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Business Segment Information - Segment Profit or Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Sales and other operating revenues	$ 1,333.0	$ 1,600.3	$ 1,450.9
Adjusted EBITDA:	205.9	247.9	263.2
Depreciation and amortization expense	133.7	143.8	141.6
Capital expenditures	73.9	110.1	100.3
Corporate and Other
Segment Reporting Information [Line Items]
Adjusted EBITDA:	(41.9)	(37.4)	(35.7)
Depreciation and amortization expense	1.3	1.3	1.4
Research and development expense	3.9
Coal Mining
Segment Reporting Information [Line Items]
Adjusted EBITDA:	13.2	11.2	9.8
Operating Segments | Domestic Coke
Segment Reporting Information [Line Items]
Sales and other operating revenues	1,265.4	1,489.1	1,308.3
Adjusted EBITDA:	217.0	226.7	207.9
Depreciation and amortization expense	119.1	120.5	114.4
Capital expenditures	60.0	105.2	94.9
Operating Segments | Brazil Coke
Segment Reporting Information [Line Items]
Sales and other operating revenues	31.6	38.4	40.4
Adjusted EBITDA:	13.5	16.0	18.4
Depreciation and amortization expense	0.5	0.6	0.7
Capital expenditures	0.4	0.3	0.2
Operating Segments | Logistics
Segment Reporting Information [Line Items]
Sales and other operating revenues	36.0	72.8	102.2
Adjusted EBITDA:	17.3	42.6	72.6
Depreciation and amortization expense	12.8	21.4	25.1
Capital expenditures	13.5	4.6	5.2
Elimination of intersegment sales
Segment Reporting Information [Line Items]
Sales and other operating revenues	(22.1)	(26.3)	(24.5)
Elimination of intersegment sales | Logistics
Segment Reporting Information [Line Items]
Sales and other operating revenues	$ 22.1	$ 26.3	$ 24.5

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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