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Debt of the Operating Partnership (Narrative) (Details)
$ in Millions
3 Months Ended
Jan. 16, 2019
USD ($)
Jan. 16, 2019
EUR (€)
Mar. 31, 2019
Mar. 06, 2019
EUR (€)
Debt Instrument [Line Items]        
Leverage ratio     60.00%  
Secured debt leverage ratio, maximum     40.00%  
Interest coverage ratio     1.50  
Total unencumbered assets     150.00%  
Senior Notes | 5.875% notes due 2020 | Digital Realty Trust, L.P.        
Debt Instrument [Line Items]        
Stated interest rate   5.875% 5.875%  
Senior Notes | 2.500% notes due 2026        
Debt Instrument [Line Items]        
Stated interest rate     2.50%  
Senior Notes | 2.500% notes due 2026 | Digital Realty Trust, L.P.        
Debt Instrument [Line Items]        
Stated interest rate   2.50% 2.50%  
Aggregate principal amount   € 850,000,000   € 225,000,000
Net proceeds from offering $ 960.9 € 843,500,000