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Cover - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Feb. 02, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Document Transition Report false    
Entity File Number 1-13888    
Entity Registrant Name GRAFTECH INTERNATIONAL LTD.    
Entity Incorporation, State DE    
Entity Tax Identification Number 27-2496053    
Entity Address, Street 982 Keynote Circle    
Entity Address, City Brooklyn Heights    
Entity Address, State OH    
Entity Address, Zip Code 44131    
City Area Code 216    
Local Phone Number 676-2000    
Title of each class Common Stock, $0.01 par value per share    
Trading Symbol(s) EAF    
Name of each exchange on which registered NYSE    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 970.6
Entity Common Stock, Shares Outstanding   256,831,870  
Documents Incorporated by Reference
Portions of the definitive proxy statement (the “Proxy Statement”) to be filed with the Securities and Exchange Commission relative to the registrant’s 2024 Annual Meeting of Stockholders are incorporated by reference into Part III of this Report.
    
Entity Central Index Key 0000931148    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Amendment Flag false