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Debt (Non-Recourse Debt) (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Instrument [Line Items] |  |
Less: current maturities | $ (10.9) | $ (8.8)
Non-recourse debt, net of current maturities | 334.3 | 249.6
Restricted cash included in Other Current Assets | 18.9 | 14.3
Auto loans receivable | 566.5 | 451.2
Variable Interest Entity, Primary Beneficiary | Asset Pledged as Collateral |  |
Debt Instrument [Line Items] |  |
Restricted cash included in Other Current Assets | 4.0 | 4.3
Auto loans receivable | 43.1 | 50.8
Nonrecourse |  |
Debt Instrument [Line Items] |  |
Non Recourse Debt | 346.3 | 259.9
Less: unamortized debt discounts and debt issuance costs | (1.1) | (1.5)
Less: current maturities | (10.9) | (8.8)
Non-recourse debt, net of current maturities | 334.3 | 249.6
Warehouse Facilities | Nonrecourse |  |
Debt Instrument [Line Items] |  |
Non Recourse Debt | 303.5 | 209.4
Warehouse Facilities Maximum Borrowing Capacity | 450.0 |
Term securitization debt | Nonrecourse | Variable Interest Entity, Primary Beneficiary |  |
Debt Instrument [Line Items] |  |
Non Recourse Debt | $ 42.8 | $ 50.5
Term securitization debt | Minimum | Nonrecourse | Variable Interest Entity, Primary Beneficiary |  |
Debt Instrument [Line Items] |  |
Percentage interest on debt instrument | 1.79% |
Term securitization debt | Maximum | Nonrecourse | Variable Interest Entity, Primary Beneficiary |  |
Debt Instrument [Line Items] |  |
Percentage interest on debt instrument | 4.45% |

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