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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, 2025 | Mar. 31, 2024
Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract] |  |
Revenue | $ 9,191.6 | $ 8,590.4
Net income attributable to Lithia Motors, Inc. | $ 211.3 | $ 165.4
Basic EPS attributable to Lithia Motors, Inc. common stockholders (in dollars per share) | $ 8.03 | $ 6.01
Diluted EPS attributable to Lithia Motors, Inc. common stockholders (in dollars per share) | $ 8.01 | $ 6.00

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