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Customer Concentrations (Narrative) (Details) T in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) customer T	Dec. 31, 2021 USD ($)
Concentration Risk [Line Items]
Number of primary customers | customer	2
Customer Concentration Risk
Concentration Risk [Line Items]
Quantity of coke sold to three primary customers (in tons) | T	3.4
Customer Concentration Risk | Cliffs Steel | Accounts Receivable
Concentration Risk [Line Items]
Accounts receivable net	$ 33.5	$ 30.0
Customer Concentration Risk | U.S. Steel | Accounts Receivable
Concentration Risk [Line Items]
Accounts receivable net	$ 7.1	$ 7.3
Customer Concentration Risk | Cliffs Steel and U.S. Steel | Accounts Receivable
Concentration Risk [Line Items]
Concentration risk, percentage	39.00%	48.00%

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Quantity of coke sold to primary customer.

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Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 954
-SubTopic 310
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=126942793&loc=d3e3073-115593

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-Name Accounting Standards Codification
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-Section S99
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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
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