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SEGMENT INFORMATION - Segment Information (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Segment Reporting Information [Line Items]
Assets	$ 10,221.0	$ 10,337.0
Operating Segments
Segment Reporting Information [Line Items]
Assets	10,040.2	10,277.0
Operating Segments | Dealerships
Segment Reporting Information [Line Items]
Assets	9,082.9	9,227.6
Operating Segments | TCA
Segment Reporting Information [Line Items]
Assets	957.2	1,049.4
Intersegment Eliminations
Segment Reporting Information [Line Items]
Assets	$ 180.8	$ 60.1

X

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Amount of asset recognized for present right to economic benefit.

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