Note 9 - Income tax (Details Textual) - USD ($) $ in Millions |
12 Months Ended | |||
|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Disclosure of geographical areas [line items] | ||||
| Pillar two legislation description | Tenaris applies the IAS 12 exception regarding the recognition and disclosure of deferred tax assets and liabilities related to Pillar Two income taxes. | Tenaris applies the exception regarding the recognition and disclosure of deferred tax assets and liabilities related to Pillar Two income taxes | ||
| Current tax expense, related to Pillar Two income taxes | $ 20.7 | $ 81.4 | ||
| Charge related to withholding taxes for intra group international operations | 30.9 | 20.0 | $ 164.3 | |
| Deferred Tax Income Recognised In Profit Or Loss | 78.4 | 186.0 | 550.3 | |
| Charge related to pillar two | 20.7 | 81.4 | ||
| Argentina and Mexico | ||||
| Disclosure of geographical areas [line items] | ||||
| Tax inflation adjustments | 168.7 | $ 368.2 | $ 349.0 | |
| Luxembourg Ville | ||||
| Disclosure of geographical areas [line items] | ||||
| Corporate income tax rate | 23.87% | 24.94% | ||
| Consumption of deferred tax assets | $ 82.2 | $ 86.9 | ||