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DEBT - Schedule of Non-Recourse Notes Payable (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Debt Instrument [Line Items] |  |
Proceeds from issuance of non-recourse notes payable | $ 329.4 | $ 479.7
Non-recourse | Asset Backed Funding Vehicles |  |
Debt Instrument [Line Items] |  |
Proceeds from issuance of non-recourse notes payable | 329.4 |
Non-recourse notes payable | Non-recourse |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | 1,831.5 |
Aggregate principal amount | 2,844.9 |
Non-recourse notes payable | LAD Auto Receivables Trust 2021-1 Class A-D | Non-recourse |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | 82.6 |
Aggregate principal amount | $ 344.4 |
Non-recourse notes payable | LAD Auto Receivables Trust 2021-1 Class A-D | Non-recourse | Minimum |  |
Debt Instrument [Line Items] |  |
Debt stated interest rate (as a percent) | 1.30% |
Non-recourse notes payable | LAD Auto Receivables Trust 2021-1 Class A-D | Non-recourse | Maximum |  |
Debt Instrument [Line Items] |  |
Debt stated interest rate (as a percent) | 3.99% |
Non-recourse notes payable | LAD Auto Receivables Trust 2022-1 Class A-C | Non-recourse |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 131.6 |
Aggregate principal amount | $ 298.1 |
Non-recourse notes payable | LAD Auto Receivables Trust 2022-1 Class A-C | Non-recourse | Minimum |  |
Debt Instrument [Line Items] |  |
Debt stated interest rate (as a percent) | 5.21% |
Non-recourse notes payable | LAD Auto Receivables Trust 2022-1 Class A-C | Non-recourse | Maximum |  |
Debt Instrument [Line Items] |  |
Debt stated interest rate (as a percent) | 6.85% |
Non-recourse notes payable | LAD Auto Receivables Trust 2023-1 Class A-D | Non-recourse |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 279.0 |
Aggregate principal amount | $ 479.7 |
Non-recourse notes payable | LAD Auto Receivables Trust 2023-1 Class A-D | Non-recourse | Minimum |  |
Debt Instrument [Line Items] |  |
Debt stated interest rate (as a percent) | 5.48% |
Non-recourse notes payable | LAD Auto Receivables Trust 2023-1 Class A-D | Non-recourse | Maximum |  |
Debt Instrument [Line Items] |  |
Debt stated interest rate (as a percent) | 7.30% |
Non-recourse notes payable | LAD Auto Receivables Trust 2023-2 Class A-D | Non-recourse |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 362.5 |
Aggregate principal amount | $ 556.7 |
Non-recourse notes payable | LAD Auto Receivables Trust 2023-2 Class A-D | Non-recourse | Minimum |  |
Debt Instrument [Line Items] |  |
Debt stated interest rate (as a percent) | 5.42% |
Non-recourse notes payable | LAD Auto Receivables Trust 2023-2 Class A-D | Non-recourse | Maximum |  |
Debt Instrument [Line Items] |  |
Debt stated interest rate (as a percent) | 6.30% |
Non-recourse notes payable | LAD Auto Receivables Trust 2023-3 Class A-D | Non-recourse |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 316.9 |
Aggregate principal amount | $ 415.4 |
Non-recourse notes payable | LAD Auto Receivables Trust 2023-3 Class A-D | Non-recourse | Minimum |  |
Debt Instrument [Line Items] |  |
Debt stated interest rate (as a percent) | 5.95% |
Non-recourse notes payable | LAD Auto Receivables Trust 2023-3 Class A-D | Non-recourse | Maximum |  |
Debt Instrument [Line Items] |  |
Debt stated interest rate (as a percent) | 6.92% |
Non-recourse notes payable | LAD Auto Receivables Trust 2023-4 Class A-D | Non-recourse |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 352.4 |
Aggregate principal amount | $ 421.2 |
Non-recourse notes payable | LAD Auto Receivables Trust 2023-4 Class A-D | Non-recourse | Minimum |  |
Debt Instrument [Line Items] |  |
Debt stated interest rate (as a percent) | 6.10% |
Non-recourse notes payable | LAD Auto Receivables Trust 2023-4 Class A-D | Non-recourse | Maximum |  |
Debt Instrument [Line Items] |  |
Debt stated interest rate (as a percent) | 7.37% |
Non-recourse notes payable | LAD Auto Receivables Trust 2024-1 Class A-D | Non-recourse |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 306.5 |
Aggregate principal amount | $ 329.4 |
Non-recourse notes payable | LAD Auto Receivables Trust 2024-1 Class A-D | Non-recourse | Minimum |  |
Debt Instrument [Line Items] |  |
Debt stated interest rate (as a percent) | 5.17% |
Non-recourse notes payable | LAD Auto Receivables Trust 2024-1 Class A-D | Non-recourse | Maximum |  |
Debt Instrument [Line Items] |  |
Debt stated interest rate (as a percent) | 6.15% |

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