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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
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Jun. 30, 2025 | Mar. 31, 2025 | Jun. 30, 2024 | Mar. 31, 2024
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
General CECL allowance increased | $ 3.1 | $ 4.0 | $ 2.8 | $ 5.7
Specific CECL allowance increased |  |  | $ 7.5 |
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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