Debt - Components (Details) - USD ($)	Mar. 31, 2025	Dec. 31, 2024	Oct. 15, 2024	Aug. 16, 2024	Aug. 09, 2024	Nov. 17, 2023	Dec. 13, 2022
Line of Credit Facility [Line Items]
Maximum principal amount committed	$ 2,984,000,000	$ 2,984,000,000
Principal Amount Outstanding	1,717,000,000	1,751,300,000
Principal amount available	966,445,000	717,844,000
Carrying value	1,719,853,000	1,745,999,000
Asset Pledged as Collateral
Line of Credit Facility [Line Items]
Assets pledged as collateral	3,298,961,000	3,080,569,000
Senior Notes
Line of Credit Facility [Line Items]
Maximum principal amount committed, other borrowings	615,000,000	615,000,000
ASPV Credit Facility | Line of credit
Line of Credit Facility [Line Items]
Maximum principal amount committed, credit facilities	500,000,000	500,000,000			$ 500,000,000		$ 300,000,000
Principal Amount Outstanding	297,000,000	251,300,000
Principal amount available	33,163,000	69,062,000
Carrying value, credit facilities	297,000,000	251,300,000
ASPV Credit Facility | Line of credit | Asset Pledged as Collateral
Line of Credit Facility [Line Items]
Assets pledged as collateral	504,929,000	493,142,000
MSPV Credit Facility | Line of credit
Line of Credit Facility [Line Items]
Maximum principal amount committed, credit facilities	500,000,000	500,000,000
Principal Amount Outstanding	375,000,000	191,400,000
Principal amount available	125,000,000	101,922,000
Carrying value, credit facilities	375,000,000	191,400,000
MSPV Credit Facility | Line of credit | Asset Pledged as Collateral
Line of Credit Facility [Line Items]
Assets pledged as collateral	801,691,000	505,122,000
Truist Credit Facility | Line of credit
Line of Credit Facility [Line Items]
Maximum principal amount committed, credit facilities	975,000,000	975,000,000		$ 975,000,000		$ 300,000,000
Principal Amount Outstanding	36,000,000	299,600,000
Principal amount available	808,282,000	546,860,000
Carrying value, credit facilities	36,000,000	299,600,000
Truist Credit Facility | Line of credit | Asset Pledged as Collateral
Line of Credit Facility [Line Items]
Assets pledged as collateral	1,547,426,000	1,639,675,000
Series A Tranche A Notes | Senior Notes
Line of Credit Facility [Line Items]
Maximum principal amount committed, other borrowings	90,000,000	90,000,000
Principal Amount Outstanding	90,000,000	90,000,000
Carrying value, other borrowings	90,216,000	89,732,000
Series A Tranche A Notes | Senior Notes | Asset Pledged as Collateral
Line of Credit Facility [Line Items]
Assets pledged as collateral	0	0
Series A Tranche B Notes | Senior Notes
Line of Credit Facility [Line Items]
Maximum principal amount committed, other borrowings	150,000,000	150,000,000
Principal Amount Outstanding	150,000,000	150,000,000
Carrying value, other borrowings	150,788,000	148,799,000
Series A Tranche B Notes | Senior Notes | Asset Pledged as Collateral
Line of Credit Facility [Line Items]
Assets pledged as collateral	0	0
Series B Tranche A Notes | Senior Notes
Line of Credit Facility [Line Items]
Maximum principal amount committed, other borrowings	85,000,000	85,000,000	$ 85,000,000
Principal Amount Outstanding	85,000,000	85,000,000
Carrying value, other borrowings	85,438,000	84,330,000
Series B Tranche A Notes | Senior Notes | Asset Pledged as Collateral
Line of Credit Facility [Line Items]
Assets pledged as collateral	0	0
Series B Tranche B Notes | Senior Notes
Line of Credit Facility [Line Items]
Maximum principal amount committed, other borrowings	25,000,000	25,000,000	25,000,000
Principal Amount Outstanding	25,000,000	25,000,000
Carrying value, other borrowings	25,000,000	25,000,000
Series B Tranche B Notes | Senior Notes | Asset Pledged as Collateral
Line of Credit Facility [Line Items]
Assets pledged as collateral	0	0
Series B Tranche C Notes | Senior Notes
Line of Credit Facility [Line Items]
Maximum principal amount committed, other borrowings	290,000,000	290,000,000	$ 290,000,000
Principal Amount Outstanding	290,000,000	290,000,000
Carrying value, other borrowings	291,411,000	286,838,000
Series B Tranche C Notes | Senior Notes | Asset Pledged as Collateral
Line of Credit Facility [Line Items]
Assets pledged as collateral	0	0
CLO Transaction | Secured Debt
Line of Credit Facility [Line Items]
Maximum principal amount committed, other borrowings	369,000,000	369,000,000
Principal Amount Outstanding	369,000,000	369,000,000
Principal amount available	0	0
Carrying value, other borrowings	369,000,000	369,000,000
CLO Transaction | Secured Debt | Asset Pledged as Collateral
Line of Credit Facility [Line Items]
Assets pledged as collateral	$ 444,915,000	$ 442,629,000