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ACQUISITIONS - Schedule of Pro Forma Summary of All Acquisitions (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract]
Revenue	$ 9,710.7	$ 9,356.8	$ 28,667.1	$ 27,403.0
Net income attributable to Lithia Motors, Inc.	$ 219.1	$ 224.8	$ 693.8	$ 612.9
Basic EPS attributable to Lithia Motors, Inc. common stockholders (in dollars per share)	$ 8.71	$ 8.41	$ 26.89	$ 22.57
Diluted EPS attributable to Lithia Motors, Inc. common stockholders (in dollars per share)	$ 8.69	$ 8.39	$ 26.85	$ 22.53

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