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Segment Information (Revenues and Segment Income) (Details) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) segments	Sep. 30, 2022 USD ($) segments
Segment Reporting [Abstract]
Number of reportable segments | segments				3	3
Segment Reporting Information [Line Items]
Revenues		$ 6,892.7	$ 6,666.0	$ 20,181.5	$ 20,288.0
Segment income	[1]	464.8	558.2	1,480.8	1,726.4
Domestic
Segment Reporting Information [Line Items]
Revenues		1,983.9	2,032.8	5,770.5	6,108.1
Segment income	[1]	107.2	142.7	341.5	445.2
Import
Segment Reporting Information [Line Items]
Revenues		2,077.2	1,875.2	5,864.2	5,799.0
Segment income	[1]	164.7	180.3	498.1	559.0
Premium Luxury
Segment Reporting Information [Line Items]
Revenues		2,516.1	2,506.4	7,621.5	7,601.7
Segment income	[1]	$ 192.9	$ 235.2	$ 641.2	$ 722.2
[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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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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