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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	12 Months Ended
	Dec. 31, 2021 USD ($) Rate	Dec. 31, 2020 USD ($) Rate	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Nov. 30, 2020 USD ($)	Nov. 30, 2020 GBP (£)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 7,890,848	$ 6,535,079
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	100.00%	100.00%
General CECL allowance	$ (33,588)	$ (38,102)
Carrying value, net	7,857,260	6,496,977
General CECL Allowance on unfunded commitments	3,106	3,365	$ 2,193	$ 2,444	$ 3,794			$ 3,595	$ 4,119	$ 6,059	$ 0
United Kingdom
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 2,297,286	$ 1,263,264
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	29.10%	19.30%
New York City
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 2,000,661	$ 2,370,337
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	25.40%	36.30%
Other Europe
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,295,870	$ 635,831
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	16.40%	9.70%
Germany
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio | Rate	6.10%	3.30%
Sweden
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio | Rate	3.60%
Spain
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio | Rate	3.30%	4.20%
Italy
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio | Rate	2.60%	2.20%
Ireland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio | Rate	0.80%
Southeast
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 708,920	$ 581,301
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	9.00%	8.90%
Midwest
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 689,274	$ 552,537
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	8.70%	8.50%
West
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 356,097	$ 749,985
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	4.50%	11.50%
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 542,740	$ 381,824
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	6.90%	5.80%
Percentage of Portfolio | Rate	0.30%	0.40%
Southwest
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio | Rate	3.50%	2.80%
Northeast
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio | Rate	1.50%	1.60%
Mid-Atlantic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio | Rate	1.60%	1.00%
Hotel
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,875,439	$ 1,576,369
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	23.80%	24.10%
Office
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,700,779	$ 1,911,145
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	21.60%	29.20%
Residential-for-sale
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 956,617	$ 982,838
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	12.10%	15.00%
Urban Retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 711,592	$ 655,456
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	9.00%	10.00%
Carrying value, net						$ 422,700	£ 309.2
Residential-for-rent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 477,569	$ 189,260
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	6.10%	2.90%
Retail Center
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 414,740	$ 105,344
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	5.30%	1.60%
Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 377,068	$ 228,918
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	4.80%	3.50%
Healthcare
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 316,321	$ 369,676
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	4.00%	5.70%
Mixed Use
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 269,839	$ 217,164
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	3.40%	3.30%
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 790,884	$ 298,909
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	9.90%	4.70%
Parking Garage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio | Rate	3.30%
Caravan Park
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio | Rate	2.80%
Urban Predevelopment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio | Rate	1.60%	4.70%
Multifamily Portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Portfolio | Rate	2.20%

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The reserve to cover probable credit losses related to specifically identified fixed maturity real estate loans as well as probable credit losses inherent in the remainder of that loan portfolio.

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