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Consolidated Statements of Operations (unaudited) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Income Statement [Abstract]        
Revenues $ 591.7 $ 603.9 $ 1,725.7 $ 1,742.5
Operating costs:        
Cost of revenues 484.6 488.8 1,388.9 1,411.4
Selling, general, and administrative expenses 61.3 67.8 194.5 196.7
Gains on disposition of property, plant, equipment, and other assets (2.6) (1.7) (25.8) (6.5)
Gain on sale of storage tanks business 0.0 0.0 (6.4) 0.0
Costs and Expenses, Total 543.3 554.9 1,551.2 1,601.6
Total operating profit 48.4 49.0 174.5 140.9
Interest expense 6.7 8.6 20.9 23.5
Other, net (income) expense (1.3) (0.2) (5.8) 1.1
Income before income taxes 43.0 40.6 159.4 116.3
Provision for income taxes 7.5 8.6 27.3 25.1
Net income $ 35.5 $ 32.0 $ 132.1 $ 91.2
Net income per common share:        
Basic (in dollars per share) $ 0.73 $ 0.66 $ 2.71 $ 1.88
Diluted (in dollars per share) $ 0.72 $ 0.66 $ 2.70 $ 1.87
Weighted average number of shares outstanding:        
Basic (in shares) 48.7 48.3 48.5 48.2
Diluted (in shares) 48.8 48.5 48.7 48.5
Dividends declared per common share $ 0.05 $ 0.05 $ 0.15 $ 0.15