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ACCOUNTS RECEIVABLE - Schedule of Accounts Receivable (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, before allowance for credit loss	$ 1,404.8	$ 1,239.3
Less: Allowance for doubtful accounts	(5.6)	(2.3)
Total accounts receivable, net	1,399.2	1,237.0
Contracts in transit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, before allowance for credit loss	593.0	497.4
Trade receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, before allowance for credit loss	159.8	166.5
Vehicle receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, before allowance for credit loss	306.2	243.7
Manufacturer receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, before allowance for credit loss	326.7	306.3
Other receivables, current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, before allowance for credit loss	$ 19.1	$ 25.4

X

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