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ACQUISITIONS AND DIVESTITURES - Narrative (Details) $ in Millions |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jul. 21, 2025 USD ($) dealership collisionCenter franchise | Jun. 30, 2025 USD ($) property | Jun. 30, 2024 USD ($) | Jun. 30, 2025 USD ($) franchise business dealership property | Jun. 30, 2024 USD ($) dealership business franchise | Dec. 31, 2024 USD ($) property
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill | $ |  | $ 1,974.7 |  | $ 1,974.7 |  | $ 2,044.7
Number of businesses acquired | business |  |  |  | 0 | 0 |
Gain on divestitures, net | $ |  | $ 5.9 | $ 3.6 | $ 10.1 | $ 3.6 |
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) |  |  |  |  | 1 |
Disposed of by sale | Colorado | Nissan Franchise |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of franchises, sold (in franchises) |  |  |  | 1 | 1 |
Number of dealership locations, sold (in dealership locations) | dealership |  |  |  | 1 | 1 |
Disposed of by sale | SOUTH CAROLINA | Volvo Franchise |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of franchises, sold (in franchises) |  |  |  | 1 |  |
Number of dealership locations, sold (in dealership locations) | dealership |  |  |  | 1 |  |
Disposed of by sale | CALIFORNIA | Toyota Franchise |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of franchises, sold (in franchises) |  |  |  | 2 |  |
Number of dealership locations, sold (in dealership locations) | dealership |  |  |  | 2 |  |
Disposed of by sale | UTAH |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of franchises, sold (in franchises) |  |  |  | 3 |  |
Disposed of by sale | UTAH | Chevrolet Franchise |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of franchises, sold (in franchises) |  |  |  | 1 |  |
Number of dealership locations, sold (in dealership locations) | dealership |  |  |  | 1 |  |
Disposed of by sale | UTAH | Chrysler Jeep Dodge Ram Franchise |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of franchises, sold (in franchises) |  |  |  | 1 |  |
Number of dealership locations, sold (in dealership locations) | dealership |  |  |  | 1 |  |
Disposed of by sale | UTAH | Ford Franchise |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of franchises, sold (in franchises) |  |  |  | 1 |  |
Number of dealership locations, sold (in dealership locations) | dealership |  |  |  | 1 |  |
Disposed of by sale | GEORGIA | Nissan Franchise |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of franchises, sold (in franchises) |  |  |  |  | 1 |
Number of dealership locations, sold (in dealership locations) | dealership |  |  |  |  | 1 |
Held-for-sale | Real Estate |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of assets held-for-sale | property |  | 2 |  | 2 |  | 1
Herb Chambers Dealerships |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition related costs | $ |  |  |  | $ 5.1 |  |
Herb Chambers Dealerships | Subsequent Event |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Aggregate purchase price | $ | $ 1,820.0 |  |  |  |  |
Goodwill | $ | 750.0 |  |  |  |  |
Real estate and leasehold improvements acquired | $ | 610.0 |  |  |  |  |
New vehicles, used vehicles, service loaner vehicles, fixed assets and parts and supplies | $ | $ 460.0 |  |  |  |  |
Dealerships acquired | dealership | 33 |  |  |  |  |
Franchises acquired | 52 |  |  |  |  |
Collision centers acquired | collisionCenter | 3 |  |  |  |  |

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