Dividends paid per common share (in dollars per share) Common Stock, Dividends, Per Share, Cash Paid Guarantor Obligations [Line Items] Guarantor Obligations [Line Items] Accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Statistical Measurement [Domain] Statistical Measurement [Domain] Sales direct to consumer Sales Channel, Directly to Consumer [Member] Award Timing Predetermined Award Timing Predetermined [Flag] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Judicial Ruling Judicial Ruling [Member] Total debt and equity securities, cost Debt Securities, Available-for-Sale and Equity Securities, FV-NI, Cost Debt Securities, Available-for-Sale and Equity Securities, FV-NI, Cost Entity File Number Entity File Number Additional Paid-in Capital Additional Paid-in Capital [Member] Interest rate swaps Interest Rate Swap [Member] Nonredeemable Convertible Preferred Stock Nonredeemable Convertible Preferred Stock [Member] Loss from equity method investments Loss from equity method investments Income (Loss) from Equity Method Investments Tabular List, Table Tabular List [Table Text Block] Newly Adopted Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Accounts payable Increase (Decrease) in Accounts Payable Available-for-sale debt securities, gross unrealized losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Brain Corp. Brain Corp. [Member] Brain Corp. Fed Funds Effective Rate Overnight Index Swap Rate Fed Funds Effective Rate Overnight Index Swap Rate [Member] Basic (in dollars per share) Basic earnings per share (in dollars per share) Earnings Per Share, Basic Adjustment to Compensation: Adjustment to Compensation [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Revenue Revenue from Contract with Customer [Text Block] Foreign currency fluctuations, net Goodwill, Net, Foreign Currency Fluctuations The change to the recorded net goodwill for foreign currency translation adjustments. Total other comprehensive (loss) income, net of tax Other Comprehensive Income (Loss), Net of Tax Inventory Disclosure [Abstract] Total remaining performance obligation Revenue, Remaining Performance Obligation, Amount Standard prepaid maintenance contract time period (months) Standard Prepaid Maintenance Contract, Time Period The time period of the standard prepaid maintenance contract. Adjustment to Compensation, Amount Adjustment to Compensation Amount Share-based compensation expense Share-Based Payment Arrangement, Noncash Expense Employee Stock Option Share-Based Payment Arrangement, Option [Member] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Foreign currency translation adjustments tax benefit (expense) Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax Dividends paid per common share Dividends, Common Stock, Cash Total Tennant Company shareholders' equity Equity, Attributable to Parent Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Insider Trading Policies and Procedures [Line Items] Share-based payment arrangement, expense Share-Based Payment Arrangement, Expense Common stock, shares authorized (in shares) Common Stock, Shares Authorized Hedging Designation [Domain] Hedging Designation [Domain] Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Movement in Deferred Revenue [Roll Forward] Movement in Deferred Revenue [Roll Forward] Total liabilities and total equity Liabilities and Equity Pension and Post- Retirement Medical Benefits Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Number of derivative instruments amended and extended Derivative, Number of Instruments Amended and Extended Derivative, Number of Instruments Amended and Extended Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Table] Supersedeas bond obtained Supersedeas Bond Obtained, Amount Supersedeas Bond Obtained, Amount LIABILITIES AND EQUITY Liabilities and Equity [Abstract] Cover [Abstract] Maximum Maximum [Member] Equity Method Investment [Table] Equity Method Investment [Table] Guarantees [Abstract] Accounting Policies [Abstract] Accounting Policies [Abstract] Debt Including Related Cross-currency Swap Instrument Debt Including Related Cross-currency Swap Instrument [Member] Represents debt including cross-currency swap. Total Finite-Lived Intangible Assets, Net Income Tax Contingency [Line Items] Income Tax Contingency [Line Items] Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt Instrument [Line Items] Debt Instrument [Line Items] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Pay vs Performance Disclosure [Line Items] Foreign Currency Fair Value Hedge Derivative [Line Items] Foreign Currency Fair Value Hedge Derivative [Line Items] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Acquisitions Business Combination [Text Block] Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Debt instrument, periodic payment, interest Debt Instrument, Periodic Payment, Interest Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Other liabilities Other Liabilities, Noncurrent Schedule of Long-Term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Company Selected Measure Amount Company Selected Measure Amount Foreign currency