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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - Additional Information (Details) $ in Thousands, € in Millions, £ in Millions	1 Months Ended	3 Months Ended						12 Months Ended
	Apr. 29, 2024 USD ($)	Mar. 31, 2024 USD ($)	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($) loan	Mar. 31, 2023 GBP (£) loan	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	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%
Amortized cost of loans in cost recovery		$ 556,000						$ 693,700
Interest received for loans in cost recovery		$ 600		$ 700
Debt instrument, extension term		2 years
Increase in Specific CECL Allowance, net						$ (10,000)	$ 20,000
Write-offs, specific CECL allowance, funded		$ 0						81,890
Interest income from subordinate loans and other lending assets		849		9,707
Proceeds from pre-payment penalties or accelerated fees		100		0
Proceeds received from the repayment and sale of commercial mortgage loans		168,526		435,442
Valuation allowance, commercial mortgage loan held for sale		679		0
Gain on extinguishment of debt		$ 0		(213)
Debt instrument, extension option		6 months
2023 Notes
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gain on extinguishment of debt				(200)
Office - London, United Kingdom
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from collection of loans receivable				88,400	£ 72.2
Proceeds from interest received				700
Hotel - Honolulu, Hi
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan, mortgage, held-for-sale, price percentage		99.50%
Past Due 90
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost of loans in cost recovery		$ 556,000						693,700
Commercial Mortgage and Subordinated Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan and lease losses, real estate and off-balance sheet, credit loss, expense (reversal)		5,684		4,391
Increase in current expected credit loss allowance, net		142,000		$ 0
Mortgage loans on real estate, commercial and consumer, net		83,500						95,500
Increase in Specific CECL Allowance, net		$ 142,000
Write-offs, specific CECL allowance, funded			$ 82,000
Number of commercial mortgage loans | loan				3	3
Loans and leases receivable, gain (loss) on sales, net				$ 200
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							€ 205.7
Mortgage loans on real estate, commercial and consumer, funded, net				122,400							€ 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	£ 15.0
Floating Rate Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans on real estate, commercial and consumer, percentage of portfolio		99.00%
Mezzanine Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost of loans in cost recovery		$ 27,881
Mortgage loans on real estate, commercial and consumer, net		$ 534,800						$ 674,500
Senior and Junior Mezzanine Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans on real estate, commercial and consumer, percentage of portfolio		6.40%						8.00%
Junior Mezzanine B Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Increase in Specific CECL Allowance, net									$ 66,500
Junior Mezzanine A Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Increase in Specific CECL Allowance, net			$ 126,000
Mortgage, Amortized cost
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost of loans in cost recovery		$ 99,301
Mortgage, Amortized cost | Hotel - Honolulu, Hi
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial mortgage loan, held for sale		$ 135,500
Mortgage, Amortized cost | Hotel - Honolulu, Hi | Subsequent Event
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, gain (loss) on sales, net	$ (700)
Securitization Vehicle
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income from subordinate loans and other lending assets				$ 1,200
Senior Loans | Subsequent Event
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from (repayments of) secured debt	$ 108,300

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