Debt Instrument, Credit Spread Adjustment

No definition available.

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- Definition

Debt Instrument, Ownership Percentage For Immediate Conversion

+ References

No definition available.

+ Details

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Namespace Prefix:	bbdc_
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Period Type:	instant

- Definition

Debt Instrument, Variable Interest Rate, Floor

+ References

No definition available.

+ Details

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Namespace Prefix:	bbdc_
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Balance Type:	na
Period Type:	duration

- Definition

Line of credit facility, accordion feature, increase limit, subject to certain conditions by obtaining additional commitments from existing and/or new lenders.

+ References

No definition available.

+ Details

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Namespace Prefix:	bbdc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line Of Credit Facility, Unused Capacity, Less Than Two-Thirds Of Commitment Fee Percentage

+ References

No definition available.

+ Details

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- Definition

Line of Credit Interest Rate Increase

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

Line Of Credit, Interest Rate Step Up To Increase Pursuant To Debt To Total Assets Threshold

+ References

No definition available.

+ Details

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (a)
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+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
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-Subparagraph (SX 210.5-02.22(a)(1))
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+ Details

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph e
-URI https://asc.fasb.org/extlink&oid=123599511&loc=d3e64711-112823

+ Details

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Period Type:	duration

- Definition

Amount, before accumulated amortization, of debt issuance costs related to line of credit arrangements. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

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-Name Accounting Standards Codification
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Period Type:	instant

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

The cash outflow for a long-term debt where the holder has highest claim on the entity's asset in case of bankruptcy or liquidation during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3291-108585

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Balance Type:	credit
Period Type:	duration

