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Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Nov. 28, 2022 | Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022 | Jan. 31, 2023
Loss Contingencies [Line Items] |  |  |  |  |
Minimum Carbon Dioxide Supply |  |  |  |  | $ 15.0
Maximum fee payable |  |  |  |  | $ 45.0
Expense (benefit) |  | $ (11.0) |  |  |
Starfire Holding Corporation |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Ownership percentage by principal owner |  | 99.60% |  |  |
Pension funding indemnity agreement with subsidiary |  | $ 250.0 |  |  |
ACF |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Funded status of related party pension plan |  | $ 48.0 |  |  |
Icahn Enterprises Holdings | Viskase And ACF Industries LLC [Member] | Minimum |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Ownership percentage by principal owner |  | 80.00% |  |  |
Mr. Icahn and affiliates | Minimum |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Affiliate ownership interest |  | 80.00% |  |  |
Mr. Icahn and affiliates | Icahn Enterprises G.P. |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Affiliate ownership in parent company general partner |  | 100.00% |  |  |
Mr. Icahn and affiliates | Icahn Enterprises Holdings |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Affiliate ownership interest |  | 84.00% |  |  |
Energy Segment |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Amount of quantifying alleged damages |  | $ 6.8 |  |  |
Expense (benefit) |  |  | $ 107.0 |  |
RFS position |  | 582.0 |  | $ 692.0 |
Insurance policies coverage limits | $ 50.0 |  |  |  |
Energy Segment | Call option lawsuits |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Litigation settlement paid |  |  |  | 79.0 |
Accrued expenses and other liabilities |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Environmental loss contingency accrual |  | $ 21.0 |  | $ 22.0 |

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