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Share-Based Compensation -Narrative (Details) $ / shares in Units, $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2023 USD ($) installment $ / shares shares | Sep. 30, 2022 USD ($) | Dec. 31, 2022 USD ($)
Director |  |  |
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items] |  |  |
Compensation expense | $ 0.7 | $ 0.4 |
RSUs |  |  |
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items] |  |  |
Share based payment award, grants in period (in shares) | shares | 352,646 |  |
Fair value grant (in dollars per share) | $ / shares | $ 8.97 |  |
Number of annual installment in which stock option exercisable (in installments) | installment | 3 |  |
Period from grant date for annual installment (in years) | 1 year |  |
PSUs | Minimum |  |  |
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items] |  |  |
Percent of original award granted | 25.00% |  |
PSUs | Maximum |  |  |
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items] |  |  |
Percent of original award granted | 200.00% |  |
Restricted Stock Units Settled in Cash |  |  |
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items] |  |  |
Share based payment award, grants in period (in shares) | shares | 216,547 |  |
Fair value grant (in dollars per share) | $ / shares | $ 9.24 |  |
Number of annual installment in which stock option exercisable (in installments) | installment | 3 |  |
Period from grant date for annual installment (in years) | 1 year |  |
Award liability | $ 2.2 |  | $ 2.4
Cash incentive award | Suncoke LTCIP |  |  |
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items] |  |  |
Award liability | 7.7 |  | $ 8.7
Grant date fair value of award | $ 2.2 |  |
Percent of award allocation | 50.00% |  |
Measurement period | 3 years |  |

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