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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - Schedule of Mortgage Loans by Property Type and Geographic Distribution (Parenthetical) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
General allowance for credit loss liability on unfunded	$ 5.9	$ 4.0	$ 4.3
Germany
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	8.40%	7.40%
Italy
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	2.40%	4.90%
Spain
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	3.50%	4.20%
Sweden
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	3.10%	2.90%
Ireland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio		0.50%
Netherlands
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	0.30%	0.20%
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	1.30%	1.10%
Northeast
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	0.60%	5.00%
Southwest
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	1.50%	1.70%
Mid-Atlantic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	1.40%	1.10%
Residential-for-Sale
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	5.50%	8.10%
Senior Care Facilities
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	4.70%	1.90%
Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	4.70%	2.10%
Student Housing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	4.60%	2.70%
Vacation Rentals
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	2.30%	2.00%
Pubs
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	2.90%
Parking Garage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio		2.30%
Caravan Park
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	2.70%	2.40%
Urban Predevelopment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	1.90%	1.50%

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 20
-Name Accounting Standards Codification
-Section 40
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481628/310-20-40-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-2

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