Organization, Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Operating Partnership's Equity Interest (Parenthetical) (Details) - USD ($) $ in Millions	1 Months Ended	6 Months Ended
	Aug. 31, 2020	Jun. 30, 2021	Apr. 08, 2021
Mervyns II
Variable Interest Entity [Line Items]
Recallable distributions	$ 15.7
Distribution recalled during period		$ 3.8
Mervyns II | Acadia
Variable Interest Entity [Line Items]
Recallable distributions	$ 4.5
Distribution recalled during period		$ 1.1
Fund V
Variable Interest Entity [Line Items]
Investment, maturity date			Aug. 25, 2022