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Revenue from Contracts with Customers (Disaggregated Sales and Other Operating Revenue) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Sales and other operating revenue	$ 1,972.5	$ 1,456.0	$ 1,333.0
Cokemaking
Disaggregation of Revenue [Line Items]
Sales and other operating revenue	1,791.3	1,293.6	1,218.9
Energy
Disaggregation of Revenue [Line Items]
Sales and other operating revenue	61.5	56.1	43.6
Logistics
Disaggregation of Revenue [Line Items]
Sales and other operating revenue	76.7	64.3	35.5
Operating and licensing fees
Disaggregation of Revenue [Line Items]
Sales and other operating revenue	38.0	36.6	31.6
Other
Disaggregation of Revenue [Line Items]
Sales and other operating revenue	$ 5.0	$ 5.4	$ 3.4

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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