Fair Value - Schedule of Fair Value and Carrying Value of Company Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Fair Value
Assets:
Finance receivables, net	$ 7,865,082	$ 7,500,263	$ 7,668,607
Liabilities:
Deposits, net	551,806	460,766	498,834
Fair Value \| Medium-term notes
Debt:
Long-term debt, fair value	3,882,407	3,308,952	3,156,412
Fair Value \| Senior notes
Debt:
Long-term debt, fair value	703,108	674,787	642,746
Fair Value \| Asset-backed U.S. commercial paper conduit facility \| Secured Debt
Debt:
Long-term debt, fair value	378,968	233,258	272,766
Fair Value \| Asset-backed Canadian commercial paper conduit facility \| Secured Debt
Debt:
Long-term debt, fair value	94,142	70,742	79,755
Fair Value \| Asset-backed securitization debt \| Secured Debt
Debt:
Long-term debt, fair value	2,258,289	1,872,215	2,121,724
Fair Value \| Unsecured commercial paper
Debt:
Short-term debt, fair value	497,373	878,935	815,081
Carrying Value
Assets:
Finance receivables, net	7,800,387	7,498,265	7,655,224
Liabilities:
Deposits, net	549,010	447,782	478,933
Carrying Value \| Medium-term notes
Debt:
Long-term debt, fair value	3,836,572	3,319,138	3,257,396
Carrying Value \| Senior notes
Debt:
Long-term debt, fair value	746,618	746,079	745,900
Carrying Value \| Asset-backed U.S. commercial paper conduit facility \| Secured Debt
Debt:
Long-term debt, fair value	378,968	233,258	272,766
Carrying Value \| Asset-backed Canadian commercial paper conduit facility \| Secured Debt
Debt:
Long-term debt, fair value	94,142	70,742	79,755
Carrying Value \| Asset-backed securitization debt \| Secured Debt
Debt:
Long-term debt, fair value	2,244,742	1,877,368	2,138,684
Carrying Value \| Unsecured commercial paper
Debt:
Short-term debt, fair value	$ 497,373	$ 878,935	$ 815,081

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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.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

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.

+ References

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