ACCOUNTS RECEIVABLE (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	$ 228.6	$ 174.1
Less—Allowance for credit losses	(2.6)	(2.2)
Accounts receivable, net	226.1	171.9
Vehicle receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	72.5	50.4
Manufacturer receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	68.0	43.3
Other receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	$ 88.1	$ 80.5