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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, 2020 USD ($) Installment $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares
Restricted Stock Units Settled in Cash |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares granted (shares) | shares | 263,998 | 147,851 | 98,364
Number of annual installment in which stock option exercisable | Installment | 3 |  |
Period from grant date for annual installment (in years) | 1 year |  |
Granted (in USD per share) | $ / shares | $ 6.04 | $ 9.66 | $ 10.71
Closing price (USD per share) | $ / shares | $ 4.35 |  |
Cash Incentive Award |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of annual installment in which stock option exercisable | Installment | 3 |  |
Cash Incentive Award | Suncoke LTCIP |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Grant date fair value award | $ | $ 2.0 | $ 0.6 | $ 1.0
Percent of award allocation | 50.00% |  |
Measurement period | 3 years |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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