Borrowings - Revolving Credit Facility (Details) € in Thousands, £ in Thousands, $ in Thousands		3 Months Ended				9 Months Ended
	Oct. 20, 2023 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2025 AUD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2024 AUD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2025 AUD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2024 AUD ($)	Sep. 30, 2025 AUD ($)	Sep. 30, 2025 GBP (£)	Sep. 30, 2025 EUR (€)	Dec. 31, 2024 USD ($)	Dec. 31, 2024 AUD ($)	Dec. 31, 2024 GBP (£)	Dec. 31, 2024 EUR (€)
Line of Credit Facility [Line Items]
Debt		$ 2,775,533,000				$ 2,775,533,000							$ 2,151,713,000
Unrealized gain (loss) on foreign currency and other transactions		1,131,000		$ (2,881,000)		(8,895,000)		$ (2,588,000)
Net assets		2,705,132,000		$ 1,879,965,000		2,705,132,000		$ 1,879,965,000
Revolving Credit Agreement | Interest expense - Revolving Credit Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 295,000,000	785,000,000				785,000,000
Accordion feature, total facility amount	$ 800,000,000
Debt		$ 256,500,000				$ 256,500,000							$ 396,100,000
Unrealized gain (loss) on foreign currency and other transactions			$ 1,144		$ (2,998)		$ (8,903)		$ (2,703)
Weighted average interest rate		6.20%				6.20%				6.20%	6.20%	6.20%	7.00%	7.00%	7.00%	7.00%
Revolving credit facility maximum borrowing capacity percentage	72.50%
Net assets	$ 500,000,000
Amount equal to net assets	$ 1,063,400,000
Percentage equal to net assets	65.00%
Ratio of total assets to total liabilities	1.5
Senior debt coverage ratio	2
Minimum net worth equal required	$ 500,000,000
Distributions in cash or property other than common stock percentage	1.15
Revolving Credit Agreement | Interest expense - Revolving Credit Facility | Interest rate in case of any U.S. dollar advances | Alternate base rate
Line of Credit Facility [Line Items]
Interest rate, basis spread	1.25%
Revolving Credit Agreement | Interest expense - Revolving Credit Facility | Interest rate in case of any U.S. dollar advances | Adjusted Term SOFR
Line of Credit Facility [Line Items]
Interest rate, basis spread	2.25%
Revolving Credit Agreement | Interest expense - Revolving Credit Facility | Interest rate in case of any U.S. dollar advances | Applicable benchmark rate
Line of Credit Facility [Line Items]
Interest rate, basis spread	2.25%
Revolving Credit Agreement | Interest expense - Revolving Credit Facility | Interest rate in case of any U.S. dollar advances | Daily Simple RFR
Line of Credit Facility [Line Items]
Interest rate, basis spread	2.50%
Revolving Credit Agreement | Interest expense - Revolving Credit Facility | Interest rate in case of any U.S. dollar advances at any time the Rating Condition is satisfied | Alternate base rate
Line of Credit Facility [Line Items]
Interest rate, basis spread	1.15%
Revolving Credit Agreement | Interest expense - Revolving Credit Facility | Interest rate in case of any U.S. dollar advances at any time the Rating Condition is satisfied | Adjusted Term SOFR
Line of Credit Facility [Line Items]
Interest rate, basis spread	2.15%
Revolving Credit Agreement | Interest expense - Revolving Credit Facility | Interest rate in case of any U.S. dollar advances at any time the Rating Condition is satisfied | Applicable benchmark rate
Line of Credit Facility [Line Items]
Interest rate, basis spread	2.15%
Revolving Credit Agreement | Interest expense - Revolving Credit Facility | Interest rate in case of any U.S. dollar advances at any time the Rating Condition is satisfied | Daily Simple RFR
Line of Credit Facility [Line Items]
Interest rate, basis spread	2.35%
Revolving Credit Agreement | Revolving Credit Facility With Australian Dollar Denominated Borrowings
Line of Credit Facility [Line Items]
Debt		$ 26,453,000				$ 26,453,000				$ 40,000			$ 13,599,000	$ 21,978
Revolving Credit Agreement | Revolving Credit Facility With British Pound Denominated Borrowings
Line of Credit Facility [Line Items]
Debt		53,785,000				53,785,000					£ 40,000		48,111,000		£ 38,440
Revolving Credit Agreement | Revolving Credit Facility With Euros Denominated Borrowings
Line of Credit Facility [Line Items]
Debt		$ 28,456,000				$ 28,456,000						€ 24,250	$ 23,296,000			€ 22,500