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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - Cost Recovery Loans (Details)	3 Months Ended
	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Oct. 31, 2020 USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]
Specific CECL allowance	$ 175,000,000	$ 145,000,000
Amortized cost		404,800,000
Total carrying value, net	$ 8,350,042,000	7,857,260,000
Equity contribution rate	90.00%
Payment in kind interest	$ 1,200,000		$ 16,800,000
Turner Consulting
Financing Receivable, Credit Quality Indicator [Line Items]
Equity contribution rate	10.00%
Commercial Mortgage and Subordinated Portfolio Segment
Financing Receivable, Credit Quality Indicator [Line Items]
Specific CECL allowance	$ 175,000,000	145,000,000	175,000,000	$ 175,000,000
Write-offs, specific CECL allowance, funded		(30,000,000)
Total carrying value, net	85,500,000	$ 97,800,000
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
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
Retail Center - Cincinnati, OH
Financing Receivable, Credit Quality Indicator [Line Items]
Payment in kind interest	$ 200,000		$ 300,000
Retail Center - Cincinnati, OH | Capitalization Rate
Financing Receivable, Credit Quality Indicator [Line Items]
Loan collateral, measurement input	0.080
Mortgage, Amortized cost
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost prior to Specific CECL Allowance	$ 551,983,000
Specific CECL allowance	145,000,000
Amortized cost	406,983,000
Mortgage, Amortized cost | Urban Predevelopment - Miami, FL
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost prior to Specific CECL Allowance	190,610,000
Specific CECL allowance	68,000,000
Amortized cost	122,610,000
Total carrying value, net					$ 187,900,000
Mortgage, Amortized cost | Multifamily Development - Brooklyn, NY
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost prior to Specific CECL Allowance	189,775,000
Specific CECL allowance	10,000,000
Amortized cost	179,775,000
Mortgage, Amortized cost | Retail Center - Cincinnati, OH
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost prior to Specific CECL Allowance	171,598,000
Specific CECL allowance	67,000,000
Amortized cost	104,598,000
Mezzanine Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost prior to Specific CECL Allowance	81,980,000
Specific CECL allowance	30,000,000
Amortized cost	51,980,000
Total carrying value, net	474,900,000
Payment in kind interest	138,600,000
Mezzanine Loans | Residential-for-Sale - Manhattan, NY
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost prior to Specific CECL Allowance	81,980,000
Specific CECL allowance	30,000,000
Amortized cost	51,980,000
Real Estate and Mezzanine
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost prior to Specific CECL Allowance	633,963,000
Specific CECL allowance	175,000,000
Amortized cost	$ 458,963,000

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