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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	9 Months Ended	12 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 8,342,902	$ 7,134,992
General CECL Allowance	(39,257)	(30,836)
Mortgage Loans on Real Estate, Commercial and Consumer, Net, Total	$ 8,303,645	$ 7,104,156
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	100.00%	100.00%
General CECL allowance on unfunded commitments	$ 5,782	$ 5,948
United Kingdom
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 2,548,921	$ 2,423,856
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	30.50%	33.90%
New York City
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,412,227	$ 1,539,995
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	16.90%	21.60%
Other Europe
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,175,077	$ 1,265,344
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	14.10%	17.70%
Germany
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	8.30%	8.40%
Italy
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	2.30%	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	3.20%	3.10%
Netherlands
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	0.30%	0.30%
Southeast
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 888,876	$ 511,742
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	10.70%	7.20%
West
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 807,665	$ 489,008
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	9.70%	6.90%
Midwest
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 751,192	$ 560,436
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	9.00%	7.90%
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 758,944	$ 344,611
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	9.10%	4.80%
Percentage of Portfolio	1.20%	1.30%
Northeast
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	3.40%	0.60%
Southwest
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	3.10%	1.50%
Mid-Atlantic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	1.40%	1.40%
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 2,545,682	$ 1,556,819
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	30.50%	21.80%
Office
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 2,040,028	$ 1,756,965
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	24.50%	24.60%
Hotel
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,459,879	$ 1,575,270
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	17.50%	22.10%
Industrial Property
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 832,824	$ 399,546
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	10.00%	5.60%
Data Centers
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 445,539
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	5.30%	0.00%
Retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 359,497	$ 946,017
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	4.30%	13.30%
Mixed Use
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 304,376	$ 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	$ 355,077	$ 537,164
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	4.30%	7.50%
Pubs
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	2.70%	2.90%
Caravan Park
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio		2.70%
Urban Predevelopment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio	1.60%	1.90%

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