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Revenue from Contracts with Customers (Details 2) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019
Contract with Customer, Contract Liability [Roll Forward] |  |
Beginning balance | $ 13.7 | $ 16.7
Additions to sales incentive accrual | 15.0 | 21.0
Contract payments | 15.6 | 24.4
Foreign currency fluctuations | (0.1) | (0.1)
Ending balance | $ 13.0 | $ 13.2

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- Definition Contract with Customer, Contract Liability + References No definition available. + Details
Name: | tnc_ContractwithCustomerContractLiabilityRollForward
Namespace Prefix: | tnc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Contract with Customer, Liability, Contract Payments + References No definition available. + Details
Name: | tnc_ContractwithCustomerLiabilityContractPayments
Namespace Prefix: | tnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Contract with Customer, Liability, 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

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- Definition Contract with Customer, Liability, Increase (Decrease) 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

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- 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=118944142&loc=SL49130611-203046-203046 + Details
Name: | us-gaap_ContractWithCustomerRefundLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant