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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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