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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% |  |

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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 + Details
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