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Investments - Selected Balance Sheet Information for SLP III and SLP IV (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Investments, cost $ 3,062,321 [1] $ 3,101,924 [2]
Investments at fair value 2,943,619 [1] 3,091,024 [2]
Total assets 3,088,909 3,246,701
Deferred financing costs, accumulated amortization 48,017 63,971
Deferred financing costs (net of accumulated amortization) (19,698) (24,191)
Payable for unsettled securities purchased 10,412 0
Total liabilities 1,826,243 1,887,410
Total liabilities and net assets 3,088,909 3,246,701
SLP III    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Investments, cost 768,974 716,654
Investments at fair value 757,977 715,096
Cash and other assets 36,293 20,988
Receivable from unsettled securities sold 7,852 9,652
Total assets 802,122 745,736
Deferred financing costs, accumulated amortization 7,524 6,515
Deferred financing costs (net of accumulated amortization) (4,681) (3,692)
Payable for unsettled securities purchased 82,498 27,428
Distribution payable 7,000 7,625
Other liabilities 7,325 7,493
Total liabilities 616,842 550,054
Members' capital 185,280 195,682
Total liabilities and net assets 802,122 745,736
SLP III | Revolving Credit Facility    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Credit facility 524,700 511,200
SLP IV    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Investments, cost 537,430 474,738
Investments at fair value 525,343 469,326
Cash and other assets 24,345 15,401
Receivable from unsettled securities sold 4,706 7,232
Total assets 554,394 491,959
Deferred financing costs, accumulated amortization 3,592 2,616
Deferred financing costs (net of accumulated amortization) (4,824) (3,088)
Payable for unsettled securities purchased 39,154 13,485
Distribution payable 4,826 5,184
Other liabilities 6,061 6,090
Total liabilities 425,954 356,108
Members' capital 128,440 135,851
Total liabilities and net assets 554,394 491,959
SLP IV | Revolving Credit Facility    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Credit facility $ 380,737 $ 334,437
[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.