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Related Party Transactions (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2021	Dec. 31, 2023	Oct. 31, 2023	Aug. 31, 2023	Sep. 01, 2022
Related Party Transaction [Line Items]
Non-controlling interests	$ 8.0	$ 8.0		$ 8.0			$ 6.0
Assets	33,882.0	33,882.0		33,882.0			32,569.0
Other (income) expense, net		(2.0)	$ (4.0)	(3.0)	$ (2.0)
Vehicles, net	22,474.0	22,474.0		22,474.0			21,240.0
Vehicle, net investment in lease receivables	80.0	80.0		80.0			31.0
Other non-current assets	445.0	445.0		445.0			441.0
Avis Mobility Ventures LLC (AMV) \| Receivables From Related Party \| Related Party
Related Party Transaction [Line Items]
Vehicles, net	3.0	3.0		3.0			2.0
Avis Mobility Ventures LLC (AMV) \| Avis Mobility Ventures LLC (AMV) \| Related Party
Related Party Transaction [Line Items]
Other non-current assets	31.0	31.0		31.0			$ 24.0
Avis Mobility Ventures LLC (AMV) \| Avis Mobility Ventures LLC (AMV) \| Administrative Services \| Related Party
Related Party Transaction [Line Items]
Other (income) expense, net		0.0	6.0	2.0	14.0
Avis Mobility Ventures LLC (AMV) \| Avis Mobility Ventures LLC (AMV) \| Equipment Investment \| Related Party
Related Party Transaction [Line Items]
Other (income) expense, net		2.0	$ 10.0	5.0	$ 16.0
Subsidiary Equity
Related Party Transaction [Line Items]
Assets	49.0	$ 49.0		49.0
Gain on deconsolidation				$ 10.0
Subsidiary Equity \| SRS Mobility Ventures, LLC
Related Party Transaction [Line Items]
Contributions from non-controlling interests						$ 37.5
Non-controlling interests										$ 62.0
Capital contribution made	22.2
Decrease from receivables forgiveness	$ 11.7
Subsidiary Equity \| SRS Mobility Ventures, LLC \| Company Subsidiary
Related Party Transaction [Line Items]
Ownership acquired percentage						33.34%
Subsidiary Equity \| SRS Mobility Ventures, LLC \| Maximum \| Company Subsidiary
Related Party Transaction [Line Items]
Ownership interest	65.00%	65.00%		65.00%				65.00%	65.00%	51.00%