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Acquisitions and Sales (Land Parcels) (Details)
$ in Millions
1 Months Ended 12 Months Ended
Nov. 30, 2019
USD ($)
Dec. 31, 2020
USD ($)
a
Dec. 31, 2019
USD ($)
a
Construction in Progress      
Property, Plant and Equipment [Line Items]      
Acres of land | a   126 107
Payments to acquire land   $ 43.9 $ 31.6
Atlanta Building Sale      
Property, Plant and Equipment [Line Items]      
Gain on sale of property $ 1.4    
Lease term of facility with global cloud-based software company   20 years