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Business Segments (Tables)

12 Months Ended

Dec. 31, 2024

Segment Reporting [Abstract]

Reconciliation of assets from segment to consolidated

A reconciliation of our consolidated assets to the total of primary aluminum segment assets and capital expenditures is provided below.

Segment assets (1)			2024						2023						2022
Aluminum			$	1,896.6					$	1,808.1					$	1,432.4
Corporate, unallocated			42.8						38.4						39.6
Total assets			$	1,939.4					$	1,846.5					$	1,472.0
Capital expenditures			$	82.3					$	95.0					$	86.3

(1)Segment assets include accounts receivable, due from affiliates, prepaid and other current assets, leases - right of use assets, inventory, intangible assets and property, plant and equipment, net; the remaining assets are unallocated corporate assets.

Schedule of revenue from external customers and long-lived assets, by geographical areas

Included in the consolidated financial statements are the following amounts related to geographic locations:

			2024						2023						2022
Net sales: (1)
United States			$	1,427.0					$	1,358.6					$	1,737.2
Iceland			793.3						826.8						1,040.1
Total Net sales			2,220.3						2,185.4						2,777.3
Long-lived assets: (2)
United States			$	233.6					$	219.1					$	244.9
Iceland			526.4						529.4						491.0
Jamaica			255.2						275.8						—
Other			50.6						55.1						58.3

(1)Includes sales of primary aluminum, scrap aluminum and alumina, and purchased aluminum and alumina.

(2)Includes long-lived assets other than financial instruments and deferred taxes.

Schedule of revenue by major customers by reporting segments

A loss of these customers could have a material adverse effect on our results of operations. The net sales related to the customers is as follows:

			Year Ended December 31,
			2024						2023						2022
Glencore			$	1,312.1					$	1,612.1					$	1,671.1
Southwire			—						—						331.3

Schedule of segment information

The following table presents our segment information to reconcile to Segment EBITDA for the periods indicated and, because we only have one segment, our net income (loss) attributable to Century stockholders is identical to the information presented in the Consolidated Statements of Operations:

			Year Ended December 31,
			2024						2023						2022
Net sales			$	2,220.3					$	2,185.4					$	2,777.3
Segment Cost of goods sold(1)			(2,014.7)						(2,056.9)						(2,597.0)
IRA Credit - Cost of goods sold(2)			89.7						56.5						—
Asset impairment			—						—						(159.4)
Other segment items(3)			(25.4)						(55.7)						(12.9)
Segment EBITDA			269.9						129.3						8.0
Depreciation, depletion, and amortization - Cost of goods sold			(86.5)						(80.7)						(76.4)
Selling, general and administrative expenses			(56.8)						(44.3)						(37.5)
Interest expense - affiliates			(6.7)						(1.8)						—
Interest expense			(36.4)						(33.7)						(29.3)
Interest income			2.1						2.0						0.5
Net gain (loss) on forward and derivative contracts - nonaffiliates			2.5						(62.4)						210.4
Net gain (loss) on forward and derivative contracts - affiliates			(0.5)						0.6						(13.3)
Bargain purchase gain			245.9						—						—
Other(4)			(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						—
Net income (loss) attributable to Century stockholders, as reported			$	336.8					$	(43.1)					$	(14.1)

(1)Includes raw materials, labor, energy, and other direct cost of goods sold.

(2)Advanced production credit related to Section 45X of the Inflation Reduction Act.

(3)Includes freight costs and FIFO inventory adjustment.

(4)Includes equity in losses or earnings from joint ventures and inventory revaluation to lower of cost or net realizable value.

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- Definition

Tabular disclosure of all significant reconciling items in the reconciliation of total assets from reportable segments to the entity's consolidated assets.

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Tabular disclosure of the reconciliation of profit (loss) from reportable segments to the consolidated income (loss) before income tax expense (benefit) and discontinued operations. Includes, but is not limited to, reconciliation after income tax if income tax is allocated to the reportable segment.

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Tabular disclosure of the extent of the entity's reliance on its major customers, if revenues from transactions with a single external customer amount to 10 percent or more of entity revenues, including the disclosure of that fact, the total amount of revenues from each such customer, and the identity of the reportable segment or segments reporting the revenues. The entity need not disclose the identity of a major customer or the amount of revenues that each segment reports from that customer. For these purposes, a group of companies known to the entity to be under common control is considered a single customer, and the federal government, a state government, a local government such as a county or municipality, or a foreign government is each considered a single customer.

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