XML 68 R53.htm IDEA: XBRL DOCUMENT
v3.24.1.u1

Net Assets - Schedule of Shares Issued and Proceeds Received (Details) | 3 Months Ended
--- | ---
Mar. 31, 2024 USD ($) equity_distribution_agreement $ / shares shares | Mar. 31, 2023 USD ($) shares
Subsidiary, Sale of Stock [Line Items] |  |
Number of agreements | equity_distribution_agreement | 6 |
Aggregate sales price | $ 500,000,000 |
Remaining available for issuance | 500,000,000 |
Net Proceeds | $ 161,998,000 | $ 0
At-the-Market Offering, Offering |  |
Subsidiary, Sale of Stock [Line Items] |  |
Shares issued (in shares) | shares | 5,885,546 | 0
Gross Proceeds | $ 162,726,000 |
Placement Fees/Offering Expenses | 704,000 |
Net Proceeds | $ 162,022,000 |
Offering price per share (in usd per share) | $ / shares | $ 27.53 |

X
- Definition Number Of Equity Distribution Agreements + References No definition available. + Details
Name: | bxsl_NumberOfEquityDistributionAgreements
Namespace Prefix: | bxsl_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Sale of Stock, Number of Shares Issued in Transaction, Value + References No definition available. + Details
Name: | bxsl_SaleOfStockNumberOfSharesIssuedInTransactionValue
Namespace Prefix: | bxsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Sale of Stock, Remaining Authorized Amount + References No definition available. + Details
Name: | bxsl_SaleOfStockRemainingAuthorizedAmount
Namespace Prefix: | bxsl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The cash outflow for cost incurred directly with the issuance of an equity security. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-15 + Details
Name: | us-gaap_PaymentsOfStockIssuanceCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 14 -Subparagraph (a) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-14 + Details
Name: | us-gaap_ProceedsFromIssuanceOfCommonStock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Cash received on stock transaction after deduction of issuance costs. + References No definition available. + Details
Name: | us-gaap_SaleOfStockConsiderationReceivedOnTransaction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The number of shares issued or sold by the subsidiary or equity method investee per stock transaction. + References No definition available. + Details
Name: | us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction. + References No definition available. + Details
Name: | us-gaap_SaleOfStockPricePerShare
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- 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
Name: | us-gaap_SubsidiarySaleOfStockLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=bxsl_AtTheMarketOfferingOffering1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |