Segment Reporting - Narrative (Details)	3 Months Ended
Segment Reporting - Narrative (Details)	Mar. 31, 2026
External Customers \| Graphite Electrodes \| Revenue Benchmark \| Customer Concentration Risk
Revenue from External Customer [Line Items]
Concentration Risk, Percentage	90.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.