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Earnings Per Share (Details) - shares
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Weighted average unvested shares outstanding 300,000 300,000 300,000 300,000  
Federal Realty OP LP          
Weighted average unvested units outstanding 300,000 300,000 300,000 300,000  
5.417% Series 1 Cumulative Convertible Preferred Shares          
Preferred shares, percentage   5.417% 5.417% 5.417% 5.417%
5.417% Series 1 Cumulative Convertible Preferred Units          
Preferred units, percentage   5.417% 5.417% 5.417%  
Stock Options          
Anti-dilutive issuable shares   682   682  
Forward Sales Contracts          
Anti-dilutive issuable shares   900,000 1,800,000 1,700,000  
Forward Sales Contracts | Federal Realty OP LP          
Anti-dilutive issuable units   900,000 1,800,000 1,700,000  
Unvested restricted stock units          
Anti-dilutive issuable shares 10,441 10,441 10,441 10,441