translation adjustments attributable to noncontrolling interest Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Comprehensive income attributable to Tennant Company Comprehensive Income (Loss), Net of Tax, Attributable to Parent Name Measure Name Machine warranty, period (Year) Machine Warranty Period The period for the machine warranty. Beginning balance Ending balance Restructuring Reserve Dividends payout Debt Instrument, Restrictions, Maximum, Dividends Payout Or Repurchase Of Stock The maximum amount of dividends payout or repurchase of stock allowed under the debt instrument. Maintenance Maintenance [Member] Deferred income taxes Deferred Income Tax Liabilities, Net Document Fiscal Period Focus Document Fiscal Period Focus Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Award Timing Method Award Timing Method [Text Block] Litigation Case [Domain] Litigation Case [Domain] Award Type Award Type [Axis] Deferred revenue, noncurrent Contract with Customer, Liability, Noncurrent Foreign Currency Translation Adjustments (1) Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Hedging Relationship [Domain] Hedging Relationship [Domain] Income Tax Contingency [Table] Income Tax Contingency [Table] Total assets Assets Investment, Name [Domain] Investment, Name [Domain] 2027 Finite-Lived Intangible Asset, Expected Amortization, Year One Trading Symbol Trading Symbol Geographical [Domain] Geographical [Domain] Entity Address, City or Town Entity Address, City or Town OPERATING ACTIVITIES Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Cash paid for amounts included in the measurement of lease liabilities: Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract] Weighted average original life (in years) Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life Inventories Inventory Disclosure [Text Block] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Severance-related costs Severance Costs Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Increase in deferred revenue representing our obligation to satisfy future performance obligations Increase in deferred revenue representing our obligation to satisfy future performance obligations Amount of increase in obligation to transfer good or service to customer for which consideration has been received or is receivable. Purchase price Business Combination, Consideration Transferred Decrease in deferred revenue for amounts recognized in net sales for satisfied performance obligations Contract With Customer, Liability, Performance Obligation Satisfied, Revenue Recognized Amount of revenue recognized arising from contract liability for performance obligation to be satisfied. 2030 Finite-Lived Intangible Asset, Expected Amortization, Year Four Entity Emerging Growth Company Entity Emerging Growth Company Warrant Warrant [Member] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Lease assets obtained in exchange for new operating lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Issue stock for directors, employee benefit and stock plans, net of related tax withholdings (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, Net of Tax Withholdings Shares Issued, Shares, Share-Based Payment Arrangement, Net of Tax Withholdings 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] Level 2 Fair Value, Inputs, Level 2 [Member] Equity method investments Equity Method Investments Restructuring Reserve [Roll Forward] Restructuring Reserve [Roll Forward] Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Business Combination [Domain] Business Combination [Domain] Common stock, shares outstanding (in shares) Beginning balance (in shares) Ending balance (in shares) Common Stock, Shares, Outstanding Bad debt and returns expense Accounts Receivable, Credit Loss Expense (Reversal) Schedule of Marketable Securities Marketable Securities [Table Text Block] PEO PEO [Member] Schedule of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Schedule of Investments Classified by Contractual Maturity Date Investments Classified by Contractual Maturity Date [Table Text Block] Service and other Service and Other [Member] Represents service and other. Changes in operating assets and liabilities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] 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] Schedule of Changes in Warranty Reserves Schedule of Product Warranty Liability [Table Text Block] Schedule of Estimated Aggregate Amortization Expense Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract] Retained Earnings Retained Earnings [Member] Prepaid and other current assets Prepaid Expense and Other Assets, Current Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Share-Based Payment Arrangement [Abstract] Cash and cash equivalents Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Income Statement [Abstract] Income Statement [Abstract] Derivative asset Derivative Asset Income tax expense Income Tax Expense (Benefit) Basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Cash flow hedge tax benefit (expense) Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax Beginning balance Ending