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Real Estate, net - Depreciation Expense (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2026 | Mar. 31, 2025
Real Estate [Abstract] |  |
Depreciation expense on real estate | $ 6.0 | $ 7.1

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- Definition Real Estate Investment Property, Depreciation Expense + References No definition available. + Details
Name: | brsp_RealEstateInvestmentPropertyDepreciationExpense
Namespace Prefix: | brsp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RealEstateAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration