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Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Carrying value per balance sheet    
Fair value of financial assets and liabilities    
Notes receivable issued in connection with property sales $ 18.0 $ 18.3
Mortgages payable assumed in connection with acquisitions, net 706.1 852.6
Notes and bonds payable, net of unamortized original issuance discounts 3,786.4 3,785.4
Estimated fair value    
Fair value of financial assets and liabilities    
Notes receivable issued in connection with property sales 19.7 20.1
Mortgages payable assumed in connection with acquisitions, net 713.4 857.9
Notes and bonds payable, net of unamortized original issuance discounts $ 4,001.0 $ 4,092.8