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Unaudited Consolidated Schedule of Investments - Additional Information (Parenthetical) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Schedule of Investments [Line Items] |  |  |  |
Cost | $ 2,551,299,000 |  | $ 2,535,576,000 |
Total investments at fair value | $ 2,527,537,000 |  | $ 2,488,715,000 |
Percent of net assets | 208.60% | [1] | 208.00% |
Non-qualifying assets | 29.10% |  | 28.80% |
Forward currency contracts | $ 15,833,000 |  |  |
Aerospace and Defense |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total investments at fair value | $ 137,956,000 |  | $ 132,498,000 |
Percent of net assets | 11.40% |  | 11.10% |
Automotive |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total investments at fair value | $ 71,897,000 |  | $ 80,828,000 |
Percent of net assets | 5.90% |  | 6.70% |
Banking, Finance, Insurance and Real Estate |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total investments at fair value | $ 406,291,000 |  | $ 401,816,000 |
Percent of net assets | 33.50% |  | 33.60% |
Beverage, Food and Tobacco |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total investments at fair value | $ 33,518,000 |  | $ 23,135,000 |
Percent of net assets | 2.80% |  | 1.90% |
Capital Equipment |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total investments at fair value | $ 136,168,000 |  | $ 128,706,000 |
Percent of net assets | 11.20% |  | 10.80% |
Chemicals, Plastics, and Rubber |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total investments at fair value | $ 40,937,000 |  | $ 35,897,000 |
Percent of net assets | 3.40% |  | 3.00% |
Construction and Building |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total investments at fair value | $ 30,684,000 |  | $ 30,387,000 |
Percent of net assets | 2.50% |  | 2.50% |
Consumer goods: Durable |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total investments at fair value | $ 49,236,000 |  | $ 47,074,000 |
Percent of net assets | 4.10% |  | 3.90% |
Consumer goods: Non-durable |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total investments at fair value | $ 36,108,000 |  | $ 28,210,000 |
Percent of net assets | 3.00% |  | 2.40% |
Containers, Packaging and Glass |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total investments at fair value | $ 37,542,000 |  | $ 37,524,000 |
Percent of net assets | 3.10% |  | 3.10% |
Energy: Electricity |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total investments at fair value | $ 29,079,000 |  | $ 20,874,000 |
Percent of net assets | 2.40% |  | 1.70% |
Energy: Oil and Gas |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total investments at fair value | $ 3,236,000 |  | $ 3,240,000 |
Percent of net assets | 0.30% |  | 0.30% |
Environmental Industries |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total investments at fair value | $ 51,501,000 |  | $ 53,484,000 |
Percent of net assets | 4.20% |  | 4.50% |
Healthcare and Pharmaceuticals |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total investments at fair value | $ 190,321,000 |  | $ 216,952,000 |
Percent of net assets | 15.70% |  | 18.10% |
High Tech Industries |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total investments at fair value | $ 304,442,000 |  | $ 303,082,000 |
Percent of net assets | 25.10% |  | 25.40% |
Hotel, Gaming and Leisure |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total investments at fair value | $ 55,991,000 |  | $ 54,256,000 |
Percent of net assets | 4.60% |  | 4.50% |
Investment Funds and Vehicles |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total investments at fair value | $ 110,694,000 |  | $ 110,066,000 |
Percent of net assets | 9.10% |  | 9.20% |
Media: Advertising, Printing and Publishing |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total investments at fair value | $ 38,931,000 |  | $ 39,447,000 |
Percent of net assets | 3.20% |  | 3.30% |
Media: Broadcasting and Subscription |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total investments at fair value | $ 13,060,000 |  | $ 13,277,000 |
Percent of net assets | 1.10% |  | 1.10% |
Media: Diversified and Production |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total investments at fair value | $ 65,449,000 |  | $ 64,559,000 |
Percent of net assets | 5.40% |  | 5.40% |
Metals and Mining |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total investments at fair value | $ 9,015,000 |  | $ 8,993,000 |
Percent of net assets | 0.70% |  | 0.80% |
Services: Business |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total investments at fair value | $ 366,291,000 |  | $ 326,762,000 |
Percent of net assets | 30.20% |  | 27.30% |
Services: Consumer |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total investments at fair value | $ 61,307,000 |  | $ 61,409,000 |
Percent of net assets | 5.10% |  | 5.10% |
Structured products |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total investments at fair value | $ 104,014,000 |  | $ 102,922,000 |
Percent of net assets | 8.60% |  | 8.60% |
Telecommunications |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total investments at fair value | $ 27,535,000 |  | $ 27,565,000 |
Percent of net assets | 2.30% |  | 2.30% |
Transportation: Cargo |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total investments at fair value | $ 88,075,000 |  | $ 96,450,000 |
Percent of net assets | 7.30% |  | 8.10% |
Transportation: Consumer |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total investments at fair value | $ 12,882,000 |  | $ 11,951,000 |
Percent of net assets | 1.10% |  | 1.00% |
Utilities: Electric |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total investments at fair value | $ 15,377,000 |  | $ 22,696,000 |
Percent of net assets | 1.30% |  | 1.90% |
Utilities: Oil and Gas |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total investments at fair value | $ 0 |  | $ 4,655,000 |
Percent of net assets | 0.00% |  | 0.40% |
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 100.00% |  | 100.00% |
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Aerospace and Defense |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 5.50% |  | 5.30% |
