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ACQUISITIONS AND DIVESTITURES - Narrative (Details) $ in Millions |  | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Dec. 11, 2023 USD ($) collisionCenter newVehicleDealership | Dec. 31, 2023 USD ($) | Jun. 30, 2024 USD ($) | Mar. 31, 2024 USD ($) | Jun. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) | Jun. 30, 2024 USD ($) acquisition franchise dealership | Jun. 30, 2023 USD ($) dealership acquisition franchise
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill |  | $ 2,009.0 | $ 2,010.4 |  |  |  | $ 2,010.4 |
Revenue |  |  | 4,246.2 |  | $ 3,742.5 |  | 8,447.4 | $ 7,324.8
Net income |  |  | 28.1 | $ 147.1 | 196.4 | $ 181.4 | $ 175.2 | $ 377.7
Number of businesses acquired | acquisition |  |  |  |  |  |  | 0 | 0
Gain on divestitures |  |  | $ 3.6 |  | $ 13.5 |  | $ 3.6 | $ 13.5
Disposed of by sale | Delaware |  |  |  |  |  |  |  |
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 | Colorado |  |  |  |  |  |  |  |
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 | Georgia |  |  |  |  |  |  |  |
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 | Texas |  |  |  |  |  |  |  |
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 | 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 | 238.9 |  |  |  |  |  |  |
Revenue |  | 1,406.7 |  |  |  |  |  |
Net income |  | $ 49.2 |  |  |  |  |  |
Jim Koons Dealerships | Disposed of by sale |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Aggregate purchase price | $ 100.9 |  |  |  |  |  |  |

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