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Auto Loans Receivable - Financing Receivable, Allowance for Credit Loss (Details) - USD ($) $ in Millions |  | 12 Months Ended
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Oct. 01, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |
Balance as of beginning of year |  |  | $ 57.5 | $ 0.0 |  |
Provision for credit losses |  |  | 45.9 | 43.8 | [1] | $ 0.0
Initial allowance for purchased credit-deteriorated loans |  |  | 0.0 | 21.7 |  |
Write-offs |  |  | (68.3) | (13.9) |  |
Recoveries | [2] |  | 27.3 | 5.9 |  |
Sold loans |  |  | (16.1) | 0.0 |  |
Balance as of end of year |  |  | 46.3 | 57.5 |  | 0.0
Sold auto loans receivable, aggregate amortized cost |  |  | 60.6 |  |  |
Proceeds from the sale of auto loans receivable |  |  | 68.7 | 0.0 |  | 0.0
Gain on sale of auto loans receivable |  |  | $ 8.1 | $ 0.0 |  | $ 0.0
CIG Financial Acquisition |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |
Provision for credit losses |  | $ 34.2 |  |  |  |
[1] | (1) Reflects activity that occurred after the acquisition of CIG Financial on October 1, 2022. Provision for credit losses includes initial credit loss expense of $34.2 million associated with the auto loan portfolio acquired as part of the acquisition.
[2] | (2) Includes proceeds from the recovery of vehicle collateral, net of costs incurred.

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