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Related Party Transactions (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Oct. 01, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Related Party Transaction [Line Items] |  |  |  |
Other income (loss), net |  | $ (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 |  | 2.0 | 21.0 | $ 7.0
Investment in funds | Mr. Icahn and affiliates |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Amount of transaction with related party |  | $ 1,241.0 | $ 220.0 | 310.0
Percentage fair value of investments in Funds that is attributable to Mr. Icahn |  | 54.00% | 51.00% |
Noncontrolling Interest in Variable Interest Entity |  | $ 5.0 | $ 4.5 |
Expense sharing arrangement | Consolidated VIE |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Amount of transaction with related party |  | 2.0 | 23.0 | 12.0
Repair services revenue from related party | Hertz |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Amount of transaction with related party |  | 20.0 | 54.0 | 40.0
Purchases from related party | ACF |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Amount of transaction with related party |  |  |  | 3.0
Sales to related party | ACF |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Amount of transaction with related party |  |  |  | 6.0
Buying group operating expenses | Insight Portfolio Group LLC |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Amount of transaction with related party |  |  | 3.0 | 4.0
Automotive Segment |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Other income (loss), net |  | (7.0) | 15.0 | (1.0)
Automotive Segment | 767 Leasing |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Amount of transaction with related party |  | 43.0 | 75.0 | 7.0
Net (loss) income from related party transaction |  | (12.0) | 10.0 | (3.0)
Variable Interest Entity, Nonconsolidated, assets at VIE |  | 36.0 | 121.0 |
Variable Interest Entity, Nonconsolidated, liabilities at VIE |  | 0.0 | 1.0 |
Contribution to non-consolidated VIE |  | 75.0 | 50.0 | 60.0
VIE equity earnings |  | (7.0) | 11.0 | (1.0)
Equity investment in non-consolidated VIE |  | 40.0 | 120.0 |
Investment Segment |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Other income (loss), net |  | (17.0) | $ (5.0) | (2.0)
Investment Segment | Purchases from related party | Hertz |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Amount of transaction with related party |  |  |  | $ 36.0
Brett Icahn |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Amount contributed in accordance with manager agreement |  | $ 12.0 |  |

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