Fair Value - Summary of Fair Value and Carrying Value of Company Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023
Fair Value
Assets:
Finance receivables, net	$ 8,041,027	$ 7,500,263	$ 7,536,523
Liabilities:
Deposits, net	516,621	460,766	459,497
Fair Value \| Medium-term notes
Debt:
Long-term debt, fair value	3,762,182	3,308,952	3,191,435
Fair Value \| Senior notes
Debt:
Long-term debt, fair value	678,553	674,787	681,581
Fair Value \| Asset-backed U.S. commercial paper conduit facility \| Secured Debt
Debt:
Long-term debt, fair value	435,930	233,258	318,406
Fair Value \| Asset-backed Canadian commercial paper conduit facility \| Secured Debt
Debt:
Long-term debt, fair value	91,379	70,742	84,269
Fair Value \| Asset-backed securitization debt \| Secured Debt
Debt:
Long-term debt, fair value	1,918,596	1,872,215	1,903,422
Fair Value \| Unsecured commercial paper
Debt:
Short-term debt, fair value	497,792	878,935	695,356
Carrying Value
Assets:
Finance receivables, net	8,018,564	7,498,265	7,509,866
Liabilities:
Deposits, net	504,093	447,782	439,911
Carrying Value \| Medium-term notes
Debt:
Long-term debt, fair value	3,776,060	3,319,138	3,297,004
Carrying Value \| Senior notes
Debt:
Long-term debt, fair value	746,438	746,079	745,722
Carrying Value \| Asset-backed U.S. commercial paper conduit facility \| Secured Debt
Debt:
Long-term debt, fair value	435,930	233,258	318,406
Carrying Value \| Asset-backed Canadian commercial paper conduit facility \| Secured Debt
Debt:
Long-term debt, fair value	91,379	70,742	84,269
Carrying Value \| Asset-backed securitization debt \| Secured Debt
Debt:
Long-term debt, fair value	1,921,408	1,877,368	1,924,545
Carrying Value \| Unsecured commercial paper
Debt:
Short-term debt, fair value	$ 497,792	$ 878,935	$ 695,356

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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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- Definition

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.

+ References

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Fair value portion of an agreement for an unconditional promise by the maker to pay the holder a definite sum of money at a future date.

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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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