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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Earnings Per Share [Abstract]      
Net income attributable to Lithia Motors, Inc. $ 1,000.8 $ 1,251.0 $ 1,060.1
Weighted average common shares outstanding – basic (in shares) 27.5 28.2 28.8
Effect of employee stock purchases and restricted stock units on weighted average common shares (in shares) 0.1 0.1 0.2
Weighted average common shares outstanding – diluted (in shares) 27.6 28.3 29.0
Basic earnings per share attributable to Lithia Motors, Inc. (in dollars per share) $ 36.36 $ 44.38 $ 36.81
Diluted earnings per share attributable to Lithia Motors, Inc. (in dollars per share) $ 36.29 $ 44.17 $ 36.54