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Revenue from Contracts with Customers (Details 2) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Contract with Customer, Contract Liability [Roll Forward] |  |
Beginning balance | $ 16.7 | $ 14.5
Additions to sales incentive accrual | 6.5 | 6.0
Contract payments | (12.6) | (11.6)
Foreign currency fluctuations | 0.0 | 0.1
Ending balance | $ 10.6 | $ 9.0

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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=108792157&loc=SL49130611-203046-203046 + Details
Name: | us-gaap_ContractWithCustomerRefundLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant