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Borrowings - Revolving Credit Facility (Details) - Line of Credit € in Millions, £ in Millions, $ in Millions, $ in Millions | Jun. 09, 2023 USD ($) | Mar. 31, 2024 USD ($) | Mar. 31, 2024 EUR (€) | Mar. 31, 2024 CAD ($) | Mar. 31, 2024 GBP (£) | Mar. 31, 2024 AUD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 EUR (€) | Dec. 31, 2023 CAD ($) | Dec. 31, 2023 GBP (£)
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Term Loan | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 385,000,000 |  |  |  |  |  |  |  |  |
Letter of Credit | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | 175,000,000 |  |  |  |  |  |  |  |  |
Letter of Credit | CitiBank, Revolving Credit Facility, Foreign Currency Commitments 2026 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | 200,000,000 |  |  |  |  |  |  |  |  |
Letter of Credit | CitiBank, Revolving Credit Facility, Foreign Currency Commitments 2027 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 200,000,000 |  |  |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Asset coverage ratio | 1.50 |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 1,775,000,000 | € 101.1 | $ 1.0 | £ 113.2 | $ 1.0 | $ 1,775,000,000 | € 94.4 | $ 1.0 | £ 66.9
Unused capacity, commitment fee percentage | 0.375% |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Scenario 1 | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 0.75% |  |  |  |  |  |  |  |  |
Combined revolving debt amount multiplier | 1.6 |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Scenario 2 | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 0.875% |  |  |  |  |  |  |  |  |
Combined revolving debt amount multiplier | 1.6 |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Scenario 3 | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.75% |  |  |  |  |  |  |  |  |
Combined revolving debt amount multiplier | 1.6 |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Scenario 4 | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.875% |  |  |  |  |  |  |  |  |
Combined revolving debt amount multiplier | 1.6 |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Base Rate | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 0.50% |  |  |  |  |  |  |  |  |
Revolving Credit Facility | SOFR | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.00% |  |  |  |  |  |  |  |  |

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