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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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