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SEGMENT INFORMATION - Segment Information (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Segment Reporting Information [Line Items]
Assets	$ 10,131.6	$ 10,337.0
Operating Segments
Segment Reporting Information [Line Items]
Assets	9,954.5	10,277.0
Operating Segments | Dealerships
Segment Reporting Information [Line Items]
Assets	8,961.6	9,227.6
Operating Segments | TCA
Segment Reporting Information [Line Items]
Assets	992.9	1,049.4
Intersegment Eliminations
Segment Reporting Information [Line Items]
Assets	$ 177.1	$ 60.1

X

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Amount of asset recognized for present right to economic benefit.

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