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REVENUE RECOGNITION - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Revenues	$ 4,373.1	$ 4,246.2	$ 8,521.6	$ 8,447.4
New and used vehicle
Disaggregation of Revenue [Line Items]
Revenues	3,589.7	3,472.9	6,963.5	6,894.1
New vehicle
Disaggregation of Revenue [Line Items]
Revenues	2,303.9	2,164.9	4,442.0	4,229.1
Used vehicle retail
Disaggregation of Revenue [Line Items]
Revenues	1,129.4	1,167.2	2,208.3	2,358.5
Used vehicle wholesale
Disaggregation of Revenue [Line Items]
Revenues	156.3	140.9	313.2	306.4
Sale of vehicle parts and accessories
Disaggregation of Revenue [Line Items]
Revenues	124.4	125.2	249.9	258.9
Vehicle repair and maintenance services
Disaggregation of Revenue [Line Items]
Revenues	477.1	455.6	939.2	912.3
Parts and service
Disaggregation of Revenue [Line Items]
Revenues	601.5	580.9	1,189.1	1,171.2
Finance and insurance, net
Disaggregation of Revenue [Line Items]
Revenues	$ 182.0	$ 192.4	$ 368.9	$ 382.1

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