Fair Value of Investments - Fair Value Hierarchy of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2024		Dec. 31, 2023
Assets at Fair Value
Investments at fair value	$ 3,161,223	[1],[2]	$ 1,398,419	[3],[4]
Total financial instruments, at fair value	3,162,244		1,398,419
Liabilities at Fair Value
Total	(14,000)
Levels 1, 2 and 3
Assets at Fair Value
Total financial instruments, at fair value	3,081,590		1,343,705
Level 1
Assets at Fair Value
Total financial instruments, at fair value	0		0
Liabilities at Fair Value
Total	0
Level 2
Assets at Fair Value
Total financial instruments, at fair value	1,021		0
Liabilities at Fair Value
Total	(14,000)
Level 3
Assets at Fair Value
Total financial instruments, at fair value	3,080,569		1,343,705
Liabilities at Fair Value
Total	0
Fair value measured at net asset value
Assets at Fair Value
Investments at fair value	80,654		54,714
Foreign currency forward contracts
Assets at Fair Value
Derivative assets	60
Liabilities at Fair Value
Derivative liabilities	(14)		(44)
Foreign currency forward contracts | Level 1
Assets at Fair Value
Derivative assets	0
Liabilities at Fair Value
Derivative liabilities	0		0
Foreign currency forward contracts | Level 2
Assets at Fair Value
Derivative assets	60
Liabilities at Fair Value
Derivative liabilities	(14)		(44)
Foreign currency forward contracts | Level 3
Assets at Fair Value
Derivative assets	0
Liabilities at Fair Value
Derivative liabilities	0		0
Interest rate swaps and options
Assets at Fair Value
Derivative assets	961
Liabilities at Fair Value
Derivative liabilities	(13,986)
Interest rate swaps and options | Level 1
Assets at Fair Value
Derivative assets	0
Liabilities at Fair Value
Derivative liabilities	0
Interest rate swaps and options | Level 2
Assets at Fair Value
Derivative assets	961
Liabilities at Fair Value
Derivative liabilities	(13,986)
Interest rate swaps and options | Level 3
Assets at Fair Value
Derivative assets	0
Liabilities at Fair Value
Derivative liabilities	0
First lien senior secured debt
Assets at Fair Value
Investments at fair value	3,080,554		1,343,692
First lien senior secured debt | Level 1
Assets at Fair Value
Investments at fair value	0		0
First lien senior secured debt | Level 2
Assets at Fair Value
Investments at fair value	0		0
First lien senior secured debt | Level 3
Assets at Fair Value
Investments at fair value	3,080,554		1,343,692
Sponsor subordinated note
Assets at Fair Value
Investments at fair value	15		13
Sponsor subordinated note | Level 1
Assets at Fair Value
Investments at fair value	0		0
Sponsor subordinated note | Level 2
Assets at Fair Value
Investments at fair value	0		0
Sponsor subordinated note | Level 3
Assets at Fair Value
Investments at fair value	$ 15		$ 13

[1] Unless otherwise indicated, all investments represent co-investments made with the Company’s affiliates in accordance with the terms of the exemptive relief that the Company received from the U.S. Securities and Exchange Commission. Refer to Note 6 for further information.

[2] Unless otherwise indicated, all investments are considered Level 3 investments.

[3] Unless otherwise indicated, all investments are considered Level 3 investments.

[4] Unless otherwise indicated, all investments represent co-investments made with the Company’s affiliates in accordance with the terms of the exemptive relief that the Company received from the U.S. Securities and Exchange Commission. Refer to Note 6 for further information.