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Real Estate (Tenant Reimbursements) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Operating Lease Income        
Real Estate Properties [Line Items]        
Tenant reimbursements $ 6.2 $ 6.8 $ 18.4 $ 20.4