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Share-Based Compensation (Liability Classified Awards Narrative) (Details) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2022 USD ($) installment $ / shares shares | Dec. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares
Restricted Stock Units Settled in Cash |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares granted (in shares) | shares | 250,615 | 230,056 | 263,998
Number of annual installment in which stock option exercisable | installment | 3 |  |
Period from grant date for annual installment (in years) | 1 year |  |
Granted (in dollars per share) | $ / shares | $ 7.56 | $ 6.68 | $ 6.04
Closing price (in dollars per share) | $ / shares | $ 8.63 |  |
Deferred compensation | $ 2.4 | $ 1.9 |
Cash Incentive Award | Suncoke LTCIP |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Grant date fair value award | $ 2.0 | $ 2.1 | $ 2.0
Percent of award allocation | 50.00% | 50.00% | 50.00%
Measurement period | 3 years |  |
Deferred compensation | $ 8.7 | $ 4.1 |

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- Definition Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements payable within one year (or the operating cycle, if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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