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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	6 Months Ended	12 Months Ended
	Jun. 30, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 8,327,704	$ 8,708,214
General CECL allowance	(32,276)	(26,224)
Carrying value, net	$ 8,295,428	$ 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	$ 4,800	$ 4,300
United Kingdom
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 2,560,347	$ 2,470,532
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	30.70%	28.40%
New York City
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,846,163	$ 2,049,493
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	22.20%	23.50%
Other Europe
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,438,559	$ 1,542,462
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	17.30%	17.70%
Germany
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	5.10%	4.90%
Italy
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	470.00%	5.40%
Spain
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	4.10%	3.80%
Sweden
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	290.00%	2.80%
Ireland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	0.50%	0.70%
Midwest
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 549,837	$ 592,756
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	6.60%	6.80%
Southeast
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 556,861	$ 642,542
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	6.70%	7.40%
West
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 599,460	$ 584,247
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	7.20%	6.70%
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 776,477	$ 826,182
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	9.30%	9.50%
Percentage of Portfolio	80.00%	0.30%
Northeast
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	550.00%	5.50%
Southwest
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	180.00%	2.30%
Mid-Atlantic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	120.00%	1.40%
Hotel
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,938,822	$ 2,117,079
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	23.30%	24.30%
Office
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,524,162	$ 1,671,006
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	18.30%	19.20%
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,405,857	$ 1,537,541
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	16.90%	17.70%
Retail Site
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,414,041	$ 1,364,752
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	17.00%	15.70%
Health Care
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 569,557	$ 575,144
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	6.80%	6.60%
Mixed Use
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 638,577	$ 559,809
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	7.70%	6.40%
Industrial Property
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 288,093	$ 296,860
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	3.40%	3.40%
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 548,595	$ 586,023
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	6.60%	6.70%
Parking Garage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	260.00%	3.10%
Urban Predevelopment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	150.00%	1.30%
Caravan Park
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	250.00%	2.30%

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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
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-URI https://asc.fasb.org//1943274/2147479344/326-20-45-1

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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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