ACCOUNTS RECEIVABLE (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	$ 179.8	$ 231.4
Less—Allowance for doubtful accounts	(1.9)	(1.6)
Accounts receivable, net	177.9	229.8
Vehicle receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	44.5	73.1
Manufacturer receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	41.8	44.0
Other receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	$ 93.5	$ 114.3