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Business Segments - Reconciliation of Net Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Net sales $ 632.2 $ 539.1 $ 1,894.2 $ 1,589.4
Selling, general and administrative expenses (17.9) (15.6) (44.4) (42.0)
Other operating expense - net (1.1) (2.4) (4.6) (4.6)
Interest income 2.8 0.4 6.5 1.7
Loss on early extinguishment of debt (6.2) 0.0 (6.2) 0.0
Bargain purchase gain 0.0 0.0 0.0 245.9
Other loss - net (2.2) (4.0) (11.3) (4.4)
Income tax benefit (expense) 1.1 (2.0) 0.8 (3.0)
Net income 10.6 42.3 27.2 280.3
Nonrelated Party        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Net sales 312.6 207.0 828.3 618.1
Interest expense (11.5) (10.1) (31.3) (26.3)
Net (loss) gain on forward and derivative contracts (30.2) (2.8) (51.2) (4.3)
Related Party        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Net sales 319.6 332.1 1,065.9 971.3
Interest expense (1.5) (1.8) (5.2) (5.1)
Net (loss) gain on forward and derivative contracts 0.0 (1.2) 0.0 3.7
Reportable Segment        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Net sales 632.2 539.1 1,894.2 1,589.4
Segment Cost of goods sold (557.6) (480.9) (1,723.2) (1,482.4)
IRA Credit 24.7 47.4 66.5 70.0
Lower of cost or NRV inventory adjustment (0.7) 0.0 1.2 7.3
Property and equipment expense (21.3) (23.8) (64.6) (65.6)
Selling, general and administrative expenses (17.9) (15.6) (44.4) (42.0)
Other operating expense - net (1.1) (2.4) (4.6) (4.6)
Interest income 2.8 0.4 6.5 1.7
Loss on early extinguishment of debt (6.2) 0.0 (6.2) 0.0
Bargain purchase gain 0.0 0.0 0.0 245.9
Other loss - net (2.2) (4.0) (11.3) (4.4)
Income tax benefit (expense) 1.1 (2.0) 0.8 (3.0)
Net income 10.6 42.3 27.2 280.3
Reportable Segment | Nonrelated Party        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Interest expense (11.5) (10.1) (31.3) (26.3)
Net (loss) gain on forward and derivative contracts (30.2) (2.8) (51.2) (4.3)
Reportable Segment | Related Party        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Interest expense (1.5) (1.8) (5.2) (5.1)
Net (loss) gain on forward and derivative contracts $ 0.0 $ (1.2) $ 0.0 $ 3.7