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Summary of Significant Accounting Policies - Summary of Properties (Details)
ft² in Thousands, $ in Thousands
Jun. 30, 2023
USD ($)
ft²
Dec. 31, 2022
USD ($)
 [2]
Property, Plant and Equipment [Line Items]    
Investments at fair value $ 3,179,465 [1] $ 3,221,247
New Mountain Net Lease Corporation    
Property, Plant and Equipment [Line Items]    
Fair Value 120,342  
New Mountain Net Lease Corporation | NM NL Holdings LP / NM GP Holdco LLC    
Property, Plant and Equipment [Line Items]    
Fair Value $ 96,813  
New Mountain Net Lease Corporation | NM CLFX LP    
Property, Plant and Equipment [Line Items]    
Total Square Feet | ft² 423  
Fair Value $ 14,065  
New Mountain Net Lease Corporation | NM YI, LLC    
Property, Plant and Equipment [Line Items]    
Total Square Feet | ft² 212  
Fair Value $ 9,464  
New Mountain Net Lease Corporation | NM APP Canada Corp    
Property, Plant and Equipment [Line Items]    
Fair Value $ 7  
[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.