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REAL ESTATE - Corporate Technology Centre - 100 Headquarters and 200 Holger (Details)
$ in Millions
12 Months Ended
Jun. 25, 2020
USD ($)
ft²
numberOfProperties
Dec. 31, 2018
numberOfProperties
Jun. 30, 2020
numberOfProperties
Jan. 31, 2020
numberOfProperties
Nov. 13, 2019
numberOfProperties
Mar. 28, 2013
ft²
a
numberOfProperties
Real Estate Properties [Line Items]            
Number of real estate properties         7  
Office Campus            
Real Estate Properties [Line Items]            
Number of real estate properties     1 1    
Office Properties            
Real Estate Properties [Line Items]            
Number of real estate properties     4      
Office Properties | Corporate Technology Centre | Disposed of by Sale            
Real Estate Properties [Line Items]            
Number of real estate properties sold 2 3        
Consideration | $ $ 95.2          
Consideration, net of credits | $ 68.5          
Closing cost | $ $ 0.9          
Office Properties | 100 Headquarters | Disposed of by Sale            
Real Estate Properties [Line Items]            
Net rentable area | ft² 46,070          
Office Properties | 200 Holger | Disposed of by Sale            
Real Estate Properties [Line Items]            
Net rentable area | ft² 96,640          
Corporate Technology Centre | Office Campus            
Real Estate Properties [Line Items]            
Number of real estate properties           1
Corporate Technology Centre | Office Properties            
Real Estate Properties [Line Items]            
Number of real estate properties           8
Net rentable area | ft²           610,083
Area of land | a           32.7