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Commercial Mortgage, Subordinate Loans and Other Lending Assets, Net - Cost Recovery Loans (Details)		3 Months Ended		6 Months Ended
	May 24, 2021 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]
Specific CECL allowance		$ 145,000,000		$ 145,000,000			$ 175,000,000
Amortized cost		397,200,000	$ 373,500,000	397,200,000	$ 373,500,000
Specific CECL Allowance	$ (10,000,000.0)	30,000,000	9,500,000	30,000,000	(140,500,000)
Specific CECL allowance (reversal), net of previously recorded amount		20,000,000.0
Total carrying value, net		7,520,105,000	6,496,977,000	7,520,105,000	6,496,977,000		6,496,977,000
Payment in kind interest		13,700,000	12,400,000	30,600,000	24,800,000
Commercial Mortgage and Subordinated Portfolio Segment
Financing Receivable, Credit Quality Indicator [Line Items]
Specific CECL allowance		145,000,000	197,481,000	145,000,000	$ 197,481,000	$ 175,000,000	175,000,000	$ 206,981,000	$ 56,981,000
Specific CECL Allowance				(30,000,000)
Write-offs, specific CECL allowance, funded		(10,000,000)	$ (15,000,000)
Total carrying value, net		$ 146,500,000		146,500,000			$ 136,100,000
Minimum
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, rent, price per square foot				50
Maximum
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, rent, price per square foot				$ 215
Maximum | Urban Predevelopment | Capitalization Rate
Financing Receivable, Credit Quality Indicator [Line Items]
Loan collateral, measurement input		0.055		0.055
Retail Center - Cincinnati, OH
Financing Receivable, Credit Quality Indicator [Line Items]
Specific CECL Allowance				$ (67,000,000.0)
Payment in kind interest		$ 400,000		$ 800,000
Retail Center - Cincinnati, OH | Capitalization Rate
Financing Receivable, Credit Quality Indicator [Line Items]
Loan collateral, measurement input		0.083		0.083
Mortgage, Amortized cost
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost prior to Specific CECL Allowance		$ 542,244,000		$ 542,244,000
Specific CECL allowance		145,000,000		145,000,000
Amortized cost		397,244,000		397,244,000
Mortgage, Amortized cost | Urban Predevelopment - Brooklyn, NY
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost prior to Specific CECL Allowance		182,652,000		182,652,000
Specific CECL allowance		10,000,000		10,000,000
Amortized cost		172,652,000		172,652,000
Mortgage, Amortized cost | Urban Predevelopment - Miami, FL
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost prior to Specific CECL Allowance		187,135,000		187,135,000
Specific CECL allowance		68,000,000		68,000,000
Amortized cost		119,135,000		119,135,000
Total carrying value, net		180,500,000		180,500,000
Mortgage, Amortized cost | Retail Center - Cincinnati, OH
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost prior to Specific CECL Allowance		172,457,000		172,457,000
Specific CECL allowance		67,000,000		67,000,000
Amortized cost		$ 105,457,000		$ 105,457,000

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