Derivative Instruments - Schedule of Net Realized and Unrealized Gains (Losses) on Derivative Instruments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net change in unrealized gain (loss) on derivative instruments	$ 5,064	$ (590)
Net realized and unrealized gains and losses on derivative instruments	(6,777)	(66,749)
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	69,852	(26,539)
Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net realized and unrealized gains and losses on derivative instruments	(1,058)	(465)
Foreign Currency Forward Contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net realized and unrealized gains and losses on derivative instruments	(7,427)	(67,336)
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	64,788	(25,949)
Currency Swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net realized and unrealized gains and losses on derivative instruments	650	587
Currency Swaps \| Net change in unrealized appreciation (depreciation) on derivatives
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net change in unrealized gain (loss) on derivative instruments	5,528	(590)
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	31,639	(60,530)
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	(32,697)	60,065
Options \| Net change in unrealized appreciation (depreciation) on derivatives
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net change in unrealized gain (loss) on derivative instruments	$ (464)	$ (0)