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Summary of Significant Accounting Policies - Impairment of Long-Lived Assets (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 product | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Goodwill [Line Items] |  |  |  |
Goodwill |  | $ 0 |  |
Goodwill impairment |  | $ 41,000,000 | $ 0 | $ 0
Coffeyville reporting unit, percentage of fair value in excess of carrying value |  |  |  | 36.00%
Nitrogen Fertilizer |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill |  |  | $ 41,000,000 |
Number of primary products experiencing significant pricing declines | product | 2 |  |  |

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