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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income Statement [Abstract]      
Net sales $ 2,082.8 $ 2,080.1 $ 1,772.6
Costs and expenses:      
Cost of sales (1,752.0) (1,823.4) (1,590.0)
Selling, general and administrative expenses (148.3) (133.0) (112.9)
Other operating charges, net 5.3 9.7 57.7
Total operating costs and expenses 1,905.7 1,966.2 1,760.6
Income from operations 177.1 113.9 12.0
Interest expense, net (30.0) (34.6) (36.4)
Debt retirement costs (3.1) (0.5) (1.0)
Other Nonoperating Income (Expense) 0.1 (5.7) (10.4)
Income (loss) before income taxes 144.2 73.1 (35.7)
Income tax provision (benefit) (36.4) (27.0) 7.7
Net income (loss) $ 107.7 $ 46.0 $ (28.1)
Earnings per share, basic $ 6.39 $ 2.71 $ (1.67)
Earnings per share, diluted $ 6.30 $ 2.68 $ (1.67)
Weighted average number of shares outstanding, basic 16,863 16,985 16,767
Weighted average number of shares outstanding, diluted 17,091 17,181 16,767