Loan Portfolio - Schedule of Loans Receivable Held-for-investment by Loan Type (Details) (Parenthetical) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2026	Dec. 31, 2025
Schedule of Loans Receivable [Line Items]
Specific CECL reserves	$ 515.6	$ 365.4
Concentration of Risk
Schedule of Loans Receivable [Line Items]
Specific CECL reserves	$ 515.6	$ 365.4
Concentration of Risk \| Property Type
Schedule of Loans Receivable [Line Items]
Percentage of total portfolio loans	100.00%	100.00%
Concentration of Risk \| Property Type \| Mixed-Use, Office
Schedule of Loans Receivable [Line Items]
Percentage of total portfolio loans	3.00%	2.00%
Concentration of Risk \| Property Type \| Mixed-Use Life Science
Schedule of Loans Receivable [Line Items]
Percentage of total portfolio loans	3.00%	2.00%
Concentration of Risk \| Property Type \| Mixed-Use, Retail
Schedule of Loans Receivable [Line Items]
Percentage of total portfolio loans	2.00%	1.00%
Concentration of Risk \| Property Type \| Mixed-Use, Multifamily
Schedule of Loans Receivable [Line Items]
Percentage of total portfolio loans	2.00%	1.00%
Concentration of Risk \| Property Type \| Mixed-Use, Hospitality
Schedule of Loans Receivable [Line Items]
Percentage of total portfolio loans	3.00%	2.00%