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Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Level 2 | Accounts payable and accrued expenses | Interest rate swaps    
Fair value of financial assets and liabilities    
Fair value of interest rate swaps $ 9.7  
Carrying value per balance sheet    
Fair value of financial assets and liabilities    
Notes receivable issued in connection with property sales 5.4 $ 17.9
Mortgages payable assumed in connection with acquisitions, net 503.2 646.2
Notes and bonds payable, net 3,346.4 3,618.0
Estimated fair value    
Fair value of financial assets and liabilities    
Notes receivable issued in connection with property sales 5.6 19.4
Mortgages payable assumed in connection with acquisitions, net 512.7 651.5
Notes and bonds payable, net $ 3,695.7 $ 3,828.1