$FRT
Federal Realty Investment Trust Stock $frt

$frt Overview Financials Valuation SEC Filings Company Website

2020 Q4 Form 10-K Financial Statement

#000003490321000020 Filed on February 11, 2021

Income Statement

Concept	2020 Q4	2019 Q4	2018
Revenue	$219.5M	$239.1M	$915.4M
YoY Change	-8.22%	1.6%	6.78%
Cost Of Revenue	$77.40M	$76.70M	$287.9M
YoY Change	0.91%	1.72%	5.57%
Gross Profit	$142.1M	$162.5M	$627.6M
YoY Change	-12.55%	1.63%	7.36%
Gross Profit Margin	64.74%	67.95%	68.56%
Selling, General & Admin	$12.30M	$10.70M	$41.54M
YoY Change	14.95%	11.46%	-8.29%
% of Gross Profit	8.66%	6.58%	6.62%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$64.40M	$61.50M	$244.2M
YoY Change	4.72%	-8.07%	13.0%
% of Gross Profit	45.32%	37.85%	38.91%
Operating Expenses	$76.80M	$72.10M	$565.7M
YoY Change	6.52%	-5.87%	7.74%
Operating Profit	$65.30M	$176.2M	$361.6M
YoY Change	-62.94%	107.71%	-11.84%
Interest Expense	-$38.40M	-$27.30M	$110.2M
YoY Change	40.66%	-4.21%	10.02%
% of Operating Profit	-58.81%	-15.49%	30.46%
Other Income/Expense, Net
YoY Change
Pretax Income	$102.2M	$149.0M	$237.1M
YoY Change	-31.41%	171.4%	7.82%
Income Tax
% Of Pretax Income
Net Earnings	$94.70M	$147.4M	$241.9M
YoY Change	-35.73%	170.34%	-16.56%
Net Earnings / Revenue	43.14%	61.62%	26.43%
Basic Earnings Per Share		$1.92	$3.18
Diluted Earnings Per Share	$1.248M	$1.92	$3.18
COMMON SHARES
Basic Shares Outstanding	75.65M shares	75.52M shares	73.27M shares
Diluted Shares Outstanding			73.30M shares

Balance Sheet

Concept	2020 Q4	2019 Q4	2018
SHORT-TERM ASSETS
Cash & Short-Term Investments	$798.3M	$127.4M	$64.10M
YoY Change	526.61%	98.75%	321.71%
Cash & Equivalents	$798.3M	$127.4M	$64.10M
Short-Term Investments
Other Short-Term Assets	$200.4M	$200.9M	$221.5M
YoY Change	-0.25%	-24.39%	-6.85%
Inventory
Prepaid Expenses
Receivables	$159.8M	$152.6M	$142.2M
Other Receivables	$39.90M	$30.40M	$30.50M
Total Short-Term Assets	$1.198B	$511.3M	$458.3M
YoY Change	134.38%	1.75%	-7.1%
LONG-TERM ASSETS
Property, Plant & Equipment	$6.369B	$6.227B	$5.744B
YoY Change	2.27%	8.42%	-0.26%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$22.10M	$28.60M	$26.90M
YoY Change	-22.73%	6.32%	12.55%
Other Assets	$18.60M	$27.90M	$60.80M
YoY Change	-33.33%	68.07%
Total Long-Term Assets	$6.409B	$6.284B	$5.831B
YoY Change	2.0%	8.58%	0.84%
TOTAL ASSETS
Total Short-Term Assets	$1.198B	$511.3M	$458.3M
Total Long-Term Assets	$6.409B	$6.284B	$5.831B
Total Assets	$7.608B	$6.795B	$6.290B
YoY Change	11.96%	8.03%	0.22%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$228.6M	$255.5M	$177.9M
YoY Change	-10.53%	43.62%	-9.37%
Accrued Expenses	$72.40M	$73.60M
YoY Change	-1.63%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$405.2M	$432.5M	$274.0M
YoY Change	-6.31%	57.85%	-5.16%
LONG-TERM LIABILITIES
Long-Term Debt	$4.363B	$3.429B	$3.229B
YoY Change	27.26%	6.18%	-1.69%
Other Long-Term Liabilities	$152.4M	$157.9M	$182.9M
YoY Change	-3.48%	-13.67%	7.97%
Total Long-Term Liabilities	$4.516B	$3.587B	$3.412B
YoY Change	25.91%	5.11%	-1.22%
TOTAL LIABILITIES
Total Short-Term Liabilities	$405.2M	$432.5M	$274.0M
Total Long-Term Liabilities	$4.516B	$3.587B	$3.412B
Total Liabilities	$4.921B	$4.019B	$3.944B
YoY Change	22.44%	9.03%	-1.63%
SHAREHOLDERS EQUITY
Retained Earnings
YoY Change
Common Stock	$3.298B	$3.167B
YoY Change	4.13%	5.39%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$2.464B	$2.535B	$2.346B
YoY Change
Total Liabilities & Shareholders Equity	$7.608B	$6.795B	$6.290B
YoY Change	11.96%	8.03%	0.22%

