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Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities Diversified investments associated with the ESU program, current Diversified investments associated with the Executive Stock Unit Program, Current Diversified investments associated with the Executive Stock Unit Program, Current Wages and commissions payable Accrued Salaries, Current Income Tax Examination [Table] Income Tax Examination [Table] Percentage of award intended to pay out in stock Share Based Compensation Arrangement By Share Based Payment Award Percentage Paid Out In Stock Share-based Compensation Arrangement by Share-based Payment Award, Percentage Paid Out in Stock Diversified investments associated with the ESU program, total Diversified investments associated with the Executive Stock Unit Program Diversified investments associated with the Executive Stock Unit Program Schedule of Costs of Retirement Plans Schedule of Costs of Retirement Plans [Table Text Block] Derivative 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Arrangements, Liability, Current and Noncurrent Other intangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table] Income Tax Examination [Line Items] Income Tax Examination [Line Items] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Fair Value Fair Value Disclosures [Text Block] Trading Symbol Trading Symbol Entity File Number Entity File Number Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Stock-based retirement plans contributions Stock Based Retirement Plans Contributions [Member] Stock Based Retirement Plans Contributions [Member] 2026 Finite-Lived Intangible Asset, Expected Amortization, Year Four PSU Psu [Member] PSU [Member] 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Contributions, Next Fiscal Year Award Year 2019, PSU - EBIT CAGR Three Year Performance Cycle Award Year Two Thousand Nineteen, PSU EBIT CAGR [Member] Three Year Performance Cycle Award Year Two Thousand Nineteen, PSU EBIT CAGR Customer-related intangibles Customer Related [Member] Customer - Related Member. Estimates Use of Estimates, Policy [Policy Text Block] Acquisitions Business Combination Disclosure [Text Block] Other Nonoperating Income (Expense) [Abstract] Other Nonoperating Income (Expense) [Abstract] Performance Stock Unit Awards - TSR Based Performance Stock Unit Awards - TSR Based [Member] Performance Stock Unit Awards - TSR Based [Member] Accounts payable Increase (Decrease) in Accounts Payable Schedule of Variable Interest Entities [Table] Schedule of Variable Interest Entities [Table] Deferred income taxes Deferred Income Taxes [Member] Deferred Income Taxes [Member] Income Taxes Income Tax Disclosure [Text Block] Weighted average interest rate Debt, Weighted Average Interest Rate Value-added taxes recoverable Value Added Tax Receivable, Current Finished goods Inventory, Finished Goods, Net of Reserves Money market funds, cash and other Defined Benefit Plan, Cash and Cash Equivalents [Member] Credit Facility [Domain] Credit Facility [Domain] Total liabilities associated with stock-based compensation, current Deferred Compensation Liability, Current Senior Notes, Due 2027 Senior Notes, Due 2027 [Member] Senior Notes, Due 2027 [Member] Basic (in dollars per share) Basic EPS attributable to Leggett & Platt, Inc. common shareholders (in dollars per share) Earnings Per Share, Basic Reclassifications, pretax Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax Revenues from External Customers and Long-Lived Assets [Line Items] Revenues from External Customers and Long-Lived Assets [Line Items] Erosion Control And Geosynthetic Products Erosion Control And Geosynthetic Products [Member] Erosion Control And Geosynthetic Products Average current liabilities included in segment numbers above Corporate, Non-Segment [Member] Total liabilities associated with stock-based compensation, total Deferred Compensation Liability, Current and Noncurrent Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Other long-term liabilities Subsidiary Other Long-term Liabilities [Abstract] Subsidiary Other Long-term Liabilities [Abstract] Net actuarial loss Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax Discount market price purchase date, percentage Share Based Compensation Arrangement By Share Based Payment Award Discount Market Price Purchase Date Share based compensation arrangement by share based payment award discount market price purchase date. Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Entity Interactive Data Current Entity Interactive Data Current Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Fair Value over Carrying Value divided by Carrying Value Percentage Of Fair Value In Excess Of Carrying Percentage Of fair Value In excess Of Carrying Value Percentage Of Fair Value In Excess Of Carrying Percentage Of Fair Value In excess Of Carrying Value Schedule of Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Increases/decreases in, excluding effects from acquisitions and divestitures: Increase (Decrease) in Operating Capital [Abstract] Change in uncertain tax positions, net Effective Income Tax Rate Reconciliation, Tax Contingency, Percent Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] 2027 Finance Lease, Liability, to be Paid, Year Five Converter And Distributer Of 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Active Plans Active Plans [Member] Active Plans [Member] Net operating losses and other tax carryforwards Net Operating Loss And Tax Credit Carryforwards [Member] Net Operating Loss And Tax Credit Carryforwards [Member] Notes Receivable Notes Receivable [Member] 2024 Long-Term Debt, Maturity, Year Two Diversified investments associated with the ESUP Investments, Fair Value Disclosure Acquisitions Business Combinations Policy [Policy Text Block] Plan amendments Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment Allowance for doubtful accounts - other notes receivable Other Receivable, Allowance For Credit Loss, Noncurrent Other Receivable, Allowance For Credit Loss, Noncurrent Less: additional consideration (receivable) Business Combination, Recognized Identifiable Assets Acquired, Additional Consideration Receivable Business Combination, Recognized Identifiable Assets Acquired, Additional Consideration Receivable Liabilities associated with the ESUP Liabilities Associated With Esup [Member] Liabilities associated with esup [Member] Less: current maturities Long-Term Debt and Lease Obligation, Current Maximum borrowing capacity Total program authorized Line of Credit Facility, Maximum Borrowing Capacity Receivable [Domain] Receivable [Domain] Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Deductions SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction Restructuring reserve Restructuring Reserve Deferred Tax Assets And (Liabilities) Included In Consolidated Balance Sheets Deferred Tax Assets And (Liabilities) Included In Consolidated Balance Sheets [Table Text Block] Deferred Tax Assets And Liabilities Included In Consolidated Balance Sheets Other, net Payments for (Proceeds from) Other Investing Activities Statistical Measurement [Domain] Statistical Measurement [Domain] Additions to long-term debt Proceeds from Issuance of Debt Maturities of Long-term Debt [Abstract] Maturities of Long-Term Debt 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facilities Number Of Manufacturing Facilities Number Of Manufacturing Facilities Vested (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value, Prior to Plan Modification Share-based Compensation Arrangements by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value, Prior to Plan Modification Schedule of Allocation of Plan Assets Schedule of Allocation of Plan Assets [Table Text Block] 2023 Lessee, Operating Lease, Liability, to be Paid, Year One Term notes Medium-term Notes [Member] Financial Instrument [Axis] Financial Instrument [Axis] Award Year 2018, PSU - EBIT CAGR Three Year Performance Cycle Award Year Two Thousand Eighteen, PSU EBIT CAGR [Member] Three Year Performance Cycle Award Year Two Thousand Eighteen, PSU EBIT CAGR 2025 Long-Term Debt, Maturity, Year Three SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] Consolidation Items [Domain] Consolidation Items [Domain] Document Period End Date Document Period End Date To Be Settled With Stock Settled with Stock [Member] Settled with Stock [Member] Excess of without planned expenditures Debt Instrument, Debt Covenant, Cash Balance, Minimum Balance Debt Instrument, Debt Covenant, Cash Balance, Minimum Balance Less than 50% Less Than 50 Percent [Member] Less Than 50 Percent [Member] Deemed repatriation tax payable Repatriation Tax Payable, Noncurrent Repatriation Tax Payable, Noncurrent Unusual or Infrequent Item, or Both [Axis] Unusual or Infrequent Item, or Both [Axis] Performance Stock Unit (EBIT) award Performance Stock Unit Awards EBIT [Member] Performance Stock Unit Awards EBIT [Member] Changes in Each Component of Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] TOTAL ASSETS Assets Assets Net earnings per share attributable to Leggett & Platt, Inc. common shareholders Earnings Per Share [Abstract] Other permanent differences, net Effective Income Tax Rate Reconciliation Permanent Differences Effective Income Tax Rate Reconciliation Permanent Differences Performance Shares Performance Shares [Member] Schedule of Restructuring and Related Costs [Table] Schedule of Restructuring and Related Costs [Table] 2027 Lessee, Operating Lease, Liability, to be Paid, Year Five Fixed rate debt Long-Term Debt, Fair Value Earnings before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Segments [Domain] Segments [Domain] Schedule of Goodwill [Table] Schedule of Goodwill [Table] Earnings Per Share Earnings Per Share [Text Block] Schedule of Amounts Outstanding Related to Commercial Paper Program Schedule of Short-Term Debt [Table Text Block] Flexible Stock Plan Flexible Stock Plan [Member] Flexible Stock Plan [Member] Liabilities associated with stock-based compensation plans (see Note L) Total liabilities associated with stock-based compensation, long-term Deferred Compensation Liability, Classified, Noncurrent Gross goodwill Goodwill, Gross Disposed of by sale Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Tax on undistributed earnings (primarily from Canada and China) Tax on