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Note 3 - Revenue - Contract Liabilities (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Sales Incentives [Member]
Beginning balance	$ 12.1	$ 13.7
Additions to sales incentive accrual	15.7	9.1
Contract payments	(13.0)	(11.8)
Foreign currency fluctuations	(0.1)	(0.1)
Divestiture of business	(0.1)	0.0
Ending balance	14.6	10.9
Maintenance [Member]
Foreign currency fluctuations	0.1	(0.2)
Beginning balance	9.3	10.7
Increase in deferred revenue representing our obligation to satisfy future performance obligations	17.8	7.2
Decrease in deferred revenue for amounts recognized in net sales for satisfied performance obligations	(17.1)	(7.3)
Ending balance	$ 10.1	$ 10.4

X

- Definition

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

+ References

No definition available.

+ Details

Name:	tnc_ContractWithCustomerLiabilityContractPayments
Namespace Prefix:	tnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of decrease in contract with customer liability from divestiture of business.

+ References

No definition available.

+ Details

Name:	tnc_ContractWithCustomerLiabilityDivestitureOfBusiness
Namespace Prefix:	tnc_
Data Type:	xbrli:monetaryItemType
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

Name:	tnc_ContractWithCustomerLiabilityImpactOfForeignCurrency
Namespace Prefix:	tnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

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

+ References

No definition available.

+ Details

Name:	tnc_ContractWithCustomerLiabilityIncreaseDecreaseForSalesIncentiveAccruals
Namespace Prefix:	tnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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

Name:	tnc_ContractWithCustomerLiabilityIncreaseInObligationToSatisfyFutureObligations
Namespace Prefix:	tnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of revenue recognized arising from contract liability for performance obligation to be satisfied.

+ References

No definition available.

+ Details

Name:	tnc_ContractWithCustomerLiabilityPerformanceObligationSatisfiedRevenueRecognized
Namespace Prefix:	tnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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=123360276&loc=SL49130531-203044

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123351226&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=123360276&loc=SL49130532-203044

+ Details

Name:	us-gaap_ContractWithCustomerLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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=123410239&loc=SL49130611-203046-203046

+ Details

Name:	us-gaap_ContractWithCustomerRefundLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	srt_ProductOrServiceAxis=tnc_SalesIncentivesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=us-gaap_MaintenanceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: