term Loan due 2029 Euro Term Loan Due 2029 [Member] Euro Term Loan Due 2029 Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Entity Interactive Data Current Entity Interactive Data Current Deferred 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 Comprehensive Income (Loss), Net of Tax, Attributable to Parent Termination Date Trading Arrangement Termination Date Weighted average useful life Intangible Asset, Finite-Lived, Acquired, Weighted-Average Amortization Period Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Finite-lived intangible assets Finite-lived intangible assets Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Finite-Lived Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Notional amount of derivative with maturity extended Derivative, Notional Amount, Maturity Extended Derivative, Notional Amount, Maturity Extended MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Other current liabilities Other Liabilities, Current Other noncurrent assets Other Assets, Noncurrent Document Type Document Type Cash paid for acquisitions, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Derivative asset, current Derivative Asset, Current Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value as of Grant Date Award Grant Date Fair Value Deferred Revenue Arrangement [Line Items] Deferred Revenue Arrangement [Line Items] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Non-cash charges Restructuring Charges, Non-Cash Restructuring Charges, Non-Cash Arrangement Duration Trading Arrangement Duration Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Local Phone Number Local Phone Number Work in process Inventory, Work in Process, Gross Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Net Investment Hedging Net Investment Hedging [Member] Income before income 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] Commitments and Contingencies Commitments and Contingencies Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Executive Category: Executive Category [Axis] Counterparty Name [Axis] Counterparty Name [Axis] Liabilities and Equity Liabilities and Equity [Abstract] Intangible Asset, Finite-Lived, Class [Domain] Intangible Asset, Finite-Lived, Class [Domain] Trade Names Trade Names [Member] Inventories Inventories Inventory, Net All Award Types Award Type [Domain] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Fair Value Fair Value Disclosures [Text Block] Significant Unobservable Inputs (Level 3) Fair Value, Inputs, Level 3 [Member] PEO Name PEO Name Geographical [Axis] Geographical [Axis] Term Loan B due 2032 Term Loan B Due 2032 [Member] Term Loan B Due 2032 Beginning balance Ending balance Contract with Customer, Liability Cash Flow Hedges Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Other expenses Segment Reporting, Other Segment Item, Amount Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Number of employees transferred Disposal Group, Including Discontinued Operation, Number Of Employees Transferred Disposal Group, Including Discontinued Operation, Number Of Employees Transferred Deferred cash consideration due through 2030 Deferred Payments To Acquire Businesses, Gross Deferred Payments To Acquire Businesses, Gross Cash paid and other Payments for Restructuring Cash and cash equivalents – beginning of period Cash and cash equivalents – end of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Reportable Segment Reportable Segment [Member] Reportable Segment Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [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] Debt Instrument [Axis] Debt Instrument [Axis] Cash consideration paid upon closing Payments to Acquire Businesses, Gross Stock-based compensation expense Share-Based Payment Arrangement, Noncash Expense Tracy Spradlin, Tevra Brands, LLC, And Susan Kraus-Silfen v Elanco Animal Health, Inc Tracy Spradlin, Tevra Brands, LLC, And Susan Kraus-Silfen v Elanco Animal Health, Inc [Member] Tracy Spradlin, Tevra Brands, LLC, And Susan Kraus-Silfen v Elanco Animal Health, Inc Disposal Group Name [Axis] Disposal Group Name [Axis] Customer [Domain] Customer [Domain] Schedule of Inventories Schedule of Inventory, Current [Table Text Block] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Basic (usd per share) Earnings Per Share, Basic Sales rebates and discounts Contract with Customer, Liability, Current Total current assets Assets, Current Range [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Award Type Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Accounts receivable, net Accounts Receivable, after Allowance for Credit Loss, Current Accumulated deficit Retained Earnings (Accumulated Deficit) Restructuring and Related Activities [Abstract] Restructuring and Related Activities [Abstract] Product and Service [Axis] Product and Service [Axis] Cash flow hedges, net of taxes Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent 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] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Common Stock Common Stock [Member] Marketed products Marketed Products [Member] Marketed Products Contingent consideration liability Business Combination, Contingent Consideration, Liability Fair Value Measurement [Domain] Fair Value Measurement [Domain] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] International Non-US [Member] Beginning balance Ending balance Purchase And Sale Agreement, Liability Purchase And Sale Agreement, Liability Derivative Contract [Domain] Derivative Contract [Domain] Concentration risk Concentration Risk, Percentage Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Equity Awards Adjustments Equity Awards Adjustments [Member] Hedging Relationship [Domain] Hedging Relationship [Domain] Derivative liability, noncurrent Derivative