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REVENUE RECOGNITION - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Disaggregation of Revenue [Line Items]
Revenues	$ 4,148.5	$ 4,201.2
New and used vehicle
Disaggregation of Revenue [Line Items]
Revenues	3,373.9	3,421.2
New vehicle
Disaggregation of Revenue [Line Items]
Revenues	2,138.1	2,064.3
Used vehicle retail
Disaggregation of Revenue [Line Items]
Revenues	1,078.9	1,191.4
Used vehicle wholesale
Disaggregation of Revenue [Line Items]
Revenues	156.9	165.5
Sale of vehicle parts and accessories
Disaggregation of Revenue [Line Items]
Revenues	125.5	133.7
Vehicle repair and maintenance services
Disaggregation of Revenue [Line Items]
Revenues	462.1	456.6
Parts and service
Disaggregation of Revenue [Line Items]
Revenues	587.6	590.4
Finance and insurance, net
Disaggregation of Revenue [Line Items]
Revenues	$ 187.0	$ 189.7

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