Cashflow Statement

Concept	2020 Q4	2019 Q4	2018
OPERATING ACTIVITIES
Net Income	$94.70M	$147.4M	$241.9M
YoY Change	-35.73%	170.34%	-16.56%
Depreciation, Depletion And Amortization	$64.40M	$61.50M	$244.2M
YoY Change	4.72%	-8.07%	13.0%
Cash From Operating Activities	$101.5M	$117.6M	$516.7M
YoY Change	-13.69%	-22.63%	12.61%
INVESTING ACTIVITIES
Capital Expenditures	-$152.7M	-$289.2M	-$381.8M
YoY Change	-47.2%	162.91%	-60.09%
Acquisitions
YoY Change
Other Investing Activities	$157.9M	$199.9M	$189.5M
YoY Change	-21.01%	577.63%	59.51%
Cash From Investing Activities	$5.200M	-$89.20M	-$192.2M
YoY Change	-105.83%	10.95%	-77.06%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net			$130.9M
YoY Change			10.4%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-178.3M	-81.60M	-$241.3M
YoY Change	118.5%	40.69%	-165.32%
NET CHANGE
Cash From Operating Activities	101.5M	117.6M	$516.7M
Cash From Investing Activities	5.200M	-89.20M	-$192.2M
Cash From Financing Activities	-178.3M	-81.60M	-$241.3M
Net Change In Cash	-71.60M	-53.20M	$83.13M
YoY Change	34.59%	-491.18%	-961.56%
FREE CASH FLOW
Cash From Operating Activities	$101.5M	$117.6M	$516.7M
Capital Expenditures	-$152.7M	-$289.2M	-$381.8M
Free Cash Flow	$254.2M	$406.8M	$898.5M
YoY Change	-37.51%	55.27%	-36.53%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2020	dei	Entity Central Index Key EntityCentralIndexKey	0000034903
CY2020	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2020	dei	Document Period End Date DocumentPeriodEndDate	2020-12-31
CY2020	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
CY2020	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2020	dei	Amendment Flag AmendmentFlag	false
CY2021Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	76747943	shares
CY2020Q2	dei	Entity Public Float EntityPublicFloat	6400000000	USD
CY2020Q4	frt	Operating Real Estate From Consolidated Variable Interest Entities OperatingRealEstateFromConsolidatedVariableInterestEntities	1703202000	USD
CY2019Q4	frt	Operating Real Estate From Consolidated Variable Interest Entities OperatingRealEstateFromConsolidatedVariableInterestEntities	1676866000	USD
CY2020Q4	frt	Constructioninprogresofconsolidatedvariableieestentity Constructioninprogresofconsolidatedvariableieestentity	44896000	USD
CY2019Q4	frt	Constructioninprogresofconsolidatedvariableieestentity Constructioninprogresofconsolidatedvariableieestentity	102583000	USD
CY2020Q4	frt	Accumulated Depreciation And Amortization Consolidated Variable Interest Entities AccumulatedDepreciationAndAmortizationConsolidatedVariableInterestEntities	335735000	USD
CY2019Q4	frt	Accumulated Depreciation And Amortization Consolidated Variable Interest Entities AccumulatedDepreciationAndAmortizationConsolidatedVariableInterestEntities	296165000	USD
CY2020Q4	frt	Mortgage Payable From Consolidated Variable Interest Entities MortgagePayableFromConsolidatedVariableInterestEntities	413681000	USD
CY2019Q4	frt	Mortgage Payable From Consolidated Variable Interest Entities MortgagePayableFromConsolidatedVariableInterestEntities	469184000	USD
CY2020Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	15000000	shares
CY2019Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	15000000	shares
CY2020Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2019Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
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CY2020Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	100000000	shares
CY2019Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	100000000	shares
CY2020Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	76727394	shares
CY2019Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	75540804	shares
CY2020Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	76727394	shares
CY2019Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	75540804	shares
CY2018	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	3865000	USD
CY2019	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	3430000	USD
CY2020	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	2228000	USD
CY2020	frt	Other Comprehensive Loss Attributable To Redeemable Noncontrolling Interests OtherComprehensiveLossAttributableToRedeemableNoncontrollingInterests	-471000	USD
CY2019	frt	Other Comprehensive Loss Attributable To Redeemable Noncontrolling Interests OtherComprehensiveLossAttributableToRedeemableNoncontrollingInterests	0	USD
CY2018	frt	Other Comprehensive Loss Attributable To Redeemable Noncontrolling Interests OtherComprehensiveLossAttributableToRedeemableNoncontrollingInterests	0	USD
CY2018	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	4.04
CY2019	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	4.14
CY2020	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	4.22
CY2020Q4	us-gaap	Line Of Credit LineOfCredit	0	USD
CY2020	us-gaap	Preferred Stock Dividend Rate Percentage PreferredStockDividendRatePercentage	0.050
CY2019	us-gaap	Preferred Stock Dividend Rate Percentage PreferredStockDividendRatePercentage	0.050
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CY2020	frt	Commonsharesqualifieddividendstaxrate Commonsharesqualifieddividendstaxrate	0.1500
CY2019	frt	Commonsharesqualifieddividendstaxrate Commonsharesqualifieddividendstaxrate	0.1500
CY2018	frt	Commonsharesqualifieddividendstaxrate Commonsharesqualifieddividendstaxrate	0.1500
CY2020	frt	Preferred Stock Qualified Dividends Tax Rate PreferredStockQualifiedDividendsTaxRate	0.1500
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CY2020	dei	Document Type DocumentType	10-K
CY2020	dei	Document Annual Report DocumentAnnualReport	true
CY2020	dei	Document Transition Report DocumentTransitionReport	false
CY2020	dei	Entity File Number EntityFileNumber	1-07533
CY2020	dei	Entity Registrant Name EntityRegistrantName	FEDERAL REALTY INVESTMENT TRUST
CY2020	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	MD
CY2020	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	52-0782497
CY2020	dei	Entity Address Address Line1 EntityAddressAddressLine1	909 Rose Avenue, Suite 200
CY2020	dei	Entity Address City Or Town EntityAddressCityOrTown	North Bethesda
CY2020	dei	Entity Address State Or Province EntityAddressStateOrProvince	MD
CY2020	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	20852
CY2020	dei	City Area Code CityAreaCode	301)
CY2020	dei	Local Phone Number LocalPhoneNumber	998-8100
CY2020	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2020	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2020	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2020	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2020	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2020	dei	Entity Small Business EntitySmallBusiness	false
CY2020	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2020	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2020	dei	Entity Shell Company EntityShellCompany	false
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CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2018	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-2012000	USD
CY2018	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-3398000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	135888000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	360542000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	249026000	USD
CY2020	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	4182000	USD
CY2019	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	6676000	USD
CY2018	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	7119000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	131706000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	353866000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	241907000	USD
CY2020	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	8042000	USD
CY2019	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	8042000	USD
CY2018	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	8042000	USD
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	123664000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	345824000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	233865000	USD
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.62
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.61
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.18
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	75515000	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	74766000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	73274000	shares
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.62
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.61
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.18
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	75515000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	74766000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	73302000	shares
CY2020	us-gaap	Profit Loss ProfitLoss	135888000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	360542000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	249026000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-5302000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-397000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-438000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	130586000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	360145000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	248588000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	3711000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	6676000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	7119000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	126875000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	353469000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	241469000	USD
CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2391514000	USD
CY2018	frt	Adoption Of New Accounting Standard AdoptionOfNewAccountingStandard	-6028000	USD
CY2018	frt	Profit Loss Excluding Redeemable Noncontrolling Interests ProfitLossExcludingRedeemableNoncontrollingInterests	245161000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-438000	USD
CY2018	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	297347000	USD
CY2018	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	8042000	USD
CY2018	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	5175000	USD
CY2018	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	126071000	USD
CY2018	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	4572000	USD
CY2018	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	2159000	USD
CY2018	frt	Share Based Compensation Expense Net Value ShareBasedCompensationExpenseNetValue	12736000	USD
CY2018	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	958000	USD
CY2018	frt	Conversion And Redemption Of Operating Partnership Units ConversionAndRedemptionOfOperatingPartnershipUnits	6012000	USD
CY2018	frt	Contributionsfromnoncontrollinginterests Contributionsfromnoncontrollinginterests	4020000	USD
CY2018	us-gaap	Stockholders Equity Other StockholdersEquityOther	-5097000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2467330000	USD
CY2019	frt	Adoption Of New Accounting Standard AdoptionOfNewAccountingStandard	-7098000	USD
CY2019	frt	Profit Loss Excluding Redeemable Noncontrolling Interests ProfitLossExcludingRedeemableNoncontrollingInterests	357112000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-397000	USD
CY2019	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	310973000	USD
CY2019	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	8042000	USD
CY2019	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	9961000	USD
CY2019	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	142716000	USD
CY2019	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	2095000	USD
CY2019	frt	Share Based Compensation Expense Net Value ShareBasedCompensationExpenseNetValue	13330000	USD
CY2019	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	4626000	USD
CY2019	frt	Conversion And Redemption Of Operating Partnership Units ConversionAndRedemptionOfOperatingPartnershipUnits	72000	USD
CY2019	frt	Contributionsfromnoncontrollinginterests Contributionsfromnoncontrollinginterests	243000	USD
CY2019	us-gaap	Stockholders Equity Other StockholdersEquityOther	5525000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2636132000	USD
CY2020	frt	Adoption Of New Accounting Standard AdoptionOfNewAccountingStandard	-510000	USD
CY2020	frt	Profit Loss Excluding Redeemable Noncontrolling Interests ProfitLossExcludingRedeemableNoncontrollingInterests	133660000	USD
CY2020	frt	Other Comprehensive Income Loss Net Of Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossNetOfPortionAttributableToNoncontrollingInterest	-4831000	USD
CY2020	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	320302000	USD
CY2020	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	8042000	USD
CY2020	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	8874000	USD
CY2020	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	98839000	USD
CY2020	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	2072000	USD
CY2020	frt	Share Based Compensation Expense Net Value ShareBasedCompensationExpenseNetValue	13243000	USD
CY2020	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	4052000	USD
CY2020	frt	Conversion And Redemption Of Operating Partnership Units ConversionAndRedemptionOfOperatingPartnershipUnits	3320000	USD
CY2020	frt	Contributionsfromnoncontrollinginterests Contributionsfromnoncontrollinginterests	120000	USD
CY2020	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	7321000	USD
CY2020	us-gaap	Stockholders Equity Other StockholdersEquityOther	-21933000	USD
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2548747000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	135888000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	360542000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	249026000	USD
CY2020	frt	Adjustment Depreciation And Amortization AdjustmentDepreciationAndAmortization	255027000	USD
CY2019	frt	Adjustment Depreciation And Amortization AdjustmentDepreciationAndAmortization	239758000	USD
CY2018	frt	Adjustment Depreciation And Amortization AdjustmentDepreciationAndAmortization	244245000	USD
CY2020	us-gaap	Other Asset Impairment Charges OtherAssetImpairmentCharges	57218000	USD
CY2019	us-gaap	Other Asset Impairment Charges OtherAssetImpairmentCharges	0	USD
CY2018	us-gaap	Other Asset Impairment Charges OtherAssetImpairmentCharges	0	USD
CY2020	us-gaap	Gain Loss On Sale Of Properties GainLossOnSaleOfProperties	98117000	USD
CY2019	us-gaap	Gain Loss On Sale Of Properties GainLossOnSaleOfProperties	116393000	USD
CY2018	us-gaap	Gain Loss On Sale Of Properties GainLossOnSaleOfProperties	11915000	USD
CY2020	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-11179000	USD
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2018	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2020	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-8062000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-2012000	USD
CY2018	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-3398000	USD
CY2020	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-6142000	USD
CY2019	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-169000	USD
CY2018	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-4147000	USD
CY2020	frt	Proceedsfromnewmarkettaxcredittransactionnetofdeferredcosts Proceedsfromnewmarkettaxcredittransactionnetofdeferredcosts	0	USD
CY2019	frt	Proceedsfromnewmarkettaxcredittransactionnetofdeferredcosts Proceedsfromnewmarkettaxcredittransactionnetofdeferredcosts	0	USD
CY2018	frt	Proceedsfromnewmarkettaxcredittransactionnetofdeferredcosts Proceedsfromnewmarkettaxcredittransactionnetofdeferredcosts	12353000	USD
CY2020	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	6032000	USD
CY2019	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	16128000	USD
CY2018	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	-917000	USD
CY2020	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	3260000	USD
CY2019	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	10253000	USD
CY2018	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	2070000	USD
CY2020	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	5621000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	2327000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	2650000	USD
CY2020	frt	Increase Decrease In Security Deposits And Other Liabilities IncreaseDecreaseInSecurityDepositsAndOtherLiabilities	-1799000	USD
CY2019	frt	Increase Decrease In Security Deposits And Other Liabilities IncreaseDecreaseInSecurityDepositsAndOtherLiabilities	-115000	USD
CY2018	frt	Increase Decrease In Security Deposits And Other Liabilities IncreaseDecreaseInSecurityDepositsAndOtherLiabilities	13937000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	369929000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	461919000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	516688000	USD
CY2020	us-gaap	Payments To Acquire Real Estate PaymentsToAcquireRealEstate	9589000	USD
CY2019	us-gaap	Payments To Acquire Real Estate PaymentsToAcquireRealEstate	204516000	USD
CY2018	us-gaap	Payments To Acquire Real Estate PaymentsToAcquireRealEstate	13503000	USD
CY2020	frt	Capital Expenditures Development Redevelopment CapitalExpendituresDevelopmentRedevelopment	433872000	USD
CY2019	frt	Capital Expenditures Development Redevelopment CapitalExpendituresDevelopmentRedevelopment	327074000	USD
CY2018	frt	Capital Expenditures Development Redevelopment CapitalExpendituresDevelopmentRedevelopment	302120000	USD
CY2020	frt	Capital Expenditures Other CapitalExpendituresOther	68064000	USD
CY2019	frt	Capital Expenditures Other CapitalExpendituresOther	82836000	USD
CY2018	frt	Capital Expenditures Other CapitalExpendituresOther	66138000	USD
CY2020	frt	Costs Associated With Lease Buyout For A Property Sold CostsAssociatedWithLeaseBuyoutForAPropertySold	12924000	USD
CY2019	frt	Costs Associated With Lease Buyout For A Property Sold CostsAssociatedWithLeaseBuyoutForAPropertySold	0	USD
CY2018	frt	Costs Associated With Lease Buyout For A Property Sold CostsAssociatedWithLeaseBuyoutForAPropertySold	0	USD
CY2020	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	183461000	USD
CY2019	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	321997000	USD
CY2018	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	177775000	USD
CY2020	us-gaap	Payments For Proceeds From Real Estate Partnership Investment Net PaymentsForProceedsFromRealEstatePartnershipInvestmentNet	0	USD
CY2019	us-gaap	Payments For Proceeds From Real Estate Partnership Investment Net PaymentsForProceedsFromRealEstatePartnershipInvestmentNet	0	USD
CY2018	us-gaap	Payments For Proceeds From Real Estate Partnership Investment Net PaymentsForProceedsFromRealEstatePartnershipInvestmentNet	-37998000	USD
CY2020	us-gaap	Payments To Acquire Interest In Subsidiaries And Affiliates PaymentsToAcquireInterestInSubsidiariesAndAffiliates	3348000	USD
CY2019	us-gaap	Payments To Acquire Interest In Subsidiaries And Affiliates PaymentsToAcquireInterestInSubsidiariesAndAffiliates	1052000	USD
