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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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-Publisher FASB
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