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Other income (loss), net- Narrative (Details)
$ in Millions
1 Months Ended 12 Months Ended
Dec. 31, 2025
USD ($)
Dec. 31, 2025
USD ($)
Sep. 30, 2025
USD ($)
mill
Jun. 04, 2024
USD ($)
Long-Lived Assets Held-for-sale [Line Items]        
Gross proceeds from sale       $ 3.6
Gain on sale of unused inventories   $ 0.1    
Advanced royalty payments written off $ 0.6      
Held-for-sale | Ball Mills        
Long-Lived Assets Held-for-sale [Line Items]        
Number of mills to sell | mill     1  
Gross proceeds from sale     $ 4.0  
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Ball Mills        
Long-Lived Assets Held-for-sale [Line Items]        
Reduction in assets held for sale   2.8    
Gain on sale   $ 0.7    
Ball Mills | Held-for-sale        
Long-Lived Assets Held-for-sale [Line Items]        
Number of mills to sell | mill     1