CY2018	us-gaap	Payments To Acquire Interest In Subsidiaries And Affiliates PaymentsToAcquireInterestInSubsidiariesAndAffiliates	1037000	USD
CY2020	us-gaap	Proceeds From Distributions Received From Real Estate Partnerships ProceedsFromDistributionsReceivedFromRealEstatePartnerships	1301000	USD
CY2019	us-gaap	Proceeds From Distributions Received From Real Estate Partnerships ProceedsFromDistributionsReceivedFromRealEstatePartnerships	2765000	USD
CY2018	us-gaap	Proceeds From Distributions Received From Real Estate Partnerships ProceedsFromDistributionsReceivedFromRealEstatePartnerships	275000	USD
CY2020	us-gaap	Increase Decrease In Lease Acquisition Costs IncreaseDecreaseInLeaseAcquisitionCosts	15080000	USD
CY2019	us-gaap	Increase Decrease In Lease Acquisition Costs IncreaseDecreaseInLeaseAcquisitionCosts	25459000	USD
CY2018	us-gaap	Increase Decrease In Lease Acquisition Costs IncreaseDecreaseInLeaseAcquisitionCosts	25430000	USD
CY2020	frt	Issuance Repayments Of Mortgage And Other Notes Receivable Net IssuanceRepaymentsOfMortgageAndOtherNotesReceivableNet	10268000	USD
CY2019	frt	Issuance Repayments Of Mortgage And Other Notes Receivable Net IssuanceRepaymentsOfMortgageAndOtherNotesReceivableNet	357000	USD
CY2018	frt	Issuance Repayments Of Mortgage And Other Notes Receivable Net IssuanceRepaymentsOfMortgageAndOtherNotesReceivableNet	67000	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-368383000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-316532000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-192247000	USD
CY2020	us-gaap	Proceeds From Repayments Of Lines Of Credit ProceedsFromRepaymentsOfLinesOfCredit	-638000	USD
CY2019	us-gaap	Proceeds From Repayments Of Lines Of Credit ProceedsFromRepaymentsOfLinesOfCredit	-4012000	USD
CY2018	us-gaap	Proceeds From Repayments Of Lines Of Credit ProceedsFromRepaymentsOfLinesOfCredit	-41000000	USD
CY2020	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	1094283000	USD
CY2019	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	399913000	USD
CY2018	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	0	USD
CY2020	us-gaap	Repayments Of Senior Debt RepaymentsOfSeniorDebt	510360000	USD
CY2019	us-gaap	Repayments Of Senior Debt RepaymentsOfSeniorDebt	0	USD
CY2018	us-gaap	Repayments Of Senior Debt RepaymentsOfSeniorDebt	0	USD
CY2020	us-gaap	Proceeds From Notes Payable ProceedsFromNotesPayable	398722000	USD
CY2019	us-gaap	Proceeds From Notes Payable ProceedsFromNotesPayable	0	USD
CY2018	us-gaap	Proceeds From Notes Payable ProceedsFromNotesPayable	0	USD
CY2020	us-gaap	Repayments Of Long Term Debt And Capital Securities RepaymentsOfLongTermDebtAndCapitalSecurities	70237000	USD
CY2019	us-gaap	Repayments Of Long Term Debt And Capital Securities RepaymentsOfLongTermDebtAndCapitalSecurities	301029000	USD
CY2018	us-gaap	Repayments Of Long Term Debt And Capital Securities RepaymentsOfLongTermDebtAndCapitalSecurities	16620000	USD
CY2020	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	99177000	USD
CY2019	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	143027000	USD
CY2018	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	130918000	USD
CY2020	frt	Dividends Paid To Common And Preferred Shareholders DividendsPaidToCommonAndPreferredShareholders	324596000	USD
CY2019	frt	Dividends Paid To Common And Preferred Shareholders DividendsPaidToCommonAndPreferredShareholders	313649000	USD
CY2018	frt	Dividends Paid To Common And Preferred Shareholders DividendsPaidToCommonAndPreferredShareholders	301194000	USD
CY2020	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	4052000	USD
CY2019	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	4626000	USD
CY2018	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	958000	USD
CY2020	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	0	USD
CY2019	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	404000	USD
CY2018	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	2838000	USD
CY2020	frt	Paymentsofdividendsandredemptionsminorityinterest Paymentsofdividendsandredemptionsminorityinterest	20563000	USD
CY2019	frt	Paymentsofdividendsandredemptionsminorityinterest Paymentsofdividendsandredemptionsminorityinterest	20133000	USD
CY2018	frt	Paymentsofdividendsandredemptionsminorityinterest Paymentsofdividendsandredemptionsminorityinterest	15293000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	661736000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-100105000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-241309000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	663282000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	45282000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	83132000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	153614000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	108332000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	25200000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	816896000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	153614000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	108332000	USD
CY2020	us-gaap	Nature Of Operations NatureOfOperations	BUSINESS AND ORGANIZATION<div style="margin-top:5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Federal Realty Investment Trust (the “Trust”) is an equity real estate investment trust (“REIT”) specializing in the ownership, management, and redevelopment of retail and mixed-use properties. Our properties are located primarily in densely populated and affluent communities in strategically selected metropolitan markets in the Mid-Atlantic and Northeast regions of the United States, California, and South Florida. As of December 31, 2020, we owned or had a majority interest in community and neighborhood shopping centers and mixed-use properties which are operated as 101 predominantly retail real estate projects.</span></div><div style="margin-top:9pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">We operate in a manner intended to enable us to qualify as a REIT for federal income tax purposes. A REIT that distributes at least 90% of its taxable income to its shareholders each year and meets certain other conditions is not taxed on that portion of its taxable income which is distributed to its shareholders.</span></div><div style="margin-top:14pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Impacts of COVID-19 Pandemic</span></div><div style="margin-top:5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">In March 2020, the World Health Organization declared the outbreak of novel coronavirus disease ("COVID-19") as a pandemic. While we currently expect the impact to our properties is temporary in nature, the extent of the future effects of COVID-19 on our business, results of operations, cash flows, and growth prospects is highly uncertain and will ultimately depend on future developments, none of which can be predicted with any certainty.</span></div>
CY2020Q4	us-gaap	Number Of Real Estate Properties NumberOfRealEstateProperties	101	project
CY2020	frt	Minimum Percentage Of Taxable Income Distributed To Shareholders MinimumPercentageOfTaxableIncomeDistributedToShareholders	0.90
CY2020	us-gaap	Use Of Estimates UseOfEstimates	<div style="margin-top:14pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Use of Estimates</span></div><div style="margin-top:5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America, referred to as “GAAP,” requires management to make estimates and assumptions that in certain circumstances affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities, and revenues and expenses. These estimates are prepared using management’s best judgment, after considering past, current and expected events and economic conditions. Actual results could differ from these estimates.</span></div>
CY2020Q4	us-gaap	Deferred Rent Receivables Net DeferredRentReceivablesNet	36000000	USD
CY2020Q4	frt	Rent Abatementin Period RentAbatementinPeriod	35000000	USD
CY2020	frt	Collectibility Adjustment CollectibilityAdjustment	106600000	USD
CY2020	us-gaap	Straight Line Rent Adjustments StraightLineRentAdjustments	12700000	USD
CY2020Q4	frt	Tenants With Revenue Recognized On A Cash Basis Method TenantsWithRevenueRecognizedOnACashBasisMethod	0.35
CY2020Q4	frt	Straight Line Rent Receivable StraightLineRentReceivable	103300000	USD
CY2019Q4	frt	Straight Line Rent Receivable StraightLineRentReceivable	100300000	USD
CY2020	frt	Depreciation Expense Real Estate DepreciationExpenseRealEstate	227900000	USD
CY2019	frt	Depreciation Expense Real Estate DepreciationExpenseRealEstate	215400000	USD
CY2018	frt	Depreciation Expense Real Estate DepreciationExpenseRealEstate	216000000.0	USD
