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Business And Summary Of Significant Accounting Policies (Narrative) (Details) - $ / shares | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | May 31, 2021 | Apr. 26, 2018
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Stock Repurchased and Retired During Period, Shares | 6,662,421 | 4,658,544 | 3,328,574 |  |
Sale of Stock (in dollars per share) |  |  |  |  | $ 15.00
Shares, Issued |  |  |  |  | 38,097,525
Number of Major Product Categories | 2 |  |  |  |
GrafTech International Ltd | Brookfield | GrafTech International Ltd |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Equity Method Investment, Ownership Percentage | 24.90% | 24.30% |  | 24.00% |

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