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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2019
Jan. 31, 2020
Jun. 28, 2019
Cover page.      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
Document Transition Report false    
Entity File Number 001-16191    
Entity Registrant Name TENNANT COMPANY    
Entity Incorporation, State or Country Code MN    
Entity Tax Identification Number 41-0572550    
Entity Address, Address Line One 701 North Lilac Drive    
Entity Address, Address Line Two P.O. Box 1452    
Entity Address, City or Town Minneapolis    
Entity Address, State or Province MN    
Entity Address, Postal Zip Code 55440    
City Area Code 763    
Local Phone Number 540-1200    
Title of 12(b) Security Common Stock, par value $0.375 per share    
Trading Symbol TNC    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 1,094,534,460
Entity Common Stock, Shares Outstanding   18,349,518  
Documents Incorporated by Reference
Portions of the registrant’s Proxy Statement for its 2020 annual meeting of shareholders (the “2020 Proxy Statement”) are incorporated by reference in Part III.
    
Entity Central Index Key 0000097134    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Amendment Flag false