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Commercial Mortgage, Subordinate Loans and Other Lending Assets, Net - Schedule of Mortgage Loans by Property Type and Geographic Distribution (Details) $ in Thousands, £ in Millions	6 Months Ended		12 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Mar. 31, 2021 USD ($)	Nov. 30, 2020 USD ($)	Nov. 30, 2020 GBP (£)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 7,558,304	$ 6,535,079	$ 6,535,079
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	100.00%	100.00%	100.00%
General CECL allowance	$ (38,199)	$ (38,102)	$ (38,102)
Carrying value, net	7,520,105	6,496,977	6,496,977
General CECL Allowance on unfunded commitments	2,444	$ 4,119	3,365	$ 3,794			$ 6,059	$ 0
New York City
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 2,355,270		$ 2,370,337
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	31.20%		36.30%
United Kingdom
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,637,480		$ 1,263,264
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	21.70%		19.30%
Midwest
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 737,492		$ 552,537
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	9.80%		8.50%
Southeast
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 655,490		$ 581,301
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	8.70%		8.90%
West
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 552,475		$ 749,985
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	7.30%		11.50%
Northeast
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 138,952		$ 103,567
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	1.80%		1.60%
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,481,145		$ 914,088
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	19.50%		13.90%
Office
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,969,597		$ 1,911,145
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	26.10%		29.20%
Hotel
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,520,275		$ 1,576,369
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	20.10%		24.10%
Residential-for-sale
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 835,187		$ 982,838
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	11.00%		15.00%
Urban Retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 820,466		$ 655,456
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	10.90%		10.00%
Carrying value, net					$ 422,700	£ 309.2
Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 672,537		$ 228,918
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	8.90%		3.50%
Mixed Use
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 238,702		$ 217,160
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	3.20%		3.30%
Healthcare
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 367,120		$ 369,676
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	4.90%		5.70%
Urban Predevelopment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 52,520		$ 298,909
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	0.70%		4.60%
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,081,900		$ 294,608
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	14.20%		4.60%

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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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