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Acquisitions and Divestitures (Simplification Transaction Narrative) (Details) - USD ($) |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 28, 2019 | Jun. 27, 2019 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Simplification Transaction |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |
Outstanding Partnership public units (in shares) | 17,727,249 |  |  |  |  |
Units purchased (in shares) | 24,818,149 |  |  |  |  |
Quarterly distribution of newly issued shares (in shares) | 635,502 |  |  |  |  |
Gain (loss) from transaction |  |  |  | $ 0 |  |
Transaction costs |  |  | $ 11,000,000.0 |  | $ 4,900,000 | $ 400,000
Legal and consulting costs |  |  |  |  | 300,000 |
Simplification Transaction | Additional Paid-In Capital |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |
Accrued Simplification Transaction costs |  |  | $ 5,400,000 |  | $ 5,400,000 |
Suncoke Inc |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |
Ownership interest of general partnership |  | 60.40% |  |  |  |
Interest in partnership |  | 2.00% |  |  |  |
Public Unitholders |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |
Ownership interest, public |  | 37.60% |  |  |  |

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