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Share-Based Compensation - Schedule of Compensation Expense, Unrecognized Compensation Costs, and Unrecognized Compensation Cost is Expected to be Recognized (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Total equity awards | Selling, General and Administrative Expenses |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Compensation expense | $ 1.3 | $ 1.5 | $ 1.7 | $ 2.9
RSUs |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Unrecognized Compensation Cost | 2.5 |  | $ 2.5 |
Weighted Average Remaining Recognition Period |  |  | 2 years 1 month 6 days |
RSUs | Selling, General and Administrative Expenses |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Compensation expense | 1.1 | 1.4 | $ 1.3 | 1.8
PSUs |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Unrecognized Compensation Cost | 1.3 |  | $ 1.3 |
Weighted Average Remaining Recognition Period |  |  | 2 years 2 months 12 days |
PSUs | Selling, General and Administrative Expenses |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Compensation expense | 0.2 | 0.1 | $ 0.4 | 1.1
Total liability awards | Selling, General and Administrative Expenses |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Compensation expense | 0.6 | 0.7 | 1.1 | 2.1
Cash RSUs |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Unrecognized Compensation Cost | 1.6 |  | $ 1.6 |
Weighted Average Remaining Recognition Period |  |  | 1 year 7 months 6 days |
Cash RSUs | Selling, General and Administrative Expenses |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Compensation expense | 0.3 | 0.3 | $ 0.3 | 0.8
Cash incentive award | Suncoke LTCIP |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Unrecognized Compensation Cost | 2.5 |  | $ 2.5 |
Weighted Average Remaining Recognition Period |  |  | 2 years |
Cash incentive award | Selling, General and Administrative Expenses | Suncoke LTCIP |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Compensation expense | $ 0.3 | $ 0.4 | $ 0.8 | $ 1.3

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479983/718-10-S45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479830/718-10-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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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. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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