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REVENUE RECOGNITION - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Revenues	$ 4,800.9	$ 4,236.7	$ 13,322.5	$ 12,684.1
New and used vehicle
Disaggregation of Revenue [Line Items]
Revenues	3,941.1	3,458.2	10,904.7	10,352.3
New vehicle
Disaggregation of Revenue [Line Items]
Revenues	2,528.9	2,163.5	6,970.9	6,392.6
Used vehicle retail
Disaggregation of Revenue [Line Items]
Revenues	1,226.8	1,148.5	3,435.1	3,507.0
Used vehicle wholesale
Disaggregation of Revenue [Line Items]
Revenues	185.5	146.2	498.7	452.6
Sale of vehicle parts and accessories
Disaggregation of Revenue [Line Items]
Revenues	132.0	129.2	382.0	388.2
Vehicle repair and maintenance services
Disaggregation of Revenue [Line Items]
Revenues	527.4	463.9	1,466.5	1,376.1
Parts and services
Disaggregation of Revenue [Line Items]
Revenues	659.4	593.1	1,848.5	1,764.3
Finance and insurance, net
Disaggregation of Revenue [Line Items]
Revenues	$ 200.3	$ 185.4	$ 569.3	$ 567.5

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