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ACQUISITIONS - Pro Forma Summary of All Acquisitions (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Business Combination and Asset Acquisition [Abstract] |  |  |  |
Revenue | $ 8,400.0 | $ 8,147.1 | $ 16,116.9 | $ 15,695.7
Net income attributable to Lithia Motors, Inc. | $ 314.5 | $ 363.2 | $ 567.9 | $ 732.7
Basic earnings attributable to Lithia Motors, Inc. per share (in dollars per share) | $ 11.42 | $ 12.79 | $ 20.64 | $ 25.29
Diluted earnings attributable to Lithia Motors, Inc. per share (in dollars per share) | $ 11.41 | $ 12.71 | $ 20.60 | $ 25.17

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