Undistributed Earnings [Member] Tax on Undistributed Earnings [Member] Derivative financial instruments Derivative Financial Instruments, Assets [Member] Award Type [Domain] Award Type [Domain] Income Tax Contingency [Table] Income Tax Contingency [Table] EBIT CAGR Based Earnings Before Interest and Taxes And Compound Annual Growth Rate [Member] Earnings Before Interest and Taxes And Compound 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employee purchase net of discount. Domestic Income (Loss) from Continuing Operations before Income Taxes, Domestic Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Cumulative effect adjustment Cumulative Effect, Period of Adoption, Adjustment [Member] Discount rate used in net pension costs Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Other comprehensive income (loss) Other Comprehensive Income (Loss), before Reclassifications, before Tax Non-service pension (income) expense Non-Service Pension Income (Expense) Non-Service Pension Income (Expense) Operating Leases, Schedule of Future Minimum Payments Lessee, Operating Lease, Liability, Maturity [Table Text Block] Entity Address, Address Line One Entity Address, Address Line One Income tax effect Other Comprehensive Income (Loss), Tax Product and Service [Axis] Product and Service [Axis] Class of Stock [Domain] Class of Stock [Domain] Other current and long-term assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Interest expense Interest Expense Retirement Plan Type [Axis] Retirement Plan Type [Axis] Cash and Cash Equivalents [Domain] Cash and Cash Equivalents [Domain] Schedule of Long-Term Debt, Weighted Average Interest Rates And Due Dates Schedule of Long-Term Debt Instruments [Table Text Block] Machinery and equipment Machinery and Equipment [Member] Buildings Building [Member] Net funded status Defined Benefit Plan, Funded (Unfunded) Status of Plan Income Tax Authority, Name [Domain] Income Tax Authority, Name [Domain] Other Other Deferred Tax Assets Liabilities [Member] Other Deferred Tax Assets Liabilities [Member] Reclassifications Reclassification, Comparability Adjustment [Policy Text Block] Liabilities Deferred Tax Liabilities, Gross Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Non-compete agreements, supply agreements and other Noncompete Agreements Noncompete Agreements [Member] Dividends payable Dividends Payable, Current Plan participants’ contributions Defined Benefit Plan, Plan Assets, Contributions by Plan Participant Operating cash flows from finance leases Finance Lease, Interest Payment on Liability Granted based on current service (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Based on Current Service Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Based on Current Service Dilutive effect of equity-based compensation (in shares) Weighted Average Number of Shares Outstanding, Diluted, Adjustment Valuation And Qualifying Accounts And Reserves SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] Weighted average assumptions for pension costs: Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] Commercial paper Commercial Paper [Member] 2027 Finite-Lived Intangible Asset, Expected Amortization, Year Five Property, plant and equipment acquired through finance leases Noncash or Part Noncash Acquisition, Fixed Assets Acquired Fair Value by Measurement Frequency [Axis] Measurement Frequency [Axis] Allowance for doubtful receivables SEC Schedule, 12-09, Allowance, Credit Loss [Member] Weighted Average Grant Date Fair Value per Unit Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Deferred costs Unusual Or Infrequent Item, Or Both, Deferred Social Security Employer Match Unusual Or Infrequent Item, Or Both, Deferred Social Security Employer Match Other Other Accrued Liabilities, Current Type of Adoption [Domain] Accounting Standards Update [Domain] Net (loss) gain (before tax) beginning balance Net (loss) gain (before tax) ending balance Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Retirement Benefits [Abstract] Retirement Benefits [Abstract] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Financing Activities Net Cash Provided by (Used in) Financing Activities [Abstract] Diversified investments associated with stock-based compensation plans (see Note L) Diversified investments associated with the ESU program, long-term Diversified investments associated with the Executive Stock Unit Program, Noncurrent Diversified investments associated with the Executive Stock Unit Program, Noncurrent Less: interest Finance Lease, Liability, Undiscounted Excess Amount Disposal Group Classification [Domain] Disposal Group Classification [Domain] Impairments Total Impairments Asset Impairment Charges Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Less: Net Charge-offs/(Recoveries) and Other Allowance For Doubtful Accounts Write Offs Against Allowance Net Of Recoveries and Other Allowance for Doubtful Accounts, Write Offs Against Allowance Net of Recoveries and Other Cost of goods sold Cost of Sales [Member] Derivative liability, noncurrent Derivative Liability, Noncurrent Accounting standards update [Extensible List] Accounting Standards Update [Extensible Enumeration]