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Business Segments - Reconciliation of Net Income (Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total net sales $ 2,220.3 $ 2,185.4 $ 2,777.3
Segment Cost of goods sold [1] 2,035.3 2,093.5 2,730.6
Asset impairment 0.0 0.0 159.4
Depreciation, depletion and amortization 81.8 74.7 73.4
Selling, general and administrative expenses 56.8 44.3 37.5
Interest income 2.1 2.0 0.5
Net gain (loss) on forward and derivative contracts - nonaffiliates 2.0 61.8 197.2
Bargain purchase gain 245.9 0.0 0.0
Other income, net (4.5) (3.3) 15.3
Income tax benefit (expense) (3.2) 14.6 (47.4)
Net Income (loss) 320.7 (52.3) (14.1)
Net loss attributable to noncontrolling interests 16.1 9.2 0.0
Net income (loss) attributable to Century stockholders 336.8 (43.1) (14.1)
Related Party      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total net sales 1,312.1 1,612.1 1,671.1
Segment Cost of goods sold 277.9 181.4 284.7
Interest expense (6.7) (1.8) 0.0
Net gain (loss) on forward and derivative contracts - nonaffiliates (0.5) 0.6 (13.3)
Nonrelated Party      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total net sales 908.2 573.3 1,106.2
Interest expense (36.4) (33.7) (29.3)
Net gain (loss) on forward and derivative contracts - nonaffiliates 2.5 (62.4) 210.4
Reportable Segment      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total net sales 2,220.3 2,185.4 2,777.3
Segment Cost of goods sold (2,014.7) (2,056.9) (2,597.0)
IRA Credit - Cost of goods sold 89.7 56.5 0.0
Asset impairment 0.0 0.0 (159.4)
Other segment items (25.4) (55.7) (12.9)
Segment EBITDA 269.9 129.3 8.0
Depreciation, depletion and amortization (86.5) (80.7) (76.4)
Selling, general and administrative expenses (56.8) (44.3) (37.5)
Interest income 2.1 2.0 0.5
Bargain purchase gain 245.9 0.0 0.0
Other income, net (9.7) 24.1 (29.1)
Income tax benefit (expense) (3.2) 14.6 (47.4)
Net Income (loss) 320.6 (52.3) (14.1)
Net loss attributable to noncontrolling interests 16.2 9.2 0.0
Net income (loss) attributable to Century stockholders 336.8 (43.1) (14.1)
Reportable Segment | Related Party      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Interest expense (6.7) (1.8) 0.0
Net gain (loss) on forward and derivative contracts - nonaffiliates (0.5) 0.6 (13.3)
Reportable Segment | Nonrelated Party      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Interest expense (36.4) (33.7) (29.3)
Net gain (loss) on forward and derivative contracts - nonaffiliates $ 2.5 $ (62.4) $ 210.4
[1]
(1) Including purchases from related party of $277.9 million, $181.4 million and $284.7 million for the years ended December 31, 2024, 2023 and 2022, respectively.