balance Standard Product Warranty Accrual Intangible assets, net Carrying value Intangible Assets, Net (Excluding Goodwill) Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Designated as Hedging Instrument Designated as Hedging Instrument [Member] Product and Service [Domain] Product and Service [Domain] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Hedging Relationship [Axis] Hedging Relationship [Axis] Derivative financial instruments (net of related tax (expense) benefit of $(0.3), $0.1, $(0.5), and $0.1, respectively) Gain (Loss) Reclassified into Income Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax Tennant Company Shareholders' Equity Parent [Member] Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Total liabilities Liabilities, Fair Value Disclosure Business Combination [Table] Business Combination [Table] Derivative, notional amount Derivative, Notional Amount Schedule of Guarantor Obligations [Table] Guarantor Obligation [Table] Management Actions Restructuring and Related Activities Disclosure [Text Block] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Additions Goodwill, Acquired During Period City Area Code City Area Code Payments made in connection with business acquisition, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] All Trading Arrangements All Trading Arrangements [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Commitments and Contingencies Disclosure [Abstract] Schedule of Change in Sales Incentive Accrual Balance and Deferred Revenue Balance Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Leverage ratio minimum Debt Instrument, Covenant, Minimum Leverage Ratio For Dividends Or Repurchase Of Stock Requirement for minimum leverage ratio required to pay dividends or repurchase stock under the debt agreement. INVESTING ACTIVITIES Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Net cash (used in) provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Fair Value Hedging Fair Value Hedging [Member] Inventories carried at LIFO: LIFO Inventory [Member] Represents LIFO inventory. Equity Method Investments and Joint Ventures [Abstract] Subsequent Event Subsequent Event [Member] Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Equity Securities, FV-NI Equity securities, fair value Equity Securities, FV-NI Cash Flow Hedging Cash Flow Hedging [Member] Goodwill Beginning balance, net Ending balance, net Goodwill Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] PEO Total Compensation Amount PEO Total Compensation Amount Long-Term Debt, Type [Axis] Long-Term Debt, Type [Axis] Depreciation expense Depreciation Remaining 2026 Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year Equity Components [Axis] Equity Components [Axis] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Credit facility Line Of Credit Facility, Additional Borrowings Option The amount of option to increase the maximum borrowing capacity of the line of credit facility. Number of reportable segments Number of Reportable Segments SUPPLEMENTAL CASH FLOW INFORMATION Supplemental Cash Flow Information [Abstract] Available-for-sale debt securities, cost Total debt securities Debt Securities, Available-for-Sale, Amortized Cost Equipment Equipment Sales [Member] Represents equipment sales. Beginning balance, accumulated impairment losses Ending balance, accumulated impairment losses Goodwill, Impaired, Accumulated Impairment Loss Other Performance Measure, Amount Other Performance Measure, Amount Inventory [Line Items] Inventory [Line Items] Current portion of long-term debt Less: current portion of long-term debt Debt, Current Entity Address, State or Province Entity Address, State or Province Unused borrowing capacity Debt Instrument, Unused Borrowing Capacity, Amount Total current liabilities Liabilities, Current Other Current Liabilities Other Current Liabilities [Member] Inventory [Axis] Inventory [Axis] Litigation Status [Axis] Litigation Status [Axis] Derivative Instrument [Axis] Derivative Instrument [Axis] Individual: Individual [Axis] Variable Rate Component [Domain] Variable Rate Component [Domain] Variable Rate Component [Domain] Lease assets obtained in exchange for new financing lease liabilities Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Net cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Remaining performance obligation, expected timing of satisfaction period Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 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] Cash paid for interest Interest Paid, Excluding Capitalized Interest, Operating Activity Document Fiscal Year Focus Document Fiscal Year Focus Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Operating lease assets Operating Lease, Right-of-Use Asset Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Entity Interactive Data Current Entity Interactive Data Current Sales Incentives Sales Incentives [Member] Represents sales incentives. Incremental accrued expense and corresponding liability Loss Contingency, Incremental Accrued Expense and Liability Loss Contingency, Incremental Accrued Expense and Liability Movement