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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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- Definition

Aggregate specific allowance credit loss.

+ References

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- Definition

General allowance for credit loss increase decrease.

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- Definition

Specific allowance for credit loss increase decrease.

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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph c
-Publisher SEC

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

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