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ACQUISITIONS AND DIVESTITURES - Narrative (Details) $ in Millions |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 11, 2023 USD ($) collisionCenter | Dec. 31, 2023 USD ($) | Dec. 31, 2024 USD ($) franchise dealership | Dec. 31, 2023 USD ($) dealership franchise | Dec. 31, 2022 USD ($) franchise dealership center
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  | $ 2,009.0 | $ 2,044.7 | $ 2,009.0 | $ 1,783.4
Acquisition related costs |  |  | 4.1 |  |
Revenues |  |  | 17,188.6 | 14,802.7 | 15,433.8
Net income |  |  | $ 430.3 | $ 602.5 | 997.3
Number of dealership locations, sold (in dealership locations) | dealership |  |  | 5 | 1 |
Gain on dealership divestitures, net |  |  | $ 8.6 | $ 13.5 | $ 207.1
Colorado | Disposed of by Sale |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of franchises, sold (in franchises) | franchise |  |  | 1 |  | 3
Number of dealership locations, sold (in dealership locations) | dealership |  |  | 1 |  | 3
Number of collision centers, sold (in collision centers) | center |  |  |  |  | 1
MISSOURI | Disposed of by Sale |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of franchises, sold (in franchises) | franchise |  |  |  |  | 1
Number of dealership locations, sold (in dealership locations) | dealership |  |  |  |  | 1
WASHINGTON | Disposed of by Sale |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of franchises, sold (in franchises) | franchise |  |  | 1 |  | 2
Number of dealership locations, sold (in dealership locations) | dealership |  |  | 1 |  | 2
NEW MEXICO | Disposed of by Sale |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of franchises, sold (in franchises) | franchise |  |  |  |  | 1
Number of dealership locations, sold (in dealership locations) | dealership |  |  |  |  | 1
NORTH CAROLINA | Disposed of by Sale |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of franchises, sold (in franchises) | franchise |  |  |  |  | 11
Number of dealership locations, sold (in dealership locations) | dealership |  |  |  |  | 9
Number of collision centers, sold (in collision centers) | center |  |  |  |  | 2
Texas | Disposed of by Sale |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of franchises, sold (in franchises) | franchise |  |  |  | 1 |
Number of dealership locations, sold (in dealership locations) | dealership |  |  |  | 1 |
DELAWARE | Disposed of by Sale |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of franchises, sold (in franchises) | franchise |  |  | 1 |  |
Number of dealership locations, sold (in dealership locations) | dealership |  |  | 1 |  |
GEORGIA | Disposed of by Sale | Nissan |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of franchises, sold (in franchises) | franchise |  |  | 1 |  |
Number of dealership locations, sold (in dealership locations) | dealership |  |  | 1 |  |
GEORGIA | Disposed of by Sale | Chevrolet |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of franchises, sold (in franchises) | franchise |  |  | 1 |  |
Number of dealership locations, sold (in dealership locations) | dealership |  |  | 1 |  |
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 |  |  |  |
Assets held for sale | 100.9 |  |  |  |
Intangible franchise rights | 401.0 |  |  |  |
Goodwill | 272.4 |  |  |  |
Revenues |  | 2,805.5 |  |  |
Net income |  | $ 86.9 |  |  |
Payments to acquire businesses, gross | 941.3 |  |  |  |
Goodwill, measurement period adjustment |  |  | $ 26.7 |  |
Jim Koons Dealerships | New Floor Plan Facility |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Aggregate purchase price | $ 256.1 |  |  |  |
Series of Individually Immaterial Business Acquisitions | Colorado |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill and manufacturer franchise rights, period for federal and state tax deductions |  |  |  | 15 years |

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