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Real Estate (Tenant Reimbursements) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Real Estate [Abstract]        
Customer reimbursements $ 9.1 $ 6.5 $ 24.8 $ 21.4