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Consolidated Statements of Operations (unaudited) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Income Statement [Abstract]    
Revenues $ 549.2 $ 535.8
Operating costs:    
Cost of revenues 440.6 439.7
Selling, general, and administrative expenses 62.5 62.6
Gains on disposition of property, plant, equipment, and other assets (22.6) (1.2)
Gain on sale of storage tanks business (6.4) 0.0
Costs and Expenses, Total 474.1 501.1
Total operating profit 75.1 34.7
Interest expense 7.1 7.2
Other, net (income) expense (1.9) 0.9
Income before income taxes 69.9 26.6
Provision for income taxes 14.2 6.4
Net income $ 55.7 $ 20.2
Net income per common share:    
Basic (in dollars per share) $ 1.15 $ 0.42
Diluted (in dollars per share) $ 1.14 $ 0.41
Weighted average number of shares outstanding:    
Basic (in shares) 48.3 48.2
Diluted (in shares) 48.8 48.8
Dividends declared per common share $ 0.05 $ 0.05