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Gain on Sales of Real Estate (Details) - New properties and properties under development
$ in Millions
3 Months Ended
Mar. 31, 2016
USD ($)
property
Mar. 31, 2015
USD ($)
property
Sales of investment properties    
Number of properties sold | property 11 9
Sales proceeds $ 11.0 $ 22.3
Gain on sales of investment properties $ 2.3 $ 7.2