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Business Segments - Reconciliation of Net Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
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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.

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