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Related Party Transactions (Details) € in Millions, £ in Millions, $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2024 USD ($) loan Rate	Mar. 31, 2023 USD ($) loan	Dec. 31, 2023 USD ($)	Mar. 31, 2023 EUR (€)	Mar. 31, 2023 GBP (£)	Feb. 08, 2023 USD ($) loan	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)
Related Party Transaction [Line Items]
Termination fee, percent fee of base management fee	3
Number of independent directors required | Rate	66.60%
Atlas Facility
Related Party Transaction [Line Items]
Number of loans | loan	5					1
Debt interest rate cap	2 years
Secured Debt | Credit Suisse Facility | Line of Credit
Related Party Transaction [Line Items]
Line of credit facility, current borrowing capacity						$ 632.3
Secured Debt | Atlas Facility | Line of Credit
Related Party Transaction [Line Items]
Line of credit facility, increase (decrease), other, net	$ 115.5
Line of Credit | Credit Suisse Facility
Related Party Transaction [Line Items]
Debt interest rate cap	2 years		6 months
Commercial Mortgage and Subordinated Portfolio Segment
Related Party Transaction [Line Items]
Number of commercial mortgage loans | loan		3
Mortgage loans on real estate, commercial and consumer, net	$ 83.5		$ 95.5
Debt interest rate cap	2 years 9 months 18 days
Mixed Use Property - London | Commercial Mortgage and Subordinated Portfolio Segment
Related Party Transaction [Line Items]
Mortgage loans on real estate, commercial and consumer, net | £					£ 15.0
Various Properties In Europe | Commercial Mortgage and Subordinated Portfolio Segment
Related Party Transaction [Line Items]
Mortgage loans on real estate, commercial and consumer, net		$ 219.0		€ 205.7
Mortgage loans on real estate, commercial and consumer, funded, net		122.4		€ 115.0
Arrangement fees
Related Party Transaction [Line Items]
Incentive Fee Payable							$ 0.4	$ 0.2
Limited Liability Company
Related Party Transaction [Line Items]
Rate of management fees	1.50%
Extension period	1 year
Period of termination	180 days
Termination fee calculation period	24 months
Limited Liability Company | Atlas Facility
Related Party Transaction [Line Items]
Extension period	1 year
Limited Liability Company | Management Agreement
Related Party Transaction [Line Items]
Payable to related party	$ 9.4		$ 9.6
Affiliated Entity
Related Party Transaction [Line Items]
Debt instrument, face amount								$ 30.0
Affiliated Entity | Management Agreement
Related Party Transaction [Line Items]
Management fees to related party	9.4	9.5
Professional and Contract Services Expense	$ 1.8	$ 1.2

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