in Deferred Sales Inducements [Roll Forward] Movement in Deferred Sales Inducements [Roll Forward] Segment Reporting Segment Reporting Disclosure [Text Block] Derivatives not designated as hedging instruments: Not Designated as Hedging Instrument [Member] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Warranty Product Warranty Disclosure [Text Block] Total debt Carrying value of total debt Debt and Lease Obligation Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Amortization expense Amortization expense Amortization of Intangible Assets Selling and administrative expense Selling, General and Administrative Expense Permitted acquisitions Debt Instrument, Covenant, Minimum Permitted Acquisition Alternative, Requirements For Indebtedness To EBITDA Ratio The minimum amount of permitted acquisition to have alternative requirements for the indebtedness to EBITDA ratio under the covenant of the debt instrument. Schedule of Accumulated Other Comprehensive Loss, Net of Tax Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Other assets Other Assets, Noncurrent Movement in Standard Product Warranty Accrual [Roll Forward] Movement in Standard Product Warranty Accrual [Roll Forward] Entity Central Index Key Entity Central Index Key Other comprehensive (loss) income: Other Comprehensive Income (Loss), before Tax [Abstract] PEO Name PEO Name Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 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] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Cross-currency swaps Currency Swap [Member] Finished goods Inventory, Finished Goods, Gross Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Revolving credit facility borrowings Revolving Credit Facility [Member] Finance lease liabilities Finance Lease, Liability Arrangement Duration Trading Arrangement Duration Deferred revenue, current Contract with Customer, Liability, Current Schedule of Fair Value of Derivative Instruments Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Local Phone Number Local Phone Number Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Inventory, Current [Table] Inventory, Current [Table] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Share-Based Compensation Share-Based Payment Arrangement [Text Block] ASSETS Assets [Abstract] Credit Facility [Axis] Credit Facility [Axis] Underlying Security Market Price Change Underlying Security Market Price Change, Percent 2029 Finite-Lived Intangible Asset, Expected Amortization, Year Three Foreign currency fluctuations, accumulated impairment losses Accumulated Impairment, Losses, Foreign Currency Fluctuations The change to the recorded value of accumulated impairment losses for foreign currency translation adjustments. Balance Sheet Location [Axis] Statement of Financial Position Location, Balance [Axis] Debt Instrument [Axis] Debt Instrument [Axis] Fair Value Measurements Fair Value Disclosures [Text Block] Nonredeemable Preferred Stock Nonredeemable Preferred Stock [Member] Business Combination [Line Items] Business Combination [Line Items] Credit Facility [Domain] Credit Facility [Domain] Original cost Finite-Lived Intangible Assets, Gross Other Current Liabilities Derivative Liability, Current 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] Entity Address, Address Line One Entity Address, Address Line One Research and development expense Research and Development Expense Accumulated Other Comprehensive Loss Total AOCI Attributable to Parent [Member] Investment, Name [Axis] Investment, Name [Axis] Allowance for credit loss Accounts Receivable, Allowance for Credit Loss, Current Investments [Domain] Investments [Domain] Raw materials and work-in-process Inventory, Work in Process and Raw Materials Shares withheld for taxes (in shares) Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation Long-term operating lease liabilities Operating Lease, Liability, Noncurrent Reinigungstechnik 4 You GmbH Reinigungstechnik 4 You GmbH [Member] Reinigungstechnik 4 You GmbH Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract] Derivatives Derivative Instruments and Hedging Activities Disclosure [Text Block] Americas Americas [Member] Other Assets Derivative Asset, Subject to Master Netting Arrangement, before Offset Other Liabilities Other Liabilities [Member] Fair Value as of Grant Date Award Grant Date Fair Value Entity Registrant Name Entity Registrant Name Derivate gains to be reclassified within the next twelve months Cash Flow Hedge Gain (Loss) to be Reclassified within 12 Months Thereafter Finite-lived Intangible Asset, Expected Amortization After Year Four Amount of amortization for asset, excluding financial asset and goodwill, lacking physical substance with finite life expected to be recognized after fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Customer Lists Customer Lists [Member] Effect of dilutive securities (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Document Quarterly Report Document Quarterly Report Foreign currency forward contracts Foreign Currency Contract, Asset, Fair Value Disclosure Total assets Assets, Fair Value Disclosure