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Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Income Statement [Abstract]    
Net Sales $ 488.2 $ 425.9
Costs and expenses:    
Cost of sales (422.0) (370.6)
Selling, general and administrative expenses (32.8) (27.8)
Other Cost and Expense, Operating 0.5 0.4
Total operating costs and expenses 455.3 398.8
Income from operations 32.9 27.1
Interest Expense, Net (8.6) (9.3)
Debt retirement costs (0.2) 0.0
Other Nonoperating Income (Expense) (1.4) (2.5)
Total non-operating expense (10.3) (11.8)
Income before income taxes 22.6 15.3
Income tax provision 6.0 3.2
Net income $ 16.6 $ 12.1
Net income per common share:    
Basic (in dollars per share) $ 0.99 $ 0.73
Diluted (in dollars per share) $ 0.97 $ 0.71
Weighted Average Number of Shares Outstanding, Basic 16,728 16,647
Weighted Average Number of Shares Outstanding, Diluted 17,073 16,979