Loans Receivable - Schedule of Loans Receivable, Underlying Real Estate Collateral by Property Types (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2026	Dec. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal Outstanding	$ 833.9	$ 1,015.4
Fair Value	$ 564.3	$ 690.4
Credit Concentration Risk \| Loans Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
% of Fair Value	100.00%	100.00%
Office
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal Outstanding	$ 491.3	$ 672.7
Fair Value	$ 268.7	$ 394.7
Office \| Credit Concentration Risk \| Loans Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
% of Fair Value	47.60%	57.20%
Apartment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal Outstanding	$ 156.9	$ 157.2
Fair Value	$ 153.9	$ 154.1
Apartment \| Credit Concentration Risk \| Loans Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
% of Fair Value	27.30%	22.30%
Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal Outstanding	$ 136.9	$ 136.8
Fair Value	$ 136.9	$ 136.9
Industrial \| Credit Concentration Risk \| Loans Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
% of Fair Value	24.30%	19.80%
Retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal Outstanding	$ 44.0	$ 44.0
Fair Value	$ 0.0	$ 0.0
Retail \| Credit Concentration Risk \| Loans Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
% of Fair Value	0.00%	0.00%
Land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal Outstanding	$ 4.8	$ 4.7
Fair Value	$ 4.8	$ 4.7
Land \| Credit Concentration Risk \| Loans Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
% of Fair Value	0.80%	0.70%