Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2021	Dec. 31, 2023	Oct. 31, 2023	Sep. 01, 2022
Related Party Transaction [Line Items]
Non-controlling interests	$ 7.0			$ 6.0
Assets	33,528.0			32,569.0
Other (income) expense, net	(1.0)	$ 2.0
Vehicles, net	22,020.0			21,240.0
Vehicle, net investment in lease receivables	36.0			31.0
Other non-current assets	450.0			441.0
Avis Mobility Ventures LLC (AMV) | Receivables From Related Party | Related Party
Related Party Transaction [Line Items]
Vehicles, net	10.0			2.0
Avis Mobility Ventures LLC (AMV) | Avis Mobility Ventures LLC (AMV) | Related Party
Related Party Transaction [Line Items]
Other non-current assets	21.0			$ 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	2.0	8.0
Avis Mobility Ventures LLC (AMV) | Avis Mobility Ventures LLC (AMV) | Equipment Investment | Related Party
Related Party Transaction [Line Items]
Other (income) expense, net	3.0	$ 6.0
Subsidiary Equity
Related Party Transaction [Line Items]
Assets	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
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%	51.00%