Fair Value of Investments - Schedule of Significant Unobservable Inputs (Details) $ in Thousands	Sep. 30, 2025 USD ($)		Dec. 31, 2024 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value	$ 3,900,686	[1],[2]	$ 3,161,223	[3],[4]
Discounted cash flow and market comparable | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value	3,518,792		2,386,617
First lien senior secured debt | Discounted cash flow and market comparable | Level 3 | Yield and LTM Revenue multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value	5,670
First lien senior secured debt | Discounted cash flow and market comparable | Level 3 | Yield and Forward Revenue multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value	$ 136
First lien senior secured debt | Discounted cash flow and market comparable | Level 3 | LTM Revenue multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value, measurement input	1.3
First lien senior secured debt | Discounted cash flow and market comparable | Level 3 | Forward Revenue multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value, measurement input	0.3
First lien senior secured debt | Discounted cash flow | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value			2,379,881
First lien senior secured debt | Discounted cash flow | Level 3 | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value	$ 3,466,446
First lien senior secured debt | Market comparable | Level 3 | LTM Revenue multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value	3,693		$ 2,048
Investments at fair value, measurement input			0.6
First lien senior secured debt | Market comparable | Level 3 | LTM EBITDA multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value	$ 34,370		$ 1,845
Investments at fair value, measurement input			14.3
First lien senior secured debt | Market comparable | Level 3 | LTM EBITDA multiple 2
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value, measurement input	10.3
First lien senior secured debt | Market comparable | Level 3 | Forward EBITDA multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value	$ 1,141		$ 1,345
Investments at fair value, measurement input			8.4
First lien senior secured debt | Market comparable | Level 3 | Forward EBITDA multiple 1
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value, measurement input	10.5
First lien senior secured debt | Market comparable | Level 3 | Forward EBITDA multiple 2
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value, measurement input	7.3
First lien senior secured debt | Market comparable | Level 3 | Forward EBITDA multiple 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value, measurement input	8.0
First lien senior secured debt | Market comparable | Level 3 | Forward Revenue multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value	$ 1,964		$ 1,483
First lien senior secured debt | Market comparable | Level 3 | Forward Revenue multiple 2
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value, measurement input	0.5
First lien senior secured debt | Market comparable | Level 3 | Forward Revenue multiple and Forward EBITDA multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value	$ 2,106
First lien senior secured debt | Market comparable | Level 3 | LTM EBITDA multiple and Forward EBITDA multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value	1,645
First lien senior secured debt | Market comparable | Level 3 | LTM Revenue multiple and Forward Revenue multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value	$ 1,603
First lien senior secured debt | Minimum | Discounted cash flow and market comparable | Level 3 | Yield 1
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value, measurement input	0.124
First lien senior secured debt | Minimum | Discounted cash flow and market comparable | Level 3 | Yield 2
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value, measurement input	0.247
First lien senior secured debt | Minimum | Discounted cash flow | Level 3 | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value, measurement input	0.086		0.093
First lien senior secured debt | Minimum | Market comparable | Level 3 | LTM Revenue multiple 1
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value, measurement input	1.0
First lien senior secured debt | Minimum | Market comparable | Level 3 | LTM Revenue multiple 2
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value, measurement input	0.6
First lien senior secured debt | Minimum | Market comparable | Level 3 | LTM EBITDA multiple 1
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value, measurement input	7.6
First lien senior secured debt | Minimum | Market comparable | Level 3 | Forward Revenue multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value, measurement input			0.9
First lien senior secured debt | Minimum | Market comparable | Level 3 | Forward Revenue multiple 1
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value, measurement input	0.9
First lien senior secured debt | Minimum | Market comparable | Level 3 | Forward Revenue multiple 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value, measurement input	0.6
First lien senior secured debt | Maximum | Discounted cash flow and market comparable | Level 3 | Yield 1
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value, measurement input	0.125
First lien senior secured debt | Maximum | Discounted cash flow and market comparable | Level 3 | Yield 2
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value, measurement input	0.249
First lien senior secured debt | Maximum | Discounted cash flow | Level 3 | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value, measurement input	1.032		0.563
