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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - Additional Information (Details) € in Millions, £ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
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Apr. 30, 2024 USD ($) | Mar. 31, 2022 | Sep. 30, 2024 USD ($) | Jun. 30, 2024 USD ($) | Mar. 31, 2024 USD ($) | Sep. 30, 2023 USD ($) | Jun. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) Loan | Mar. 31, 2023 GBP (£) Loan | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Sep. 26, 2024 USD ($) | Mar. 31, 2023 GBP (£) | Mar. 31, 2023 EUR (€)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio |  |  |  |  |  |  |  |  |  | 100.00% |  | 100.00% |  |  |  |
Interest receivable |  |  | $ 78,330,000 |  |  |  |  |  |  | $ 78,330,000 |  | $ 72,354,000 |  |  |  |
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] |  |  |  |  |  |  |  |  |  | Secured Overnight Financing Rate [Member] |  |  |  |  |  |
Amortized cost of loans in cost recovery |  |  | 473,200,000 |  |  |  |  |  |  | $ 473,200,000 |  | 693,700,000 |  |  |  |
Interest received for loans in cost recovery |  |  | 7,000,000 |  |  | $ 600,000 |  |  |  | 8,300,000 | $ 1,900,000 |  |  |  |  |
Unfunded commitments |  |  | 3,850,000 |  |  |  |  |  |  | 3,850,000 |  | 4,017,000 |  |  |  |
Write-offs, specific CECL allowance, funded |  |  |  |  |  |  |  |  |  | 0 |  | 81,890,000 |  |  |  |
Assessed tax value |  |  |  |  |  |  |  |  |  | 200,800,000 |  |  |  |  |  |
Interest income from subordinate loans and other lending assets |  |  | 1,210,000 |  |  | 1,599,000 |  |  |  | 2,901,000 | 16,416,000 |  |  |  |  |
Proceeds from pre-payment penalties or accelerated fees |  |  | 4,200,000 |  |  | 200,000 |  |  |  | 5,100,000 | 400,000 |  |  |  |  |
Proceeds received from the repayment and sale of commercial mortgage loans |  |  |  |  |  |  |  |  |  | 1,580,003,000 | 749,716,000 |  |  |  |  |
Gain on extinguishment of debt |  |  | 0 |  |  | (30,000) |  |  |  | 0 | (495,000) |  |  |  |  |
Commonwealth |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency receivable |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 21,900,000 |  |
Loss contingency receivable attributable to ARI |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,000,000 |  |
Office - London, United Kingdom |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from collection of loans receivable |  |  |  |  |  |  |  | $ 88,400,000 | £ 72.2 |  |  |  |  |  |  |
Proceeds from interest received |  |  |  |  |  |  |  | 700,000 |  |  |  |  |  |  |  |
Office Property - New York City |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Floating rate | 3.92% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] | Secured Overnight Financing Rate (SOFR) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed rate | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hotel - Honolulu, Hi |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans and leases receivable, gain (loss) on sales, net | $ (700,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan, mortgage, held-for-sale, price percentage |  |  |  | 99.50% |  |  |  |  |  |  |  |  |  |  |  |
Massachusetts Healthcare |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method interest in joint venture |  |  | 159,700,000 |  |  |  |  |  |  | 159,700,000 |  |  |  |  |  |
Loans and leases receivable, gain (loss) on sales, net |  |  | (127,500,000) |  |  |  |  |  |  |  |  |  |  |  |  |
Past Due 90 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortized cost of loans in cost recovery |  |  | 473,200,000 |  |  |  |  |  |  | 473,200,000 |  | 693,700,000 |  |  |  |
Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in current expected credit loss allowance, net |  |  | 127,512,000 | $ 7,500,000 | $ 142,000,000 | 0 | $ 141,480,000 | $ 0 |  |  |  |  |  |  |  |
Specific CECL allowance increased |  |  | 127,500,000 | 7,500,000 | 142,000,000 |  | 141,500,000 |  |  | 149,500,000 |  |  |  |  |  |
Unfunded commitments |  |  | 17,300,000 |  |  |  |  |  |  | 17,300,000 |  | 0 |  |  |  |
Mortgage loans on real estate, commercial and consumer, net |  |  | 8,300,000 |  |  |  |  |  |  | $ 8,300,000 |  | $ 95,500,000 |  |  |  |
Write-offs, specific CECL allowance, funded |  |  | 127,512,000 |  |  |  | 81,980,000 |  |  |  |  |  |  |  |  |
Number of commercial mortgage loans | Loan |  |  |  |  |  |  |  | 3 | 3 |  |  |  |  |  |  |
Loans and leases receivable, gain (loss) on sales, net |  |  |  |  |  |  |  |  |  |  | 200,000 |  |  |  |  |
Commercial Mortgage and Subordinated Portfolio Segment | Various Properties In Europe |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, net |  |  |  |  |  |  |  | $ 219,000,000 |  |  |  |  |  |  |  | € 205.7
Mortgage loans on real estate, commercial and consumer, funded, net |  |  |  |  |  |  |  | 122,400,000 |  |  |  |  |  |  |  | € 115.0
Commercial Mortgage and Subordinated Portfolio Segment | Mixed Use Property - London |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, net | £ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | £ 15.0 |
Proceeds received from the repayment and sale of commercial mortgage loans |  |  |  |  |  |  |  | $ 18,200,000 | £ 15.0 |  |  |  |  |  |  |
Commercial Mortgage and Subordinated Portfolio Segment | Massachusetts Healthcare |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Specific CECL allowance increased |  |  | 127,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Write-offs, specific CECL allowance, funded |  |  | 127,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial Mortgage and Subordinated Portfolio Segment | Michigan Office |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Specific CECL allowance increased |  |  |  | 7,500,000 | $ 142,000,000 |  |  |  |  |  |  |  |  |  |  |
Specific allowance for credit loss reserve on amortized cost basis |  |  |  | 7,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Floating Rate Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio |  |  |  |  |  |  |  |  |  | 96.00% |  | 99.00% |  |  |  |
Mezzanine Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, net |  |  | $ 700,400,000 |  |  |  |  |  |  | $ 700,400,000 |  | $ 674,500,000 |  |  |  |
Senior and Junior Mezzanine Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio |  |  |  |  |  |  |  |  |  | 8.90% |  | 8.00% |  |  |  |
Junior Mezzanine B Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in Specific CECL Allowance, net |  |  |  |  |  |  |  |  |  |  |  |  | $ 66,500,000 |  |  |
Junior Mezzanine A Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in Specific CECL Allowance, net |  |  |  |  |  |  | $ 126,000,000 |  |  |  |  |  |  |  |  |
Mortgage, Amortized cost | Hotel - Honolulu, Hi |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans and leases receivable, gain (loss) on sales, net |  |  |  |  |  |  |  |  |  | $ 700,000 |  |  |  |  |  |
Securitization Vehicle |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income from subordinate loans and other lending assets |  |  |  |  |  | $ 500,000 |  |  |  |  | $ 3,100,000 |  |  |  |  |
Senior Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from (repayments of) secured debt |  |  |  | $ 108,300,000 |  |  |  |  |  |  |  |  |  |  |  |
Cleveland Multifamily |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Floating rate | 3.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] | Secured Overnight Financing Rate (SOFR) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed rate | 6.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, extension term |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |  |
First Mortgage Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage representing original whoile loan amount |  | 41.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |
First Mortgage Loan | Eight Hospitals in Massachusetts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan to cost percentage |  | 55.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |

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