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DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 USD ($) franchise state dealership vehicleBrand collisionCenter shares | Sep. 30, 2024 shares | Sep. 30, 2025 USD ($) franchise state dealership vehicleBrand segment collisionCenter shares | Sep. 30, 2024 USD ($) shares | May 14, 2024 USD ($)
Business Organization [Line Items] |  |  |  |  |
Number of franchises (in franchises) | franchise | 230 |  | 230 |  |
Number of dealership locations (in dealership locations) | dealership | 175 |  | 175 |  |
Number of vehicle brands (in vehicle brands) | vehicleBrand | 36 |  | 36 |  |
Number of collision repair centers (in collision repair centers) | collisionCenter | 39 |  | 39 |  |
Number of states (in states) | state | 15 |  | 15 |  |
Number of reportable segments | segment |  |  | 2 |  |
Repurchase and retirement of common stock (in shares) | shares | 220,587 |  | 220,587 | 826,340 |
Stock repurchase program, increase (decrease) in authorized amount |  |  |  |  | $ 256.2
Stock repurchase program, authorized amount |  |  |  |  | $ 400.0
Stock repurchase program, remaining authorized repurchase amount | $ 225.9 |  | $ 225.9 |  |
Payments for repurchase of common stock |  |  | $ 50.0 | $ 182.1 |
Restricted Share Units |  |  |  |  |
Business Organization [Line Items] |  |  |  |  |
Antidilutive securities excluded from computation of earnings per share (in shares) | shares | 548 | 6,323 | 201 | 1,784 |
Performance share units |  |  |  |  |
Business Organization [Line Items] |  |  |  |  |
Antidilutive securities excluded from computation of earnings per share (in shares) | shares | 0 | 25 |  | 1,177 |
Luxury Brands |  |  |  |  |
Business Organization [Line Items] |  |  |  |  |
Weighted brand mix (percent) |  |  | 31.00% |  |
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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