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Revenue from Contracts with Customers - Disaggregated Sales and Other Operating Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Sales and other operating revenue	$ 1,333.0	$ 1,600.3	$ 1,450.9
Cokemaking
Disaggregation of Revenue [Line Items]
Sales and other operating revenue	1,218.9	1,434.9	1,250.5
Energy
Disaggregation of Revenue [Line Items]
Sales and other operating revenue	43.6	51.1	49.7
Logistics
Disaggregation of Revenue [Line Items]
Sales and other operating revenue	35.5	72.1	101.0
Operating and licensing fees
Disaggregation of Revenue [Line Items]
Sales and other operating revenue	31.6	38.4	40.4
Other
Disaggregation of Revenue [Line Items]
Sales and other operating revenue	$ 3.4	$ 3.8	$ 9.3

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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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