v3.26.3
Business, Product, and Geographical Area Information - Schedule of Significant Segment Expenses Provided to CODM (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Jun. 30, 2026
Mar. 31, 2026
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2026
Sep. 30, 2025
Segment Reporting [Line Items]                
Net sales $ 1,214.5     $ 843.5     $ 3,577.9 $ 2,444.0
Hedged cost of alloyed metal [1] 775.4     492.8     2,297.4 1,355.9
Manufacturing costs [2] 241.0     158.8     554.7 532.5
Plant overhead [3] 47.5     45.9     142.7 136.0
Freight costs 27.1     21.6     77.4 63.6
Other cost of products sold [4] 7.8     9.7     27.4 37.0
Depreciation and amortization 27.9     32.0     87.9 91.6
Research and development costs 0.5     0.4     1.8 1.0
Employee costs [5] 21.9     24.7     74.7 69.9
Other selling, general and administrative costs [6] 9.7     8.8     26.7 26.4
Restructuring costs               1.9
Other operating charges, net 0.5     0.0     0.5 0.0
Interest expense 14.2     12.4     43.1 36.1
Other expense (income), net - Note 8 0.8     (11.4)     (5.3) (14.4)
Income tax provision 9.2     8.3     58.6 22.2
Net income $ 31.0 $ 96.8 $ 62.5 $ 39.5 $ 23.2 $ 21.6 $ 190.3 [7] $ 84.3 [7]
[1] Hedged cost of alloyed metal includes cost of aluminum at the MWTP and the cost of alloying elements used in the production process. This metric is net of metal price exposure on shipments that we hedged with realized (losses) gains upon settlement of ($7.4) million and $10.2 million for the quarters ended September 30, 2026 and September 30, 2025, respectively, and $11.5 million and $15.4 million for the nine months ended September 30, 2026 and September 30, 2025, respectively.
[2] Manufacturing costs primarily includes labor, utilities, supplies, metal valuation impacts, metal profits, and other materials, excluding alloys, incurred at our various production facilities.
[3] Plant overhead includes salaried employee costs, property taxes, and insurance associated with our various production facilities.
[4] Other cost of products sold primarily includes accretion expense related to conditional asset retirement obligations, gains and losses on operating asset disposals, and major maintenance costs.
[5] Employee costs include indirect labor salaries, benefits, and incentive compensation.
[6] Other selling, general and administrative costs primarily includes professional services, computer hardware and software costs, office rent, and utilities.
[7] See Note 11 for supplemental cash flow information.