CY2020	us-gaap	Property Plant And Equipment Impairment PropertyPlantAndEquipmentImpairment	<div style="margin-top:14pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Long-Lived Assets and Impairment </span></div><div style="margin-top:5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">There are estimates and assumptions made by management in preparing the consolidated financial statements for which the actual results will be determined over long periods of time. This includes the recoverability of long-lived assets, including our properties that have been acquired or redeveloped and our investment in certain joint ventures. Management’s evaluation of impairment includes review for possible indicators of impairment as well as, in certain circumstances, undiscounted and discounted cash flow analysis. Since most of our investments in real estate are wholly-owned or controlled assets which are held for use, a property with impairment indicators is first tested for impairment by comparing the undiscounted cash flows, including residual value, to the current net book value of the property. If the undiscounted cash flows are less than the net book value, the property is written down to expected fair value. </span></div><div style="margin-top:5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The calculation of both discounted and undiscounted cash flows requires management to make estimates of future cash flows including revenues, operating expenses, required maintenance and development expenditures, market conditions, demand for space by tenants and rental rates over long periods. Because our properties typically have a long life, the assumptions used to estimate the future recoverability of book value requires significant management judgment. Actual results could be significantly different from the estimates. These estimates have a direct impact on net income, because recording an impairment charge results in a negative adjustment to net income.</span></div>
CY2020Q4	us-gaap	Cash Uninsured Amount CashUninsuredAmount	803600000	USD
CY2020	frt	Residual Profit Maximum ResidualProfitMaximum	0.50
CY2020	srt	Mortgage Loans On Real Estate Number Of Loans MortgageLoansOnRealEstateNumberOfLoans	4
CY2020Q4	us-gaap	Notes Receivable Net NotesReceivableNet	39900000	USD
CY2020	frt	Weighted Average Interest Rateon Financing Receivable WeightedAverageInterestRateonFinancingReceivable	0.100
CY2019Q4	us-gaap	Redeemable Noncontrolling Interest Equity Carrying Amount RedeemableNoncontrollingInterestEquityCarryingAmount	139758000	USD
CY2020Q4	frt	Numberof Consolidated Variable Interest Entities NumberofConsolidatedVariableInterestEntities	17
CY2020Q4	frt	Variable Interest Entity Net Real Estate Assets VariableInterestEntityNetRealEstateAssets	1400000000	USD
CY2019Q4	frt	Variable Interest Entity Net Real Estate Assets VariableInterestEntityNetRealEstateAssets	1500000000	USD
CY2020Q4	frt	Mortgage Payable From Consolidated Variable Interest Entities MortgagePayableFromConsolidatedVariableInterestEntities	413700000	USD
CY2019Q4	frt	Mortgage Payable From Consolidated Variable Interest Entities MortgagePayableFromConsolidatedVariableInterestEntities	469200000	USD
CY2019Q4	us-gaap	Redeemable Noncontrolling Interest Equity Carrying Amount RedeemableNoncontrollingInterestEquityCarryingAmount	139758000	USD
CY2018Q4	us-gaap	Redeemable Noncontrolling Interest Equity Carrying Amount RedeemableNoncontrollingInterestEquityCarryingAmount	136208000	USD
CY2020	frt	Redeemable Noncontrolling Interests Contributions RedeemableNoncontrollingInterestsContributions	19335000	USD
CY2019	frt	Redeemable Noncontrolling Interests Contributions RedeemableNoncontrollingInterestsContributions	9961000	USD
CY2020	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	2228000	USD
CY2019	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	3430000	USD
CY2020	frt	Redeemable Noncontrolling Interests Distributions RedeemableNoncontrollingInterestsDistributions	1197000	USD
CY2019	frt	Redeemable Noncontrolling Interests Distributions RedeemableNoncontrollingInterestsDistributions	15366000	USD
CY2020	frt	Other Comprehensive Loss Attributable To Redeemable Noncontrolling Interests OtherComprehensiveLossAttributableToRedeemableNoncontrollingInterests	-471000	USD
CY2019	frt	Other Comprehensive Loss Attributable To Redeemable Noncontrolling Interests OtherComprehensiveLossAttributableToRedeemableNoncontrollingInterests	0	USD
CY2020	us-gaap	Temporary Equity Other Changes TemporaryEquityOtherChanges	-21933000	USD
CY2019	us-gaap	Temporary Equity Other Changes TemporaryEquityOtherChanges	5525000	USD
CY2020Q4	us-gaap	Redeemable Noncontrolling Interest Equity Carrying Amount RedeemableNoncontrollingInterestEquityCarryingAmount	137720000	USD
CY2020	us-gaap	Revenue Recognition Leases RevenueRecognitionLeases	<div style="margin-top:14pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Leases</span></div><div style="margin-top:5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">We adopted ASC 842 effective January 1, 2019 under the modified retrospective approach and elected the optional transition method to apply the provisions of ASC 842 as of the adoption date, rather than the earliest period presented. We elected to apply certain adoption related practical expedients for all leases that commenced prior to the election date. These practical expedients included not reassessing whether any expired or existing contracts were or contained leases; not reassessing the lease classification for any expired or existing leases; and not reassessing initial direct costs for any existing leases. We also elected the practical expedient for lessors to combine our lease and non-lease components (primarily impacts common area maintenance recoveries). </span></div><div style="margin-top:9pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:400;line-height:120%">Lessor </span></div><div style="margin-top:5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">We recorded a charge to the opening accumulated dividends in excess of net income of $7.1 million in 2019 as a result of the adoption of ASC 842. This charge was attributable to the write off certain direct leasing costs recorded under the previous lease accounting rules for leases which had not commenced as well as the write off of unreserved receivables (including straight-line receivables) for leases where we had determined the collection of substantially all the lease payments required for the term is not probable. Also upon adoption of ASC 842 and reflected in our 2019 and 2020 financial statements, we do not record a gross up of revenue and expense for costs (such as real estate taxes) paid directly by lessees on our behalf. </span></div><div style="margin-top:9pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:400;line-height:120%">Lessee </span></div>We have ground leases at 12 properties which are accounted for as operating leases. The operating lease right of use ("ROU") assets and related liabilities are shown separately on the face of our consolidated balance sheet and reflect the present value of the minimum lease payments. A key input in the calculation is the discount rate. As the rate implied in the lease agreements is not readily determinable, we utilize our incremental borrowing rate that correspond to the remaining term of the lease, our credit spread, and and adjustment to reflect the collateralized payment terms present in the lease. Our operating lease agreements may include options to extend the lease term or terminate it early. We include options to extend or terminate leases in the ROU operating lease asset and liability when it is reasonably certain we will exercise these options. Operating lease expense is recognized on a straight-line basis over the non-cancellable lease term and is included in rental expenses in our consolidated statements of operations. We elected to apply the short-term lease exemption within ASC 842, and as such we have not recorded an ROU asset or lease liability for leases with terms of less than 12 months.
CY2020Q4	us-gaap	Number Of Properties Subject To Ground Leases NumberOfPropertiesSubjectToGroundLeases	12	properties
CY2020	frt	Minimum Percentage Of Taxable Income Distributed To Shareholders MinimumPercentageOfTaxableIncomeDistributedToShareholders	0.90
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0	USD
CY2020	frt	Numberof Properties Exceeding Segment Reporting Threshold NumberofPropertiesExceedingSegmentReportingThreshold	0	property
CY2020	us-gaap	Factors Used To Identify Entitys Reportable Segments FactorsUsedToIdentifyEntitysReportableSegments	10% of our revenues or property operating income
CY2020	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	1	segment
CY2020	us-gaap	Interest Costs Incurred InterestCostsIncurred	159718000	USD
CY2019	us-gaap	Interest Costs Incurred InterestCostsIncurred	130110000	USD
CY2018	us-gaap	Interest Costs Incurred InterestCostsIncurred	129001000	USD
CY2020	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	23429000	USD
CY2019	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	20487000	USD
CY2018	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	18847000	USD
CY2020	us-gaap	Interest Expense InterestExpense	136289000	USD
CY2019	us-gaap	Interest Expense InterestExpense	109623000	USD
CY2018	us-gaap	Interest Expense InterestExpense	110154000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	130248000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	106180000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	107494000	USD
CY2020	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	580000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	483000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	675000	USD
CY2020	frt	Valueofdown Reit Operating Partnership Units Issuedin Connectionwith Business Acquisition ValueofdownREITOperatingPartnershipUnitsIssuedinConnectionwithBusinessAcquisition	18920000	USD
CY2019	frt	Valueofdown Reit Operating Partnership Units Issuedin Connectionwith Business Acquisition ValueofdownREITOperatingPartnershipUnitsIssuedinConnectionwithBusinessAcquisition	0	USD
CY2018	frt	Valueofdown Reit Operating Partnership Units Issuedin Connectionwith Business Acquisition ValueofdownREITOperatingPartnershipUnitsIssuedinConnectionwithBusinessAcquisition	0	USD
CY2020	us-gaap	Noncash Or Part Noncash Acquisition Debt Assumed1 NoncashOrPartNoncashAcquisitionDebtAssumed1	8903000	USD
