The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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The number of real estate properties owned as of the balance sheet date.

+ References

No definition available.

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- Definition

The cash outflow associated with the investment in or advances to an entity in which the reporting entity shares control of the entity with another party or group.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (b)

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- Definition

The cash inflow from the capital received in cash from a partner in a partnership during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

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- Definition

The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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Real Estate Partnership (Narrative) (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended
	Jun. 05, 2014	Jun. 30, 2014
Schedule of Equity Method Investments [Line Items]
Number of Real Estate Properties		89
Federal / Lion Venture LP [Member]
Schedule of Equity Method Investments [Line Items]
Number of Real Estate Properties		7
Federal Realty Investment Trust [Member] \| Federal / Lion Venture LP [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest in partnership		30.00%
Capital Contribution to Joint Venture	$ 3.6
Clarion [Member] \| Federal / Lion Venture LP [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest in partnership		70.00%
Federal / Lion Venture LP [Member]
Schedule of Equity Method Investments [Line Items]
Proceeds from Contributed Capital	11.9
Federal / Lion Venture LP [Member]
Schedule of Equity Method Investments [Line Items]
Repayments of Secured Debt	$ 11.9