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Debt (Debt Repayments) (Details) (USD $)
In Millions, unless otherwise specified
 0 Months Ended
Jun. 03, 2014
Dec. 10, 2014
Dec. 12, 2014
Melville Mall      
Debt Instrument [Line Items]      
Repayments of debt $ 20.3us-gaap_RepaymentsOfDebt
/ us-gaap_DebtInstrumentAxis
= frt_MelvilleMallMember		    
East Bay Bridge      
Debt Instrument [Line Items]      
Accrued but unpaid interest   0.1us-gaap_InterestPaid
/ us-gaap_DebtInstrumentAxis
= frt_EastBayBridgeMember		 [1]  
RepaymentSecuredDebtIncludingPrepaymentPenalty   64.0frt_RepaymentSecuredDebtIncludingPrepaymentPenalty
/ us-gaap_DebtInstrumentAxis
= frt_EastBayBridgeMember		  
Prepayment premium on mortgage loan   3.0frt_PrepaymentPremiumonMortgageLoan
/ us-gaap_DebtInstrumentAxis
= frt_EastBayBridgeMember		  
Repayments of debt   61.0us-gaap_RepaymentsOfDebt
/ us-gaap_DebtInstrumentAxis
= frt_EastBayBridgeMember		 [1]  
5.65% notes      
Debt Instrument [Line Items]      
Accrued but unpaid interest     0.2us-gaap_InterestPaid
/ us-gaap_DebtInstrumentAxis
= frt_Senior5Point65PercentNotesMember
Repayments of debt     $ 125.0us-gaap_RepaymentsOfDebt
/ us-gaap_DebtInstrumentAxis
= frt_Senior5Point65PercentNotesMember		 [2]
[1] The total amount due at payoff of $64.0 million included a prepayment premium of $3.0 million and accrued but unpaid interest of $0.1 million. The prepayment premium is included in "early extinguishment of debt" in 2014
[2] The redemption price of $134.5 million included a make-whole premium of approximately $9.2 million and accrued but unpaid interest of $0.2 million. The make-whole premium is included in "early extinguishment of debt" in 2014.