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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, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 8,329,221	$ 8,384,575
General CECL Allowance	(35,319)	(26,482)
Carrying value, net	$ 8,293,902	$ 8,358,093
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	100.00%	100.00%
General CECL allowance on unfunded commitments	$ 3,622	$ 4,017
United Kingdom
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 2,818,068	$ 2,675,097
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	33.80%	31.90%
New York City
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,597,363	$ 1,736,856
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	19.20%	20.70%
Other Europe
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,432,136	$ 1,686,425
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	17.20%	20.10%
Germany
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	7.20%	7.40%
Italy
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	3.30%	4.90%
Spain
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	3.20%	4.20%
Sweden
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	2.80%	2.90%
Ireland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	0.50%	0.50%
Netherlands
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	0.20%	0.20%
Midwest
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 506,226	$ 522,137
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	6.10%	6.20%
Southeast
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 663,096	$ 535,054
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	8.00%	6.40%
West
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 509,774	$ 484,842
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	6.10%	5.80%
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 802,558	$ 744,164
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	9.60%	8.90%
Percentage of Portfolio	1.10%	1.10%
Northeast
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	4.60%	5.00%
Southwest
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	1.70%	1.70%
Mid-Atlantic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	2.20%	1.10%
Hotel
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 2,001,033	$ 2,128,256
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	24.00%	25.40%
Office
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,692,661	$ 1,593,320
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	20.30%	19.00%
Retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,399,957	$ 1,407,764
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	16.80%	16.80%
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,205,817	$ 1,247,238
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	14.50%	14.90%
Mixed Use
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 512,937	$ 679,303
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	6.20%	8.10%
Health Care
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 500,563	$ 511,803
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	6.00%	6.10%
Industrial Property
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 278,404	$ 293,133
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	3.30%	3.50%
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 737,849	$ 523,758
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	8.90%	6.20%
Pubs
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	2.60%
Parking Garage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	2.30%	2.30%
Caravan Park
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	2.40%	2.40%
Urban Predevelopment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	1.60%	1.50%

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