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Earnings Per Share And Unit (Details) - shares
3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Jan. 11, 2024
Weighted average unvested shares outstanding 300,000 300,000    
Federal Realty OP LP        
Weighted average unvested units outstanding 300,000 300,000    
3.25% notes | Exchangeable senior notes        
Interest rate 3.25%     3.25%
3.25% notes | Exchangeable senior notes | Federal Realty OP LP        
Interest rate 3.25%      
5.417% Series 1 Cumulative Convertible Preferred shares        
Preferred shares, percentage 5.417% 5.417% 5.417%  
5.417% Series 1 Cumulative Convertible Preferred Units        
Preferred units, percentage 5.417% 5.417%    
Stock Options        
Anti-dilutive issuable shares 3,019 1,829    
Stock Options | Federal Realty OP LP        
Anti-dilutive issuable units 3,019 1,829    
Unvested restricted stock units        
Anti-dilutive issuable shares 10,441 10,441    
Unvested restricted stock units | Federal Realty OP LP        
Anti-dilutive issuable units 10,441 10,441