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Note 6 - Other operating income and expenses (Details Textual) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 USD ($)
Disclosure of detailed information about other operating income and expenses [line items] |
Insurance recovery | $ 7.0
Brazil |
Disclosure of detailed information about other operating income and expenses [line items] |
Recovery of legal proceedings | $ 17.6

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
Name: | ts_DisclosureOfDetailedInformationAboutOtherOperatingIncomeAndExpensesLineItems
Namespace Prefix: | ts_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of recovery of insurance included in miscellaneous other operating income. + References No definition available. + Details
Name: | ts_MiscellaneousOtherOperatingIncomeRecoveryOfInsurance
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of recovery of legal proceedings included in miscellaneous other operating income. + References No definition available. + Details
Name: | ts_MiscellaneousOtherOperatingIncomeRecoveryOfLegalProceedings
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=country_BR
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |