Debt - Narrative (Details) - USD ($)								9 Months Ended
	Dec. 12, 2024	Nov. 14, 2024	Oct. 15, 2024	Aug. 09, 2024	May 28, 2024	May 27, 2024	Dec. 13, 2022	Sep. 30, 2025	Sep. 30, 2024	Jun. 30, 2025	Dec. 31, 2024	Aug. 16, 2024	May 30, 2024	Mar. 19, 2024	Nov. 17, 2023
Line of Credit Facility [Line Items]
Asset coverage ratio								212.10%			188.30%
Borrowings outstanding								$ 1,892,500,000			$ 1,751,300,000
Borrowings on debt								1,073,100,000	$ 1,725,048,000
Total CLO Transaction								$ 445,000,000					$ 445,000,000
Short-Term Financing Transactions
Line of Credit Facility [Line Items]
Debt term								180 days
Short-term debt								$ 0			0
Line of Credit | MSPV Credit Facility
Line of Credit Facility [Line Items]
Maximum commitment								500,000,000			500,000,000
Borrowings outstanding								363,100,000			191,400,000
Line of Credit | MSPV Credit Facility | Interest rate scenario one
Line of Credit Facility [Line Items]
Spread on variable rate					2.20%	2.50%
Line of Credit | MSPV Credit Facility | Interest rate scenario two
Line of Credit Facility [Line Items]
Spread on variable rate					2.70%	3.00%
Line of Credit | ASPV Credit Facility
Line of Credit Facility [Line Items]
Maximum commitment				$ 500,000,000			$ 300,000,000	$ 500,000,000			500,000,000
Spread on variable rate				2.40%			2.875%	2.875%
Borrowings outstanding								$ 274,200,000			251,300,000
Line of Credit | Truist Credit Facility
Line of Credit Facility [Line Items]
Maximum commitment								975,000,000			975,000,000	$ 975,000,000			$ 300,000,000
Additional borrowing capacity												$ 1,462,500,000
Borrowings outstanding								$ 146,200,000			299,600,000
Line of Credit | Truist Credit Facility | Secured Overnight Financing Rate (SOFR)
Line of Credit Facility [Line Items]
Spread on variable rate								2.00%
Line of Credit | Truist Credit Facility | Alternate base rate
Line of Credit Facility [Line Items]
Spread on variable rate								1.00%
Senior Notes
Line of Credit Facility [Line Items]
Borrowings outstanding								$ 715,000,000			615,000,000
Senior Notes | Series A Tranche A Notes
Line of Credit Facility [Line Items]
Aggregate principal amount														$ 90,000,000
Interest rate														7.69%
Senior Notes | Series A Tranche B Notes
Line of Credit Facility [Line Items]
Aggregate principal amount														$ 150,000,000
Interest rate														7.78%
Senior Notes | Series B Senior Notes
Line of Credit Facility [Line Items]
Aggregate principal amount			$ 400,000,000
Senior Notes | Series B Tranche A Notes
Line of Credit Facility [Line Items]
Borrowings outstanding								85,000,000			85,000,000
Aggregate principal amount			$ 85,000,000					85,000,000			85,000,000
Interest rate			6.42%
Senior Notes | Series B Tranche B Notes
Line of Credit Facility [Line Items]
Spread on variable rate			3.24%
Borrowings outstanding								25,000,000			25,000,000
Aggregate principal amount			$ 25,000,000					25,000,000			25,000,000
Senior Notes | Series B Tranche C Notes
Line of Credit Facility [Line Items]
Borrowings outstanding								290,000,000			290,000,000
Aggregate principal amount			$ 290,000,000					290,000,000			$ 290,000,000
Interest rate			6.52%
Borrowings on debt	$ 90,000,000	$ 100,000,000	$ 100,000,000
Senior Notes | Series C Senior Notes
Line of Credit Facility [Line Items]
Aggregate principal amount										$ 100,000,000
Senior Notes | Series C Tranche A Notes
Line of Credit Facility [Line Items]
Borrowings outstanding								25,000,000
Aggregate principal amount								25,000,000		$ 25,000,000
Interest rate										6.05%
Senior Notes | Series C Tranche B Notes
Line of Credit Facility [Line Items]
Borrowings outstanding								75,000,000
Aggregate principal amount								$ 75,000,000		$ 75,000,000
Interest rate										6.40%