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Revenue from Contracts with Customers - Narrative (Details) T in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) T
Cokemaking
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Capacity (in tons)	4.1
Percentage of facility capacity	90.00%
Unsatisfied performance obligation (in tons)	17.6
Average remaining term	6 years
Logistics
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Average remaining term	3 years
Performance obligation amount | $	$ 35.0

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Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045

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