INVESTMENTS - Schedule of Investments (Details) - USD ($)	Sep. 30, 2026	Dec. 31, 2025
Schedule of Investments [Line Items]
Cost	$ 10,294,764,000	$ 2,988,655,000
Fair Value	10,566,935,000	3,120,386,000
Derivative asset contracts, fair value, cost	0	0
Derivative asset contracts, at fair value	80,813,000	9,358,000
Derivative liability contracts, fair value, cost	0	0
Derivative liability contracts, at fair value	(941,000)	(6,274,000)
Total derivative contracts, cost	0	0
Total derivative contracts, fair value	79,872,000	3,084,000
Common equity
Schedule of Investments [Line Items]
Cost	6,293,428,000	2,049,696,000
Fair Value	6,516,384,000	2,168,096,000
Preferred equity
Schedule of Investments [Line Items]
Cost	1,047,597,000	0
Fair Value	1,047,597,000	0
Other equity
Schedule of Investments [Line Items]
Cost	945,844,000	340,995,000
Fair Value	987,596,000	354,399,000
First lien senior secured loans
Schedule of Investments [Line Items]
Cost	1,441,230,000	507,515,000
Fair Value	1,446,172,000	508,273,000
Senior subordinated loans
Schedule of Investments [Line Items]
Cost	506,866,000	90,449,000
Fair Value	510,064,000	89,618,000
Corporate bonds
Schedule of Investments [Line Items]
Cost	59,799,000	0
Fair Value	$ 59,122,000	$ 0