CY2019	us-gaap	Noncash Or Part Noncash Acquisition Debt Assumed1 NoncashOrPartNoncashAcquisitionDebtAssumed1	98041000	USD
CY2018	us-gaap	Noncash Or Part Noncash Acquisition Debt Assumed1 NoncashOrPartNoncashAcquisitionDebtAssumed1	0	USD
CY2020	frt	Redemptionofoperatingpartnershipunitsforcommonshares Redemptionofoperatingpartnershipunitsforcommonshares	0	USD
CY2019	frt	Redemptionofoperatingpartnershipunitsforcommonshares Redemptionofoperatingpartnershipunitsforcommonshares	14105000	USD
CY2018	frt	Redemptionofoperatingpartnershipunitsforcommonshares Redemptionofoperatingpartnershipunitsforcommonshares	101000	USD
CY2020	frt	Settlementofpartnerloanviadilution Settlementofpartnerloanviadilution	0	USD
CY2019	frt	Settlementofpartnerloanviadilution Settlementofpartnerloanviadilution	5379000	USD
CY2018	frt	Settlementofpartnerloanviadilution Settlementofpartnerloanviadilution	0	USD
CY2020	frt	Dividends Reinvested In Noncash Financing Transaction DividendsReinvestedInNoncashFinancingTransaction	1734000	USD
CY2019	frt	Dividends Reinvested In Noncash Financing Transaction DividendsReinvestedInNoncashFinancingTransaction	1784000	USD
CY2018	frt	Dividends Reinvested In Noncash Financing Transaction DividendsReinvestedInNoncashFinancingTransaction	1884000	USD
CY2020	frt	Noncashcontributionofnoncontrollinginterest Noncashcontributionofnoncontrollinginterest	0	USD
CY2019	frt	Noncashcontributionofnoncontrollinginterest Noncashcontributionofnoncontrollinginterest	0	USD
CY2018	frt	Noncashcontributionofnoncontrollinginterest Noncashcontributionofnoncontrollinginterest	1435000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	798329000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	127432000	USD
CY2020Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	18567000	USD
CY2019Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	26182000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	816896000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	153614000	USD
CY2020Q1	us-gaap	Units Of Partnership Interest Amount UnitsOfPartnershipInterestAmount	163322	shares
CY2020Q4	us-gaap	Property Plant And Equipment Fair Value Disclosure PropertyPlantAndEquipmentFairValueDisclosure	57000000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	78164000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	35851000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	83134000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	36195000	USD
CY2020Q4	frt	Finite Lived Intangible Liabilities Gross FiniteLivedIntangibleLiabilitiesGross	183666000	USD
CY2020Q4	frt	Finite Lived Intangible Liabilities Accumulated Amortization FiniteLivedIntangibleLiabilitiesAccumulatedAmortization	70402000	USD
CY2019Q4	frt	Finite Lived Intangible Liabilities Gross FiniteLivedIntangibleLiabilitiesGross	186596000	USD
CY2019Q4	frt	Finite Lived Intangible Liabilities Accumulated Amortization FiniteLivedIntangibleLiabilitiesAccumulatedAmortization	68009000	USD
CY2020	us-gaap	Amortization Of Below Market Lease AmortizationOfBelowMarketLease	8406000	USD
CY2019	us-gaap	Amortization Of Below Market Lease AmortizationOfBelowMarketLease	9623000	USD
CY2018	us-gaap	Amortization Of Below Market Lease AmortizationOfBelowMarketLease	12445000	USD
CY2020	us-gaap	Amortization Of Above And Below Market Leases AmortizationOfAboveAndBelowMarketLeases	4346000	USD
CY2019	us-gaap	Amortization Of Above And Below Market Leases AmortizationOfAboveAndBelowMarketLeases	6384000	USD
CY2018	us-gaap	Amortization Of Above And Below Market Leases AmortizationOfAboveAndBelowMarketLeases	6837000	USD
CY2020	frt	Amortizationof Below Market Lease Lessee AmortizationofBelowMarketLeaseLessee	828000	USD
CY2019	frt	Amortizationof Below Market Lease Lessee AmortizationofBelowMarketLeaseLessee	828000	USD
CY2018	frt	Amortizationof Below Market Lease Lessee AmortizationofBelowMarketLeaseLessee	828000	USD
CY2020	frt	Amortization Of Above And Below Market Leases Lessee AmortizationOfAboveAndBelowMarketLeasesLessee	303000	USD
CY2019	frt	Amortization Of Above And Below Market Leases Lessee AmortizationOfAboveAndBelowMarketLeasesLessee	303000	USD
CY2018	frt	Amortization Of Above And Below Market Leases Lessee AmortizationOfAboveAndBelowMarketLeasesLessee	323000	USD
CY2020Q4	us-gaap	Below Market Lease Amortization Income Next Twelve Months BelowMarketLeaseAmortizationIncomeNextTwelveMonths	7738000	USD
CY2020Q4	us-gaap	Below Market Lease Amortization Income Year Two BelowMarketLeaseAmortizationIncomeYearTwo	7501000	USD
CY2020Q4	us-gaap	Below Market Lease Amortization Income Year Three BelowMarketLeaseAmortizationIncomeYearThree	7253000	USD
CY2020Q4	us-gaap	Below Market Lease Amortization Income Year Four BelowMarketLeaseAmortizationIncomeYearFour	6784000	USD
CY2020Q4	us-gaap	Below Market Lease Amortization Income Year Five BelowMarketLeaseAmortizationIncomeYearFive	6300000	USD
CY2020Q4	us-gaap	Below Market Lease Amortization Income After Year Five BelowMarketLeaseAmortizationIncomeAfterYearFive	77688000	USD
CY2020Q4	us-gaap	Below Market Lease Net BelowMarketLeaseNet	113264000	USD
CY2020Q4	us-gaap	Secured Debt SecuredDebt	484111000	USD
CY2019Q4	us-gaap	Secured Debt SecuredDebt	545679000	USD
CY2020Q4	us-gaap	Line Of Credit LineOfCredit	0	USD
CY2019Q4	us-gaap	Line Of Credit LineOfCredit	0	USD
CY2020Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	494000	USD
CY2019Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	62000	USD
CY2020Q4	us-gaap	Notes Payable NotesPayable	402776000	USD
CY2019Q4	us-gaap	Notes Payable NotesPayable	3781000	USD
CY2020Q4	us-gaap	Senior Notes SeniorNotes	3404488000	USD
CY2019Q4	us-gaap	Senior Notes SeniorNotes	2807134000	USD
CY2020Q4	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	4291375000	USD
CY2019Q4	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	3356594000	USD
CY2020	us-gaap	Line Of Credit Facility Maximum Amount Outstanding During Period LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod	990000000.0	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	5800000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	5810000	USD
CY2020Q4	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	1000000000.0	USD
CY2020	us-gaap	Line Of Credit Facility Maximum Amount Outstanding During Period LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod	990000000.0	USD
CY2019	us-gaap	Line Of Credit Facility Maximum Amount Outstanding During Period LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod	116500000	USD
CY2018	us-gaap	Line Of Credit Facility Maximum Amount Outstanding During Period LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod	177000000.0	USD
CY2020	us-gaap	Line Of Credit Facility Average Outstanding Amount LineOfCreditFacilityAverageOutstandingAmount	138500000	USD
CY2019	us-gaap	Line Of Credit Facility Average Outstanding Amount LineOfCreditFacilityAverageOutstandingAmount	26800000	USD
CY2018	us-gaap	Line Of Credit Facility Average Outstanding Amount LineOfCreditFacilityAverageOutstandingAmount	83100000	USD
CY2020	frt	Lineofcreditfacilityweightedaverageinterestratebeforeamortizationofdebt Fees LineofcreditfacilityweightedaverageinterestratebeforeamortizationofdebtFees	0.015
CY2019	frt	Lineofcreditfacilityweightedaverageinterestratebeforeamortizationofdebt Fees LineofcreditfacilityweightedaverageinterestratebeforeamortizationofdebtFees	0.032
CY2018	frt	Lineofcreditfacilityweightedaverageinterestratebeforeamortizationofdebt Fees LineofcreditfacilityweightedaverageinterestratebeforeamortizationofdebtFees	0.027
CY2020Q4	frt	Lineofcreditfacilityannualfacilityfee Lineofcreditfacilityannualfacilityfee	1000000.0	USD
CY2020Q4	us-gaap	Line Of Credit LineOfCredit	0	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	428777000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	120457000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	279314000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	604344000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	48366000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	2827247000	USD
CY2020Q4	us-gaap	Long Term Debt LongTermDebt	4308505000	USD
CY2020Q4	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	1000000000.0	USD
CY2020Q4	us-gaap	Line Of Credit LineOfCredit	0	USD
CY2020	us-gaap	Increase Decrease In Derivative Assets IncreaseDecreaseInDerivativeAssets	4800000	USD
CY2020	us-gaap	Interest Rate Cash Flow Hedge Gain Loss Reclassified To Earnings Net InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet	-700000	USD
CY2020Q4	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	4600000	USD
CY2019Q4	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	3000000.0	USD
CY2020	us-gaap	Product Warranty Accrual Payments ProductWarrantyAccrualPayments	800000	USD
CY2019	us-gaap	Product Warranty Accrual Payments ProductWarrantyAccrualPayments	1300000	USD
CY2020Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	4700000	USD
CY2020Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	5077000	USD
CY2020Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	5197000	USD
CY2020Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	5243000	USD
CY2020Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	5213000	USD
CY2020Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	5084000	USD
CY2020Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	175387000	USD
CY2020Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	201201000	USD
