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Commercial Mortgage, Subordinate Loans and Other Lending Assets, Net - Additional Information (Details) £ in Millions		1 Months Ended		3 Months Ended					6 Months Ended		12 Months Ended
		Jan. 31, 2020 USD ($)	Jan. 31, 2020 GBP (£)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2020 GBP (£)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Jun. 30, 2021 GBP (£)	Nov. 30, 2020 USD ($)	Nov. 30, 2020 GBP (£)
Financing Receivable, Allowance for Credit Loss [Line Items]
Mortgage loans on real estate, commercial and consumer, percentage of portfolio									100.00%	100.00%	100.00%
Interest receivable				$ 39,411,000					$ 39,411,000		$ 40,559,000
Amortized cost of loans in cost recovery				397,200,000		$ 373,500,000			397,200,000	$ 373,500,000
Interest received for loans in cost recovery				400,000		600,000			800,000	1,200,000
Total carrying value, net				7,520,105,000		6,496,977,000			7,520,105,000	6,496,977,000	6,496,977,000
Principal balance				7,558,304,000		6,535,079,000			7,558,304,000	6,535,079,000	6,535,079,000
Increase in general CECL allowance				400,000
Payment in kind interest				13,700,000		12,400,000			30,600,000	24,800,000
Proceeds from pre-payment penalties or accelerated fees				700,000		0			700,000	200,000
Past Due 90
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost of loans in cost recovery				751,500,000					$ 751,500,000		711,900,000
Past Due 30-59
Financing Receivable, Allowance for Credit Loss [Line Items]
Principal balance											$ 19,000,000.0
Urban Retail
Financing Receivable, Allowance for Credit Loss [Line Items]
Mortgage loans on real estate, commercial and consumer, percentage of portfolio									10.90%		10.00%
Total carrying value, net													$ 422,700,000	£ 309.2
Principal balance				820,466,000					$ 820,466,000		$ 655,456,000
Sale of Mezzanine Loan
Financing Receivable, Allowance for Credit Loss [Line Items]
Proceeds from sale of loan		$ 81,300,000	£ 62.2				$ 81,300,000	£ 62.2
Realized loss on investment							0
Sale Of Mezzanine Loan Two
Financing Receivable, Allowance for Credit Loss [Line Items]
Realized loss on investment							0
Sale of Unfunded Commitment of Senior Mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
Proceeds from sale of loan		$ 65,300,000	£ 50.0				$ 65,300,000	£ 50.0
Sale of Construction Loan Interests
Financing Receivable, Allowance for Credit Loss [Line Items]
Commitments sold						376,900,000
Funded amount of interests sold						127,000,000.0
Gain (loss) on loan interests sold						$ 1,400,000
Commercial Mortgage and Subordinated Portfolio Segment
Financing Receivable, Allowance for Credit Loss [Line Items]
Total carrying value, net				146,500,000					146,500,000		136,100,000
Principal balance				7,558,304,000					7,558,304,000		6,535,079,000
Realized loss on investment									(20,000,000)
Commercial Mortgage and Subordinated Portfolio Segment | Urban Retail
Financing Receivable, Allowance for Credit Loss [Line Items]
Total carrying value, net				354,200,000					354,200,000			£ 256.1	$ 338,400,000	£ 247.5
Subordinate Mortgage Portfolio Segment
Financing Receivable, Allowance for Credit Loss [Line Items]
Total carrying value, net	[1]			866,908,000					866,908,000		$ 1,045,893,000
Payment in kind interest					$ 800,000					$ 0
Maximum exposure to loss				$ 68,300,000					$ 68,300,000
Maximum exposure to loss, term									5 years 3 months 18 days
Floating Rate Loan
Financing Receivable, Allowance for Credit Loss [Line Items]
Mortgage loans on real estate, commercial and consumer, percentage of portfolio									97.00%		95.00%
[1] Net of $183,199 and $213,102 CECL Allowances in 2021 and 2020, respectively, comprised of $145,000 and $175,000 Specific CECL Allowance and $38,199 and $38,102 General CECL Allowance, respectively.

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