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Customer Concentrations (Narrative) (Details) - Customer Concentration Risk T in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020 USD ($) T	Dec. 31, 2019 USD ($)
Concentration Risk [Line Items]
Quantity of coke sold to three primary customers (in tons) | T			3.8
Cliffs | Accounts Receivable
Concentration Risk [Line Items]
Accounts receivable due, net			$ 22.9
U.S. Steel | Accounts Receivable
Concentration Risk [Line Items]
Accounts receivable due, net			$ 6.3	$ 7.3
AM USA | Accounts Receivable
Concentration Risk [Line Items]
Accounts receivable due, net				19.5
AK Steel | Accounts Receivable
Concentration Risk [Line Items]
Accounts receivable due, net				$ 13.2
Forecast | Cliffs
Concentration Risk [Line Items]
Percent of cokemaking capacity	65.00%	75.00%

X

- Definition

Percent Of Cokemaking Capacity

+ References

No definition available.

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- Definition

Quantity of coke sold to primary customer.

+ References

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- Definition

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 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(5))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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