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Segment Information (Revenues and Segment Income) (Details) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) segments	Jun. 30, 2022 USD ($) segments
Segment Reporting [Abstract]
Number of reportable segments | segments				3	3
Segment Reporting Information [Line Items]
Revenues		$ 6,890.1	$ 6,869.2	$ 13,288.8	$ 13,622.0
Segment income		510.3	603.1	1,016.0	1,168.2
Domestic
Segment Reporting Information [Line Items]
Revenues		1,955.5	2,040.9	3,786.6	4,075.3
Segment income	[1]	115.8	153.1	234.3	302.5
Import
Segment Reporting Information [Line Items]
Revenues		1,997.7	1,949.7	3,787.0	3,923.8
Segment income	[1]	173.0	192.5	333.4	378.7
Premium Luxury
Segment Reporting Information [Line Items]
Revenues		2,620.5	2,616.6	5,105.4	5,095.3
Segment income	[1]	$ 221.5	$ 257.5	$ 448.3	$ 487.0
[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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Represents operating income less floorplan interest expense for each of the reportable segments.

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