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Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Weighted average common shares outstanding - basic (in shares) | 30.3 | 22.9 | 28.4 | 23.0
Shares used in diluted per share calculations (in shares) | 30.5 | 23.1 | 28.6 | 23.2
Basic earnings per share attributable to Lithia Motors, Inc. (in dollars per share) | $ 10.18 | $ 6.95 | $ 27.12 | $ 12.30
Diluted earnings per share attributable to Lithia Motors, Inc. (in dollars per share) | $ 10.11 | $ 6.86 | $ 26.91 | $ 12.18
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 | $ 307.9 | $ 156.0 | $ 768.4 | $ 276.4
Reallocation of net income due to conversion of Class B to Class A common shares outstanding | 0.0 | 0.2 | 0.0 | 0.5
Conversion of Class B common shares into Class A common shares | 0.0 | 2.6 | 0.6 | 5.8
Net income attributable to Lithia Motors, Inc. and applicable to common stockholders - diluted | $ 307.9 | $ 158.8 | $ 769.0 | $ 282.7
Weighted average common shares outstanding - basic (in shares) | 30.3 | 22.5 | 28.4 | 22.5
Conversion of Class B common shares into Class A common shares (in shares) | 0.0 | 0.4 | 0.0 | 0.5
Effect of employee stock purchases and restricted stock units on weighted average common shares (in shares) | 0.2 | 0.2 | 0.2 | 0.2
Shares used in diluted per share calculations (in shares) | 30.5 | 23.1 | 28.6 | 23.2
Basic earnings per share attributable to Lithia Motors, Inc. (in dollars per share) | $ 10.18 | $ 6.95 | $ 27.12 | $ 12.29
Diluted earnings per share attributable to Lithia Motors, Inc. (in dollars per share) | $ 10.11 | $ 6.86 | $ 26.91 | $ 12.18
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 | $ 0.0 | $ 2.8 | $ 0.6 | $ 6.3
Reallocation of net income due to conversion of Class B to Class A common shares outstanding | 0.0 | 0.0 | 0.0 | 0.0
Conversion of Class B common shares into Class A common shares | 0.0 | 0.0 | 0.0 | 0.0
Net income attributable to Lithia Motors, Inc. and applicable to common stockholders - diluted | $ 0.0 | $ 2.8 | $ 0.6 | $ 6.3
Weighted average common shares outstanding - basic (in shares) | 0.0 | 0.4 | 0.0 | 0.5
Conversion of Class B common shares into Class A common shares (in shares) | 0.0 | 0.0 | 0.0 | 0.0
Effect of employee stock purchases and restricted stock units on weighted average common shares (in shares) | 0.0 | 0.0 | 0.0 | 0.0
Shares used in diluted per share calculations (in shares) | 0.0 | 0.4 | 0.0 | 0.5
Basic earnings per share attributable to Lithia Motors, Inc. (in dollars per share) | $ 0 | $ 6.95 | $ 27.12 | $ 12.29
Diluted earnings per share attributable to Lithia Motors, Inc. (in dollars per share) | $ 0 | $ 6.86 | $ 26.91 | $ 12.18

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