v3.26.1
Other liabilities - Narratives (Details)
€ in Millions
1 Months Ended 12 Months Ended
Feb. 01, 2018
USD ($)
Nov. 30, 2024
USD ($)
Nov. 30, 2024
EUR (€)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Nov. 30, 2024
EUR (€)
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Grant Received From Ministry Of Industry And Tourism Of The Government Of Spain   $ 13,800,000 € 11.7      
Projected capital expenditure investment   $ 32,900,000       € 28.0
Threshold emission reduction forecast percentage   80.00% 80.00%      
Threshold final investment percentage of total budget   60.00% 60.00%      
Ferroglobe Mangan Norge and Ferroglobe Manganese France            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Percentage of equity interests acquired 100.00%          
Period for contingent consideration 8 years 6 months          
Payment of contingent consideration       $ 2,533,000 $ 3,861,000  
Accumulated payments       33,672,000    
Contingent consideration       $ 3,136,000 $ 3,338,000  
Ferroglobe Mangan Norge and Ferroglobe Manganese France | Maximum            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Contingent consideration arrangements $ 60,000,000