v3.26.1
Marketable Securities, Derivative Financial Instruments, Fair Value Measurements and Notes Payable (Details) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Jun. 30, 2025
Line of Credit [Member]      
Marketable Securities Derivative Financial Instruments Fair Value Measurements And Notes Payable (Details) [Line Items]      
Borrowing capacity $ 20.0    
Loan to value ratio based on the fair value (as a percent) 40.00%    
Line of credit, maturity date Nov. 30, 2026    
Description of line of credit interest rate SOFR plus 1.35%    
Line of credit, interest rate (as a percent) 5.00%    
Remaining available borrowings $ 17.9    
Simon OP Units [Member]      
Marketable Securities Derivative Financial Instruments Fair Value Measurements And Notes Payable (Details) [Line Items]      
Equity securities securities held during period 200,247 200,247  
Share price $ 223.65 $ 185.11 $ 160.76
Simon OP Units [Member] | Line of Credit [Member]      
Marketable Securities Derivative Financial Instruments Fair Value Measurements And Notes Payable (Details) [Line Items]      
Equity securities securities held during period 200,247    
Margin Loan [Member]      
Marketable Securities Derivative Financial Instruments Fair Value Measurements And Notes Payable (Details) [Line Items]      
Debt instrument, interest rate terms SOFR plus 0.85%    
Variable interest rate (as a percent) 4.50%