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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - Cost Recovery Loans (Details)		3 Months Ended				9 Months Ended
	May 24, 2021 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 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		399,800,000				399,800,000			373,500,000
Specific CECL Allowance	$ (10,000,000)	0		$ 550,000		30,000,000	$ (139,950,000)
Specific CECL allowance (reversal), net of previously recorded amount		0				20,000,000
Total carrying value, net		7,257,304,000				7,257,304,000			6,496,977,000
Payment in kind interest		10,200,000		12,500,000		40,700,000	37,300,000
Commercial Mortgage and Subordinated Portfolio Segment
Financing Receivable, Credit Quality Indicator [Line Items]
Specific CECL allowance		145,000,000	$ 145,000,000	$ 196,931,000	$ 197,481,000	145,000,000	$ 196,931,000	$ 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)	$ (10,000,000)		$ (15,000,000)
Total carrying value, net		$ 152,500,000				152,500,000			$ 136,100,000
Minimum
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, rent, price per square foot						$ 48
Minimum | Urban Predevelopment | Capitalization Rate
Financing Receivable, Credit Quality Indicator [Line Items]
Loan collateral, measurement input		0.050				0.050
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)
Payment in kind interest		$ 200,000				$ 1,000,000
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		$ 544,770,000				$ 544,770,000
Specific CECL allowance		145,000,000				145,000,000
Amortized cost		399,770,000				399,770,000
Mortgage, Amortized cost | Urban Predevelopment - Brooklyn, NY
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost prior to Specific CECL Allowance		184,525,000				184,525,000
Specific CECL allowance		10,000,000				10,000,000
Amortized cost		174,525,000				174,525,000
Mortgage, Amortized cost | Urban Predevelopment - Miami, FL
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost prior to Specific CECL Allowance		188,000,000				188,000,000
Specific CECL allowance		68,000,000				68,000,000
Amortized cost		120,000,000				120,000,000
Total carrying value, net		185,300,000				185,300,000
Mortgage, Amortized cost | Retail Center - Cincinnati, OH
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost prior to Specific CECL Allowance		172,245,000				172,245,000
Specific CECL allowance		67,000,000				67,000,000
Amortized cost		$ 105,245,000				$ 105,245,000

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