CY2020Q4	frt	Operating Lease Liability Future Minimum Interest Payments OperatingLeaseLiabilityFutureMinimumInterestPayments	128760000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	72441000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	60013000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	1013000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	1013000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	80837000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	154486000	USD
CY2020Q4	frt	Financeleaseliabilityfutureminimuminterestpayments Financeleaseliabilityfutureminimuminterestpayments	82437000	USD
CY2020Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	72049000	USD
CY2020Q4	us-gaap	Partners Capital Account Units PartnersCapitalAccountUnits	744617	shares
CY2020Q4	frt	Operating Partnership Units Fair Value OperatingPartnershipUnitsFairValue	63400000	USD
CY2020	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	24491	shares
CY2019	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	15909	shares
CY2018	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	17952	shares
CY2020	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	4.220
CY2020	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	4.210
CY2019	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	4.140
CY2019	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	4.110
CY2018	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	4.040
CY2018	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	4.020
CY2020	frt	Common Stock Ordinary Dividends Per Share Cash Paid CommonStockOrdinaryDividendsPerShareCashPaid	3.452
CY2019	frt	Common Stock Ordinary Dividends Per Share Cash Paid CommonStockOrdinaryDividendsPerShareCashPaid	4.110
CY2018	frt	Common Stock Ordinary Dividends Per Share Cash Paid CommonStockOrdinaryDividendsPerShareCashPaid	3.859
CY2020	frt	Common Shares Return Of Capital CommonSharesReturnOfCapital	0.758
CY2019	frt	Common Shares Return Of Capital CommonSharesReturnOfCapital	0
CY2018	frt	Common Shares Return Of Capital CommonSharesReturnOfCapital	0
CY2020	frt	Common Stock Ordinary Dividends Eligible For15 Percent Tax Rate Per Share Cash Paid CommonStockOrdinaryDividendsEligibleFor15PercentTaxRatePerShareCashPaid	0
CY2019	frt	Common Stock Ordinary Dividends Eligible For15 Percent Tax Rate Per Share Cash Paid CommonStockOrdinaryDividendsEligibleFor15PercentTaxRatePerShareCashPaid	0
CY2018	frt	Common Stock Ordinary Dividends Eligible For15 Percent Tax Rate Per Share Cash Paid CommonStockOrdinaryDividendsEligibleFor15PercentTaxRatePerShareCashPaid	0.161
CY2020	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	4.210
CY2019	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	4.110
CY2018	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	4.020
CY2020Q4	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.06
CY2020Q4	us-gaap	Number Of Real Estate Properties NumberOfRealEstateProperties	101	project
CY2020Q4	us-gaap	Number Of States In Which Entity Operates NumberOfStatesInWhichEntityOperates	11	state
CY2020Q4	frt	Percent Of Annualized Base Rent Maximum PercentOfAnnualizedBaseRentMaximum	0.036
CY2020Q4	us-gaap	Operating Leases Future Minimum Payments Receivable Current OperatingLeasesFutureMinimumPaymentsReceivableCurrent	586082000	USD
CY2020Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Two Years OperatingLeasesFutureMinimumPaymentsReceivableInTwoYears	549529000	USD
CY2020Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Three Years OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears	486269000	USD
CY2020Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Four Years OperatingLeasesFutureMinimumPaymentsReceivableInFourYears	421945000	USD
CY2020Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Five Years OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears	349671000	USD
CY2020Q4	us-gaap	Operating Leases Future Minimum Payments Receivable Thereafter OperatingLeasesFutureMinimumPaymentsReceivableThereafter	1493377000	USD
CY2020Q4	us-gaap	Operating Leases Future Minimum Payments Receivable OperatingLeasesFutureMinimumPaymentsReceivable	3886873000	USD
CY2020	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	1284000	USD
CY2019	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	1284000	USD
CY2020	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	5826000	USD
CY2019	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	5824000	USD
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	5946000	USD
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	6063000	USD
CY2020	us-gaap	Variable Lease Cost VariableLeaseCost	353000	USD
CY2019	us-gaap	Variable Lease Cost VariableLeaseCost	487000	USD
CY2020	us-gaap	Lease Cost LeaseCost	13409000	USD
CY2019	us-gaap	Lease Cost LeaseCost	13658000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	855000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	0	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	0	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	0	USD
CY2020	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	5736000	USD
CY2019	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	5759000	USD
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	5498000	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	5561000	USD
CY2020	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	46000	USD
CY2019	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	47000	USD
CY2020Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P17Y3M18D
CY2019Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P18Y2M12D
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P53Y4M24D
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P53Y8M12D
CY2020Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.080
CY2019Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.080
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.044
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.045
CY2020	us-gaap	Cost Of Property Repairs And Maintenance CostOfPropertyRepairsAndMaintenance	66845000	USD
CY2019	us-gaap	Cost Of Property Repairs And Maintenance CostOfPropertyRepairsAndMaintenance	73179000	USD
CY2018	us-gaap	Cost Of Property Repairs And Maintenance CostOfPropertyRepairsAndMaintenance	67745000	USD
CY2020	us-gaap	Utilities Operating Expense UtilitiesOperatingExpense	25065000	USD
CY2019	us-gaap	Utilities Operating Expense UtilitiesOperatingExpense	27729000	USD
CY2018	us-gaap	Utilities Operating Expense UtilitiesOperatingExpense	27635000	USD
CY2020	us-gaap	Management Fee Expense ManagementFeeExpense	23752000	USD
CY2019	us-gaap	Management Fee Expense ManagementFeeExpense	24930000	USD
CY2018	us-gaap	Management Fee Expense ManagementFeeExpense	24024000	USD
CY2020	frt	Property Payroll Expense PropertyPayrollExpense	16691000	USD
CY2019	frt	Property Payroll Expense PropertyPayrollExpense	16485000	USD
CY2018	frt	Property Payroll Expense PropertyPayrollExpense	16140000	USD
CY2020	us-gaap	Real Estate Insurance RealEstateInsurance	12439000	USD
CY2019	us-gaap	Real Estate Insurance RealEstateInsurance	9036000	USD
CY2018	us-gaap	Real Estate Insurance RealEstateInsurance	7547000	USD
CY2020	us-gaap	Marketing Expense MarketingExpense	6432000	USD
CY2019	us-gaap	Marketing Expense MarketingExpense	7427000	USD
CY2018	us-gaap	Marketing Expense MarketingExpense	7935000	USD
CY2020	frt	Ground Rent Expense GroundRentExpense	4595000	USD
CY2019	frt	Ground Rent Expense GroundRentExpense	4803000	USD
CY2018	frt	Ground Rent Expense GroundRentExpense	4697000	USD
CY2020	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	0	USD
CY2019	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	0	USD
CY2018	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	4708000	USD
CY2020	us-gaap	Other Cost Of Operating Revenue OtherCostOfOperatingRevenue	15101000	USD
CY2019	us-gaap	Other Cost Of Operating Revenue OtherCostOfOperatingRevenue	24242000	USD
CY2018	us-gaap	Other Cost Of Operating Revenue OtherCostOfOperatingRevenue	12663000	USD
CY2020	us-gaap	Direct Costs Of Leased And Rented Property Or Equipment DirectCostsOfLeasedAndRentedPropertyOrEquipment	170920000	USD
CY2019	us-gaap	Direct Costs Of Leased And Rented Property Or Equipment DirectCostsOfLeasedAndRentedPropertyOrEquipment	187831000	USD
CY2018	us-gaap	Direct Costs Of Leased And Rented Property Or Equipment DirectCostsOfLeasedAndRentedPropertyOrEquipment	173094000	USD
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.028
CY2020	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	13243000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	13330000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	12736000	USD
CY2020	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	1319000	USD
CY2019	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	1054000	USD
CY2018	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	1017000	USD
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	11924000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	12276000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	11719000	USD
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	0	shares
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	0	shares
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.180
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.036
CY2018	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P7Y6M
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	682	shares
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	152.34
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	0	shares
CY2020	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	0
CY2020	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	0	shares
