v3.26.1
Assets and Liabilities Measured at Fair Value on a Recurring Basis - Schedule of Fair Value of Net Unrealized Gains (Losses) Included in Changes in Net Assets Attributable to Investments and Loans Payable Using Significant Unobservable Inputs (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value, Recurring Basis, Unobservable Input, Reconciliation, Asset Gain (Loss), Statement Of Income, Extensible List Not Disclosed Flag investments and loans payable  
Total realized and unrealized gains (losses) included in changes in net assets $ 23.8 $ 26.3
Loans Payable    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total realized and unrealized (losses) gains included in changes in net assets 0.3 4.3
Real Estate Properties    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total realized and unrealized gains (losses) included in changes in net assets (2.7) (67.3)
Real Estate Joint Ventures    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total realized and unrealized gains (losses) included in changes in net assets 18.1 93.0
Real Estate Operating Business    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total realized and unrealized gains (losses) included in changes in net assets 9.4 (0.2)
Loans Receivable    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total realized and unrealized gains (losses) included in changes in net assets $ (1.0) $ 0.8