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Business Segments and Geographic Information - Reconciliation of Net Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Net sales $ 633.9 $ 489.5
Selling, general and administrative expenses (12.5) (14.1)
Other operating expense - net (2.0) (0.5)
Interest income 1.8 0.7
Bargain purchase gain 0.0 245.9
Other income (loss) - net (3.4) (1.5)
Income tax expense (1.6) (0.5)
Net income 25.7 244.7
Related Party    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Net sales 378.7 315.0
Interest expense (1.8) (1.8)
Net gain (loss) on forward and derivative contracts 0.0 4.0
Nonrelated Party    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Net sales 255.2 174.5
Interest expense (10.0) (7.4)
Net gain (loss) on forward and derivative contracts (5.4) 3.4
Reportable Segment    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Net sales 633.9 489.5
Segment Cost of goods sold (574.8) (469.5)
IRA Credit 19.9 11.9
Lower of cost or NRV inventory adjustment 3.1 5.6
Property and equipment expense (21.5) (21.0)
Selling, general and administrative expenses (12.5) (14.1)
Other operating expense - net (2.0) (0.5)
Interest income 1.8 0.7
Bargain purchase gain 0.0 245.9
Other income (loss) - net (3.4) (1.5)
Income tax expense (1.6) (0.5)
Net income 25.7 244.7
Reportable Segment | Related Party    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Interest expense (1.8) (1.8)
Net gain (loss) on forward and derivative contracts 0.0 4.0
Reportable Segment | Nonrelated Party    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Interest expense (10.0) (7.4)
Net gain (loss) on forward and derivative contracts $ (5.4) $ 3.4