CY2020	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	0
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	0	shares
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice	0
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	682	shares
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	152.34
CY2020	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P5Y1M6D
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	0	USD
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	546	shares
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	152.34
CY2020	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P5Y1M6D
CY2020Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	0	USD
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	14.42
CY2018	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	4600000	USD
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	8200000	USD
CY2020Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	17000000.0	USD
CY2020	frt	Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition Years ShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognitionYears	P5Y3M18D
CY2020	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P2Y1M6D
CY2019	us-gaap	Incremental Common Shares Attributable To Participating Nonvested Shares With Non Forfeitable Dividend Rights IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights	200000	shares
CY2020	us-gaap	Incremental Common Shares Attributable To Participating Nonvested Shares With Non Forfeitable Dividend Rights IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights	200000	shares
CY2018	us-gaap	Incremental Common Shares Attributable To Participating Nonvested Shares With Non Forfeitable Dividend Rights IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights	200000	shares
CY2020	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	682	shares
CY2019	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	682	shares
CY2018	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	682	shares
CY2020	us-gaap	Profit Loss ProfitLoss	135888000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	360542000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	249026000	USD
CY2020	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	8042000	USD
CY2019	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	8042000	USD
CY2018	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	8042000	USD
CY2020	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	4182000	USD
CY2019	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	6676000	USD
CY2018	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	7119000	USD
CY2020	frt	Earnings Allocated To Unvested Shares EarningsAllocatedToUnvestedShares	992000	USD
CY2019	frt	Earnings Allocated To Unvested Shares EarningsAllocatedToUnvestedShares	1007000	USD
CY2018	frt	Earnings Allocated To Unvested Shares EarningsAllocatedToUnvestedShares	930000	USD
CY2020	frt	Net Income Available For Common Shareholders Basic And Diluted NetIncomeAvailableForCommonShareholdersBasicAndDiluted	122672000	USD
CY2019	frt	Net Income Available For Common Shareholders Basic And Diluted NetIncomeAvailableForCommonShareholdersBasicAndDiluted	344817000	USD
CY2018	frt	Net Income Available For Common Shareholders Basic And Diluted NetIncomeAvailableForCommonShareholdersBasicAndDiluted	232935000	USD
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	75515000	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	74766000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	73274000	shares
CY2020	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	0	shares
CY2019	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	0	shares
CY2018	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	28000	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	75515000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	74766000	shares
CY2018	frt	Real Estate Accumulated Depreciation Dispositions And Retirements RealEstateAccumulatedDepreciationDispositionsAndRetirements	33370000	USD
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	73302000	shares
CY2020	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	1.62
CY2019	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	4.61
CY2018	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	3.18
CY2020Q4	srt	Real Estate And Accumulated Depreciation Amount Of Encumbrances RealEstateAndAccumulatedDepreciationAmountOfEncumbrances	484111000	USD
CY2020Q4	us-gaap	Real Estate And Accumulated Depreciation Initial Cost Of Land RealEstateAndAccumulatedDepreciationInitialCostOfLand	1387748000	USD
CY2020Q4	us-gaap	Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements	2493283000	USD
CY2020Q4	us-gaap	Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Carrying Costs RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts	4701839000	USD
CY2020Q4	us-gaap	Real Estate And Accumulated Depreciation Carrying Amount Of Land RealEstateAndAccumulatedDepreciationCarryingAmountOfLand	1374797000	USD
CY2020Q4	us-gaap	Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements	7208073000	USD
CY2020Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	8582870000	USD
CY2020Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	2357692000	USD
CY2017Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	7635061000	USD
CY2018	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	14940000	USD
CY2018	us-gaap	Real Estate Improvements RealEstateImprovements	407225000	USD
CY2018	frt	Real Estate Dispositions And Retirements RealEstateDispositionsAndRetirements	237754000	USD
CY2018Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	7819472000	USD
CY2019	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	309921000	USD
CY2019	us-gaap	Real Estate Improvements RealEstateImprovements	441703000	USD
CY2019	frt	Real Estate Dispositions And Retirements RealEstateDispositionsAndRetirements	201105000	USD
CY2019Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	8298132000	USD
CY2020	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	39440000	USD
CY2020	us-gaap	Real Estate Improvements RealEstateImprovements	473679000	USD
CY2020	frt	Impairment Of Property ImpairmentOfProperty	68484000	USD
CY2020	frt	Real Estate Dispositions And Retirements RealEstateDispositionsAndRetirements	159897000	USD
CY2020Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	8582870000	USD
CY2020Q4	srt	Real Estate Federal Income Tax Basis RealEstateFederalIncomeTaxBasis	7700000000	USD
CY2017Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	1876544000	USD
CY2018	us-gaap	Sec Schedule Iii Real Estate Accumulated Depreciation Depreciation Expense SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense	215969000	USD
CY2018Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	2059143000	USD
CY2019	us-gaap	Sec Schedule Iii Real Estate Accumulated Depreciation Depreciation Expense SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense	215382000	USD
CY2019	frt	Real Estate Accumulated Depreciation Dispositions And Retirements RealEstateAccumulatedDepreciationDispositionsAndRetirements	40939000	USD
CY2019Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	2215413000	USD
CY2020	us-gaap	Sec Schedule Iii Real Estate Accumulated Depreciation Depreciation Expense SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense	229199000	USD
CY2020	frt	Real Estate Accumulated Depreciation Impairment Of Property RealEstateAccumulatedDepreciationImpairmentOfProperty	11631000	USD
CY2020	frt	Real Estate Accumulated Depreciation Dispositions And Retirements RealEstateAccumulatedDepreciationDispositionsAndRetirements	75289000	USD
CY2020Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	2357692000	USD
CY2020Q4	srt	Mortgage Loans On Real Estate Prior Liens1 MortgageLoansOnRealEstatePriorLiens1	58750000	USD
CY2020Q4	srt	Mortgage Loans On Real Estate Face Amount Of Mortgages MortgageLoansOnRealEstateFaceAmountOfMortgages	40697000	USD
CY2020Q4	us-gaap	Mortgage Loans On Real Estate MortgageLoansOnRealEstate	39892000	USD
CY2020Q4	srt	Mortgage Loans On Real Estate Principal Amount Of Delinquent Loans MortgageLoansOnRealEstatePrincipalAmountOfDelinquentLoans	30332000	USD
CY2020Q4	srt	Mortgage Loans On Real Estate Federal Income Tax Basis1 MortgageLoansOnRealEstateFederalIncomeTaxBasis1	40700000	USD
CY2020Q4	srt	Mortgage Loans On Real Estate Prior Liens1 MortgageLoansOnRealEstatePriorLiens1	58800000	USD
CY2018Q4	us-gaap	Mortgage Loans On Real Estate MortgageLoansOnRealEstate	30429000	USD
CY2017Q4	us-gaap	Mortgage Loans On Real Estate MortgageLoansOnRealEstate	30429000	USD
CY2019Q4	us-gaap	Mortgage Loans On Real Estate MortgageLoansOnRealEstate	30429000	USD
CY2020	frt	January12020 Adoption Of New Accounting Standard January12020AdoptionOfNewAccountingStandard	790000	USD
CY2020	frt	Acquisitions Of Loans Net Of Valuation Adjustements AcquisitionsOfLoansNetOfValuationAdjustements	9560000	USD
CY2020	us-gaap	Mortgage Loans On Real Estate New Mortgage Loans MortgageLoansOnRealEstateNewMortgageLoans	693000	USD
CY2020Q4	us-gaap	Mortgage Loans On Real Estate MortgageLoansOnRealEstate	39892000	USD

Files In Submission

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$FRT
Federal Realty Investment Trust Stock $frt

2020 Q4 Form 10-K Financial Statement

#000003490321000020 Filed on February 11, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$FRT Federal Realty Investment Trust Stock $frt

2020 Q4 Form 10-K Financial Statement

#000003490321000020 Filed on February 11, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$FRT
Federal Realty Investment Trust Stock $frt