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DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2024 USD ($) state dealership franchise vehicleBrand collisionCenter shares | Sep. 30, 2023 shares | Sep. 30, 2024 USD ($) state segment dealership franchise vehicleBrand collisionCenter shares | Sep. 30, 2023 USD ($) shares | May 15, 2024 USD ($) | May 14, 2024 USD ($)
Business Organization [Line Items] |  |  |  |  |  |
Number of franchises (in franchises) | franchise | 202 |  | 202 |  |  |
Number of dealership locations (in dealership locations) | dealership | 153 |  | 153 |  |  |
Number of vehicle brands (in vehicle brands) | vehicleBrand | 31 |  | 31 |  |  |
Number of collision repair centers (in collision repair centers) | collisionCenter | 37 |  | 37 |  |  |
Number of states (in states) | state | 14 |  | 14 |  |  |
Number of reportable segments | segment |  |  | 2 |  |  |
Shares repurchased (in shares) | shares | 393,951 | 0 | 826,340 | 1,070,126 |  |
Treasury stock, retired (in shares) | shares | 393,951 | 0 | 826,340 | 1,124,330 |  |
Cash paid to acquire treasury stock | $ |  |  | $ 182.1 | $ 210.7 |  |
Stock repurchase program, increase (decrease) in authorized amount | $ |  |  |  |  |  | $ 256.2
Stock repurchase program, authorized amount | $ |  |  |  |  | $ 400.0 |
Stock repurchase program, remaining authorized repurchase amount | $ | $ 276.7 |  | $ 276.7 |  |  |
Restricted Share Units |  |  |  |  |  |
Business Organization [Line Items] |  |  |  |  |  |
Antidilutive securities excluded from computation of earnings per share (in shares) | shares | 201 | 466 | 1,784 | 2,235 |  |
Performance share units |  |  |  |  |  |
Business Organization [Line Items] |  |  |  |  |  |
Antidilutive securities excluded from computation of earnings per share (in shares) | shares | 0 | 3 | 1,177 | 0 |  |
Luxury Brands |  |  |  |  |  |
Business Organization [Line Items] |  |  |  |  |  |
Weighted brand mix (percent) |  |  | 29.00% |  |  |
Mid-line Import Brands |  |  |  |  |  |
Business Organization [Line Items] |  |  |  |  |  |
Weighted brand mix (percent) |  |  | 41.00% |  |  |
Domestic Brands |  |  |  |  |  |
Business Organization [Line Items] |  |  |  |  |  |
Weighted brand mix (percent) |  |  | 29.00% |  |  |

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