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ACCOUNTS RECEIVABLE - Schedule of Accounts Receivable (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable, before allowance for credit loss | $ 1,241.3 | $ 1,239.3
Less: Allowance for doubtful accounts | (6.0) | (2.3)
Total accounts receivable, net | 1,235.3 | 1,237.0
Contracts in transit |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable, before allowance for credit loss | 481.7 | 497.4
Trade receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable, before allowance for credit loss | 158.1 | 166.5
Vehicle receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable, before allowance for credit loss | 269.1 | 243.7
Manufacturer receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable, before allowance for credit loss | 299.1 | 306.3
Other receivables, current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable, before allowance for credit loss | $ 33.3 | $ 25.4

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