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SEGMENT INFORMATION - Segment Information (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Segment Reporting Information [Line Items]
Assets	$ 11,773.5	$ 10,337.0
Operating Segments
Segment Reporting Information [Line Items]
Assets	11,595.2	10,277.0
Operating Segments | Dealerships
Segment Reporting Information [Line Items]
Assets	10,575.0	9,227.6
Operating Segments | TCA
Segment Reporting Information [Line Items]
Assets	1,020.2	1,049.4
Intersegment Eliminations
Segment Reporting Information [Line Items]
Assets	$ 178.3	$ 60.1

X

- Definition

Amount of asset recognized for present right to economic benefit.

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