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Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Weighted average common shares outstanding - basic (in shares) 29,500 26,600
Shares used in diluted per share calculations (in shares) 29,600 26,900
Basic earnings per share attributable to Lithia Motors, Inc. (in dollars per share) $ 11.59 $ 5.86
Diluted earnings per share attributable to Lithia Motors, Inc. (in dollars per share) $ 11.55 $ 5.81
Common Stock    
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Net income attributable to Lithia Motors, Inc. and applicable to common stockholders - basic $ 342.2  
Conversion of Class B common shares into Class A common shares 0.0  
Net income attributable to Lithia Motors, Inc. and applicable to common stockholders - diluted $ 342.2  
Weighted average common shares outstanding - basic (in shares) 29,500  
Conversion of Class B common shares into Class A common shares (in shares) 0  
Effect of employee stock purchases and restricted stock units on weighted average common shares (in shares) 100  
Shares used in diluted per share calculations (in shares) 29,600  
Basic earnings per share attributable to Lithia Motors, Inc. (in dollars per share) $ 11.59  
Diluted earnings per share attributable to Lithia Motors, Inc. (in dollars per share) $ 11.55  
Class A common stock    
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Net income attributable to Lithia Motors, Inc. and applicable to common stockholders - basic   $ 155.8
Conversion of Class B common shares into Class A common shares   0.4
Net income attributable to Lithia Motors, Inc. and applicable to common stockholders - diluted   $ 156.2
Weighted average common shares outstanding - basic (in shares)   26,600
Conversion of Class B common shares into Class A common shares (in shares)   100
Effect of employee stock purchases and restricted stock units on weighted average common shares (in shares)   200
Shares used in diluted per share calculations (in shares)   26,900
Basic earnings per share attributable to Lithia Motors, Inc. (in dollars per share)   $ 5.86
Diluted earnings per share attributable to Lithia Motors, Inc. (in dollars per share)   $ 5.81
Class B common stock    
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Net income attributable to Lithia Motors, Inc. and applicable to common stockholders - basic   $ 0.4
Conversion of Class B common shares into Class A common shares   0.0
Net income attributable to Lithia Motors, Inc. and applicable to common stockholders - diluted   $ 0.4
Weighted average common shares outstanding - basic (in shares)   100
Conversion of Class B common shares into Class A common shares (in shares)   0
Effect of employee stock purchases and restricted stock units on weighted average common shares (in shares)   0
Shares used in diluted per share calculations (in shares)   100
Basic earnings per share attributable to Lithia Motors, Inc. (in dollars per share)   $ 5.86
Diluted earnings per share attributable to Lithia Motors, Inc. (in dollars per share)   $ 5.81