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Acquisitions (Details 4) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Net Sales                      
Net Sales $ 294,800,000 $ 280,700,000 $ 299,700,000 $ 262,500,000 $ 285,200,000 $ 273,300,000 $ 292,200,000 $ 272,800,000 $ 1,137,600,000 $ 1,123,500,000 $ 1,003,100,000
Net Earnings (Loss) Attributable to Tennant Company                      
As reported $ 10,900,000 $ 14,600,000 $ 14,800,000 $ 5,400,000 $ 7,700,000 $ 9,700,000 $ 12,700,000 $ 3,300,000 $ 45,800,000 $ 33,400,000 $ (6,200,000)
Net Earnings (Loss) Attributable to Tennant Company per Diluted Share                      
As reported (in dollars per share) $ 0.59 $ 0.79 $ 0.81 $ 0.29   $ 0.52 $ 0.69 $ 0.18 $ 2.48 $ 1.82 $ (0.35)
IP Cleaning S.p.A                      
Net Sales                      
Pro forma                     $ 1,057,100,000
Net Earnings (Loss) Attributable to Tennant Company                      
Pro forma                     $ 12,300,000
Net Earnings (Loss) Attributable to Tennant Company per Diluted Share                      
Pro forma (in dollars per share)                     $ 0.68