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Business Segment Information - Segment Profit or Loss (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Segment Reporting Information [Line Items]        
Sales and other operating revenue $ 520.4 $ 516.8 $ 1,542.6 $ 1,458.5
Adjusted EBITDA 74.6 92.8 233.1 266.3
Depreciation and amortization expense 35.5 35.7 107.2 106.7
Capital expenditures 34.1 21.7 84.5 55.7
Operating Segments        
Segment Reporting Information [Line Items]        
Depreciation and amortization expense 35.4 35.4 107.0 105.9
Capital expenditures 34.0 21.1 84.3 55.1
Operating Segments | Domestic Coke        
Segment Reporting Information [Line Items]        
Sales and other operating revenue 495.7 487.7 1,460.4 1,371.8
Adjusted EBITDA 64.0 76.6 192.6 216.9
Depreciation and amortization expense 32.1 31.7 97.1 94.9
Capital expenditures 32.6 20.6 80.8 51.8
Operating Segments | Brazil Coke        
Segment Reporting Information [Line Items]        
Sales and other operating revenue 9.1 8.9 25.8 27.9
Adjusted EBITDA 2.2 3.3 6.9 11.4
Depreciation and amortization expense 0.1 0.0 0.2 0.1
Capital expenditures 0.0 0.0 0.2 0.1
Operating Segments | Logistics        
Segment Reporting Information [Line Items]        
Sales and other operating revenue 15.6 20.2 56.4 58.8
Adjusted EBITDA 8.4 12.9 33.6 38.0
Depreciation and amortization expense 3.2 3.7 9.7 10.9
Capital expenditures 1.4 0.5 3.3 3.2
Intersegment sales        
Segment Reporting Information [Line Items]        
Sales and other operating revenue (5.6) (7.4) (16.9) (22.2)
Intersegment sales | Logistics        
Segment Reporting Information [Line Items]        
Sales and other operating revenue 5.6 7.4 16.9 22.2
Corporate and Other        
Segment Reporting Information [Line Items]        
Depreciation and amortization expense 0.1 0.3 0.2 0.8
Capital expenditures $ 0.1 $ 0.6 $ 0.2 $ 0.6