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Consolidated Statements of Changes in Net Assets - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Increase (decrease) in net assets resulting from operations:    
Net investment income $ 37,554 $ 38,388
Net realized (losses) gains on investments and foreign currency (11,827) 677
Net change in unrealized appreciation of investments and foreign currency 2,994 5,878
Provision for taxes (637) (131)
Net increase in net assets resulting from operations 28,084 44,812
Capital transactions    
Offering costs (81) (56)
Distributions declared to stockholders from net investment income (38,462) (32,453)
Beginning of the period 1,331,723 1,326,191
Ending of the period $ 1,369,183 $ 1,338,494
Capital share activity    
Shares sold (in shares) 3,730,434 0
Net increase in shares outstanding (in shares) 3,730,434 0
Non-Controlling Interest in NMNLC    
Increase (decrease) in net assets resulting from operations:    
Net increase in net assets resulting from operations $ 676 $ 239
Capital transactions    
Distributions declared to stockholders from net investment income (197) (153)
Beginning of the period 11,772 11,718
Ending of the period 12,251 11,804
New Mountain Finance Corporation    
Increase (decrease) in net assets resulting from operations:    
Net increase in net assets resulting from operations 27,408 44,573
Capital transactions    
Net proceeds from shares sold 47,919 0
Offering costs (81) (56)
Distributions declared to stockholders from net investment income (38,265) (32,300)
Total net increase (decrease) in net assets resulting from capital transactions 9,573 (32,356)
Net increase in net assets 36,981 12,217
Beginning of the period 1,319,951 1,314,473
Ending of the period $ 1,356,932 $ 1,326,690