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REVENUE RECOGNITION - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue [Line Items]
Revenue	$ 4,246.2	$ 3,742.5	$ 8,447.4	$ 7,324.8
New and used vehicle
Disaggregation of Revenue [Line Items]
Revenue	3,472.9	3,050.0	6,894.1	5,944.2
New vehicle
Disaggregation of Revenue [Line Items]
Revenue	2,164.9	1,942.7	4,229.1	3,710.4
Used vehicle retail
Disaggregation of Revenue [Line Items]
Revenue	1,167.2	1,013.3	2,358.5	2,034.9
Used vehicle wholesale
Disaggregation of Revenue [Line Items]
Revenue	140.9	94.0	306.4	198.9
Sale of vehicle parts and accessories
Disaggregation of Revenue [Line Items]
Revenue	125.2	123.9	258.9	250.0
Vehicle repair and maintenance services
Disaggregation of Revenue [Line Items]
Revenue	455.6	402.2	912.3	791.7
Parts and service
Disaggregation of Revenue [Line Items]
Revenue	580.9	526.1	1,171.2	1,041.7
Finance and insurance, net
Disaggregation of Revenue [Line Items]
Revenue	$ 192.4	$ 166.3	$ 382.1	$ 338.9

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