Asset-Backed Financing -Schedule of Assets and Liabilities of Variable Interest Entities (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024	Sep. 30, 2024
Finance receivables
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings
Transfers accounts for as secured borrowings, assets, carrying amount	$ 843,506	$ 3,051,035	$ 3,290,187
Transfers accounted for as secured borrowings, assets, allowance for credit losses, carrying amount	0	(172,737)	(180,443)
Restricted cash
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings
Transfers accounts for as secured borrowings, assets, carrying amount	51,530	151,246	163,037
Other assets
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings
Transfers accounts for as secured borrowings, assets, carrying amount	3,551	7,598	6,208
Total assets
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings
Transfers accounts for as secured borrowings, assets, carrying amount	898,587	3,037,142	3,278,989
Asset-backed debt, net
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings
Transfers accounts for as secured borrowings, associated liabilities, carrying amount	511,779	2,459,365	2,717,852
Consolidated VIEs | Finance receivables | Asset-backed securitizations
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings
Transfers accounts for as secured borrowings, assets, carrying amount	334,759	2,470,147	2,772,473
Transfers accounted for as secured borrowings, assets, allowance for credit losses, carrying amount	0	(140,632)	(152,943)
Consolidated VIEs | Finance receivables | Asset-backed U.S. commercial paper conduit facility
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings
Transfers accounts for as secured borrowings, assets, carrying amount	450,702	490,766	408,515
Transfers accounted for as secured borrowings, assets, allowance for credit losses, carrying amount	0	(27,890)	(22,501)
Consolidated VIEs | Restricted cash | Asset-backed securitizations
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings
Transfers accounts for as secured borrowings, assets, carrying amount	18,655	118,310	131,459
Consolidated VIEs | Restricted cash | Asset-backed U.S. commercial paper conduit facility
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings
Transfers accounts for as secured borrowings, assets, carrying amount	29,084	28,201	25,124
Consolidated VIEs | Other assets | Asset-backed securitizations
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings
Transfers accounts for as secured borrowings, assets, carrying amount	1,491	5,260	4,523
Consolidated VIEs | Other assets | Asset-backed U.S. commercial paper conduit facility
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings
Transfers accounts for as secured borrowings, assets, carrying amount	1,917	2,104	1,522
Consolidated VIEs | Total assets | Asset-backed securitizations
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings
Transfers accounts for as secured borrowings, assets, carrying amount	354,905	2,453,085	2,755,512
Consolidated VIEs | Total assets | Asset-backed U.S. commercial paper conduit facility
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings
Transfers accounts for as secured borrowings, assets, carrying amount	481,703	493,181	412,660
Consolidated VIEs | Asset-backed debt, net | Asset-backed securitizations
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings
Transfers accounts for as secured borrowings, associated liabilities, carrying amount	62,635	1,950,138	2,244,742
Consolidated VIEs | Asset-backed debt, net | Asset-backed U.S. commercial paper conduit facility
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings
Transfers accounts for as secured borrowings, associated liabilities, carrying amount	399,502	431,846	378,968
Unconsolidated VIEs | Finance receivables | Asset-backed Canadian commercial paper conduit facility
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings
Transfers accounts for as secured borrowings, assets, carrying amount	58,045	90,122	109,199
Transfers accounted for as secured borrowings, assets, allowance for credit losses, carrying amount	0	(4,215)	(4,999)
Unconsolidated VIEs | Restricted cash | Asset-backed Canadian commercial paper conduit facility
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings
Transfers accounts for as secured borrowings, assets, carrying amount	3,791	4,735	6,454
Unconsolidated VIEs | Other assets | Asset-backed Canadian commercial paper conduit facility
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings
Transfers accounts for as secured borrowings, assets, carrying amount	143	234	163
Unconsolidated VIEs | Total assets | Asset-backed Canadian commercial paper conduit facility
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings
Transfers accounts for as secured borrowings, assets, carrying amount	61,979	90,876	110,817
Unconsolidated VIEs | Asset-backed debt, net | Asset-backed Canadian commercial paper conduit facility
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings
Transfers accounts for as secured borrowings, associated liabilities, carrying amount	$ 49,642	$ 77,381	$ 94,142