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Business, Product and Geographical Area Information and Concentration of Risk - Schedule of Significant Segment Expenses Provided To CODM (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Segment Reporting Information [Line Items] |  |  |
Net sales | $ 3,024.0 | $ 3,087.0 | $ 3,427.9
Cost of products sold, excluding depreciation and amortization | 2,691.1 | 2,754.9 | 3,180.2
Hedged cost of alloyed metal | 1,567.8 | 1,621.1 | 2,045.2
Manufacturing costs | 805.2 | 809.9 | 773.0
Plant overhead | 170.5 | 164.6 | 162.3
Freight costs | 91.6 | 103.3 | 125.5
Other cost of products sold | 56.0 | 56.0 | 74.2
Depreciation and amortization | 116.4 | 108.6 | 106.9
Selling, general, administrative, research and development | 120.8 | 122.7 | 110.9
Research and development costs | 2.2 | 2.9 | 1.9
Employee costs | 83.3 | 80.0 | 69.9
Other selling, general and administrative costs | 35.3 | 39.8 | 39.1
Goodwill impairment | 0.0 | 0.0 | 20.5
Restructuring costs | 7.6 | 5.0 | 2.2
Other operating charges, net | 0.4 | 0.0 | 3.2
Interest expense | 43.7 | 46.9 | 48.3
Other income, net - Note 13 | (19.5) | (7.4) | (6.4)
Income tax provision (benefit) | 16.7 | 9.1 | (8.3)
Net income (loss) | $ 46.8 | $ 47.2 | $ (29.6)

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