Liability, Noncurrent Change In Contract With Customer, Liability [Roll Forward] Change In Contract With Customer, Liability [Roll Forward] Change In Contract With Customer, Liability [Roll Forward] Total liabilities and equity Liabilities and Equity Asset Impairment, Restructuring and Other Special Charges Restructuring, Impairment, and Other Activities Disclosure [Text Block] Employee Stock Option Share-Based Payment Arrangement, Option [Member] Other items Disposal Group, Not Discontinued Operation, Other Special Charges Disposal Group, Not Discontinued Operation, Other Special Charges Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Charges Restructuring Charges Inventory Disclosure [Abstract] Inventory Disclosure [Abstract] Tabular List, Table Tabular List [Table Text Block] Additional paid-in capital Additional Paid in Capital Cattle Cattle [Member] Cattle Repayments of long-term borrowings Repayments of Senior Debt Other (income) expense, net Other (income) expense, net Other Operating Income (Expense), Net 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] Noncurrent Assets Assets, Noncurrent [Abstract] General and administrative General and Administrative Expense Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Raw materials and supplies Inventory, Raw Materials and Supplies, Gross Preferred stock, 1,000,000,000 shares authorized, no par value; none issued Preferred Stock, Value, Issued Adjustment to Compensation: Adjustment to Compensation [Axis] Number of pending claims Loss Contingency, Pending Claims, Number Reclassification from accumulated other comprehensive income, current period, net of tax Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Contract Manufacturing and Other Contract Manufacturing [Member] Contract Manufacturing [Member] Hedging Designation [Domain] Hedging Designation [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 Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Hedging Designation [Axis] Hedging Designation [Axis] Global Customers Global Customers [Member] Global Customers Credit Facility [Axis] Credit Facility [Axis] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Long-term debt and finance lease liability Total long-term debt and finance lease liability Long-Term Debt and Lease Obligation Name Measure Name Income Taxes Income Tax Disclosure [Text Block] Accounts payable Accounts Payable, Current Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Debt Instrument [Line Items] Debt Instrument [Line Items] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Total purchase consideration Total purchase consideration Business Combination, Consideration Transferred Single Customer Customer A [Member] Customer A [Member] Additional Paid-in Capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Schedule of Gain (Loss), Net of Tax Offsetting Liabilities [Table Text Block] Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and Cash Equivalent Basis of Presentation and Summary of Significant Accounting Policies Basis of Accounting [Text Block] Deferred transaction costs Purchase And Sale Agreement, Transaction Costs Purchase And Sale Agreement, Transaction Costs Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Company Selected Measure Amount Company Selected Measure Amount Not Designated as Hedging Instrument Not Designated as Hedging Instrument [Member] Other significant segment expenses: Segment Reporting, Reconciliation of Other Item by Segment to Consolidated [Abstract] Effective tax rate Effective Income Tax Rate Reconciliation, Percent, Adjusted Effective Income Tax Rate Reconciliation, Percent, Adjusted Depreciation and amortization Depreciation, Depletion and Amortization Total Inventory, Gross Stock-based compensation activity, net (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Right-of-use assets obtained in exchange for new finance lease liability Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Current Assets Assets, Current [Abstract] Non-PEO NEO Non-PEO NEO [Member] Senior Notes Senior Notes [Member] Entity Address, Address Line One Entity Address, Address Line One Income tax expense Income tax expense Income Tax Expense (Benefit) Customer Concentration Risk Customer Concentration Risk [Member] Cost of sales Cost of Product and Service Sold Award Timing Method Award Timing Method [Text Block] Net (decrease) increase in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forecast Forecast [Member] Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Contingent consideration maximum payment Business Combination, Contingent Consideration, Range of Outcomes, Maximum, Amount Deferred tax liability Business Combination, Recognized Liability Assumed, Deferred Tax Liability New Financial Accounting Pronouncements Accounting Standards Update and Change in Accounting Principle [Text Block] Net income Net income Net income Net Income (Loss) Attributable to Parent Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Balance Sheet Location [Axis] Location, Statement of Financial Position, Balance [Axis] Statement [Table] Statement [Table] Restatement Determination Date: Restatement Determination Date [Axis] Investment income interest Investment Income, Interest Interest on liability for sale of future revenue Imputed interest expense Purchase And Sale Agreement, Interest On Liability For Sale Of Future Revenue Purchase And Sale Agreement, Interest On Liability For Sale Of Future Revenue Schedule of Activity in Sales Rebates and Discounts Liability Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Poultry Poultry [Member] Poultry Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Prepaid expenses and other Business Combination, Recognized Asset Acquired, Prepaid Expense and Other Asset, Current Derivative Instruments and Hedging Activities Disclosure [Abstract]