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GOODWILL AND INTANGIBLE FRANCHISE RIGHTS - Narrative (Details) $ in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 11, 2023 USD ($) collisionCenter | Dec. 31, 2024 USD ($) | Jun. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 17, 2021 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill acquired |  |  |  | $ 40.9 | $ 240.8 |  |
Goodwill |  | $ 2,044.7 |  | 2,044.7 | 2,009.0 | $ 1,783.4 |
Asset impairments |  |  |  | 149.5 | 117.2 | $ 0.0 |
Franchise rights |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets acquired |  |  |  | 26.7 | 429.0 |  |
Goodwill and intangible asset impairment |  |  |  | 117.2 |  |  |
Asset impairments |  | $ 14.1 | $ 134.1 | 148.2 | $ 102.3 |  |
Non-cash, impairment of intangible assets, finite-lived, pre-tax |  |  |  | $ 73.1 |  |  |
LHM Acquisition |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets |  |  |  |  |  |  | $ 5.6
Jim Koons Dealerships |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of new vehicle dealerships acquired (in new vehicle dealerships) | collisionCenter | 20 |  |  |  |  |  |
Number of collision centers acquired (in collision centers) | collisionCenter | 6 |  |  |  |  |  |
Aggregate purchase price | $ 1,504.5 |  |  |  |  |  |
Goodwill | 272.4 |  |  |  |  |  |
Intangible franchise rights | $ 401.0 |  |  |  |  |  |

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