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Borrowings - Jackson Hole Funding Facility (Details)	Sep. 16, 2022	Dec. 31, 2023 USD ($)	Dec. 31, 2023 EUR (€)	Dec. 31, 2022 USD ($)	Dec. 31, 2022 EUR (€)	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Asset coverage ratio		200.30%	200.30%	174.80%	174.80%	180.20%	230.00%	215.10%	227.80%
Jackson Hole Funding Facility, Foreign Currency Advances | Line of Credit | Revolving Credit Facility | SOFR
Debt Instrument [Line Items]
Basis spread on variable rate	2.375%
Jackson Hole Funding Facility, Dollar Advances | Line of Credit | Revolving Credit Facility | SOFR
Debt Instrument [Line Items]
Basis spread on variable rate	2.525%
Jackson Hole Funding Facility | Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Unused capacity, commitment fee percentage	0.48%
Line of credit facility, maximum borrowing capacity		$ 500,000,000	€ 0	$ 400,000,000	€ 0
Maximum borrowing capacity including the accordion feature		$ 900,000,000

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