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ACQUISITIONS - Schedule of Pro Forma Summary of All Acquisitions (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Business Combination and Asset Acquisition [Abstract] |  |
Revenue | $ 9,024.4 | $ 8,197.2
Net income attributable to Lithia Motors, Inc. | $ 170.8 | $ 245.7
Basic earnings per share attributable to Lithia Motors, Inc. (in dollars per share) | $ 6.20 | $ 8.94
Diluted earnings per share attributable to Lithia Motors, Inc. (in dollars per share) | $ 6.19 | $ 8.92

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