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Automotive |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 2.90% |  | 3.30% |
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Banking, Finance, Insurance and Real Estate |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 16.10% |  | 16.10% |
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Beverage, Food and Tobacco |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 1.30% |  | 0.90% |
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Capital Equipment |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 5.40% |  | 5.20% |
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Chemicals, Plastics, and Rubber |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 1.60% |  | 1.50% |
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Construction and Building |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 1.20% |  | 1.20% |
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Consumer goods: Durable |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 2.00% |  | 1.90% |
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Consumer goods: Non-durable |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 1.40% |  | 1.10% |
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Containers, Packaging and Glass |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 1.50% |  | 1.50% |
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Energy: Electricity |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 1.20% |  | 0.80% |
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Energy: Oil and Gas |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 0.10% |  | 0.10% |
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Environmental Industries |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 2.00% |  | 2.10% |
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Healthcare and Pharmaceuticals |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 7.50% |  | 8.70% |
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | High Tech Industries |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 12.00% |  | 12.20% |
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Hotel, Gaming and Leisure |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 2.20% |  | 2.20% |
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Investment Funds and Vehicles |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 4.40% |  | 4.40% |
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Media: Advertising, Printing and Publishing |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 1.50% |  | 1.60% |
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Media: Broadcasting and Subscription |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 0.50% |  | 0.50% |
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Media: Diversified and Production |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 2.60% |  | 2.60% |
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Metals and Mining |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 0.40% |  | 0.40% |
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Services: Business |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 14.50% |  | 13.20% |
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Services: Consumer |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 2.40% |  | 2.50% |
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Structured products |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 4.10% |  | 4.10% |
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Telecommunications |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 1.10% |  | 1.10% |
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Transportation: Cargo |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 3.50% |  | 3.90% |
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Transportation: Consumer |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 0.50% |  | 0.50% |
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Utilities: Electric |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 0.60% |  | 0.90% |
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Utilities: Oil and Gas |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 0.00% |  | 0.20% |
Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 100.00% |  | 100.00% |
Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 100.00% |  | 100.00% |
Senior debt and 1st lien notes |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Cost | $ 1,699,117,000 |  | $ 1,705,353,000 |
Total investments at fair value | $ 1,658,742,000 |  | $ 1,670,300,000 |
Percent of net assets | 137.00% |  | 140.00% |
Senior debt and 1st lien notes | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 66.00% |  | 67.00% |
Senior debt and 1st lien notes | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 67.00% |  | 67.00% |
Subordinated debt and 2nd lien notes |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Cost | $ 260,225,000 |  | $ 256,850,000 |
Total investments at fair value | $ 246,902,000 |  | $ 238,215,000 |
Percent of net assets | 21.00% |  | 20.00% |
Subordinated debt and 2nd lien notes | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 10.00% |  | 10.00% |
Subordinated debt and 2nd lien notes | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 10.00% |  | 10.00% |
Structured products |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Cost | $ 105,043,000 |  | $ 107,314,000 |
Total investments at fair value | $ 95,131,000 |  | $ 93,038,000 |
Percent of net assets | 8.00% |  | 8.00% |
Structured products | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 4.00% |  | 4.00% |
Structured products | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 4.00% |  | 4.00% |
Equity shares |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Cost | $ 343,533,000 |  | $ 320,335,000 |
Total investments at fair value | $ 413,482,000 |  | $ 374,704,000 |
Percent of net assets | 34.00% |  | 31.00% |
Equity shares | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 16.00% |  | 15.00% |
Equity shares | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 13.00% |  | 13.00% |
Equity warrants |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Cost | $ 129,000 |  | $ 76,000 |
