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Related Party Transactions (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Oct. 01, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Related Party Transaction [Line Items] |  |  |  |
Other income (loss), net |  | $ (84.0) | $ (31.0) | $ 19.0
Incentive Plan 2017 [Member] | Restricted Depositary Units [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Grants of restricted depository units | 239,254 |  |  |
Vesting period | 7 years |  |  |
Equity earnings from non-consolidated affiliates |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Other income (loss), net |  | 8.0 | 2.0 | 21.0
Investment in funds | Mr. Icahn and affiliates |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Amount of transaction with related party |  | $ 1,241.0 | $ 220.0 |
Percentage fair value of investments in Funds that is attributable to Mr. Icahn |  | 54.00% | 54.00% |
Noncontrolling Interest in Variable Interest Entity |  | $ 5.0 | $ 5.0 |
Expense sharing arrangement | Consolidated VIE |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Amount of transaction with related party |  | 15.0 | 2.0 | 23.0
Repair services revenue from related party | Hertz |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Amount of transaction with related party |  | 20.0 | 54.0 |
Automotive Segment |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Other income (loss), net |  | (2.0) | (7.0) | 15.0
Automotive Segment | 767 Leasing |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Contribution to non-consolidated VIE |  | 36.0 | 75.0 | 50.0
VIE equity earnings |  | 2.0 | (7.0) | 11.0
Equity investment in non-consolidated VIE |  |  | 40.0 |
Investment Segment |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Other income (loss), net |  | (75.0) | (17.0) | $ (5.0)
Brett Icahn |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Amount contributed in accordance with manager agreement |  | 76.0 | 12.0 |
Investment funds total fair value |  | $ 93.0 | $ 12.0 |

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