Equity and Capital - Noncontrolling Interests in Operating Partnership (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Class of Stock
Number of units (units)	281,372,310	280,289,726
Percentage of total	97.30%	97.20%
Common stock conversion ratio	1
Digital Realty Trust, L.P.
Class of Stock
Redeemable noncontrolling interests - operating partnership	$ 1,040.6	$ 1,078.9
Common units held by third parties
Class of Stock
Common units held by third parties (units)	5,609,330	6,212,369
Percentage of total	2.00%	2.20%
Incentive units held by employees and directors
Class of Stock
Incentive units held by employees and directors (units)	2,131,941	1,833,898
Percentage of total	0.70%	0.60%
Noncontrolling Interests in Operating Partnership
Class of Stock
Number of units (units)	289,113,581	288,335,993
Percentage of total	100.00%	100.00%