Condensed Consolidated Balance Sheets - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Current Assets:
Cash, Cash Equivalents and Restricted Cash	$ 46.9	$ 86.1
Receivables [Abstract]
Trade, less Allowances of $2.7 and $2.5, respectively	204.2	208.0
Other	9.5	8.2
Net Receivables	213.7	216.2
Inventories	158.2	135.1
Prepaid and Other Current Assets	33.6	31.2
Total Current Assets	452.4	468.6
Property, Plant and Equipment	405.7	386.6
Accumulated Depreciation	(230.8)	(223.2)
Property, Plant and Equipment, Net	174.9	163.4
Operating lease assets	40.7	0.0
Goodwill	189.7	182.7
Intangible Assets, Net	156.0	146.5
Other Assets	27.0	31.3
Total Assets	1,040.7	992.5
Current Liabilities:
Current Portion of Long-Term Debt	30.1	27.0
Accounts Payable	94.9	98.4
Employee Compensation and Benefits	41.6	56.1
Other Current Liabilities	100.6	67.4
Total Current Liabilities	267.2	248.9
Long-Term Liabilities:
Long-Term Debt	330.1	328.1
Long-Term Operating Lease Liabilities	24.7	0.0
Employee-Related Benefits	20.6	21.1
Deferred Income Taxes	46.2	46.0
Other Liabilities	31.7	32.1
Total Long-Term Liabilities	453.3	427.3
Total Liabilities	720.5	676.2
Commitments and Contingencies (Note 14)
Equity:
Common Stock, $0.375 par value; 60,000,000 shares authorized; 18,160,539 and 18,125,201 shares issued and outstanding, respectively	6.8	6.8
Additional Paid-In Capital	32.0	28.5
Retained Earnings	317.7	316.3
Accumulated Other Comprehensive Loss	(38.5)	(37.2)
Total Tennant Company Shareholders' Equity	318.0	314.4
Noncontrolling Interest	2.2	1.9
Total Equity	320.2	316.3
Total Liabilities and Total Equity	1,040.7	$ 992.5
Other, Net	$ 0.2