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Segment Information (Details) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) item	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Segment Reporting Information
Number of reportable segments | item			4
Number of operating segments | item			6
Revenues and segment income by reportable segment
Revenues	$ 6,497.3	$ 5,971.6	$ 19,258.6	$ 14,631.8
Segment income	476.1	311.6	$ 1,187.4	444.3
Operating segments
Segment Reporting Information
Number of reportable segments | item			1
Retail automotive dealership
Revenues and segment income by reportable segment
Revenues	5,634.9	5,258.0	$ 17,039.4	12,828.1	$ 17,900.0
Retail automotive dealership | Operating segments
Revenues and segment income by reportable segment
Revenues	5,634.9	5,258.0	17,039.4	12,828.1
Segment income	299.6	215.4	772.9	268.5
Retail commercial truck dealership
Revenues and segment income by reportable segment
Revenues	717.3	590.9	1,777.3	1,481.5
Retail commercial truck dealership | Operating segments
Revenues and segment income by reportable segment
Revenues	717.3	590.9	1,777.3	1,481.5
Segment income	48.3	23.4	115.5	51.7
Other | Operating segments
Revenues and segment income by reportable segment
Revenues	145.1	122.7	441.9	322.2
Segment income	9.8	8.3	24.2	16.1
Non-Automotive Investments | Operating segments
Revenues and segment income by reportable segment
Segment income	$ 118.4	$ 64.5	$ 274.8	$ 108.0

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