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Business Segments - Reconciliation of Net Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Net sales $ 628.1 $ 560.8 $ 1,262.0 $ 1,050.3
Selling, general and administrative expenses (14.0) (12.3) (26.5) (26.4)
Other operating expense - net (1.5) (1.7) (3.5) (2.2)
Interest income 1.9 0.6 3.7 1.3
Bargain purchase gain 0.0 0.0 0.0 245.9
Other (loss) income - net (5.7) 1.1 (9.1) (0.4)
Income tax benefit (expense) 1.3 (0.5) (0.3) (1.0)
Net (loss) income (9.1) (6.7) 16.6 238.0
Nonrelated Party        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Net sales 260.5 236.6 515.7 411.1
Interest expense (9.8) (8.9) (19.8) (16.2)
Net (loss) gain on forward and derivative contracts (15.6) (2.1) (21.0) 0.9
Related Party        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Net sales 367.6 324.2 746.3 639.2
Interest expense (1.9) (1.4) (3.7) (3.3)
Net (loss) gain on forward and derivative contracts 0.0 (1.9) 0.0 2.5
Reportable Segment        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Net sales 628.1 560.8 1,262.0 1,050.3
Segment Cost of goods sold (593.2) (532.0) (1,165.6) (1,001.5)
IRA Credit 21.9 10.7 41.8 22.6
Lower of cost or NRV inventory adjustment 1.2 1.7 1.9 7.3
Property and equipment expense (21.8) (20.8) (43.3) (41.8)
Selling, general and administrative expenses (14.0) (12.3) (26.5) (26.4)
Other operating expense - net (1.5) (1.7) (3.5) (2.2)
Interest income 1.9 0.6 3.7 1.3
Bargain purchase gain 0.0 0.0 0.0 245.9
Other (loss) income - net (5.7) 1.1 (9.1) (0.4)
Income tax benefit (expense) 1.3 (0.5) (0.3) (1.0)
Net (loss) income (9.1) (6.7) 16.6 238.0
Reportable Segment | Nonrelated Party        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Interest expense (9.8) (8.9) (19.8) (16.2)
Net (loss) gain on forward and derivative contracts (15.6) (2.1) (21.0) 0.9
Reportable Segment | Related Party        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Interest expense (1.9) (1.4) (3.7) (3.3)
Net (loss) gain on forward and derivative contracts $ 0.0 $ (1.9) $ 0.0 $ 2.5