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ACQUISITIONS - Schedule of Pro Forma Summary of All Acquisitions (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract] |  |  |  |
Revenue | $ 9,276.3 | $ 9,496.4 | $ 18,361.9 | $ 17,753.0
Net income attributable to Lithia Motors, Inc. | $ 218.4 | $ 324.6 | $ 391.1 | $ 572.2
Basic earnings per share attributable to Lithia Motors, Inc. (in dollars per share) | $ 8.03 | $ 11.79 | $ 14.29 | $ 20.80
Diluted earnings per share attributable to Lithia Motors, Inc. (in dollars per share) | $ 8.02 | $ 11.77 | $ 14.27 | $ 20.76

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