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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, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Business Combination and Asset Acquisition [Abstract] |  |  |  |
Revenue | $ 7,562.4 | $ 6,579.9 | $ 14,588.3 | $ 11,331.5
Net income attributable to Lithia Motors, Inc. | $ 356.2 | $ 337.4 | $ 712.5 | $ 510.2
Basic earnings attributable to Lithia Motors, Inc. per share (in dollars per share) | $ 12.54 | $ 11.99 | $ 24.60 | $ 18.62
Diluted earnings attributable to Lithia Motors, Inc. per share (in dollars per share) | $ 12.46 | $ 11.89 | $ 24.48 | $ 18.47

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