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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, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 8,663,758	$ 7,134,992
General CECL Allowance	(38,848)	(30,836)
Mortgage Loans on Real Estate, Commercial and Consumer, Net, Total	$ 8,624,910	$ 7,104,156
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	100.00%	100.00%
General CECL allowance on unfunded commitments	$ 5,057	$ 5,948
United Kingdom
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 3,140,487	$ 2,423,856
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	36.20%	33.90%
New York City
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,497,147	$ 1,539,995
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	17.30%	21.60%
Other Europe
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,157,797	$ 1,265,344
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	13.30%	17.70%
Germany
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	7.90%	8.40%
Italy
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	2.20%	2.40%
Spain
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio		3.50%
Sweden
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	3.00%	3.10%
Netherlands
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	0.20%	0.30%
West
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 899,484	$ 489,008
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	10.40%	6.90%
Southeast
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 804,340	$ 511,742
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	9.30%	7.20%
Midwest
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 559,857	$ 560,436
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	6.50%	7.90%
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 604,646	$ 344,611
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	7.00%	4.80%
Percentage of Portfolio	1.10%	1.30%
Northeast
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	3.30%	0.60%
Southwest
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	1.30%	1.50%
Mid-Atlantic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	1.30%	1.40%
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 2,126,799	$ 1,556,819
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	24.60%	21.80%
Office
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 2,027,872	$ 1,756,965
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	23.50%	24.60%
Hotel
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,371,199	$ 1,575,270
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	15.80%	22.10%
Retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,190,400	$ 946,017
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	13.70%	13.30%
Industrial Property
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,057,883	$ 399,546
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	12.20%	5.60%
Mixed Use
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 313,526	$ 363,211
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	3.60%	5.10%
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 576,079	$ 537,164
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	6.60%	7.50%
Pubs
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	2.60%	2.90%
Caravan Park
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	2.40%	2.70%
Urban Predevelopment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	1.60%	1.90%

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