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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Earnings Per Share [Abstract]    
Net income attributable to Lithia Motors, Inc. and applicable to common stockholders $ 228.7 $ 342.2
Weighted average common shares outstanding - basic (in shares) 27.5 29.5
Effect of employee stock purchases and restricted stock units on weighted average common shares (in shares) 0.0 0.1
Weighted average common shares outstanding – diluted (in shares) 27.5 29.6
Basic earnings per share attributable to Lithia Motors, Inc. (in dollars per share) $ 8.32 $ 11.59
Diluted earnings per share attributable to Lithia Motors, Inc. (in dollars per share) $ 8.30 $ 11.55