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(Common Units) (Narrative) (Details)
$ / shares in Units, $ in Millions
9 Months Ended
Feb. 06, 2020
USD ($)
shares
Sep. 30, 2020
USD ($)
yr
$ / shares
shares
MYLTIP 2017 [Member]    
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]    
Final awards percentage of target 83.80%  
Value of MYLTIP Awards | $ $ 17.6  
MYLTIP Units forfeited 270,942  
OP Units [Member]    
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]    
OP Units for redemption (in shares)   773,858
Redemption of OP units issued on conversion of LTIP, OPP and MYLTIP units (in shares)   82,608
MYLTIP Units distribution as percentage of OP Unit distribution prior to measurement date   10.00%
Restriction on redemption of OP Unit to Common Stock (in years) | yr   1
Redemption of OP Unit equivalent to Common Stock (in shares)   1
Common units of operating partnership if converted value | $   $ 1,400.0
Closing price of common stock (in dollars per share) | $ / shares   $ 80.30