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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - Additional Information (Details) £ in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
May 24, 2021 USD ($) | Mar. 31, 2022 USD ($) | Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2021 USD ($) | Nov. 30, 2020 USD ($) | Nov. 30, 2020 GBP (£)
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio |  |  | 100.00% |  |  | 100.00% |  |
Total carrying value, net |  |  | $ 8,350,042,000 |  |  | $ 7,857,260,000 |  |
Payment in kind interest |  |  | 1,200,000 | $ 16,800,000 |  |  |  |
Specific CECL Allowance |  | $ 10,000,000 | 30,000,000 | 0 |  |  |  |
Interest receivable |  |  | 44,370,000 |  |  | 41,219,000 |  |
Amortized cost of loans in cost recovery |  |  |  |  |  | 404,800,000 |  |
Interest received for loans in cost recovery |  |  | 200,000 | 300,000 |  |  |  |
Decrease in general CECL allowance |  |  | 11,400,000 |  |  |  |  |
Proceeds from pre-payment penalties or accelerated fees |  |  | 2,100,000 | $ 0 |  |  |  |
Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Total carrying value, net |  |  | 85,500,000 |  |  | 97,800,000 |  |
Specific CECL Allowance |  |  | (30,000,000) |  |  |  |  |
Subordinate Mortgage Portfolio Segment |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Total carrying value, net | [1] |  | 763,488,000 |  |  | 844,948,000 |  |
Maximum exposure to loss |  |  | $ 51,100,000 |  |  | $ 64,600,000 |  |
Maximum exposure to loss, term |  |  | 2 years 2 months 12 days | 5 years 9 months 18 days |  |  |  |
Urban Retail |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio |  |  | 4.30% |  |  | 9.00% |  |
Total carrying value, net |  |  |  |  |  |  | $ 422,700,000 | £ 309.2
Urban Retail | Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Total carrying value, net |  |  |  |  |  |  | $ 338,400,000 | £ 247.5
Past Due 90 |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Amortized cost of loans in cost recovery |  |  | $ 407,000,000 | $ 757,600,000 |  |  |  |
Floating Rate Loan |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio |  |  | 98.00% |  |  | 98.00% |  |
Mezzanine Loans |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Total carrying value, net |  |  | $ 474,900,000 |  |  |  |  |
Payment in kind interest |  |  | 138,600,000 |  |  |  |  |
Amortized cost of loans in cost recovery |  |  | 51,980,000 |  |  |  |  |
Mezzanine Loans | Subordinate Mortgage Portfolio Segment |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Specific CECL Allowance |  |  |  |  | $ 10,000,000 |  |  |
Senior Mezzanine Loans |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Total carrying value, net |  |  | 242,600,000 |  |  |  |  |
Junior Mezzanine A Loan |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Total carrying value, net |  |  | 180,300,000 |  |  |  |  |
Junior Mezzanine B Loan |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Total carrying value, net |  |  | 52,000,000 |  |  |  |  |
Specific CECL Allowance |  |  | $ 30,000,000 |  |  |  |  |
[1] | Net of $196,377 and $178,588 CECL Allowances in 2022 and 2021, respectively, comprised of $175,000 and $145,000 Specific CECL Allowance and $21,377 and $33,588 General CECL Allowance, respectively.

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