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Business Segments
 6 Months Ended
Jun. 30, 2025
Segment Reporting [Abstract]  
Business Segments
14.    Business Segments
The Company is a producer of alumina and primary aluminum. The Company has organized itself, including management personnel and systems, financial processes, operational execution, governance and risk oversight, regulatory compliance, and
every other aspect of the Company’s operations, to assess and manage the business on a holistic basis, from mine to metal, which tracks the upstream manufacturing process for aluminum. To better reflect this operational and organizational approach, and to further enhance the reporting of its financial and operating results, beginning with the quarter ended March 31, 2025, the Company’s Chief Executive Officer and Chief Operating Decision Maker ("CODM") regularly receives and reviews financial information at the consolidated level to evaluate business performance and make operating decisions. The CODM uses the U.S. GAAP measure of consolidated Net Income to evaluate the Company’s financial performance and allocate resources.
Given the change described above, the Company has determined that neither its three smelters nor Jamalco’s mining and refining operations meet the definition of operating segments. As a result, the Company has determined that the Company has only one operating and only one reportable segment, and it is managed on a consolidated basis. In accordance with ASC 280-10-50-34, the corresponding information for earlier periods is recast in the tables below to conform with the updated presentation.
The CODM uses the U.S. GAAP measurement of consolidated Net income to develop forecasting, evaluate overall profitability performance and to make key operating decisions, such as the allocation of budget between sales, cost of good sold and selling, general and administrative expenses.
Segment assets are reported on our Consolidated Balance Sheets as Total assets. Our Consolidated Statements of Cash Flows presents Depreciation, depletion and amortization expense and includes the measure of Capital expenditures as Purchase of property, plant and equipment.
The following table presents information about the Company's single segment for the three and six months ended June 30, 2025 and 2024.
Three months ended
June 30,		Six months ended
June 30,
2025202420252024
Net sales$628.1 $560.8 $1,262.0 $1,050.3 
Segment Cost of goods sold(1),(2)
(593.2)(532.0)(1,165.6)(1,001.5)
IRA Credit(1),(3)
21.9 10.7 41.8 22.6 
Lower of cost or NRV inventory adjustment(1),(4)
1.2 1.7 1.9 7.3 
Property and equipment expense(1),(5)
(21.8)(20.8)(43.3)(41.8)
Selling, general and administrative expenses(14.0)(12.3)(26.5)(26.4)
Other operating expenses - net(1.5)(1.7)(3.5)(2.2)
Interest expense - nonaffiliates(9.8)(8.9)(19.8)(16.2)
Interest expense - affiliates(1.9)(1.4)(3.7)(3.3)
Interest income1.9 0.6 3.7 1.3 
Net (loss) gain on forward and derivative contracts - nonaffiliates(15.6)(2.1)(21.0)0.9 
Net (loss) gain on forward and derivative contracts - affiliates— (1.9)— 2.5 
Bargain purchase gain— — — 245.9 
Other (loss) income - net(5.7)1.1 (9.1)(0.4)
Income tax benefit (expense)1.3 (0.5)(0.3)(1.0)
Net (loss) income$(9.1)$(6.7)$16.6 $238.0 
(1)Indicates a component of Cost of goods sold.
(2)Includes raw materials, labor, energy, freight costs, FIFO inventory adjustments and other direct cost of goods sold.
(3)Advanced production credit related to Section 45X of the IRA.
(4)Includes inventory revaluation to lower of cost or net realizable value and changes in inventory reserve.
(5)Represents the depreciation expenses and expenses related to leased assets that are directly related to the cost of goods sold.