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Revolving Credit Facilities and Term Loan (Tables)
9 Months Ended
Sep. 30, 2011
Revolving Credit Facilities and Term Loan/Senior Notes [Abstract] 
Information Regarding the Company's Revolving Credit Facilities and Term Loan

                         
    Carrying Value at     Weighted-Average
Interest Rate at
       
    September 30, 2011     September 30, 2011     Maturity Date  

Unsecured indebtedness:

                       

Unsecured Credit Facility

  $ 214.9       2.3     February 2016  

PNC Facility

    11.5       1.9     February 2016  

Secured indebtedness:

                       

Term loan

    500.0       3.0     September 2014