Related Party Transactions (Details)		12 Months Ended
Related Party Transactions (Details)	Jan. 24, 2024	Dec. 31, 2024 USD ($) component	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Related Party Transaction [Line Items]
Debt-to-equity ratio	1.0	1.0
Management fees payable		$ 15,181,000	$ 1,066,000
Management fees		54,092,000	4,187,000	$ 3,378,000
Incentive fees on income payable		9,017,000	0
Incentive fee on income		35,951,000	7,704,000	4,720,000
Other general and administrative		6,828,000	2,073,000	1,205,000
Investment Advisory Agreement
Related Party Transaction [Line Items]
Management fees payable		$ 15,200,000	1,100,000
Investment Advisory Agreement \| Affiliated entity
Related Party Transaction [Line Items]
Number of components \| component		2
Incentive fee
Related Party Transaction [Line Items]
Incentive fees on income payable		$ 9,000,000.0	0
Incentive fees on capital gains		$ 0	0	(400,000)
Incentive fee \| Affiliated entity
Related Party Transaction [Line Items]
Number of incentive fee components \| component		2
Period from liquidity event		15 months
Incentive fee, pre-liquidity event, preferred return, quarterly \| Affiliated entity
Related Party Transaction [Line Items]
Incentive fee rate (as a percent)	1.50%	1.50%
Incentive fee, pre-liquidity event, preferred return, annualized \| Affiliated entity
Related Party Transaction [Line Items]
Incentive fee rate (as a percent)	6.00%	6.00%
Incentive fee, pre-liquidity event, pre-incentive fee net investment income below catch-up threshold \| Affiliated entity
Related Party Transaction [Line Items]
Percentage of Pre-Incentive Fee Net Investment Income	100.00%	100.00%
Incentive fee, pre-liquidity event, quarterly catch-up threshold \| Affiliated entity
Related Party Transaction [Line Items]
Incentive fee rate (as a percent)	1.8175%	1.765%
Incentive fee, pre-liquidity event, annualized catch-up threshold \| Affiliated entity
Related Party Transaction [Line Items]
Incentive fee rate (as a percent)	7.27%	7.06%
Incentive fee, pre-liquidity event, pre-incentive fee net investment income exceeds catch-up threshold \| Affiliated entity
Related Party Transaction [Line Items]
Incentive fee rate (as a percent)	17.50%	15.00%
Incentive fee, post-liquidity event, preferred return, quarterly \| Affiliated entity
Related Party Transaction [Line Items]
Incentive fee rate (as a percent)		1.50%
Incentive fee, post-liquidity event, preferred return, annualized \| Affiliated entity
Related Party Transaction [Line Items]
Incentive fee rate (as a percent)		6.00%
Incentive fee, post-liquidity event, pre-incentive fee net investment income below catch-up threshold \| Affiliated entity
Related Party Transaction [Line Items]
Incentive fee rate (as a percent)		100.00%
Incentive fee, post-liquidity event, quarterly catch-up threshold \| Affiliated entity
Related Party Transaction [Line Items]
Incentive fee rate (as a percent)		1.8175%
Incentive fee, post-liquidity event, annualized catch-up threshold \| Affiliated entity
Related Party Transaction [Line Items]
Incentive fee rate (as a percent)		7.27%
Incentive fee, post-liquidity event, pre-incentive fee net investment income exceeds catch-up threshold \| Affiliated entity
Related Party Transaction [Line Items]
Incentive fee rate (as a percent)		17.50%
Incentive fee, pre-liquidity event, capital gains \| Affiliated entity
Related Party Transaction [Line Items]
Incentive fee rate (as a percent)		15.00%
Incentive fee, post-liquidity event, capital gains \| Affiliated entity
Related Party Transaction [Line Items]
Incentive fee rate (as a percent)	17.50%	17.50%
Management fee \| Affiliated entity
Related Party Transaction [Line Items]
Management fee rate (as a percent)	1.00%	100.00%
Period from liquidity event		15 months
Management fee, pre-liquidity event \| Affiliated entity
Related Party Transaction [Line Items]
Management fee rate (as a percent)		0.50%
Management fee, post-liquidity event \| Affiliated entity
Related Party Transaction [Line Items]
Management fee rate (as a percent)	1.50%	1.50%
Management fees waived \| Affiliated entity
Related Party Transaction [Line Items]
Management fee rate (as a percent)		50.00%
Administration Agreement
Related Party Transaction [Line Items]
Accounts payable		$ 3,200,000	1,200,000
Other general and administrative		$ 3,100,000	$ 1,200,000	$ 800,000

Franklin BSP Capital Corp 10-K