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Derivatives, Hedging Programs and Other Financial Instruments - Schedule of Fair Value of Derivative Financial Assets and Liabilities (Details) - USD ($)
Sep. 30, 2025
Dec. 31, 2024
Designated as Hedging Instrument | Purchase    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Liabilities $ (100,000) $ (800,000)
Not Designated as Hedging Instrument    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Net Amount 0 0
Fair Value, Measurements, Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets 11,900,000 4,000,000.0
Liabilities (2,800,000) (2,100,000)
Fair Value, Measurements, Recurring | Cash Flow Hedges | Level 1    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets 11,900,000 4,000,000.0
Liabilities (2,800,000) (2,100,000)
Net Amount 9,100,000 1,900,000
Fair Value, Measurements, Recurring | Cash Flow Hedges | Level 1 | Designated as Hedging Instrument | Purchase | Natural Gas    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets 1,000,000.0 500,000
Liabilities (1,000,000.0) (800,000)
Net Amount   (300,000)
Fair Value, Measurements, Recurring | Cash Flow Hedges | Level 1 | Designated as Hedging Instrument | Purchase | Aluminum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets 1,800,000 1,100,000
Liabilities   (800,000)
Net Amount 1,800,000 300,000
Fair Value, Measurements, Recurring | Cash Flow Hedges | Level 1 | Designated as Hedging Instrument | Purchase | Fixed Price Purchase Contracts for MWTP    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets 7,800,000 1,100,000
Net Amount 7,800,000 1,100,000
Fair Value, Measurements, Recurring | Cash Flow Hedges | Level 1 | Designated as Hedging Instrument | Purchase | Fixed Price Sale Contracts for MWTP    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Liabilities (1,200,000)  
Net Amount (1,200,000)  
Fair Value, Measurements, Recurring | Cash Flow Hedges | Level 1 | Designated as Hedging Instrument | Purchase | Foreign Currency    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets 100,000  
Liabilities   (400,000)
Net Amount 100,000 (400,000)
Fair Value, Measurements, Recurring | Cash Flow Hedges | Level 1 | Designated as Hedging Instrument | Purchase | Alloying Metals    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets 1,200,000 1,300,000
Liabilities (100,000) (100,000)
Net Amount 1,100,000 $ 1,200,000
Fair Value, Measurements, Recurring | Cash Flow Hedges | Level 1 | Designated as Hedging Instrument | Sales | Aluminum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Liabilities (500,000)  
Net Amount $ (500,000)