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Auto Loans Receivable - Financing Receivable, Past Due (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Financing Receivable, Past Due [Line Items] |  |
Total auto loans receivable | $ 2,020.0 | $ 1,103.8
Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total auto loans receivable | 48.5 | 28.8
31-60 Days |  |
Financing Receivable, Past Due [Line Items] |  |
Total auto loans receivable | 35.1 | 20.6
61-90 Days |  |
Financing Receivable, Past Due [Line Items] |  |
Total auto loans receivable | 9.8 | 5.5
Greater than 90 Days |  |
Financing Receivable, Past Due [Line Items] |  |
Total auto loans receivable | 3.6 | 2.7
Current |  |
Financing Receivable, Past Due [Line Items] |  |
Total auto loans receivable | $ 1,971.5 | $ 1,075.0

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