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Derivative Instruments And Hedging Activities (Fair Value Of Derivative Financial Instruments And Their Classification In The Balance Sheet) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Derivatives, Fair Value [Line Items]    
Asset Derivatives, Fair Value $ 0.1  
Derivatives Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member]
   
Derivatives, Fair Value [Line Items]    
Liability Derivatives, Fair Value    36.9
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member]
   
Derivatives, Fair Value [Line Items]    
Liability Derivatives, Fair Value 16.6   
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Cap [Member]
   
Derivatives, Fair Value [Line Items]    
Asset Derivatives, Fair Value $ 0.1