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ACCOUNTS RECEIVABLE AND OTHER NON-CURRENT ASSETS - Summary of Accounts Receivable (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Auto loan and lease receivables	$ 2,570.6	$ 1,529.9
Less: Allowance for doubtful accounts	(37.0)	(17.3)
Less: Long-term portion of accounts receivable, net	(1,529.0)	(602.6)
Accounts receivable, net	1,004.6	910.0
Contracts in transit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Auto loan and lease receivables	356.9	304.9
Trade receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Auto loan and lease receivables	115.2	125.5
Vehicle receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Auto loan and lease receivables	114.0	106.6
Manufacturer receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Auto loan and lease receivables	145.8	120.5
Auto loan and lease receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Auto loan and lease receivables	1,821.5	829.2
Less: Allowance for doubtful accounts	(52.4)	(25.0)
Less: Long-term portion of accounts receivable, net	(1,501.4)	(579.7)
Accounts receivable, net	267.7	224.5
Other receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Auto loan and lease receivables	$ 17.2	$ 43.2

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