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Earnings Per Share And Unit (Details) - shares	3 Months Ended		12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025	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%
3.25% notes | Exchangeable senior notes | Federal Realty OP LP
Interest rate	3.25%	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%
Stock Options
Anti-dilutive issuable shares	1,190	1,190
Stock Options | Federal Realty OP LP
Anti-dilutive issuable units	1,190	1,190
Forward Sales Contracts
Anti-dilutive issuable shares		500,000
Forward Sales Contracts | Federal Realty OP LP
Anti-dilutive issuable units		500,000

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Antidilutive Securities Excluded from Computation of Net Income, Per Outstanding Unit, units

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Contractual interest rate for funds borrowed, under the debt agreement.

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The percentage rate used to calculate dividend payments on preferred stock.

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