CONSOLIDATED STATEMENTS OF CASH FLOWS (Parentheticals) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
CONSOLIDATED STATEMENTS OF CASH FLOWS
Currency translation adjustment, working capital	$ (39.4)	$ 30.3	$ (16.7)

The amount of currency translation adjustment working capital to reconcile profit (loss) to net cash flow from (used in) operating activities.

No definition available.

Name:	ts_CurrencyTranslationAdjustmentWorkingCapital
Namespace Prefix:	ts_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration