v3.26.1
COVER - shares
 3 Months Ended
Mar. 31, 2026
May 08, 2026
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2026  
Document Transition Report false  
Entity File Number 814-00995  
Entity Registrant Name Carlyle Secured Lending, Inc.  
Entity Incorporation, State or Country Code MD  
Entity Tax Identification Number 80-0789789  
Entity Address, Address Line One One Vanderbilt Avenue,  
Entity Address, Address Line Two Suite 3400,  
Entity Address, City or Town New York,  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 10017  
City Area Code 212  
Local Phone Number 813-4900  
Title of 12(b) Security Common stock, $0.01 par value  
Trading Symbol CGBD  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   69,497,128
Entity Central Index Key 0001544206  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q1  
Amendment Flag false  
Current Fiscal Year End Date --12-31