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Note 3 - Revenue - Contract Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Sales Incentives [Member]
Beginning balance	$ 13.7	$ 16.7
Additions to sales incentive accrual	18.2	24.7
Contract payments	(20.0)	(27.7)
Foreign currency fluctuations	0.2	0.0
Ending balance	12.1	13.7
Maintenance [Member]
Foreign currency fluctuations	(0.6)	0.0
Beginning balance	10.7	8.5
Increase in deferred revenue representing our obligation to satisfy future performance obligations	21.0	26.0
Deferred revenue acquired from acquisition of Gaomei Cleaning Equipment Company	0.0	1.4
Decrease in deferred revenue for amounts recognized in net sales for satisfied performance obligations	(21.8)	(25.2)
Ending balance	$ 9.3	$ 10.7

X

- Definition

The amount of decrease in contract with customer liability from contract payments.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of increase (decrease) in contract with customer liability from the impact of foreign currency.

+ References

No definition available.

+ Details

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X

- Definition

The increase (decrease) in contract with customer liability for sales incentive accruals.

+ References

No definition available.

+ Details

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Namespace Prefix:	tnc_
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Balance Type:	credit
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X

- Definition

Amount of increase in obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

No definition available.

+ Details

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Balance Type:	credit
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X

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044

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-Section 50
-Paragraph 8
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-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130532-203044

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X

- Definition

Amount of increase (decrease) in obligation to transfer good or service to customer for which consideration from customer has been received or is due, from business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045

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X

- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
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X

- Definition

Amount of liability for consideration received or receivable from customer which is not included in transaction price, when consideration is expected to be refunded to customer.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 55
-Paragraph 27
-URI http://asc.fasb.org/extlink&oid=121551570&loc=SL49130611-203046-203046

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X

- Details

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