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DEBT - Schedule of Non-Recourse Notes Payable (Details) - Non-recourse notes payable - Non-recourse $ in Millions	Sep. 30, 2024 USD ($)
Debt Instrument [Line Items]
Long-term debt, gross	$ 1,783.0
Initial Principal Amount	3,254.5
LAD Auto Receivables Trust 2021-1 Class A-D
Debt Instrument [Line Items]
Long-term debt, gross	56.5
Initial Principal Amount	$ 344.4
LAD Auto Receivables Trust 2021-1 Class A-D | Minimum
Debt Instrument [Line Items]
Interest Rate Range	1.94%
LAD Auto Receivables Trust 2021-1 Class A-D | Maximum
Debt Instrument [Line Items]
Interest Rate Range	3.99%
LAD Auto Receivables Trust 2022-1 Class A-C
Debt Instrument [Line Items]
Long-term debt, gross	$ 96.4
Initial Principal Amount	$ 298.1
LAD Auto Receivables Trust 2022-1 Class A-C | Minimum
Debt Instrument [Line Items]
Interest Rate Range	5.21%
LAD Auto Receivables Trust 2022-1 Class A-C | Maximum
Debt Instrument [Line Items]
Interest Rate Range	6.85%
LAD Auto Receivables Trust 2023-1 Class A-D
Debt Instrument [Line Items]
Long-term debt, gross	$ 208.9
Initial Principal Amount	$ 479.7
LAD Auto Receivables Trust 2023-1 Class A-D | Minimum
Debt Instrument [Line Items]
Interest Rate Range	5.48%
LAD Auto Receivables Trust 2023-1 Class A-D | Maximum
Debt Instrument [Line Items]
Interest Rate Range	7.30%
LAD Auto Receivables Trust 2023-2 Class A-D
Debt Instrument [Line Items]
Long-term debt, gross	$ 283.3
Initial Principal Amount	$ 556.7
LAD Auto Receivables Trust 2023-2 Class A-D | Minimum
Debt Instrument [Line Items]
Interest Rate Range	5.42%
LAD Auto Receivables Trust 2023-2 Class A-D | Maximum
Debt Instrument [Line Items]
Interest Rate Range	6.30%
LAD Auto Receivables Trust 2023-3 Class A-D
Debt Instrument [Line Items]
Long-term debt, gross	$ 251.8
Initial Principal Amount	$ 415.4
LAD Auto Receivables Trust 2023-3 Class A-D | Minimum
Debt Instrument [Line Items]
Interest Rate Range	5.95%
LAD Auto Receivables Trust 2023-3 Class A-D | Maximum
Debt Instrument [Line Items]
Interest Rate Range	6.92%
LAD Auto Receivables Trust 2023-4 Class A-D
Debt Instrument [Line Items]
Long-term debt, gross	$ 281.4
Initial Principal Amount	$ 421.2
LAD Auto Receivables Trust 2023-4 Class A-D | Minimum
Debt Instrument [Line Items]
Interest Rate Range	6.10%
LAD Auto Receivables Trust 2023-4 Class A-D | Maximum
Debt Instrument [Line Items]
Interest Rate Range	7.37%
LAD Auto Receivables Trust 2024-1 Class A-D
Debt Instrument [Line Items]
Long-term debt, gross	$ 248.4
Initial Principal Amount	$ 329.4
LAD Auto Receivables Trust 2024-1 Class A-D | Minimum
Debt Instrument [Line Items]
Interest Rate Range	5.17%
LAD Auto Receivables Trust 2024-1 Class A-D | Maximum
Debt Instrument [Line Items]
Interest Rate Range	6.15%
LAD Auto Receivables Trust 2024-2 Class A-D
Debt Instrument [Line Items]
Long-term debt, gross	$ 356.3
Initial Principal Amount	$ 409.6
LAD Auto Receivables Trust 2024-2 Class A-D | Minimum
Debt Instrument [Line Items]
Interest Rate Range	5.46%
LAD Auto Receivables Trust 2024-2 Class A-D | Maximum
Debt Instrument [Line Items]
Interest Rate Range	6.37%

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