v3.26.1
Document and Entity Information
 12 Months Ended
Dec. 31, 2025
shares
Document and Entity Information [Line Items]  
Document Type 20-F
Document Registration Statement false
Document Annual Report true
Document Transition Report false
Document Shell Company Report false
Document Period End Date Dec. 31, 2025
Entity File Number 001-37668
Entity Registrant Name Ferroglobe PLC
Entity Incorporation, State or Country Code X0
Entity Address, Address Line One 13 Chesterfield Street
Entity Address, City or Town London
Entity Address, Country GB
Entity Address, Postal Zip Code W1J 5JN
Title of 12(b) Security Ordinary Shares (nominal value of $0.01)
Trading Symbol GSM
Security Exchange Name NASDAQ
Entity Well-known Seasoned Issuer No
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Filer Category Accelerated Filer
Document Accounting Standard International Financial Reporting Standards
Entity Emerging Growth Company false
Entity Shell Company false
Entity Common Stock, Shares Outstanding 186,860,517
Current Fiscal Year End Date --12-31
Document Fiscal Year Focus 2025
Document Fiscal Period Focus FY
Entity Central Index Key 0001639877
ICFR Auditor Attestation Flag true
Document Fin Statement Error Correction Flag false
Amendment Flag false
Auditor Name KPMG Auditores, S.L
Auditor Firm ID 1027
Auditor Location Madrid, Spain
Business Contact  
Document and Entity Information [Line Items]  
Entity Address, Address Line One 13 Chesterfield Street
Entity Address, City or Town London
Entity Address, Country GB
Entity Address, Postal Zip Code W1J 5JN
City Area Code 750
Local Phone Number 130‑8322
Contact Personnel Name Beatriz García-Cos,