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Financial Instruments - Information Regarding Swaps (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Derivative [Line Items]    
Aggregate Notional Amount of Interest Rate Derivatives $ 530.0invest_DerivativeNotionalAmount $ 631.4invest_DerivativeNotionalAmount
Accounts Payable [Member]    
Derivative [Line Items]    
Liability (5.0)us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_AccountsPayableMember
(6.0)us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_AccountsPayableMember
Other Assets [Member]    
Derivative [Line Items]    
Asset 0.7us-gaap_DerivativeAssets
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
2.8us-gaap_DerivativeAssets
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
Interest Rate Swaps One [Member]    
Derivative [Line Items]    
Maturity Date Jun. 28, 2014  
Counterparty Pays Variable Rate 1 Month LIBOR  
Fixed Rate 1.00%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeByNatureAxis
= ddr_InterestRateSwapsOneMember
 
Asset   0us-gaap_DerivativeAssets
/ us-gaap_DerivativeByNatureAxis
= ddr_InterestRateSwapsOneMember
Liability   (0.4)us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeByNatureAxis
= ddr_InterestRateSwapsOneMember
Interest Rate Swaps Two [Member]    
Derivative [Line Items]    
Maturity Date Jun. 01, 2015  
Aggregate Notional Amount of Interest Rate Derivatives 50.0invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= ddr_InterestRateSwapsTwoMember
 
Counterparty Pays Variable Rate 1 Month LIBOR  
Fixed Rate 0.60%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeByNatureAxis
= ddr_InterestRateSwapsTwoMember
 
Asset 0us-gaap_DerivativeAssets
/ us-gaap_DerivativeByNatureAxis
= ddr_InterestRateSwapsTwoMember
0us-gaap_DerivativeAssets
/ us-gaap_DerivativeByNatureAxis
= ddr_InterestRateSwapsTwoMember
Liability (0.1)us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeByNatureAxis
= ddr_InterestRateSwapsTwoMember
(0.2)us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeByNatureAxis
= ddr_InterestRateSwapsTwoMember
Interest Rate Swaps Three [Member]    
Derivative [Line Items]    
Maturity Date Jul. 01, 2015  
Aggregate Notional Amount of Interest Rate Derivatives 100.0invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= ddr_InterestRateSwapsThreeMember
 
Counterparty Pays Variable Rate 1 Month LIBOR  
Fixed Rate 0.50%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeByNatureAxis
= ddr_InterestRateSwapsThreeMember
 
Asset 0us-gaap_DerivativeAssets
/ us-gaap_DerivativeByNatureAxis
= ddr_InterestRateSwapsThreeMember
0us-gaap_DerivativeAssets
/ us-gaap_DerivativeByNatureAxis
= ddr_InterestRateSwapsThreeMember
Liability (0.2)us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeByNatureAxis
= ddr_InterestRateSwapsThreeMember
(0.4)us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeByNatureAxis
= ddr_InterestRateSwapsThreeMember
Interest Rate Swaps Four [Member]    
Derivative [Line Items]    
Maturity Date Sep. 01, 2017  
Aggregate Notional Amount of Interest Rate Derivatives 80.0invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= ddr_InterestRateSwapsFourMember
 
Counterparty Pays Variable Rate 1 Month LIBOR  
Fixed Rate 2.80%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeByNatureAxis
= ddr_InterestRateSwapsFourMember
 
Asset 0us-gaap_DerivativeAssets
/ us-gaap_DerivativeByNatureAxis
= ddr_InterestRateSwapsFourMember
0us-gaap_DerivativeAssets
/ us-gaap_DerivativeByNatureAxis
= ddr_InterestRateSwapsFourMember
Liability (3.8)us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeByNatureAxis
= ddr_InterestRateSwapsFourMember
(5.0)us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeByNatureAxis
= ddr_InterestRateSwapsFourMember
Interest Rate Swaps Five [Member]    
Derivative [Line Items]    
Maturity Date Jan. 02, 2018  
Aggregate Notional Amount of Interest Rate Derivatives 100.0invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= ddr_InterestRateSwapsFiveMember
 
Counterparty Pays Variable Rate 1 Month LIBOR  
Fixed Rate 0.90%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeByNatureAxis
= ddr_InterestRateSwapsFiveMember
 
Asset 0.7us-gaap_DerivativeAssets
/ us-gaap_DerivativeByNatureAxis
= ddr_InterestRateSwapsFiveMember
1.4us-gaap_DerivativeAssets
/ us-gaap_DerivativeByNatureAxis
= ddr_InterestRateSwapsFiveMember
Liability 0us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeByNatureAxis
= ddr_InterestRateSwapsFiveMember
0us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeByNatureAxis
= ddr_InterestRateSwapsFiveMember
Interest Rate Swaps Six [Member]    
Derivative [Line Items]    
Maturity Date Feb. 01, 2019  
Aggregate Notional Amount of Interest Rate Derivatives 100.0invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= ddr_InterestRateSwapsSixMember
 
Counterparty Pays Variable Rate 1 Month LIBOR  
Fixed Rate 1.60%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeByNatureAxis
= ddr_InterestRateSwapsSixMember
 
Asset 0us-gaap_DerivativeAssets
/ us-gaap_DerivativeByNatureAxis
= ddr_InterestRateSwapsSixMember
0.5us-gaap_DerivativeAssets
/ us-gaap_DerivativeByNatureAxis
= ddr_InterestRateSwapsSixMember
Liability (0.6)us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeByNatureAxis
= ddr_InterestRateSwapsSixMember
0us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeByNatureAxis
= ddr_InterestRateSwapsSixMember
Interest Rate Swaps Seven [Member]    
Derivative [Line Items]    
Maturity Date Feb. 01, 2019  
Aggregate Notional Amount of Interest Rate Derivatives 100.0invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= ddr_InterestRateSwapSevenMember
 
Counterparty Pays Variable Rate 1 Month LIBOR  
Fixed Rate 1.50%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeByNatureAxis
= ddr_InterestRateSwapSevenMember
 
Asset 0us-gaap_DerivativeAssets
/ us-gaap_DerivativeByNatureAxis
= ddr_InterestRateSwapSevenMember
0.9us-gaap_DerivativeAssets
/ us-gaap_DerivativeByNatureAxis
= ddr_InterestRateSwapSevenMember
Liability $ (0.3)us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeByNatureAxis
= ddr_InterestRateSwapSevenMember
$ 0us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeByNatureAxis
= ddr_InterestRateSwapSevenMember