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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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Stock Repurchase Program, Increase (Decrease) In Authorized Amount

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