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Variable Interest Entities (Details) (USD $)
In Millions, unless otherwise specified
1 Months Ended
Jun. 30, 2011
Sep. 30, 2011
Dec. 31, 2010
Eye Street 1201 NW Associates LLC [Member]
   
Variable Interest Entity [Line Items]   
Net Carrying Amount $ (1.6)$ 0.3
Piedmont’s % Ownership of Entity49.50%  
Variable Interst Entity, Cash Flow Percent Entitled To Entity 100.00% 
Eye Street 1225 NW Associates LLC [Member]
   
Variable Interest Entity [Line Items]   
Net Carrying Amount 1.11.9
Piedmont’s % Ownership of Entity49.50%  
Variable Interst Entity, Cash Flow Percent Entitled To Entity 100.00% 
Piedmont 500 W. Monroe Fee LLC [Member]
   
Variable Interest Entity [Line Items]   
Net Carrying Amount 43.7 
Piedmont’s % Ownership of Entity100.00%  
Suwanee Gateway One LLC [Member]
   
Variable Interest Entity [Line Items]   
Net Carrying Amount 7.77.8
Piedmont’s % Ownership of Entity100.00%  
Medici Atlanta LLC [Member]
   
Variable Interest Entity [Line Items]   
Net Carrying Amount $ 13.0 
Piedmont’s % Ownership of Entity100.00%