Deferred income tax expense (benefit) Deferred Income Taxes and Tax Credits Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Number of operating segments Number of Operating Segments Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Claims paid Standard Product Warranty Accrual, Decrease for Payments Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Schedule of Debt Outstanding Schedule of Debt [Table Text Block] Investment Type [Axis] Investment Type [Axis] Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Schedule of Balances of Acquired Intangible Assets, Excluding Goodwill Schedule of Finite-Lived Intangible Assets [Table Text Block] Restatement Determination Date: Restatement Determination Date [Axis] Non-PEO NEO Non-PEO NEO [Member] Letters of credit outstanding Letters of Credit Outstanding, Amount Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Schedule of Pre-tax Restructuring Charges Restructuring and Related Costs [Table Text Block] Foreign currency translation adjustments attributable to noncontrolling interests Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Noncontrolling Interest Cash paid for income taxes Income Taxes Paid (Received) Income Taxes Paid (Received) Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Amounts reclassified from accumulated other comprehensive loss Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Available-for-sale debt securities, gross unrealized gains Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Name Trading Arrangement, Individual Name All Award Types Award Type [Domain] Noncontrolling interest Equity, Attributable to Noncontrolling Interest Equity Awards Adjustments Equity Awards Adjustments [Member] Other, net Other Noncash Income (Expense) Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Compensation Amount Outstanding Recovery Compensation Amount Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Pension and postretirement medical benefits, tax expense Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Employee compensation and benefits Increase (Decrease) in Employee Related Liabilities MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Name Awards Close in Time to MNPI Disclosures, Individual Name AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] Cash payments Payments for Restructuring Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Foreign Exchange Option Foreign Exchange Option [Member] After 5 years through 10 years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Inventory [Domain] Inventory [Domain] Share-based compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Adjusted Secured Overnight Financing Rate Adjusted Secured Overnight Financing Rate [Member] Adjusted Secured Overnight Financing Rate Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Long-term debt Long-Term Debt and Lease Obligation Beginning balance Ending balance Goodwill, Gross Financial Instruments [Domain] Financial Instruments [Domain] Litigation Case [Axis] Litigation Case [Axis] Foreign currency fluctuations Standard Product Warranty Accrual, Foreign Currency Translation Gain (Loss) Europe, Middle East and Africa EMEA [Member] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Schedule of Recognition of Net Sales in Future Periods Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Balance Sheet Location [Domain] Statement of Financial Position Location, Balance [Domain] Inventories Increase (Decrease) in Inventories Inventories Total inventories Inventory, Net Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Minimum Minimum [Member] Investment in leased assets Payment for Acquisition, Lease, Held-for-Investment Unrealized Gain (Loss) on Debt Securities AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member] Sales to distributors Sales Channel, Through Intermediary [Member] Accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Company Selected Measure Name Company Selected Measure Name Other Liabilities Derivative Liability, Subject to Master Netting Arrangement, Asset Offset Debt Debt Disclosure [Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Accounts payable Accounts Payable, Current Additions charged to expense Standard Product Warranty Accrual, Increase for Warranties Issued Operating cash flows from operating leases Operating Lease, Payments Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Fair Value Debt Securities, Held-to-Maturity, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract] All Executive Categories All Executive Categories [Member] Stockholders' Equity Note [Abstract] Common Stock, $0.375 par value; 60,000,000 shares authorized; 17,049,303 and 17,846,681 shares issued and outstanding, respectively Common Stock, Value, Issued Goodwill [Roll Forward] Goodwill [Roll Forward] Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Voting interest, percentage Equity Method Investment, Voting Interest Equity Method Investment, Voting Interest Variable Rate Component [Axis] Variable Rate Component [Axis] Variable Rate Component Diluted (in shares) Diluted - weighted average shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted