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Fair Value Measurements - Schedule of Senior Asset-Backed Securities at Fair Value Activity (Details) - Senior asset-backed securities related to Structured Program transactions - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at beginning of period	$ 3,246,380	$ 2,869,281	$ 3,092,410	$ 2,899,824
Additions	686,670	495,771	1,313,260	819,887
Cash received	(527,341)	(398,286)	(988,488)	(749,951)
Change in unrealized loss	(11,655)	(4,291)	(23,128)	(7,285)
Fair value at end of period	$ 3,394,054	$ 2,962,475	$ 3,394,054	$ 2,962,475

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

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- Definition

Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3).

+ References

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- Definition

Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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