v3.25.2
Cover
Jun. 30, 2025
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Jun. 30, 2025
Entity File Number 814-01360
Entity Registrant Name Franklin BSP Capital Corporation
Entity Central Index Key 0001825248
Entity Tax Identification Number 85-2950084
Entity Incorporation, State or Country Code DE
Entity Address, Address Line One One Madison Avenue
Entity Address, Address Line Two Suite 1600 
Entity Address, City or Town New York
Entity Address, State or Province NY
Entity Address, Postal Zip Code 10010
City Area Code 212
Local Phone Number 588-6770
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company true
Elected Not To Use the Extended Transition Period true