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Business Segment Information - Schedule of Adjusted EBITDA Reportable Segments (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenue | $ 434.1 | $ 470.9 | $ 870.1 | $ 959.3
Less: |  |  |  |
Selling, general and administrative expenses | 20.6 | 17.8 | 35.3 | 36.2
Depreciation and amortization expense | 28.6 | 28.7 | 57.4 | 62.0
Interest expense, net | 5.4 | 5.8 | 10.6 | 12.1
Income before income tax expense | 4.4 | 28.9 | 29.4 | 57.1
Interest expense | 7.0 | 7.2 | 13.8 | 14.4
Interest income | 1.6 | 1.4 | 3.2 | 2.3
Elimination |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenue | (5.9) | (5.9) | (11.5) | (11.8)
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenue | 440.0 | 476.8 | 881.6 | 971.1
Less: |  |  |  |
Adjusted EBITDA reportable segments | 50.8 | 72.6 | 116.7 | 149.4
Depreciation and amortization expense | 28.1 | 28.5 | 56.4 | 61.7
Corporate and Other |  |  |  |
Less: |  |  |  |
Other corporate expenses | 12.4 | 9.2 | 19.3 | 18.2
Domestic Coke |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenue | 410.4 | 441.6 | 816.2 | 901.1
Domestic Coke | Elimination |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenue | 0.0 | 0.0 | 0.0 | 0.0
Domestic Coke | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenue | 410.4 | 441.6 | 816.2 | 901.1
Less: |  |  |  |
Operating and maintenance expense | 71.2 | 78.8 | 142.3 | 150.3
Cost of products sold and other expenses | 291.5 | 297.4 | 569.5 | 616.1
Selling, general and administrative expenses | 7.2 | 7.5 | 14.0 | 15.4
Adjusted EBITDA reportable segments | 40.5 | 57.9 | 90.4 | 119.3
Depreciation and amortization expense | 24.9 | 25.4 | 50.0 | 55.3
Brazil Coke |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenue | 8.6 | 9.1 | 16.4 | 17.4
Brazil Coke | Elimination |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenue | 0.0 | 0.0 | 0.0 | 0.0
Brazil Coke | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenue | 8.6 | 9.1 | 16.4 | 17.4
Less: |  |  |  |
Operating and maintenance expense | 5.3 | 5.6 | 10.1 | 10.7
Cost of products sold and other expenses | 0.0 | 0.0 | 0.0 | 0.0
Selling, general and administrative expenses | 0.7 | 1.0 | 1.4 | 1.8
Adjusted EBITDA reportable segments | 2.6 | 2.5 | 4.9 | 4.9
Depreciation and amortization expense | 0.0 | 0.0 | 0.1 | 0.1
Logistics |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenue | 15.1 | 20.2 | 37.5 | 40.8
Logistics | Elimination |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenue | (5.9) | (5.9) | (11.5) | (11.8)
Logistics | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenue | 21.0 | 26.1 | 49.0 | 52.6
Less: |  |  |  |
Operating and maintenance expense | 13.0 | 13.5 | 27.0 | 26.6
Cost of products sold and other expenses | 0.0 | 0.0 | 0.0 | 0.0
Selling, general and administrative expenses | 0.3 | 0.4 | 0.6 | 0.8
Adjusted EBITDA reportable segments | 7.7 | 12.2 | 21.4 | 25.2
Depreciation and amortization expense | $ 3.2 | $ 3.1 | $ 6.3 | $ 6.3

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