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Business And Summary Of Significant Accounting Policies (Narrative) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	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	0	6,662,421	4,658,544
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	11.00%	24.90%		24.00%

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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