Fair Value - Schedule of Fair Value and Carrying Value of Company Financial Instruments (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2026	Dec. 31, 2025	Jun. 30, 2025
Assets:
Finance receivables held for sale, net	$ 545,761	$ 264,238	$ 0
Finance receivables held for investment, net	2,099,419	1,700,986	7,326,222
Estimated recovery	30,800	47,600
Fair Value
Assets:
Finance receivables held for sale, net	545,510	268,111	0
Finance receivables held for investment, net	2,085,543	1,665,453	7,423,293
Liabilities:
Deposits, net	520,458	537,136	541,418
Fair Value \| Medium-term notes
Debt:
Long-term debt, fair value	1,341,603	2,195,390	3,267,379
Fair Value \| Senior notes
Debt:
Long-term debt, fair value	237,182	241,057	687,885
Fair Value \| Asset-backed U.S. commercial paper conduit facility \| Secured debt:
Debt:
Long-term debt, fair value	0	0	461,477
Fair Value \| Asset-backed Canadian commercial paper conduit facility \| Secured debt:
Debt:
Long-term debt, fair value	0	0	60,761
Fair Value \| Asset-backed securitization debt \| Secured debt:
Debt:
Long-term debt, fair value	0	0	1,877,186
Fair Value \| Unsecured commercial paper
Debt:
Short-term debt, fair value	613,141	497,776	503,353
Carrying Value
Assets:
Finance receivables held for sale, net	545,761	264,238	0
Finance receivables held for investment, net	2,068,650	1,653,372	7,326,222
Liabilities:
Deposits, net	516,464	536,644	537,884
Carrying Value \| Medium-term notes
Debt:
Long-term debt, fair value	1,331,971	2,171,963	3,215,765
Carrying Value \| Senior notes
Debt:
Long-term debt, fair value	297,342	297,278	747,164
Carrying Value \| Asset-backed U.S. commercial paper conduit facility \| Secured debt:
Debt:
Long-term debt, fair value	0	0	461,477
Carrying Value \| Asset-backed Canadian commercial paper conduit facility \| Secured debt:
Debt:
Long-term debt, fair value	0	0	60,761
Carrying Value \| Asset-backed securitization debt \| Secured debt:
Debt:
Long-term debt, fair value	0	0	1,866,214
Carrying Value \| Unsecured commercial paper
Debt:
Short-term debt, fair value	$ 613,141	$ 497,776	$ 503,353

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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