Borrowings - Additional information (Details) € in Millions, £ in Millions, kr in Millions, $ in Millions			1 Months Ended		12 Months Ended
	Nov. 23, 2021 USD ($)	May 09, 2019 USD ($)	Feb. 28, 2019 USD ($)	Aug. 31, 2018 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2022 SEK (kr)	Dec. 31, 2022 GBP (£)	Dec. 31, 2022 EUR (€)	Apr. 30, 2022 USD ($)	Apr. 01, 2022 USD ($)	Feb. 25, 2022 USD ($)	Dec. 31, 2021 SEK (kr)	Dec. 31, 2021 GBP (£)	Dec. 31, 2021 EUR (€)	Dec. 31, 2021 AUD ($)	Nov. 04, 2021 USD ($)	Feb. 25, 2021 USD ($)	Nov. 04, 2020 USD ($)	Sep. 29, 2020 USD ($)	Sep. 24, 2020 USD ($)	Aug. 03, 2020 USD ($)	Jun. 26, 2020 USD ($)	Apr. 23, 2020 USD ($)	Jan. 21, 2020 USD ($)	Oct. 29, 2019 USD ($)	Aug. 14, 2019 USD ($)	Jun. 18, 2019 USD ($)	May 19, 2019 USD ($)
Debt Instrument [Line Items]
Borrowings under credit facilities					$ 729,144,000	$ 655,189,000
Aggregate principal amount					0	0	$ 95,472,000
February 2019 Credit Facility \| Line of Credit
Debt Instrument [Line Items]
Commitment aggregate amount			$ 800,000,000		$ 1,100,000,000								$ 1,100,000,000	$ 965,000,000					$ 875,000,000
Line of credit facility commitment aggregate value			$ 1,200,000,000										$ 1,500,000,000	$ 1,500,000,000
Debt instrument, basis spread on variable floor rate (as percent)			1.00%
Percentage of unused portion of credit facility, greater than two-third of commitments (as percent)			0.50%
Percentage of unused portion of credit facility, less than two-third of commitments (as percent)			0.375%
Debt issuance costs, financing fees			$ 6,400,000									$ 1,700,000
Effective interest rate					5.619%				5.619%	5.619%	5.619%
February 2019 Credit Facility \| Line of Credit \| Interest Period Of One Month
Debt Instrument [Line Items]
Debt instrument, credit spread adjustment			0.0010
February 2019 Credit Facility \| Line of Credit \| Interest Period Of Three Month
Debt Instrument [Line Items]
Debt instrument, credit spread adjustment			0.0015
February 2019 Credit Facility \| Line of Credit \| Interest Period Of Six Month
Debt Instrument [Line Items]
Debt instrument, credit spread adjustment			0.0025
February 2019 Credit Facility \| Level 3 \| Line of Credit
Debt Instrument [Line Items]
Fair value of long-term debt					$ 729,100,000	655,200,000
February 2019 Credit Facility \| Base Rate \| Line of Credit
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			1.25%
February 2019 Credit Facility \| Base Rate \| Line of Credit \| External Credit Rating, Investment Grade
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			1.00%
February 2019 Credit Facility \| SOFR \| Line of Credit
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			2.25%
February 2019 Credit Facility \| SOFR \| Line of Credit \| External Credit Rating, Investment Grade
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			2.00%
February 2019 Credit Facility \| Federal Funds Purchased \| Line of Credit
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			0.50%
February 2019 Credit Facility \| Overnight Bank Funding Rate \| Line of Credit
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			0.50%
February 2019 Credit Facility \| One-Month Secured Overnight Financing Rate (SOFR) \| Line of Credit
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			1.00%
Debt instrument, credit spread adjustment			0.0010
February 2019 Credit Facility \| Applicable Rate \| Line of Credit
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			2.00%
February 2019 Credit Facility \| Applicable Rate \| Line of Credit \| External Credit Rating, Non Investment Grade
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			2.25%
February 2019 Credit Facility \| Screen Rate \| Line of Credit
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			2.20%
February 2019 Credit Facility \| Screen Rate \| Line of Credit \| External Credit Rating, Non Investment Grade
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			2.45%
Debt Denominated In U.S Dollars \| Line of Credit
Debt Instrument [Line Items]
Borrowings under credit facilities					$ 497,500,000	$ 377,000,000
Effective interest rate					6.324%	2.125%			6.324%	6.324%	6.324%				2.125%	2.125%	2.125%	2.125%
Debt Denominated In U.S Dollars \| One-Month Secured Overnight Financing Rate (SOFR) \| Line of Credit
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate					4.224%
Debt Denominated In U.S Dollars \| LIBOR \| Line of Credit
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate						0.125%
Debt Denominated In Swedish Kronas \| Line of Credit
Debt Instrument [Line Items]
Borrowings under credit facilities					$ 1,200,000	$ 1,400,000			kr 12.8						kr 12.8
Effective interest rate					4.375%	2.00%			4.375%	4.375%	4.375%				2.00%	2.00%	2.00%	2.00%
Debt Denominated In Swedish Kronas \| Stockholm Interbank Offered Rate (STIBOR) \| Line of Credit
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate					2.375%	0.00%
Debt Denominated In British Pounds \| Line of Credit
Debt Instrument [Line Items]
Borrowings under credit facilities					$ 82,500,000	$ 92,500,000				£ 68.6						£ 68.3
Effective interest rate					4.96%	2.125%			4.96%	4.96%	4.96%				2.125%	2.125%	2.125%	2.125%
Debt Denominated In British Pounds \| Sterling Overnight Index Average (SONIA) \| Line of Credit
