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ACQUISITIONS AND DIVESTITURES - Narrative (Details) $ in Millions |  | 3 Months Ended |
--- | --- | --- | ---
Feb. 14, 2025 USD ($) franchise dealership collisionCenter | Mar. 31, 2025 USD ($) dealership business franchise | Mar. 31, 2024 USD ($) franchise dealership business | Dec. 31, 2024 USD ($)
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 1,976.2 |  | $ 2,044.7
Number of businesses acquired | business |  | 0 | 0 |
Gain on divestitures, net |  | $ 4.1 | $ 0.0 |
Disposed of by sale | Delaware |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of dealership locations, sold (in dealership locations) | dealership |  |  | 1 |
Disposed of by sale | Delaware | Lexus Franchise |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of franchises, sold (in franchises) | franchise |  |  | 1 |
Disposed of by sale | Colorado | Nissan Franchise |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of franchises, sold (in franchises) | franchise |  | 1 |  |
Number of dealership locations, sold (in dealership locations) | dealership |  | 1 |  |
Disposed of by sale | SOUTH CAROLINA | Volvo Franchise |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of franchises, sold (in franchises) | franchise |  | 1 |  |
Number of dealership locations, sold (in dealership locations) | dealership |  | 1 |  |
Herb Chambers Dealerships |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Consideration to be transferred | $ 1,340.0 |  |  |
Goodwill | 750.0 |  |  |
Real estate and leasehold improvements to be acquired | $ 590.0 |  |  |
Dealerships to be acquired | dealership | 33 |  |  |
Franchises to be acquired | franchise | 52 |  |  |
Collision centers to be acquired | collisionCenter | 3 |  |  |
Put right obligation, period following closing | 5 years |  |  |

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