Business Segment Information - Schedule of Business Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting Information [Line Items]
Total sales and other operating revenues	$ 490.1	$ 520.4	$ 1,449.4	$ 1,542.6
Total Adjusted EBITDA reportable segments	74.3	74.6	223.7	233.1
Total depreciation and amortization expense	28.1	35.5	90.1	107.2
Total capital expenditures	15.1	34.1	48.1	84.5
Operating Segments
Segment Reporting Information [Line Items]
Total depreciation and amortization expense	28.0	35.4	89.7	107.0
Total capital expenditures	15.0	34.0	47.6	84.3
Operating Segments | Domestic Coke
Segment Reporting Information [Line Items]
Total sales and other operating revenues	459.9	495.7	1,361.0	1,460.4
Total Adjusted EBITDA reportable segments	58.1	64.0	177.4	192.6
Total depreciation and amortization expense	24.6	32.1	79.9	97.1
Total capital expenditures	12.3	32.6	43.3	80.8
Operating Segments | Brazil Coke
Segment Reporting Information [Line Items]
Total sales and other operating revenues	8.8	9.1	26.2	25.8
Total Adjusted EBITDA reportable segments	2.5	2.2	7.4	6.9
Total depreciation and amortization expense	0.1	0.1	0.2	0.2
Total capital expenditures	0.1	0.0	0.1	0.2
Operating Segments | Logistics
Segment Reporting Information [Line Items]
Total sales and other operating revenues	21.4	15.6	62.2	56.4
Total Adjusted EBITDA reportable segments	13.7	8.4	38.9	33.6
Total depreciation and amortization expense	3.3	3.2	9.6	9.7
Total capital expenditures	2.6	1.4	4.2	3.3
Intersegment sales
Segment Reporting Information [Line Items]
Total sales and other operating revenues	(6.0)	(5.6)	(17.8)	(16.9)
Intersegment sales | Logistics
Segment Reporting Information [Line Items]
Total sales and other operating revenues	6.0	5.6	17.8	16.9
Corporate and Other
Segment Reporting Information [Line Items]
Total depreciation and amortization expense	0.1	0.1	0.4	0.2
Total capital expenditures	$ 0.1	$ 0.1	$ 0.5	$ 0.2