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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
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract]
Revenue	$ 9,624.7	$ 9,318.8	$ 18,868.7	$ 17,960.8
Net income attributable to Lithia Motors, Inc.	$ 260.1	$ 219.5	$ 473.5	$ 387.0
Basic EPS attributable to Lithia Motors, Inc. common stockholders (in dollars per share)	$ 10.04	$ 8.07	$ 18.13	$ 14.14
Diluted EPS attributable to Lithia Motors, Inc. common stockholders (in dollars per share)	$ 10.02	$ 8.06	$ 18.10	$ 14.12

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