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Segment Information (Details) $ in Millions		3 Months Ended
		Mar. 31, 2022 USD ($) segments	Mar. 31, 2021 USD ($) segments
Segment Reporting Information [Line Items]
Number of reportable segments | segments		3	3
Revenues		$ 6,752.8	$ 5,903.8
Segment Income		565.1	402.9
AN Reportable Segment, Domestic [Member]
Segment Reporting Information [Line Items]
Revenues		2,034.4	1,846.7
Segment Income	[1]	149.4	118.5
AN Reportable Segment, Import [Member]
Segment Reporting Information [Line Items]
Revenues		1,974.1	1,769.6
Segment Income	[1]	186.2	125.9
AN Reportable Segment, Premium Luxury [Member]
Segment Reporting Information [Line Items]
Revenues		2,478.7	2,103.5
Segment Income	[1]	$ 229.5	$ 158.5
[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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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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