Commitments and contingencies (Note 13) Commitments and Contingencies Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Business Combination [Axis] Business Combination [Axis] Total comprehensive income including noncontrolling interest Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Entity Small Business Entity Small Business Business acquisition, percentage of voting interests acquired Business Combination, Voting Equity Interest Acquired, Percentage Income Tax Disclosure [Abstract] Noncontrolling Interest Noncontrolling Interest [Member] Total debt and equity securities, fair value Debt Securities, Available-for-Sale and Equity Securities, FV-NI Debt Securities, Available-for-Sale and Equity Securities, FV-NI Commitment fees on unused lines of credit Line of Credit Facility, Commitment Fee Amount Document Transition Report Document Transition Report Ownership, percentage Equity Method Investment, Ownership Percentage Significant Accounting Policies Accounting Standards Update and Change in Accounting Principle [Text Block] Numerator: Net Income (Loss) Available to Common Stockholders, Basic [Abstract] Underlying Securities Award Underlying Securities Amount Equity Component [Domain] Equity Component [Domain] Document Period End Date Document Period End Date PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Income Taxes Income Tax Disclosure [Text Block] Denominator: Earnings Per Share, Diluted [Abstract] Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Revenue from Contract with Customer [Abstract] Hedging Designation [Axis] Hedging Designation [Axis] Fair value of total debt Debt Instrument, Fair Value Disclosure Total LIFO inventories LIFO Inventory Amount Total equity Beginning balance Ending balance Equity, Including Portion Attributable to Noncontrolling Interest Inventories carried at FIFO: FIFO Inventory [Member] Represents FIFO inventory. Document Type Document Type Level 3 Fair Value, Inputs, Level 3 [Member] Income Attributable to Tennant Company Per Share Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Loss Contingencies [Table] Loss Contingencies [Table] Additional paid-in capital Additional Paid in Capital Pension and postretirement medical benefits (net of related tax expense of $0, $0, $0, and $0, respectively) Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Product and Service [Axis] Product and Service [Axis] Net Investment Hedging Net Investment Hedging [Member] Derivative Contract [Domain] Derivative Contract [Domain] Derivative, EUR-USD exchange rate Derivative, Exchange Rate Derivative, Exchange Rate Repurchases from exercise of stock options, net of employee tax withholdings obligations of $3.2 and $2.9, respectively Proceeds from Issuance of Common Stock Net sales Revenue from Contract with Customer, Excluding Assessed Tax Litigation Status [Domain] Litigation Status [Domain] Cross-currency swap instruments, net Debt, Weighted Average Interest Rate, Net, Of Currency Swap Contract Weighted average interest rate of debt outstanding, net of currency swap contract. Maximum EBITDA to interest expense ratio Debt Instrument, Covenant, EBITDA to Interest Expense Ratio, Maximum Debt Instrument, Covenant, EBITDA to Interest Expense Ratio, Maximum All Individuals All Individuals [Member] Long-Term Debt, Type [Domain] Long-Term Debt, Type [Domain] Fair Value Disclosures [Abstract] Purchases of property, plant and equipment Payments to Acquire Property, Plant, and Equipment Name Forgone Recovery, Individual Name Adjustments to accrual Restructuring Reserve, Accrual Adjustment Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] 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] Contract payments Contract With Customer, Liability, Contract Payments The amount of decrease in contract with customer liability from contract payments. Weighted average cost of debt Debt, Weighted Average Interest Rate Fixed interest rate Derivative, Fixed Interest Rate Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Foreign currency fluctuations Goodwill, Foreign Currency Translation, Gain (Loss) Employee tax withholdings obligations Payment, Tax Withholding, Share-Based Payment Arrangement Cost Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract] Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Schedule of Derivative Instruments Schedule of Derivative Instruments [Table Text Block] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Schedule of Finite-Lived Intangible Assets [Table] Intangible Asset, Finite-Lived [Table] Beginning balance Ending balance Contract with Customer, Refund Liability Other comprehensive loss Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Geographical [Axis] Geographical [Axis] Schedule of Effects of Derivatives Designated as Hedging Instruments Derivative Instruments, Gain (Loss) [Table Text Block] Other assets and liabilities Increase (Decrease) in Other Operating Assets and Liabilities, Net Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Level 1 Fair Value, Inputs, Level 1 [Member] Net foreign currency transaction loss Gain (Loss), Foreign Currency