Business Segment Information - Schedule of Depreciation and Amortization Expense and Capital Expenditures (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]
Depreciation and amortization expense	$ 28.6	$ 28.7	$ 57.4	$ 62.0
Capital expenditures	12.6	17.5	17.5	33.0
Operating Segments
Segment Reporting Information [Line Items]
Depreciation and amortization expense	28.1	28.5	56.4	61.7
Capital expenditures	12.5	17.5	17.4	32.6
Operating Segments \| Domestic Coke
Segment Reporting Information [Line Items]
Depreciation and amortization expense	24.9	25.4	50.0	55.3
Capital expenditures	4.5	16.5	6.6	31.0
Operating Segments \| Logistics
Segment Reporting Information [Line Items]
Depreciation and amortization expense	3.2	3.1	6.3	6.3
Capital expenditures	8.0	1.0	10.7	1.6
Operating Segments \| Brazil Coke
Segment Reporting Information [Line Items]
Depreciation and amortization expense	0.0	0.0	0.1	0.1
Capital expenditures	0.0	0.0	0.1	0.0
Corporate and Other
Segment Reporting Information [Line Items]
Depreciation and amortization expense	0.5	0.2	1.0	0.3
Capital expenditures	$ 0.1	$ 0.0	$ 0.1	$ 0.4

- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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