Total investments at fair value | $ 2,586,000 |  | $ 2,392,000 |
Percent of net assets | 0.00% |  | 0.00% |
Equity warrants | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 0.00% |  | 0.00% |
Equity warrants | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 0.00% |  | 0.00% |
Investment in joint ventures / PE fund |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Cost | $ 143,252,000 |  | $ 145,648,000 |
Total investments at fair value | $ 110,694,000 |  | $ 110,066,000 |
Percent of net assets | 9.00% |  | 9.00% |
Investment in joint ventures / PE fund | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 4.00% |  | 4.00% |
Investment in joint ventures / PE fund | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 6.00% |  | 6.00% |
MVC Credit Support Agreement |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Forward currency contracts | $ 2,450,000 |  | $ 3,700,000 |
MVC Credit Support Agreement | Barings LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Forward currency contracts | 2,450,000 | [2],[3],[4] | 3,700,000 | [5],[6],[7]
Notional Amount | 23,000,000 | [2],[3],[4] | 23,000,000 | [5],[6],[7]
Sierra Credit Support Agreement |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Forward currency contracts | (9,000,000) |  |  |
Sierra Credit Support Agreement | Barings LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Forward currency contracts | (9,000,000) | [8],[9],[10] | (3,900,000) | [11],[12],[13]
Notional Amount | 100,000,000 | [8],[9],[10] | 100,000,000 | [11],[12],[13]
MVC Private Equity Fund LP |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Cost | 8,160,000 |  | 8,160,000 |
Total investments at fair value | 511,000 |  | 1,005,000 |
Control investments |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Cost | 103,553,000 |  | 103,163,000 |
Total investments at fair value | $ 103,116,000 |  | $ 90,920,000 |
Percent of net assets | 8.50% |  | 7.60% |
Control investments | MVC Private Equity Fund LP |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total investments at fair value | $ 511,000 |  | $ 1,005,000 |
February 21, 2019 | Line of Credit |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Commitment aggregate amount | $ 1,065,000,000 |  | $ 1,065,000,000 |
[1] | Fair value as a percentage of net assets.
[2] | (a) The MVC Credit Support Agreement (as defined in “Note 2. Agreements and Related Party Transactions”) covers all of the investments acquired by Barings BDC, Inc. (the “Company”) from MVC Capital, Inc. (“MVC”) in connection with the MVC Acquisition (as defined in “Note 2. Agreements and Related Party Transactions”) and any investments received by the Company in connection with the restructuring, amendment, extension or other modification (including the issuance of new securities) of any of the investments acquired by the Company from MVC in connection with the MVC Acquisition (collectively, the “MVC Reference Portfolio”). Each investment that is included in the MVC Reference Portfolio is denoted in the above Schedule of Investments with footnote (28).
[3] | (b) The Company and Barings LLC (“Barings” or the “Adviser”) entered into the MVC Credit Support Agreement pursuant to which Barings agreed to provide credit support to the Company in the amount of up to $23.0 million.
[4] | (c) Settlement Date means the earlier of (1) January 1, 2031 or (2) the date on which the entire MVC Reference Portfolio has been realized or written off.
[5] | Settlement Date means the earlier of (1) January 1, 2031 or (2) the date on which the entire MVC Reference Portfolio has been realized or written off.
[6] | The Company and Barings entered into the MVC Credit Support Agreement pursuant to which Barings agreed to provide credit support to the Company in the amount of up to $23.0 million.
[7] | The MVC Credit Support Agreement covers all of the investments acquired by the Company from MVC in connection with the MVC Acquisition and any investments received by the Company in connection with the restructuring, amendment, extension or other modification (including the issuance of new securities) of any of the MVC Reference Portfolio. Each investment that is included in the MVC Reference Portfolio is denoted in the above Schedule of Investments with footnote (28).
[8] | (d) See “Note 2. Agreements and Related Party Transactions” for additional information regarding the Credit Support Agreements.
[9] | (e) The Sierra Credit Support Agreement (as defined in “Note 2. Agreements and Related Party Transactions”) covers all of the investments acquired by the Company from Sierra Income Corporation (“Sierra”) in connection with the Sierra Merger (as defined in “Note 2. Agreements and Related Party Transactions”) and any investments received by the Company in connection with the restructuring, amendment, extension or other modification (including the issuance of new securities) of any of the investments acquired by the Company from Sierra in connection with the Sierra Merger (collectively, the “Sierra Reference Portfolio”). Each investment that is included in the Sierra Reference Portfolio is denoted in the above Schedule of Investments with footnote (29).
[10] | (f) The Company and Barings entered into the Sierra Credit Support Agreement pursuant to which Barings agreed to provide credit support to the Company in the amount of up to $100.0 million.
[11] | Settlement Date means the earlier of (1) April 1, 2032 or (2) the date on which the entire Sierra Reference Portfolio has been realized or written off.
[12] | The Company and Barings entered into the Sierra Credit Support Agreement pursuant to which Barings agreed to provide credit support to the Company in the amount of up to $100.0 million.
[13] | The Sierra Credit Support Agreement covers all of the investments acquired by the Company from Sierra in connection with the Sierra Merger and any investments received by the Company in connection with the restructuring, amendment, extension or other modification (including the issuance of new securities) of any of the Sierra Reference Portfolio. Each investment that is included in the Sierra Reference Portfolio is denoted in the above Schedule of Investments with footnote (29).

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