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Investments in Loans and Financing Receivables - Schedule of Loans Receivables (Details) £ in Millions, $ in Millions	1 Months Ended
	Jun. 30, 2025 USD ($) note extension_option	Jun. 30, 2025 GBP (£)	Feb. 28, 2025 USD ($) extension_option	Jun. 30, 2025 GBP (£) note extension_option	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($) note
Financing Receivable, Allowance for Credit Loss [Line Items]
Principal	$ 1,350.5					$ 848.2
Allowance	$ (101.8)				$ (131.0)	$ (111.5)
Investment, Identifier [Axis]: Mortgage Loan
Financing Receivable, Allowance for Credit Loss [Line Items]
Interest rates						8.37%
Investment, Identifier [Axis]: Mortgage Loan Secured By An Office Property
Financing Receivable, Allowance for Credit Loss [Line Items]
Interest rates	7.50%			7.50%
Investment, Identifier [Axis]: Mortgage Loan Secured By a Logistics Property
Financing Receivable, Allowance for Credit Loss [Line Items]
Interest rates	7.50%			7.50%
Investment, Identifier [Axis]: Senior Secured Loan
Financing Receivable, Allowance for Credit Loss [Line Items]
Interest rates	8.125%			8.125%		8.125%
Interest, variable rate	5.75%			5.75%		5.75%
Investment, Identifier [Axis]: Unsecured And Mezzanine Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Interest rates			10.25%
Investment, Identifier [Axis]: Unsecured Loan
Financing Receivable, Allowance for Credit Loss [Line Items]
Interest rates						11.00%
Minimum \| Investment, Identifier [Axis]: Mortgage Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Interest rates	7.50%			7.50%
Minimum \| Investment, Identifier [Axis]: Unsecured And Mezzanine Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Interest rates	10.25%			10.25%
Maximum \| Investment, Identifier [Axis]: Mortgage Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Interest rates	8.37%			8.37%
Maximum \| Investment, Identifier [Axis]: Unsecured And Mezzanine Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Interest rates	11.00%			11.00%
Loans Receivable
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized Cost	$ 1,344.6					$ 840.8
Allowance	(14.8)				$ (14.1)	(12.3)
Carrying Amount	1,329.8					828.5
Senior Secured Notes Receivable
Financing Receivable, Allowance for Credit Loss [Line Items]
Principal	$ 880.4					$ 803.7
Number of interest-only notes bearing interest, held \| note	2			2		2
Senior Secured Notes Receivable \| Loans Receivable
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized Cost	$ 874.2					$ 797.2
Allowance	(11.7)					(11.4)
Carrying Amount	862.5					785.8
Mortgage Loan
Financing Receivable, Allowance for Credit Loss [Line Items]
Principal	255.4					33.5
Mortgage Loan \| Loans Receivable
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized Cost	255.6					33.5
Allowance	(0.1)					0.0
Carrying Amount	255.5					33.5
Accrued interest	17.4					13.8
Unsecured and Other Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Principal	214.7
Principal amount, acquired			$ 200.0
Number of extension options \| extension_option			2
Extension option term			12 months
Interest rate, PIK			10.75%
Repayments of debt			$ 199.8
Origination costs			$ 1.1
Unsecured and Other Loans \| Loans Receivable
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized Cost	214.8
Allowance	(3.0)
Carrying Amount	211.8
Unsecured Loan
Financing Receivable, Allowance for Credit Loss [Line Items]
Principal						11.0
Unsecured Loan \| Loans Receivable
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized Cost						10.1
Allowance						(0.9)
Carrying Amount						$ 9.2
Mortgage Loan Secured By An Office Property
Financing Receivable, Allowance for Credit Loss [Line Items]
Principal amount, acquired	$ 166.6	£ 121.5
Funding commitments \| £				£ 20.5
Funding commitment period	2 years	2 years
Mortgage Loan Secured By a Logistics Property
Financing Receivable, Allowance for Credit Loss [Line Items]
Principal amount, acquired	$ 55.3	£ 40.3
Funding commitments \| £				£ 8.5
Funding commitment period	3 years	3 years
Number of extension options \| extension_option	1			1
Extension option term	12 months	12 months