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Segment Information (Revenues and Segment Income) (Details) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) segments	Sep. 30, 2023 USD ($) segments
Segment Reporting [Abstract]
Number of reportable segments | segments				3	3
Segment Reporting Information [Line Items]
Revenues		$ 6,586.1	$ 6,892.7	$ 19,552.2	$ 20,181.5
Segment income	[1]	336.3	464.8	1,012.3	1,480.8
Domestic
Segment Reporting Information [Line Items]
Revenues		1,774.9	1,983.9	5,271.0	5,770.5
Segment income	[1]	62.4	107.2	187.9	341.5
Import
Segment Reporting Information [Line Items]
Revenues		2,046.2	2,077.2	6,044.5	5,864.2
Segment income	[1]	119.2	164.7	356.2	498.1
Premium Luxury
Segment Reporting Information [Line Items]
Revenues		2,426.0	2,516.1	7,239.3	7,621.5
Segment income	[1]	$ 154.7	$ 192.9	$ 468.2	$ 641.2
[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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