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Earnings Per Share And Unit (Details) - shares	3 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024	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%	5.417%
Stock Options
Anti-dilutive issuable shares	1,190	3,019
Stock Options | Federal Realty OP LP
Anti-dilutive issuable units	1,190	3,019
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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- Definition

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

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Incremental common units attributable to participating nonvested shares

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Preferred unit distribution rate percentage

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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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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