Transaction, before Tax Asia Pacific Asia Pacific [Member] Diluted (in dollars per share) Diluted earnings per share (in dollars per share) Earnings Per Share, Diluted Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Receivables, less allowances of $10.9 and $10.4, respectively Accounts Receivable, after Allowance for Credit Loss, Current Title of 12(b) Security Title of 12(b) Security Supplemental non-cash investing and financing activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] After 5 years through 10 years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Net income per share Earnings Per Share [Abstract] Earnings Per Share [Abstract] Contract with Customer, Sales Channel [Domain] Contract with Customer, Sales Channel [Domain] Equity Method Investments Equity Method Investments and Joint Ventures Disclosure [Text Block] Gross profit Gross Profit Total pre-tax restructuring costs Restructuring Charges Including Accrual Adjustments Restructuring Charges Including Accrual Adjustments Repurchases of common stock, including excise tax Stock Repurchased and Retired During Period, Value Contract with Customer, Sales Channel [Axis] Contract with Customer, Sales Channel [Axis] Variable rate floor Debt Instrument, Variable Rate, Floor The floor rate of the variable rate of the debt instrument. 2028 Finite-Lived Intangible Asset, Expected Amortization, Year Two Award Timing Disclosures [Line Items] Schedule of Inventories Schedule of Inventory, Current [Table Text Block] Revolving credit facility borrowings Long-Term Debt, Gross Employee compensation and benefits Employee-related Liabilities, Current Foreign currency fluctuations Restructuring Reserve, Foreign Currency Translation Gain (Loss) Other comprehensive (loss) income before reclassifications Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Foreign Currency Fair Value Hedge Derivative [Table] Foreign Currency Fair Value Hedge Derivative [Table] Property, plant and equipment, less accumulated depreciation of $301.7 and $289.0, respectively Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization Shareholders' Equity Equity [Text Block] Trade Names Trade Names [Member] Net income Net income Net Income (Loss) Attributable to Parent Subsequent Event [Table] Subsequent Event [Table] Expiration Date Trading Arrangement Expiration Date Total FIFO inventories FIFO Inventory Amount New charges Restructuring Charges Repurchases of common stock Payments for Repurchase of Common Stock Adoption Date Trading Arrangement Adoption Date Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Receivables Increase (Decrease) in Accounts Receivable Entity Current Reporting Status Entity Current Reporting Status EBITDA ratio, maximum Debt Instrument, Covenant, Senior Secured Net Indebtedness To Adjusted EBITDA Ratio, Maximum The maximum senior secured net indebtedness to adjusted EBITDA ratio allowed under the covenant of the debt instrument. Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Operating income Operating Income (Loss) Line of Credit Line of Credit [Member] Excess of FIFO over LIFO cost Inventory, LIFO Reserve Redeemable Preferred Stock Redeemable Preferred Stock [Member] Retained earnings Retained Earnings (Accumulated Deficit) The 2021 Credit Agreement The 2021 Credit Agreement [Member] Represents the 2021 credit agreement. Financial Instrument [Axis] Financial Instrument [Axis] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] 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] Executive Category: Executive Category [Axis] Foreign currency forward contracts Foreign currency forward contracts Foreign Exchange Forward [Member] Parts and consumables Parts and Consumables [Member] Represents parts and consumables. Variable Rate Component One Variable Rate Component One [Member] Variable Rate Component One Repayments of borrowings Repayments of Debt Cash received from leased assets Cash received from leased assets Cash inflows received from leased assets. Loss contingency accrual Loss Contingency, Accrual, Current Finance lease liabilities current Finance Lease, Liability, Current Proceeds from borrowings Proceeds from Issuance of Long-Term Debt Current Fiscal Year End Date Current Fiscal Year End Date Technology Technology-Based Intangible Assets [Member] Derivative Financial Instruments Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Additions to sales incentive accrual Additions to sales incentive accrual The increase (decrease) in contract with customer liability for sales incentive accruals. Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] 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] Oxygenator Water Techs vs. Tennant Company Oxygenator Water Techs vs. Tennant Company [Member] Oxygenator Water Techs vs. Tennant Company Statement [Table] Statement [Table] Other expense, net Other Nonoperating Income (Expense) Derivative liability Derivative Liability Effect of exchange rate changes on cash and cash equivalents Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation Adjustments to reconcile net income to net cash used in operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] FINANCING ACTIVITIES Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Issue stock for directors, employee benefit and stock plans, net of related tax withholdings Shares Issued, Value, Share-Based Payment Arrangement, Net of Tax Withholdings Shares Issued, Value, Share-Based Payment Arrangement, Net of Tax Withholdings Variable Rate [Domain] Variable Rate [Domain] Beginning balance Ending balance Contract with Customer, Liability Schedule of Assets and Liabilities Subject to Fair Value Measurements Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Unrecognized tax benefits, ending balance Unrecognized Tax Benefits Antidilutive securities (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Weighted average shares outstanding Weighted Average Number of Shares Outstanding, Diluted [Abstract] All Adjustments to Compensation All Adjustments to Compensation [Member] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Amendment Flag Amendment Flag Share-based payment arrangement, tax benefit Share-Based Payment Arrangement, Expense, Tax Benefit Foreign currency fluctuations Foreign currency fluctuations The amount of increase (decrease) in contract with customer liability from the impact of foreign currency. Termination Date Trading Arrangement Termination Date Net cash provided by (used in) financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Measure: Measure [Axis] Nature of Business Basis of Presentation and Significant Accounting Policies [Text Block] Unrecognized tax benefits, income tax penalties and interest accrued, total Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Basic (in shares) Basic - weighted average shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Cost of sales Cost of Product and Service Sold Unrecognized tax benefits Unrecognized Tax Benefits that Would Impact Effective Tax Rate Schedule of Computations of Basic and Diluted Earnings per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Open tax year, term (year) Open Tax Year Term Open term for open tax year. Subsequent Events [Abstract] Segment Reporting [Abstract] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Debt Disclosure [Abstract] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount The 2024 Credit Agreement The 2024 Credit Agreement [Member] Represents the 2024 credit agreement. Entity Tax Identification Number Entity Tax Identification Number Restructuring and Related Activities [Abstract] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, shares issued (in shares) Common Stock, Shares, Issued Goodwill and Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Financing cash flows from financing leases Finance Lease, Interest Payment on Liability Dividends paid Payments of Dividends Schedule of Changes in the Carrying Amount of Goodwill Schedule of Goodwill [Table Text Block] Interest expense, net Interest Expense, Nonoperating Trading Arrangement: Trading Arrangement [Axis] Other Current Assets Derivative Asset, Current Other Noncontrolling Interest, Other Noncontrolling Interest, Other Total Shareholder Return Amount Total Shareholder Return Amount Loss Contingencies [Line Items] Loss Contingencies [Line Items] Subsequent Events Subsequent Events [Text Block] Foreign currency translation adjustments (net of related tax (expense) benefit of $(0.2), $1.7, $(0.5), and $1.9, respectively) Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Insider Trading Arrangements [Line Items] Security Exchange Name Security Exchange Name Variable Rate Component Two Variable Rate Component Two [Member] Variable Rate Component Two Clean Machine Clean Machine [Member] Clean Machine Total long-term liabilities Liabilities, Noncurrent Total liabilities Liabilities Commitment fee (as a percent) Line of Credit Facility, Commitment Fee Percentage Capital expenditures in accounts payable Capital Expenditures Incurred but Not yet Paid Gain (Loss) Recognized in Accumulated Other Comprehensive Loss, net of tax Investment Income, Net Credit facility Line of Credit Facility, Maximum Borrowing Capacity Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Repurchases of common stock (in shares) Stock Repurchased During Period, Shares Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Other current liabilities Other Liabilities, Current Statement [Line Items] Statement [Line Items] Variable Rate [Axis] Variable Rate [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Schedule of Reconciliation of Liability Balance of Severance and Related Costs Schedule of Restructuring Reserve by Type of Cost [Table Text Block] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Subsequent Event [Line Items] Subsequent Event [Line Items] Common Stock Common Stock [Member] Debt securities Available-for-sale debt securities, fair value Total debt securities Debt Securities, Available-for-Sale Employee benefits Employee-related Liabilities Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Adjusted Risk Free Rate Adjusted Risk Free Rate [Member] Adjusted Risk Free Rate Net decrease in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation