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Summary Of Significant Accounting Policies (Revenue Recognition and Accounts Receivable) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
condominiums
Dec. 31, 2017
USD ($)
Accounting Policies [Abstract]    
Allowance for doubtful accounts $ 12.7 $ 11.8
Collection of accounts receivable, period 1 year  
Accounts receivable related to straight-line rents $ 97.4 $ 93.1
Condominiums | Assembly Row and Pike & Rose    
Real estate property    
Number of Units in Real Estate Property | condominiums 221