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Fair Value - Unobservable Inputs (Details) $ in Thousands | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
--- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 3,221,247 | [1] | $ 3,174,364 | [2]
Level III |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | 3,136,291 |  | 2,843,456 |
Level III | First lien | Market & income approach |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 1,663,116 |  | $ 1,478,445 |
Level III | First lien | Market & income approach | EBITDA multiple | Low |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement Input | 4.8 |  | 4.5 |
Level III | First lien | Market & income approach | EBITDA multiple | High |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement Input | 38.0 |  | 32.5 |
Level III | First lien | Market & income approach | EBITDA multiple | Weighted Average |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement Input | 15.3 |  | 14.7 |
Level III | First lien | Market & income approach | Revenue multiple | Low |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement Input | 5.0 |  | 4.0 |
Level III | First lien | Market & income approach | Revenue multiple | High |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement Input | 19.5 |  | 19.5 |
Level III | First lien | Market & income approach | Revenue multiple | Weighted Average |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement Input | 9.5 |  | 7.0 |
Level III | First lien | Market & income approach | Discount rate | Low |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement Input | 0.083 |  | 0.048 |
Level III | First lien | Market & income approach | Discount rate | High |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement Input | 0.294 |  | 0.170 |
Level III | First lien | Market & income approach | Discount rate | Weighted Average |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement Input | 0.111 |  | 0.076 |
Level III | First lien | Market quote |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value |  |  | $ 55,326 |
Level III | First lien | Other |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 90,851 |  | 101,372 |
Level III | Second lien | Market & income approach |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 471,350 |  | $ 253,587 |
Level III | Second lien | Market & income approach | EBITDA multiple | Low |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement Input | 8.2 |  | 7.5 |
Level III | Second lien | Market & income approach | EBITDA multiple | High |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement Input | 32.0 |  | 32.0 |
Level III | Second lien | Market & income approach | EBITDA multiple | Weighted Average |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement Input | 15.2 |  | 15.2 |
Level III | Second lien | Market & income approach | Discount rate | Low |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement Input | 0.112 |  | 0.075 |
Level III | Second lien | Market & income approach | Discount rate | High |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement Input | 0.471 |  | 0.282 |
Level III | Second lien | Market & income approach | Discount rate | Weighted Average |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement Input | 0.137 |  | 0.113 |
Level III | Second lien | Market quote |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value |  |  | $ 22,528 |
Level III | Second lien | Other |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 8,718 |  | 43,005 |
Level III | Subordinated | Market & income approach |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 72,842 |  | $ 39,798 |
Level III | Subordinated | Market & income approach | EBITDA multiple | Low |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement Input | 8.0 |  | 8.0 |
Level III | Subordinated | Market & income approach | EBITDA multiple | High |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement Input | 23.5 |  | 14.5 |
Level III | Subordinated | Market & income approach | EBITDA multiple | Weighted Average |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement Input | 16.3 |  | 11.5 |
Level III | Subordinated | Market & income approach | Discount rate | Low |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement Input | 0.135 |  | 0.111 |
Level III | Subordinated | Market & income approach | Discount rate | High |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement Input | 0.297 |  | 0.184 |
Level III | Subordinated | Market & income approach | Discount rate | Weighted Average |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement Input | 0.170 |  | 0.160 |
Level III | Subordinated | Other |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value |  |  | $ 10,944 |
Level III | Equity and other | Market & income approach |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 793,468 |  | $ 824,151 |
Level III | Equity and other | Market & income approach | EBITDA multiple | Low |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement Input | 4.8 |  | 5.0 |
Level III | Equity and other | Market & income approach | EBITDA multiple | High |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement Input | 26.5 |  | 26.5 |
Level III | Equity and other | Market & income approach | EBITDA multiple | Weighted Average |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement Input | 13.0 |  | 12.7 |
Level III | Equity and other | Market & income approach | Revenue multiple | Low |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement Input | 10.5 |  | 5.0 |
Level III | Equity and other | Market & income approach | Revenue multiple | High |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement Input | 19.5 |  | 19.5 |
Level III | Equity and other | Market & income approach | Revenue multiple | Weighted Average |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement Input | 14.6 |  | 14.3 |
Level III | Equity and other | Market & income approach | Discount rate | Low |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement Input | 0.064 |  | 0.040 |
Level III | Equity and other | Market & income approach | Discount rate | High |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement Input | 0.440 |  | 0.313 |
Level III | Equity and other | Market & income approach | Discount rate | Weighted Average |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Measurement Input | 0.130 |  | 0.100 |
Level III | Equity and other | Other |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 35,946 |  | $ 14,300 |
[1] | New Mountain Finance Corporation (the "Company") generally acquires its investments in private transactions exempt from registration under the Securities Act of 1933, as amended (the "Securities Act"). These investments are generally subject to certain limitations on resale, and may be deemed to be "restricted securities" under the Securities Act.
[2] | New Mountain Finance Corporation (the "Company") generally acquires its investments in private transactions exempt from registration under the Securities Act of 1933, as amended (the "Securities Act"). These investments are generally subject to certain limitations on resale, and may be deemed to be "restricted securities" under the Securities Act.

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- Definition Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section 50 -Paragraph 6 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=99383244&loc=d3e12121-115841 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 5D -Subparagraph (SX 210.12-13D(Column C)) -URI https://asc.fasb.org/extlink&oid=122147990&loc=SL120429264-123010 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-12B(Column C)) -URI https://asc.fasb.org/extlink&oid=122147990&loc=d3e611197-123010 + Details
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