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate					2.96%
Debt Denominated In British Pounds \| GBP LIBOR \| Line of Credit
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate						0.125%
Debt Denominated In Euro \| Line of Credit
Debt Instrument [Line Items]
Borrowings under credit facilities					$ 147,900,000	$ 157,600,000					€ 138.6						€ 138.6
Effective interest rate					3.625%	2.00%			3.625%	3.625%	3.625%				2.00%	2.00%	2.00%	2.00%
Debt Denominated In Euro \| Euro Interbank Offered Rate (EURIBOR) \| Line of Credit
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate					1.625%	0.00%
Debt Denominated In Australia Dollars \| Line of Credit
Debt Instrument [Line Items]
Borrowings under credit facilities						$ 26,600,000												$ 36.6
Effective interest rate						2.25%									2.25%	2.25%	2.25%	2.25%
Debt Denominated In Australia Dollars \| AUD Screen Rate \| Line of Credit
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate						0.25%
September 24, 2020 - August 2025 Notes \| Notes
Debt Instrument [Line Items]
Aggregate principal amount																						$ 25,000,000	$ 25,000,000	$ 50,000,000
Fixed interest rate					4.66%				4.66%	4.66%	4.66%													4.66%
Ownership percent for immediate conversion					66.67%				66.67%	66.67%	66.67%
September 24, 2020 - August 2025 Notes \| Level 3 \| Notes
Debt Instrument [Line Items]
Fair value of long-term debt					$ 46,100,000	$ 52,200,000
November 5, 2020 - Series B Notes \| Notes
Debt Instrument [Line Items]
Aggregate principal amount																					$ 62,500,000
Fixed interest rate					4.25%				4.25%	4.25%	4.25%										4.25%
November 5, 2020 - Series B Notes \| Level 3 \| Notes
Debt Instrument [Line Items]
Fair value of long-term debt					$ 56,800,000	64,100,000
November 5, 2020 - Series C Notes \| Notes
Debt Instrument [Line Items]
Aggregate principal amount																					$ 112,500,000
Fixed interest rate					4.75%				4.75%	4.75%	4.75%										4.75%
November 5, 2020 - Series C Notes \| Level 3 \| Notes
Debt Instrument [Line Items]
Fair value of long-term debt					$ 97,700,000	115,300,000
Series B And Series C Senior Unsecured Notes Due November \| Notes
Debt Instrument [Line Items]
Interest rate extended																					0.0075
Investment grade conditions																					0.0150
February 25, 2021 Series D Notes \| Notes
Debt Instrument [Line Items]
Aggregate principal amount																				$ 80,000,000
Fixed interest rate					3.41%				3.41%	3.41%	3.41%									3.41%
February 25, 2021 Series D Notes \| Level 3 \| Notes
Debt Instrument [Line Items]
Fair value of long-term debt					$ 69,600,000	79,200,000
February 25, 2021 Series E Notes \| Notes
Debt Instrument [Line Items]
Aggregate principal amount																				$ 70,000,000
Fixed interest rate					4.06%				4.06%	4.06%	4.06%									4.06%
February 25, 2021 Series E Notes \| Level 3 \| Notes
Debt Instrument [Line Items]
Fair value of long-term debt					$ 57,800,000	68,700,000
Series D And Series E Senior Unsecured Notes Due February \| Notes
Debt Instrument [Line Items]
Interest rate extended																				0.0075
Investment grade conditions																				0.0150
November 23, 2021 - November 2026 Notes \| Notes
Debt Instrument [Line Items]
Aggregate principal amount	$ 350,000,000
Fixed interest rate	3.30%				3.30%				3.30%	3.30%	3.30%
Redemption percentage on purchase price (as percent)	100.00%
Ownership percent for immediate conversion					66.67%				66.67%	66.67%	66.67%
November 23, 2021 - November 2026 Notes \| Level 3 \| Notes
Debt Instrument [Line Items]
Fair value of long-term debt					$ 294,600,000	$ 346,800,000
August 2018 Credit facility \| Line of Credit
Debt Instrument [Line Items]
Commitment aggregate amount		$ 300,000,000	$ 600,000,000	$ 750,000,000
August 2018 Credit facility \| Federal Funds Purchased \| Line of Credit
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate				0.50%
August 2018 Credit facility \| LIBOR \| Line of Credit
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate				1.00%
August 2018 Credit Facility, Class A Loan Commitment \| Line of Credit
Debt Instrument [Line Items]
Commitment aggregate amount			$ 100,000,000	$ 250,000,000																											$ 0
August 2018 Credit Facility, Class A-1 Loan Commitments \| Line of Credit
Debt Instrument [Line Items]
Commitment aggregate amount		300,000,000		$ 500,000,000																					$ 0	$ 30,000,000	$ 80,000,000	$ 150,000,000	$ 177,000,000	$ 250,000,000	$ 300,000,000
Debt Securitization \| Secured Debt
Debt Instrument [Line Items]
Aggregate principal amount		$ 449,300,000
Class - A - 1 Senior Secured Floating Rate 2019 Notes \| Notes
Debt Instrument [Line Items]
Aggregate principal amount								$ 30,000,000
Class - A - 1 Senior Secured Floating Rate 2019 Notes \| Secured Debt
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		1.02%
Aggregate principal amount		$ 296,800,000
Class - A - 2 Senior Secured Floating Rate 2019 Notes \| Secured Debt
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		1.65%
Aggregate principal amount		$ 51,500,000
Subordinated 2019 Notes \| Secured Debt
Debt Instrument [Line Items]
Aggregate principal amount		$ 101,000,000