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Gain on Sales of Real Estate (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
property
Jun. 30, 2016
USD ($)
property
Jun. 30, 2017
USD ($)
property
Jun. 30, 2016
USD ($)
property
Gain on Sales of Real Estate        
Property Sales Count | property 15 16 29 27
Sales proceeds $ 12.8 $ 24.5 $ 44.0 $ 35.5
Gain on sales of properties $ 2.8 $ 8.7 $ 13.4 $ 10.9