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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - Cost Recovery Loans (Details)		3 Months Ended				12 Months Ended
	May 24, 2021 USD ($)	Dec. 31, 2021 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Oct. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]
Specific CECL allowance		$ 145,000,000		$ 175,000,000		$ 145,000,000	$ 175,000,000
Amortized cost		404,800,000		373,500,000		404,800,000	373,500,000
Reversal of Specific CECL Allowance	$ (10,000,000)					30,000,000	(118,019,000)	$ (13,000,000)
Specific CECL allowance (reversal), net of previously recorded amount						20,000,000
Total carrying value, net		7,857,260,000		6,496,977,000		7,857,260,000	6,496,977,000
Payment in kind interest						47,700,000	46,700,000	54,600,000
Commercial Mortgage and Subordinated Portfolio Segment
Financing Receivable, Credit Quality Indicator [Line Items]
Specific CECL allowance		145,000,000	$ 145,000,000	175,000,000	$ 197,481,000	145,000,000	175,000,000	$ 56,981,000	$ 145,000,000	$ 175,000,000		$ 196,931,000	$ 206,981,000
Reversal of Specific CECL Allowance						(30,000,000)
Write-offs, specific CECL allowance, funded		(10,000,000)	$ (10,000,000)	(21,931,000)	$ (15,000,000)
Total carrying value, net		$ 97,800,000		$ 136,100,000		97,800,000	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		0.055				0.055
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		0.050				0.050
Retail Center - Cincinnati, OH
Financing Receivable, Credit Quality Indicator [Line Items]
Payment in kind interest						$ 1,400,000	$ 1,600,000
Retail Center - Cincinnati, OH | Capitalization Rate
Financing Receivable, Credit Quality Indicator [Line Items]
Loan collateral, measurement input		0.080				0.080
Mortgage, Amortized cost
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost prior to Specific CECL Allowance		$ 549,787,000				$ 549,787,000
Specific CECL allowance		145,000,000				145,000,000
Amortized cost		404,787,000				404,787,000
Mortgage, Amortized cost | Urban Predevelopment - Brooklyn, NY
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost prior to Specific CECL Allowance		187,483,000				187,483,000
Specific CECL allowance		10,000,000				10,000,000
Amortized cost		177,483,000				177,483,000
Mortgage, Amortized cost | Urban Predevelopment - Miami, FL
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost prior to Specific CECL Allowance		190,492,000				190,492,000
Specific CECL allowance		68,000,000				68,000,000
Amortized cost		122,492,000				122,492,000
Total carrying value, net											$ 187,700,000
Mortgage, Amortized cost | Retail Center - Cincinnati, OH
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost prior to Specific CECL Allowance		171,812,000				171,812,000
Specific CECL allowance		67,000,000				67,000,000
Amortized cost		$ 104,812,000				$ 104,812,000

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