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Real Estate (Held for Sale) (Details)
$ in Millions
1 Months Ended 3 Months Ended
Sep. 16, 2019
USD ($)
property
Jan. 31, 2020
USD ($)
property
Mar. 31, 2020
Dec. 31, 2019
USD ($)
property
Business Acquisition [Line Items]        
Period of transitional property management services provided after closing on sale of real estate     1 year  
Data Centers | 10 Powered Base Building | Disposal Group, Held-for-sale, Not Discontinued Operations        
Business Acquisition [Line Items]        
Number of properties, classified as held for sale | property       12
Purchase consideration receivable $ 557.0      
Number of properties sold | property 12 12    
Gain (loss) on sale   $ 304.8    
Data Centers | 10 Powered Base Building | Disposal Group, Held-for-sale, Not Discontinued Operations | Assets Held For Sale        
Business Acquisition [Line Items]        
Carrying value of real estate held-for-sale       $ 229.9
Data Centers | 10 Powered Base Building | Disposal Group, Held-for-sale, Not Discontinued Operations | Obligations Associated With Assets Held For Sale        
Business Acquisition [Line Items]        
Carrying value of real estate held-for-sale       $ 2.7
Data Centers | United States        
Business Acquisition [Line Items]        
Number of properties, classified as held for sale | property 12