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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	3 Months Ended		12 Months Ended
	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)	Nov. 30, 2020 USD ($)	Nov. 30, 2020 GBP (£)	Jan. 01, 2020 USD ($)	Dec. 31, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 6,856,509	$ 6,488,891	$ 6,535,079
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	100.00%	100.00%	100.00%
General CECL allowance	$ (36,435)	$ (58,273)	$ (38,102)
Carrying value, net	6,820,074	6,430,618	6,496,977
General CECL allowance related to unfunded commitments	3,794	$ 6,059	3,365			$ 3,365	$ 0
New York City
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 2,398,903		2,370,337
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	35.00%	36.30%
Northeast
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 100,813		103,567
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	1.50%	1.60%
United Kingdom
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,531,675		1,263,264
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	22.30%	19.30%
West
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 624,435		749,985
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	9.10%	11.50%
Southeast
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 569,104		581,301
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	8.30%	8.90%
Midwest
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 549,469		552,537
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	8.00%	8.50%
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,082,110		914,088
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	15.80%	13.90%
Office
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,803,214		$ 1,911,145
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	26.30%		29.20%
Hotel
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 1,544,248		$ 1,576,369
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	22.50%		24.10%
Residential-For-Sale, Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 674,416		$ 738,035
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	9.80%		11.30%
Residential-for-sale: inventory
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 312,063		$ 244,803
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	4.60%		3.70%
Urban Retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 787,311		$ 655,456
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	11.50%		10.00%
Carrying value, net				$ 422,700	£ 309.2
Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 414,480		$ 228,918
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	6.00%		3.50%
Healthcare
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 370,717		$ 369,676
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	5.40%		5.70%
Urban Predevelopment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 52,480		$ 298,909
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	0.80%		4.60%
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value	$ 897,580		$ 511,768
Mortgage loans on real estate, commercial and consumer, percentage of portfolio	13.10%		7.90%

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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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