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ACQUISITIONS AND DISPOSITIONS - Other Acquisitions and Dispositions (Details) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 01, 2024 USD ($) dealership center | Mar. 31, 2025 USD ($) franchise dealership | Mar. 31, 2024 USD ($) dealership center | Dec. 31, 2024 USD ($)
Business Acquisition |  |  |  |
Goodwill |  | $ 2,076.5 |  | $ 2,057.9
Asset impairments |  | 1.5 | $ 0.0 |
Disposed of by Sale |  |  |  |
Business Acquisition |  |  |  |
Dispositions reduced goodwill |  |  | $ 39.8 |
Held-for-sale |  |  |  |
Business Acquisition |  |  |  |
Goodwill |  | 6.7 |  | 11.5
Intangible asset impairment |  |  |  | $ 4.8
Gain on disposition of intangible assets |  | $ 2.3 |  |
Inchcape plc’s |  |  |  |
Business Acquisition |  |  |  |
Number of dealerships acquired | dealership | 54 |  |  |
Aggregate consideration paid for dealerships | $ 517.0 |  |  |
Goodwill | $ 121.7 |  |  |
Number of collision centers | center | 3 |  |  |
U.K. |  |  |  |
Business Acquisition |  |  |  |
Number of dealerships acquired | dealership |  | 4 |  |
Number of dealerships | dealership |  | 2 |  |
Asset impairments |  | $ 2.7 |  |
U.K. | Toyota Dealerships |  |  |  |
Business Acquisition |  |  |  |
Number of dealerships acquired | dealership |  | 3 |  |
U.K. | Lexus Dealership |  |  |  |
Business Acquisition |  |  |  |
Number of dealerships acquired | dealership |  | 1 |  |
U.K. | 2025 Business Acquisitions |  |  |  |
Business Acquisition |  |  |  |
Aggregate consideration paid for dealerships |  | $ 16.4 |  |
Goodwill |  | 2.4 |  |
U.S. |  |  |  |
Business Acquisition |  |  |  |
Number of dealerships acquired | dealership |  |  | 9 |
Aggregate consideration paid for dealerships |  |  | $ 690.4 |
Goodwill |  |  | 288.3 |
U.S. | Disposed of by Sale |  |  |  |
Business Acquisition |  |  |  |
Net pre-tax gain on dealership dispositions |  | $ 1.6 | $ 30.9 |
Number of dealerships | dealership |  | 1 | 6 |
Dispositions reduced goodwill |  | $ 4.6 |  |
Number of franchises | franchise |  | 4 |  |
U.S. | Lexus Dealership |  |  |  |
Business Acquisition |  |  |  |
Number of dealerships acquired | dealership |  |  | 2 |
U.S. | Inchcape plc’s |  |  |  |
Business Acquisition |  |  |  |
Number of collision centers | center |  |  | 3 |
U.S. | Honda Dealership |  |  |  |
Business Acquisition |  |  |  |
Number of dealerships acquired | dealership |  |  | 3 |
U.S. | Toyota Dealership |  |  |  |
Business Acquisition |  |  |  |
Number of dealerships acquired | dealership |  |  | 1 |
U.S. | Kia Dealership |  |  |  |
Business Acquisition |  |  |  |
Number of dealerships acquired | dealership |  |  | 1 |
U.S. | Hyundai Dealership |  |  |  |
Business Acquisition |  |  |  |
Number of dealerships acquired | dealership |  |  | 1 |
U.S. | Mercedes-Benz Dealership |  |  |  |
Business Acquisition |  |  |  |
Number of dealerships acquired | dealership |  |  | 1 |
U.S. | Toyota Certified Pre-Owned Center |  |  |  |
Business Acquisition |  |  |  |
Number of certified pre-owned center | center |  |  | 1 |

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