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Note 10 - Property, Plant and Equipment, Net (Details Textual) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of detailed information about property, plant and equipment [abstract] |  |
Property, plant and equipment, capitalized interest | $ 33.6 | $ 35.4

X
- References No definition available. + Details
Name: | ifrs-full_DisclosureOfPropertyPlantAndEquipmentAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of property plant and equipment capitalized interest. + References No definition available. + Details
Name: | ts_PropertyPlantAndEquipmentCapitalizedInterest
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant