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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - CECL Allowance as Percentage of Amortized Cost and Total Commitment (Parenthetical) (Details) - Commercial Mortgage and Subordinated Portfolio Segment - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
General CECL allowance increased | $ 4.0 | $ 5.7
Aggregate specific CECL allowance |  | 268.0
Junior Mezzanine A Loan |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Specific CECL allowance increased |  | $ 142.0

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