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ACQUISITIONS AND DIVESTITURES - Pro Forma Information (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Franchise rights |  |
Business Acquisition [Line Items] |  |
Goodwill and intangible asset impairment | $ 117.2 |
Jim Koons Dealerships |  |
Business Acquisition [Line Items] |  |
Pro forma revenue | 17,540.4 | $ 18,516.1
Pro forma net income | $ 660.8 | $ 1,092.9

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