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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - Schedule of Mortgage Loans by Property Type and Geographic Distribution (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 8,384,575	$ 8,708,214
General CECL allowance	(26,482)	(26,224)
Carrying value, net	$ 8,358,093	$ 8,681,990
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	100.00%	100.00%
Off-balance-sheet, credit loss, liability, amount excluded	$ 4,000	$ 4,300
United Kingdom
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 2,675,097	$ 2,470,532
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	31.90%	28.40%
New York City
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,736,856	$ 2,049,493
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	20.70%	23.50%
Other Europe
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,686,425	$ 1,542,462
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	20.10%	17.70%
Germany
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	7.40%	4.90%
Italy
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	4.90%	5.40%
Spain
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	4.20%	3.80%
Sweden
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	2.90%	2.80%
Ireland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	0.50%	0.70%
Netherlands
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	0.20%
Midwest
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 522,137	$ 592,756
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	6.20%	6.80%
Southeast
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 535,054	$ 642,542
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	6.40%	7.40%
West
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 484,842	$ 584,247
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	5.80%	6.70%
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 744,164	$ 826,182
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	8.90%	9.50%
Percentage of Portfolio	1.10%	0.30%
Northeast
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	5.00%	5.50%
Southwest
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	1.70%	2.30%
Mid-Atlantic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	1.10%	1.40%
Hotel
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 2,128,256	$ 2,117,079
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	25.40%	24.30%
Office
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,593,320	$ 1,671,006
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	19.00%	19.20%
Retail Site
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,407,764	$ 1,364,752
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	16.80%	15.70%
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,247,238	$ 1,537,541
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	14.90%	17.70%
Mixed Use
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 679,303	$ 559,809
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	8.10%	6.40%
Health Care
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 511,803	$ 575,144
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	6.10%	6.60%
Industrial Property
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 293,133	$ 296,860
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	3.50%	3.40%
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 523,758	$ 586,023
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	6.20%	6.70%
Parking Garage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	2.30%	3.10%
Caravan Park
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	2.40%	2.30%
Urban Predevelopment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	1.50%	1.30%

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479344/326-20-45-1

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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
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-Name Accounting Standards Codification
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