Fair Value - Schedule of Fair Value and Carrying Value of Company Financial Instruments (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
Assets:
Finance receivables held for sale, net	$ 264,238	$ 0
Finance receivables held for investment, net	1,700,986	7,288,294
Debt:
Estimated recovery	47,600
Fair Value
Assets:
Finance receivables held for sale, net	268,111	0
Finance receivables held for investment, net	1,665,453	7,342,319
Liabilities:
Deposits, net	537,136	555,902
Fair Value \| Medium-term notes
Debt:
Long-term debt, fair value	2,195,390	3,127,710
Fair Value \| Senior notes
Debt:
Long-term debt, fair value	241,057	683,624
Fair Value \| Asset-backed U.S. commercial paper conduit facility \| Secured Debt
Debt:
Long-term debt, fair value	0	431,846
Fair Value \| Asset-backed Canadian commercial paper conduit facility \| Secured Debt
Debt:
Long-term debt, fair value	0	77,381
Fair Value \| Asset-backed securitization debt \| Secured Debt
Debt:
Long-term debt, fair value	0	1,955,006
Fair Value \| Unsecured commercial paper
Debt:
Short-term debt, fair value	497,776	640,204
Carrying Value
Assets:
Finance receivables held for sale, net	264,238	0
Finance receivables held for investment, net	1,653,372	7,288,294
Liabilities:
Deposits, net	536,644	550,586
Carrying Value \| Medium-term notes
Debt:
Long-term debt, fair value	2,171,963	3,114,013
Carrying Value \| Senior notes
Debt:
Long-term debt, fair value	297,278	746,800
Carrying Value \| Asset-backed U.S. commercial paper conduit facility \| Secured Debt
Debt:
Long-term debt, fair value	0	431,846
Carrying Value \| Asset-backed Canadian commercial paper conduit facility \| Secured Debt
Debt:
Long-term debt, fair value	0	77,381
Carrying Value \| Asset-backed securitization debt \| Secured Debt
Debt:
Long-term debt, fair value	0	1,950,138
Carrying Value \| Unsecured commercial paper
Debt:
Short-term debt, fair value	$ 497,776	$ 640,204

Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Estimated Recovery

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Financing Receivable, Excluding Accrued Interest, Held-For-Sale, Net, Current

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

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Amortized cost excluding accrued interest, after allowance for credit loss, of financing receivable. Excludes net investment in lease.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount of short-term debt existing as of the balance sheet date.

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