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SEGMENT INFORMATION (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) segment	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)
Business Acquisition [Line Items]
Number of reportable segments | segment			2
Revenue	$ 4,246.2	$ 3,742.5	$ 8,447.4	$ 7,324.8
Gross profit	730.7	713.1	1,480.7	1,409.3
Total assets	10,306.0		10,306.0		$ 10,159.4
Intersegment Eliminations
Business Acquisition [Line Items]
Revenue	(48.7)	(46.4)	(100.6)	(91.0)
Gross profit	3.8	7.5	0.9	2.9
Total assets	55.8		55.8		46.1
Dealerships | Operating Segments
Business Acquisition [Line Items]
Revenue	4,219.5	3,718.8	8,398.5	7,275.1
Gross profit	706.8	686.0	1,438.6	1,365.6
Total assets	9,239.2		9,239.2		9,199.4
TCA | Operating Segments
Business Acquisition [Line Items]
Revenue	75.4	70.1	149.5	140.7
Gross profit	20.1	$ 19.6	41.2	$ 40.8
Total assets	$ 1,010.9		$ 1,010.9		$ 913.9

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Reference 23: http://www.xbrl.org/2003/role/disclosureRef
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