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Acquisitions, Dispositions, Discontinued Operations and Assets Held for Sale (Narrative) (Details)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Apr. 28, 2017
USD ($)
a
Apr. 30, 2016
USD ($)
Feb. 29, 2016
USD ($)
a
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Apr. 26, 2016
a
Area of Land | a     2.0      
Payments to Acquire Land       $ 4.1    
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax         $ 375.2  
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]            
Area of Land | a     6.3      
Sales price of land     $ 2.2      
Gain on sale of land       $ 0.4    
Subsequent Event [Member]            
Area of Land | a 8.2          
Payments to Acquire Land $ 20.0          
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member]            
Area of Land | a           19.6
Number of Units in Real Estate Property           4,918
Proceeds from sales of operating properties   $ 630.0        
Number of operating properties sold           15
Weighted average age of operating properties           23