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ACQUISITIONS AND DIVESTITURES - Narrative (Details) $ in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Dec. 11, 2023 USD ($) newVehicleDealership collisionCenter | Dec. 31, 2023 USD ($) | Sep. 30, 2024 USD ($) | Jun. 30, 2024 USD ($) | Mar. 31, 2024 USD ($) | Sep. 30, 2023 USD ($) | Jun. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) | Sep. 30, 2024 USD ($) acquisition dealership franchise | Sep. 30, 2023 USD ($) franchise dealership acquisition
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ 2,009.0 | $ 2,011.3 |  |  |  |  |  | $ 2,011.3 |
Revenue |  |  | 4,236.7 |  |  | $ 3,666.2 |  |  | 12,684.1 | $ 10,991.0
Net income |  |  | 126.3 | $ 28.1 | $ 147.1 | 169.2 | $ 196.4 | $ 181.4 | $ 301.5 | $ 547.0
Number of businesses acquired | acquisition |  |  |  |  |  |  |  |  | 0 | 0
Gain on divestitures |  |  | $ 5.0 |  |  | $ 0.0 |  |  | $ 8.6 | $ 13.5
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 |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of dealership locations, sold (in dealership locations) | dealership |  |  |  |  |  |  |  |  | 1 |
Disposed of by sale | Colorado | Nissan Franchise |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of franchises, sold (in franchises) | franchise |  |  |  |  |  |  |  |  | 1 |
Disposed of by sale | Georgia |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
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) | franchise |  |  |  |  |  |  |  |  | 1 |
Disposed of by sale | Georgia | Chevrolet Franchise |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of franchises, sold (in franchises) | franchise |  |  |  |  |  |  |  |  | 1 |
Disposed of by sale | Texas |  |  |  |  |  |  |  |  |  |
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 | Washington |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of dealership locations, sold (in dealership locations) | dealership |  |  |  |  |  |  |  |  | 1 |
Disposed of by sale | Washington | Honda Franchise |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of franchises, sold (in franchises) | franchise |  |  |  |  |  |  |  |  | 1 |
Jim Koons Dealerships |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of new vehicle dealerships acquired | newVehicleDealership | 20 |  |  |  |  |  |  |  |  |
Number of collision centers acquired (in collision repair centers) | collisionCenter | 6 |  |  |  |  |  |  |  |  |
Aggregate purchase price | $ 1,504.5 |  |  |  |  |  |  |  |  |
Intangible franchise rights | 430.3 |  |  |  |  |  |  |  |  |
Goodwill | 239.9 |  |  |  |  |  |  |  |  |
Revenue |  | 2,110.1 |  |  |  |  |  |  |  |
Net income |  | $ 67.9 |  |  |  |  |  |  |  |
Jim Koons Dealerships | Disposed of by sale |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate purchase price | $ 100.9 |  |  |  |  |  |  |  |  |

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