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Organization, Business, Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details) |  |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 23, 2023 USD ($) | May 06, 2022 $ / shares shares | Feb. 25, 2022 USD ($) | Dec. 23, 2020 USD ($) $ / shares shares | Aug. 02, 2018 USD ($) $ / shares shares | Apr. 03, 2018 USD ($) | Apr. 01, 2018 USD ($) | Dec. 31, 2023 USD ($) company investment $ / shares shares | Dec. 31, 2022 USD ($) investment company $ / shares shares
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Repayments received/sales of portfolio investments |  |  |  |  |  |  | $ 981,200,000 |  |  |
Payment for purchases of shares in repurchase plan |  |  |  |  |  |  |  | $ 14,772,000 |  | $ 32,105,000
Share repurchase program, term | 12 months |  |  |  |  |  |  |  |  |
Fair value |  |  |  |  |  |  |  | $ 2,488,715,000 | [1] | $ 2,448,935,000
Number of portfolio companies | company |  |  |  |  |  |  |  | 4 |  | 7
Investment Denominated In Canadian Dollars |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Number of investments | investment |  |  |  |  |  |  |  | 2 |  | 2
Investment Denominated In Danish Kroner |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Number of investments | investment |  |  |  |  |  |  |  | 1 |  | 1
Investment Denominated In Australian Dollars |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Number of investments | investment |  |  |  |  |  |  |  | 11 |  | 11
Investment Denominated In New Zealand Dollars |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Number of investments | investment |  |  |  |  |  |  |  | 2 |  | 2
Investment Denominated In Norwegian Krone |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Number of investments | investment |  |  |  |  |  |  |  | 1 |  | 1
Investment Denominated In Swiss Francs |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Number of investments | investment |  |  |  |  |  |  |  | 2 |  | 1
Investment Denominated In Swedish Krone |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Number of investments | investment |  |  |  |  |  |  |  | 2 |  | 1
Investment Denominated In Euros |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Number of investments | investment |  |  |  |  |  |  |  | 67 |  | 58
Investment Denominated In British Pounds Sterling |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Number of investments | investment |  |  |  |  |  |  |  | 28 |  | 28
Senior debt and 1st lien notes |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Fair value |  |  |  |  |  |  |  | $ 1,670,300,000 |  | $ 1,696,192,000
Senior debt and 1st lien notes | Market Approach | Yield Analysis |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Number of investments | investment |  |  |  |  |  |  |  | 6 |  |
Fair value |  |  |  |  |  |  |  | $ 20,000,000 |  |
Senior debt and 1st lien notes | Valuation, Unadjusted Prices From Independent Pricing Services And Independent Indicative Broker Quotes | Discount Rate | Discounted Cash Flow Analysis |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Number of investments | investment |  |  |  |  |  |  |  | 1 |  |
Fair value |  |  |  |  |  |  |  | $ 9,900,000 |  |
Structured Products |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Fair value |  |  |  |  |  |  |  | $ 93,038,000 |  | 73,550,000
Structured Products | Market Approach | Expected Recovery |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Number of investments | investment |  |  |  |  |  |  |  | 1 |  |
Fair value |  |  |  |  |  |  |  | $ 0 |  |
Structured Products | Valuation, Unadjusted Prices From Independent Pricing Services And Independent Indicative Broker Quotes | Discounted Cash Flow Analysis |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Number of investments | investment |  |  |  |  |  |  |  | 1 |  |
Fair value |  |  |  |  |  |  |  | $ 3,300,000 |  |
Equity shares |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Fair value |  |  |  |  |  |  |  | $ 374,704,000 |  | $ 284,570,000
Equity shares | Market Approach | Yield Analysis |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Number of investments | investment |  |  |  |  |  |  |  | 1 |  |
Fair value |  |  |  |  |  |  |  | $ 5,300,000 |  |
Single Portfolio Company | Percentage of Total Portfolio, at Fair Value | Portfolio Company Investment Risk |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Percent of total portfolio |  |  |  |  |  |  |  | 6.30% |  | 5.90%
MVC |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock aggregate amount |  |  |  | $ 15,000,000 |  |  |  |  |  |
Common stock market price percent of NAV, threshold |  |  |  | 90.00% |  |  |  |  |  |
Shares of common stock repurchased (in shares) | shares |  | 207,677 |  | 207,677 |  |  |  |  |  |
Shares of common stock repurchased, average price (in dollars per share) | $ / shares |  | $ 10.14 |  | $ 10.14 |  |  |  |  |  |
Sierra Merger |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock aggregate amount |  |  | $ 30,000,000 |  |  |  |  |  |  |
Common stock market price percent of NAV, threshold |  |  | 90.00% |  |  |  |  |  |  |
Shares of common stock repurchased (in shares) | shares |  |  |  |  |  |  |  | 1,849,096 |  | 3,179,168
Shares of common stock repurchased, average price (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 7.99 |  | $ 9.44
Payment for purchases of shares in repurchase plan |  |  |  |  |  |  |  |  |  | $ 30,000,000
Number of portfolio companies | company |  |  |  |  |  |  |  | 1 |  | 4
MVC Acquisition |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Number of portfolio companies | company |  |  |  |  |  |  |  | 1 |  | 2
Barings LLC |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Number of portfolio companies | company |  |  |  |  |  |  |  | 2 |  | 1
Common Stock |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock aggregate amount | $ 30,000,000 |  | $ 30,000,000 | $ 15,000,000 |  |  |  |  |  |
Common stock market price percent of NAV, threshold |  |  | 90.00% | 90.00% |  |  |  |  |  |
Shares of common stock repurchased (in shares) | shares |  |  |  |  |  |  |  | 1,849,096 |  | 3,386,845
Payment for purchases of shares in repurchase plan |  |  |  |  |  |  |  | $ 2,000 |  | $ 3,000
Common Stock | Sierra Merger |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Payment for purchases of shares in repurchase plan |  |  |  |  |  |  |  |  |  | $ 30,000,000
Private Placement |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares issued in transaction (in shares) | shares |  |  |  |  | 8,529,917 |  |  |  |  |
Price per share (in dollars per share) | $ / shares |  |  |  |  | $ 11.723443 |  |  |  |  |
Consideration received |  |  |  |  | $ 100,000,000 |  |  |  |  |
Barings LLC | Payment To Shareholders | Affiliated Entity |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Related party transaction amount (up to) |  |  |  |  |  | $ 85,000,000 |  |  |  |
Barings LLC | Payment For Company Common Stock At Net Asset Value | Affiliated Entity |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Related party transaction amount (up to) |  |  |  |  |  | 100,000,000 |  |  |  |
Barings LLC | Purchase Of Common Stock At Market Value | Affiliated Entity |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Related party transaction amount (up to) |  |  |  |  |  | $ 50,000,000 |  |  |  |
Period of commitment |  |  |  |  |  | 2 years |  |  |  |
[1] | Fair value as a percentage of net assets.

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