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Arrangements With New Hertz Arrangements With New Hertz (Details) - New Hertz - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Separation and Distribution Agreement |  |  |
Related Party Transaction [Line Items] |  |  |
Cash transfers |  |  | $ 2,100.0
Transition Services Agreement |  |  |
Related Party Transaction [Line Items] |  |  |
Incurred expenses with related party | $ 18.4 |  |
Intellectual Property Agreement |  |  |
Related Party Transaction [Line Items] |  |  |
Royalty-free period |  | 4 years |

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