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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) $ in Thousands, £ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2022 USD ($) Rate	Dec. 31, 2021 USD ($) Rate	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Nov. 30, 2020 USD ($)	Nov. 30, 2020 GBP (£)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 8,371,419	$ 7,890,848
General CECL allowance	(21,377)	(33,588)
Carrying value, net	$ 8,350,042	$ 7,857,260
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	100.00%	100.00%
General CECL Allowance on unfunded commitments	$ 3,928	$ 3,106	$ 3,794	$ 3,365
New York City
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 2,295,383	$ 2,000,661
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	27.40%	25.40%
United Kingdom
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,989,250	$ 2,297,286
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	23.80%	29.10%
Other Europe
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,494,435	$ 1,295,870
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	17.90%	16.40%
Germany
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio | Rate	5.60%	6.10%
Italy
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio | Rate	430.00%	2.60%
Spain
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio | Rate	3.90%	3.30%
Sweden
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio | Rate	330.00%	3.60%
Ireland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio | Rate	0.80%	0.80%
Southeast
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 769,205	$ 708,920
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	9.20%	9.00%
Midwest
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 681,237	$ 689,274
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	8.10%	8.70%
West
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 341,569	$ 356,097
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	4.10%	4.50%
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 800,340	$ 542,740
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	9.50%	6.90%
Percentage of Portfolio | Rate	0.30%	0.30%
Northeast
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio | Rate	5.90%	1.50%
Southwest
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio | Rate	1.90%	3.50%
Mid-Atlantic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio | Rate	1.40%	1.60%
Office
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,980,780	$ 1,700,779
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	23.70%	21.60%
Hotel
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,949,106	$ 1,875,439
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	23.30%	23.80%
Residential-For-Sale, Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 896,714	$ 956,617
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	10.70%	12.10%
Health Care
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 637,570	$ 316,321
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	7.60%	4.00%
Retail Center
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 508,117	$ 414,740
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	6.10%	5.30%
Residential-for-rent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 470,861	$ 477,569
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	5.60%	6.10%
Mixed Use
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 417,967	$ 269,839
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	5.00%	3.40%
Industrial Property
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 358,221	$ 377,068
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	4.40%	4.80%
Urban Retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 364,953	$ 711,592
Carrying value, net					$ 422,700	£ 309.2
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	4.30%	9.00%
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 787,130	$ 790,884
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	9.30%	9.90%
Parking Garage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio | Rate	310.00%	3.30%
Caravan Park
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio | Rate	260.00%	2.80%
Multifamily Development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio | Rate	210.00%	2.20%
Urban Predevelopment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio | Rate	150.00%	1.60%

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