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

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- References

No definition available.

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

The amount of property plant and equipment capitalized interest.

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No definition available.

+ Details

Name:	ts_PropertyPlantAndEquipmentCapitalizedInterest
Namespace Prefix:	ts_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant