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Business Segment Information (Segment Profit or Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Sales and other operating revenue	$ 1,972.5	$ 1,456.0	$ 1,333.0
Adjusted EBITDA:	297.7	275.4	205.9
Depreciation and amortization expense:	142.5	133.9	133.7
Capital expenditures:	75.5	98.6	73.9
Operating Segments | Domestic Coke
Segment Reporting Information [Line Items]
Sales and other operating revenue	1,856.9	1,354.5	1,265.4
Adjusted EBITDA:	263.4	243.4	217.0
Depreciation and amortization expense:	126.8	119.0	119.1
Capital expenditures:	70.3	83.1	60.0
Operating Segments | Brazil Coke
Segment Reporting Information [Line Items]
Sales and other operating revenue	38.0	36.6	31.6
Adjusted EBITDA:	14.5	17.2	13.5
Depreciation and amortization expense:	0.2	0.4	0.5
Capital expenditures:	0.1	0.3	0.4
Operating Segments | Logistics
Segment Reporting Information [Line Items]
Sales and other operating revenue	77.6	64.9	36.0
Adjusted EBITDA:	49.7	43.5	17.3
Depreciation and amortization expense:	14.5	13.3	12.8
Capital expenditures:	4.5	14.7	13.5
Intersegment sales
Segment Reporting Information [Line Items]
Sales and other operating revenue	(28.9)	(27.1)	(22.1)
Intersegment sales | Logistics
Segment Reporting Information [Line Items]
Sales and other operating revenue	(28.9)	(27.1)	(22.1)
Corporate and Other
Segment Reporting Information [Line Items]
Adjusted EBITDA:	(29.9)	(28.7)	(41.9)
Depreciation and amortization expense:	1.0	1.2	1.3
Capital expenditures:	$ 0.6	$ 0.5	0.0
Research and development expense			$ 3.9

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