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REVENUE RECOGNITION - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Revenue	$ 4,236.7	$ 3,666.2	$ 12,684.1	$ 10,991.0
New and used vehicle
Disaggregation of Revenue [Line Items]
Revenue	3,458.2	2,973.6	10,352.3	8,917.8
New vehicle
Disaggregation of Revenue [Line Items]
Revenue	2,163.5	1,861.9	6,392.6	5,572.2
Used vehicle retail
Disaggregation of Revenue [Line Items]
Revenue	1,148.5	1,016.8	3,507.0	3,051.8
Used vehicle wholesale
Disaggregation of Revenue [Line Items]
Revenue	146.2	94.9	452.6	293.8
Sale of vehicle parts and accessories
Disaggregation of Revenue [Line Items]
Revenue	129.2	125.1	388.2	375.0
Vehicle repair and maintenance services
Disaggregation of Revenue [Line Items]
Revenue	463.9	401.4	1,376.1	1,193.1
Parts and service
Disaggregation of Revenue [Line Items]
Revenue	593.1	526.5	1,764.3	1,568.2
Finance and insurance, net
Disaggregation of Revenue [Line Items]
Revenue	$ 185.4	$ 166.1	$ 567.5	$ 505.0

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