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Derivative Instruments And Hedging Activities (Tables)
12 Months Ended
Dec. 31, 2011
Derivative [Line Items]  
Fair Value Of Derivative Financial Instruments And Their Classification In The Balance Sheet
September 30, September 30, September 30, September 30, September 30, September 30, September 30, September 30, September 30,
    Fair Values of Derivative Instruments                          
    Asset Derivatives     Liability Derivatives  
    2011     2010     2011     2010  
    Balance
Sheet
Location
    Fair
Value
    Balance
Sheet
Location
    Fair
Value
    Balance
Sheet
Location
    Fair
Value
    Balance
Sheet
Location
    Fair
Value
 

Derivatives designated as hedging instruments

               

Interest Rate Swaps

            Other Liabilities      $ —          Other Liabilities      $ 36.9   

Derivatives designated not as hedging instruments

               

Interest Rate Swap

            Other Liabilities      $ 16.6        Other Liabilities      $ —     

Interest Rate Cap

    Other Assets      $ 0.1        Other Assets      $ —             
Effect Of Derivative Financial Instruments On The Statements Of Income And Comprehensive Income
Not-Designated [Member]
 
Derivative [Line Items]  
Schedule Of Outstanding Interest Rate Derivatives
September 30, September 30,

Interest Rate Derivative

     Number of Instruments      Notional Amount

Interest Rate Cap

     1      $175.0 million

Interest Rate Swap

     1      $500.0 million