Debt - Components (Details) - USD ($)	Jun. 30, 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	$ 3,084,000,000	$ 2,984,000,000
Principal Amount Outstanding	1,797,500,000	1,751,300,000
Principal Amount Available	887,813,000	717,844,000
Carrying value	1,804,922,000	1,745,999,000
Asset Pledged as Collateral
Line of Credit Facility [Line Items]
Assets Pledged as Collateral	3,512,536,000	3,080,569,000
Senior Notes
Line of Credit Facility [Line Items]
Principal Amount Outstanding	715,000,000	615,000,000
ASPV Credit Facility | Line of Credit
Line of Credit Facility [Line Items]
Maximum Principal Amount Committed	500,000,000	500,000,000			$ 500,000,000		$ 300,000,000
Principal Amount Outstanding	277,300,000	251,300,000
Principal Amount Available	46,102,000	69,062,000
Carrying Value	277,300,000	251,300,000
ASPV Credit Facility | Line of Credit | Asset Pledged as Collateral
Line of Credit Facility [Line Items]
Assets Pledged as Collateral	503,212,000	493,142,000
MSPV Credit Facility | Line of Credit
Line of Credit Facility [Line Items]
Maximum Principal Amount Committed	500,000,000	500,000,000
Principal Amount Outstanding	360,000,000	191,400,000
Principal Amount Available	100,546,000	101,922,000
Carrying Value	360,000,000	191,400,000
MSPV Credit Facility | Line of Credit | Asset Pledged as Collateral
Line of Credit Facility [Line Items]
Assets Pledged as Collateral	737,701,000	505,122,000
Truist Credit Facility | Line of Credit
Line of Credit Facility [Line Items]
Maximum Principal Amount Committed	975,000,000	975,000,000		$ 975,000,000		$ 300,000,000
Principal Amount Outstanding	51,200,000	299,600,000
Principal Amount Available	741,165,000	546,860,000
Carrying Value	51,200,000	299,600,000
Truist Credit Facility | Line of Credit | Asset Pledged as Collateral
Line of Credit Facility [Line Items]
Assets Pledged as Collateral	1,830,778,000	1,639,675,000
Series A Tranche A Notes | Senior Notes
Line of Credit Facility [Line Items]
Maximum Principal Amount Committed	90,000,000	90,000,000
Principal Amount Outstanding	90,000,000	90,000,000
Carrying Value	90,349,000	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	150,000,000	150,000,000
Principal Amount Outstanding	150,000,000	150,000,000
Carrying Value	151,861,000	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	85,000,000	85,000,000	$ 85,000,000
Principal Amount Outstanding	85,000,000	85,000,000
Carrying Value	86,025,000	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	25,000,000	25,000,000	25,000,000
Principal Amount Outstanding	25,000,000	25,000,000
Carrying Value	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	290,000,000	290,000,000	$ 290,000,000
Principal Amount Outstanding	290,000,000	290,000,000
Carrying Value	293,962,000	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
Series C Tranche A Notes | Senior Notes
Line of Credit Facility [Line Items]
Maximum Principal Amount Committed	25,000,000
Principal Amount Outstanding	25,000,000
Carrying Value	25,176,000
Series C Tranche A Notes | Senior Notes | Asset Pledged as Collateral
Line of Credit Facility [Line Items]
Assets Pledged as Collateral	0
Series C Tranche B Notes | Senior Notes
Line of Credit Facility [Line Items]
Maximum Principal Amount Committed	75,000,000
Principal Amount Outstanding	75,000,000
Carrying Value	75,049,000
Series C Tranche B Notes | Senior Notes | Asset Pledged as Collateral
Line of Credit Facility [Line Items]
Assets Pledged as Collateral	0
CLO Transaction | Secured Debt
Line of Credit Facility [Line Items]
Maximum Principal Amount Committed	369,000,000	369,000,000
Principal Amount Outstanding	369,000,000	369,000,000
Principal Amount Available		0
Carrying Value	369,000,000	369,000,000
CLO Transaction | Secured Debt | Asset Pledged as Collateral
Line of Credit Facility [Line Items]
Assets Pledged as Collateral	$ 440,845,000	$ 442,629,000