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Segment Information (Revenues and Segment Income) (Details) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) segments	Jun. 30, 2023 USD ($) segments
Segment Reporting [Abstract]
Number of reportable segments | segments				3	3
Segment Reporting Information [Line Items]
Revenues		$ 6,480.4	$ 6,890.1	$ 12,966.1	$ 13,288.8
Segment income	[1]	300.4	510.3	676.0	1,016.0
Domestic
Segment Reporting Information [Line Items]
Revenues		1,739.4	1,955.5	3,496.1	3,786.6
Segment income	[1]	50.3	115.8	125.5	234.3
Import
Segment Reporting Information [Line Items]
Revenues		2,018.8	1,997.7	3,998.3	3,787.0
Segment income	[1]	108.2	173.0	237.0	333.4
Premium Luxury
Segment Reporting Information [Line Items]
Revenues		2,398.4	2,620.5	4,813.3	5,105.4
Segment income	[1]	$ 141.9	$ 221.5	$ 313.5	$ 448.3
[1] (1) Segment income represents income for each of our reportable segments and is defined as operating income less floorplan interest expense.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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