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Acquisitions - Pro Forma Summary of All Acquisitions (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Business Combination and Asset Acquisition [Abstract]    
Revenue $ 6,724.4 $ 4,396.2
Net income attributable to Lithia Motors, Inc. $ 345.5 $ 160.2
Basic earnings attributable to Lithia Motors, Inc. per share (in dollars per share) $ 11.70 $ 6.02
Diluted earnings attributable to Lithia Motors, Inc. per share (in dollars per share) $ 11.66 $ 5.96