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FLOOR PLAN NOTES PAYABLE - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2025	Apr. 09, 2025	Apr. 08, 2025	Dec. 31, 2024
Floor Plan Notes Payable [Line Items]
Debt instrument, conversion, maximum convertible amount, amount subtracted from contractual total	$ 50.0
Loaner Vehicle Notes Payable - Bank of America
Floor Plan Notes Payable [Line Items]
Notes payable	69.6			$ 56.7
Loaner Vehicle Floorplan Facility
Floor Plan Notes Payable [Line Items]
Notes payable	$ 202.9			$ 161.5
2023 Senior Credit Facility | Line of Credit | Revolving credit facility
Floor Plan Notes Payable [Line Items]
Line of credit facility, maximum borrowing capacity		$ 925.0	$ 500.0
2023 Senior Credit Facility | Line of Credit | New vehicle floor plan facility
Floor Plan Notes Payable [Line Items]
Line of credit facility, maximum borrowing capacity		$ 2,250.0	$ 1,930.0

X

- Definition

Debt Instrument, Conversion, Maximum Convertible Amount, Amount Subtracted from Contractual Total

+ References

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- Definition

Floor Plan Notes Payable [Line Items]

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
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-Subparagraph (SX 210.5-02(22)(b))
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- Definition

Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
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-Section S99
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