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Note 26 - Agreement to Build a Welded Pipe Plant in West Siberia (Details Textual) - Welded pipe plant in West Siberia [member] $ in Millions |  | 12 Months Ended
--- | --- | ---
Feb. 05, 2019 USD ($) t | Dec. 31, 2019 USD ($)
Statement Line Items [Line Items] |  |
Proportion of ownership interest in joint venture | 49.00% |
Investments in joint ventures | $ 280.0 |
Manufacturing capacity, steel pipes (Metric Ton) | t | 300,000 |
Other cash payments to acquire interests in joint ventures |  | $ 19.6
PAO Severstal [member] |  |
Statement Line Items [Line Items] |  |
Proportion of ownership interest in joint venture | 51.00% |

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