First lien senior secured debt | Maximum | Market comparable | Level 3 | LTM Revenue multiple 1
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value, measurement input	2.3
First lien senior secured debt | Maximum | Market comparable | Level 3 | LTM Revenue multiple 2
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value, measurement input	0.9
First lien senior secured debt | Maximum | Market comparable | Level 3 | LTM EBITDA multiple 1
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value, measurement input	14.0
First lien senior secured debt | Maximum | Market comparable | Level 3 | Forward Revenue multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value, measurement input			2.0
First lien senior secured debt | Maximum | Market comparable | Level 3 | Forward Revenue multiple 1
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value, measurement input	3.3
First lien senior secured debt | Maximum | Market comparable | Level 3 | Forward Revenue multiple 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value, measurement input	0.9
First lien senior secured debt | Weighted Average | Discounted cash flow and market comparable | Level 3 | Yield 1
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value, measurement input	0.124
First lien senior secured debt | Weighted Average | Discounted cash flow and market comparable | Level 3 | Yield 2
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value, measurement input	0.248
First lien senior secured debt | Weighted Average | Discounted cash flow and market comparable | Level 3 | LTM Revenue multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value, measurement input	1.3
First lien senior secured debt | Weighted Average | Discounted cash flow and market comparable | Level 3 | Forward Revenue multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value, measurement input	0.3
First lien senior secured debt | Weighted Average | Discounted cash flow | Level 3 | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value, measurement input	0.099		0.109
First lien senior secured debt | Weighted Average | Market comparable | Level 3 | LTM Revenue multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value, measurement input			0.6
First lien senior secured debt | Weighted Average | Market comparable | Level 3 | LTM Revenue multiple 1
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value, measurement input	1.5
First lien senior secured debt | Weighted Average | Market comparable | Level 3 | LTM Revenue multiple 2
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value, measurement input	0.6
First lien senior secured debt | Weighted Average | Market comparable | Level 3 | LTM EBITDA multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value, measurement input			14.3
First lien senior secured debt | Weighted Average | Market comparable | Level 3 | LTM EBITDA multiple 1
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value, measurement input	13.8
First lien senior secured debt | Weighted Average | Market comparable | Level 3 | LTM EBITDA multiple 2
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value, measurement input	10.3
First lien senior secured debt | Weighted Average | Market comparable | Level 3 | Forward EBITDA multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value, measurement input			8.4
First lien senior secured debt | Weighted Average | Market comparable | Level 3 | Forward EBITDA multiple 1
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value, measurement input	10.5
First lien senior secured debt | Weighted Average | Market comparable | Level 3 | Forward EBITDA multiple 2
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value, measurement input	7.3
First lien senior secured debt | Weighted Average | Market comparable | Level 3 | Forward EBITDA multiple 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value, measurement input	8.0
First lien senior secured debt | Weighted Average | Market comparable | Level 3 | Forward Revenue multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value, measurement input			1.3
First lien senior secured debt | Weighted Average | Market comparable | Level 3 | Forward Revenue multiple 1
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value, measurement input	1.2
First lien senior secured debt | Weighted Average | Market comparable | Level 3 | Forward Revenue multiple 2
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value, measurement input	0.5
First lien senior secured debt | Weighted Average | Market comparable | Level 3 | Forward Revenue multiple 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value, measurement input	0.6
Sponsor subordinated note
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value	$ 18		$ 15
Sponsor subordinated note | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value	18		15
Sponsor subordinated note | Market comparable | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value			$ 15
Sponsor subordinated note | Market comparable | Level 3 | LTM EBITDA multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value	$ 18
Investments at fair value, measurement input	7.6		7.6
Sponsor subordinated note | Weighted Average | Market comparable | Level 3 | LTM EBITDA multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value, measurement input	7.6		7.6

[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 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.

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