Derivative Instruments - Schedule of Net Realized and Unrealized Gains (Losses) on Derivative Instruments (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net change in unrealized gain (loss) on derivative instruments	$ (18,299)	$ (14,878)	$ (13,235)	$ (15,468)
Net realized and unrealized gains and losses on derivative instruments	5,270	(142,049)	(1,507)	(208,798)
Net Change In Unrealized Appreciation (Depreciation) On Foreign Currency Forward Contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net change in unrealized gain (loss) on derivative instruments	33,323	(90,389)	103,175	(116,928)
Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net realized and unrealized gains and losses on derivative instruments	(1,317)	4,984	(2,374)	4,519
Foreign Currency Forward Contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net realized and unrealized gains and losses on derivative instruments	(4,844)	(142,729)	(12,271)	(210,065)
Foreign Currency Forward Contracts \| Net Change In Unrealized Appreciation (Depreciation) On Foreign Currency Forward Contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net change in unrealized gain (loss) on derivative instruments	51,622	(75,511)	116,410	(101,460)
Currency Swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net realized and unrealized gains and losses on derivative instruments	10,114	680	10,764	1,267
Currency Swaps \| Currency Rate Swaps Derivative Contracts Gain Loss Unrealized [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net change in unrealized gain (loss) on derivative instruments	(13,476)	(14,878)	(7,947)	(15,468)
Interest Rate Swaps \| Designated as Hedging Instrument \| Interest And Other Debt Expenses
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net realized and unrealized gains and losses on derivative instruments	53,176	(22,254)	84,816	(82,784)
Hedged Items \| Designated as Hedging Instrument \| Interest And Other Debt Expenses
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net realized and unrealized gains and losses on derivative instruments	(54,493)	27,238	(87,190)	87,303
Options \| Currency Rate Swaps Derivative Contracts Gain Loss Unrealized [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net change in unrealized gain (loss) on derivative instruments	$ (4,823)	$ 0	$ (5,288)	$ 0